尝试使用Java&；Xpath更新XML文档中任何选定节点的值
我开发了GUI工具，它将XML文档显示为可编辑的JTree，用户可以在JTree中选择一个节点，并尝试更改XML文档中的实际节点值 我遇到的问题是构造正确的Xpath查询来尝试实际的更新 以下是JTree的GUI，显示选择了哪个元素并应进行编辑： 这是一个非常大的XMl，因此这里是XMl的折叠片段： 更新（忽略尝试1和2，解决第一个问题，转到尝试3和4）尝试使用Java&；Xpath更新XML文档中任何选定节点的值,java,xml,xpath,Java,Xml,Xpath,我开发了GUI工具，它将XML文档显示为可编辑的JTree，用户可以在JTree中选择一个节点，并尝试更改XML文档中的实际节点值 我遇到的问题是构造正确的Xpath查询来尝试实际的更新 以下是JTree的GUI，显示选择了哪个元素并应进行编辑： 这是一个非常大的XMl，因此这里是XMl的折叠片段： 更新（忽略尝试1和2，解决第一个问题，转到尝试3和4） factory.setNamespaceAware(false); doc = dBuilder.parse(xmlFile); if (
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml，Ingest，属性映射，标识符，IdentifiedExyz]//摄取/Property\u映射/identifier/text（）public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
[#document:null]factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
NamedNodeMap NamedNodeMap=doc.getAttributes（）返回NULL
然而，Node firstChild=doc.getFirstChild（）
实际上返回了有效的元素
我将firstChild传递给xpath.evaluate（sb.toString（），firstChild，XPathConstants.NODE）但再次未找到所需的节点
输出（再次无法找到节点）：
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//for loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end for loop
sb.append("text()");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath
XPath xpath = XPathFactory.newInstance().newXPath();
//compile query
NodeList nodes = (NodeList) xpath.compile(sb.toString()).evaluate(doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest.xml, Ingest, Property_Maps, identifier, identifieXYZ]
Constructed XPath Query://Ingest/Property_Maps/identifier/text()
Jan 26, 2021 2:04:16 PM com.xyz.XmlToXsdValidator.Views.EditXmlTreeNodeDialogJFrame jButtonOkEditActionPerformed
SEVERE: null
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:368)
javax.xml.transform.TransformerException: Unable to evaluate expression using this context
public void updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
// Locate the node(s) with xpath
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
sb.append("//");
} else {
sb.append(pathTockens[i].trim());
sb.append("/");
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
int lastIndexOfPathChar = sb.lastIndexOf("/");
sb.replace(lastIndexOfPathChar, lastIndexOfPathChar + 1, "");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//Make the change on the selected nodes
for (int idx = 0; idx < nodes.getLength(); idx++) {
Node value = nodes.item(idx).getAttributes().getNamedItem("value");
String val = value.getNodeValue();
value.setNodeValue(val.replaceAll(oldValue, newValue));
}
SingleTask.currentTask.setDoc(doc);
}
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.w3c.dom.Document;
/**
*
* References:https://www.kdgregory.com/index.php?page=xml.xpath
*/
//custom NamespaceContext clss implementation
public class UniversalNamespaceResolver implements NamespaceContext
{
private String _prefix = "ns";
private String _namespaceUri=null;
private List<String> _prefixes = Arrays.asList(_prefix);
public UniversalNamespaceResolver(String namespaceResolver)
{
_namespaceUri = namespaceResolver;
}
@Override
@SuppressWarnings("rawtypes")
public Iterator getPrefixes(String uri)
{
if (uri == null)
throw new IllegalArgumentException("UniversalNamespaceResolver getPrefixes() URI may not be null");
else if (_namespaceUri.equals(uri))
return _prefixes.iterator();
else if (XMLConstants.XML_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
else
return Collections.emptyList().iterator();
}
@Override
public String getPrefix(String uri)
{
if (uri == null)
throw new IllegalArgumentException("nsURI may not be null");
else if (_namespaceUri.equals(uri))
return _prefix;
else if (XMLConstants.XML_NS_URI.equals(uri))
return XMLConstants.XML_NS_PREFIX;
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri))
return XMLConstants.XMLNS_ATTRIBUTE;
else
return null;
}
@Override
public String getNamespaceURI(String prefix)
{
if (prefix == null)
throw new IllegalArgumentException("prefix may not be null");
else if (_prefix.equals(prefix))
return _namespaceUri;
else if (XMLConstants.XML_NS_PREFIX.equals(prefix))
return XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
else
return null;
}
}
public boolean updateXmlData(JTree jTree, org.w3c.dom.Document doc, TreeNode parentNode, String oldValue, String newValue) throws XPathExpressionException {
System.out.println("Selected path=" + jTree.getSelectionPath().toString());
boolean changed = false;
// Locate the node(s) with xpath
String[] pathTockens = jTree.getSelectionPath().toString().split(",");
StringBuilder sb = new StringBuilder();
//loop to construct xpath query
for (int i = 0; i < pathTockens.length - 1; i++) {
if (i == 0) {
//do nothing
} else if (i == 1) {
sb.append("/" + pathTockens[i].trim());
} else if (i > 1 && i != pathTockens.length - 1) {
sb.append("/" + pathTockens[i].trim());
} else {
//sb.append("/" + pathTockens[i].trim());
}
}//end loop
sb.append("[text()=");
sb.append("'");
sb.append(oldValue);
sb.append("']");
System.out.println("Constructed XPath Query:" + sb.toString());
//new xpath instance
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
//WITHOUT CUSTOM NAMESPACE CONTEXT xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc, XPathConstants.NODESET);
//start for
Node node;
String val = null;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
//set the new updated xml doc
SingleTask.currentTask.setDoc(doc);
return changed;
}
Element='<identifier xmlns="http://pds.nasa.gov/pds4/pds/v1">identifier1</identifier>'
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
Selected path=[C:\Users\xyz\Documents\XsdToXmlFiles\sampleIngest_LDD.xml, Ingest_LDD, name, name1]
Constructed XPath Query:/Ingest_LDD/name[text()='name1']
Error changing value!
尝试#8（名称空间感知错误）
factory.setNamespaceAware(false);
doc = dBuilder.parse(xmlFile);
if (doc!=null)
{
//***NOTE program comes meaning doc is NOT null, however inspecting it shows [#document: null]
doc.getDocumentElement().normalize();
}
//COMMENTED OUT , SINCE NAMESPACE AWARE FALSE xpath.setNamespaceContext(new UniversalNamespaceResolver(SingleTask.currentTask.getXsdFile().getXsdNameSpace()));
Node node = (Node) xpath.evaluate(sb.toString(), doc, XPathConstants.NODE);
if (node!=null)
{
// See https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent(newValue);
SingleTask.currentTask.setDoc(doc);
}
我还尝试将doc.getChildNodes（）
传递到xpath.evaluate（）
而不是doc
对象作为最终的绝望尝试，请参见下面的代码片段
if (doc != null) {
NodeList nodes = (NodeList) xpath.evaluate(sb.toString(), doc.getChildNodes(), XPathConstants.NODESET);
String val = null;
Node node;
for (int idx = 0; idx < nodes.getLength(); idx++) {
if (nodes.item(idx).getAttributes() != null) {
node = nodes.item(idx).getAttributes().getNamedItem("value");
if (node != null) {
val = node.getNodeValue();
node.setNodeValue(val.replaceAll(oldValue, newValue));
changed = true;
break;
}//end if node is found
}
}//end for
}
对于联机执行的测试，XML文件似乎包含名称空间信息
考虑到这些信息，您的两个XPath计算示例可能都能工作，或者不能工作，这取决于几件事
例如，如果您使用的是非名称空间感知（默认）DocumentBuilderFactory
，并且在XPath表达式中没有提供任何名称空间信息，那么您可能可以使用尝试4，XPath计算就足够了
但是，如果应用相反的条件，即您正在使用一个名称空间感知的DocumentBuilderFactory
，那么尝试#3中的XPath计算也就足够了：
DocumentBuilderFactory f=DocumentBuilderFactory.newInstance（）；
f、 setNamespaceAware（true）；
您还可以在XPath表达式中提供名称空间信息和方便的NamespaceContext
实现。请参阅相关的SO问题和IBM文章
请注意，您不需要在XML文件和XPath表达式中提供相同的名称空间前缀，唯一的要求是XML中的名称空间感知（XPath始终是名称空间感知的）
在这种情况下，我认为两种方法都可以应用
在任何情况下，我认为问题可能与您处理实际文本替换的方式有关：您正在查找具有值
属性的节点，并且查看关联的this属性不存在
请考虑下面的方法：
//您可以在两次尝试后到达这里#3和#4
Node Node=（Node）xpath.evaluate（sb.toString（），doc，XPathConstants.Node）；
布尔值已更改=节点！=无效的
如果（更改）{
//看https://docs.oracle.com/javase/9/docs/api/org/w3c/dom/Node.html#setTextContent-java.lang.String-
node.setTextContent（newValue）；
SingleTask.currentTask.setDoc（doc）；
}
回报发生变化；
此代码假定所选节点是唯一的，可以正常工作
尽管可能不同，但请注意，如果为XML中的重复元素定义相同的值，那么从JTree
模型构建XPath选择器的方式可能会提供重复。例如，在屏幕截图中考虑元素<代码> ExulalIdIsPrimyType映射。< /P>
为了避免这种情况，在构造XPath选择器时可以采用不同的方法
您的代码片段还不清楚，但您可能正在使用作为基本JTree
节点类型。如果是这种情况，您可以将所需的任意信息与每个节点关联
例如，考虑创建一个包含两个字段的简单POJO，节点表示的元素的名称，以及某种唯一的生成id，让我们将其命名为uid
或uuid
，以避免与id
属性混淆，后者很可能包含在原始XML文档中
此uid
应与每个节点关联。也许您可以利用JTree
创建过程，在处理XML文件的每个节点时，也可以包括这个属性，例如使用UUID
类生成的属性
或者，您可以在表示之前对原始XML文档应用XSLT转换：
通过这些更改，您的XPath查询应该如下所示：
/ns:Ingest_LDD[@uid='w1ab1']/ns:Property_Maps[@uid='w1ab1a']/ns:identifier[@uid='w1ab1aq']
当然，有必要从JTr的所选路径修改用于构造此表达式的代码