Android “当条件”检查的自定义lint规则
我正在使用Gson的序列化适配器Android “当条件”检查的自定义lint规则,android,android-studio,kotlin,jetbrains-ide,lint,Android,Android Studio,Kotlin,Jetbrains Ide,Lint,我正在使用Gson的序列化适配器RuntimeTypeAdapterFactory基于disciminator对数据进行序列化。但是,当存在未知的鉴别器(来自API)且未在客户端上定义时,TypeAdapter将为空 在这种情况下,如果我有一个kotlin,当条件检查为: when(fooType){ is fooA -> //blaba is fooB -> //blaba //else or null is not handled } 而fooType为null,它将崩溃
RuntimeTypeAdapterFactory
基于disciminator对数据进行序列化。但是,当存在未知的鉴别器(来自API)且未在客户端上定义时,TypeAdapter
将为空
在这种情况下,如果我有一个kotlin,当条件检查为:
when(fooType){
is fooA -> //blaba
is fooB -> //blaba
//else or null is not handled
}
而fooType
为null
,它将崩溃,因为未处理null
条件。
有没有办法创建一个自定义lint规则(检测器)来检查当条件(java中的instanceof)实现了
else
或null
检查并在Android Studio inspection上注入该检查时的,但是我认为这样的东西(虽然它不是最佳的,你不应该使用它,因为它只显示了想法)可能会起作用
class WhenNullElseMissingDetector : Detector(), Detector.UastScanner {
override fun getApplicableUastTypes(): MutableList<Class<out UElement>> =
mutableListOf(USwitchExpression::class.java)
override fun createUastHandler(context: JavaContext): UElementHandler = WhenNullElseMissingHandler(context)
}
class WhenNullElseMissingHandler(private val context: JavaContext) : UElementHandler() {
override fun visitSwitchExpression(node: USwitchExpression) {
if (node.psi?.javaClass != KtWhenExpression::class.java) {
// returning early here, so it doesn't go false positive on java switches
return
}
var hasNullClause = false
var hasElseClause = false
node.body.expressions.forEach { clause ->
// checking the child's text here just for a example, you should
// probably check if child's class is KtWhenConditionIsPattern,
// KtWhenConditionWithExpression or LeafPsiElement
val clauseText = clause.psi?.firstChild?.text
if ("null" == clauseText) {
hasNullClause = true
} else if ("else" == clauseText) {
hasElseClause = true
}
}
if (!hasElseClause) {
context.report(
WHEN_NULL_OR_ELSE_MISSING, node, context.getLocation(node),
"When expression must include an else case"
)
}
if (!hasNullClause) {
context.report(
WHEN_NULL_OR_ELSE_MISSING, node, context.getLocation(node),
"When expression must include a null case"
)
}
}
}
package com.example.lintchecks
// omit imports
val WHEN_NULL_OR_ELSE_MISSING = Issue.create(
"MY_ISSUE_ID",
"A brief to show in a one line popup",
"More detailed explanation",
Category.CORRECTNESS,
5,
Severity.WARNING,
Implementation(
WhenNullElseMissingDetector::class.java,
Scope.JAVA_FILE_SCOPE
)
)
class MyIssueRegistry : IssueRegistry() {
override val issues: List<Issue>
get() = listOf(WHEN_NULL_OR_ELSE_MISSING)
}
jar {
manifest {
attributes("Lint-Registry-v2": "com.example.lintchecks.MyIssueRegistry")
}
}