InspectionSuppressor only receives elements of type KtFile

Added a breakpoint to spot where the calls to my implementation come from, seems they're all from:

isSuppressedFor:12, MyInspectionSuppressor (my.full.ClassName)
isSuppressed:154, InspectionProfileEntry (com.intellij.codeInspection)
isSuppressedFor:69, InspectionProfileEntry (com.intellij.codeInspection)
inspectionResultSuppressed:179, SuppressionUtil (com.intellij.codeInspection)
inspectionResultSuppressed:175, SuppressionUtil (com.intellij.codeInspection)
getInspectionTools:700, LocalInspectionsPass (com.intellij.codeInsight.daemon.impl)
getInspectionTools:93, WholeFileLocalInspectionsPassFactory$2 (com.intellij.codeInsight.daemon.impl)
collectInformationWithProgress:115, LocalInspectionsPass (com.intellij.codeInsight.daemon.impl)
doCollectInformation:84, ProgressableTextEditorHighlightingPass (com.intellij.codeInsight.daemon.impl)
collectInformation:69, TextEditorHighlightingPass (com.intellij.codeHighlighting)
lambda$null$1:423, PassExecutorService$ScheduledPass (com.intellij.codeInsight.daemon.impl)
run:-1, 1023706571 (com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$$Lambda$1769)
tryRunReadAction:1168, ApplicationImpl (com.intellij.openapi.application.impl)
lambda$doRun$2:416, PassExecutorService$ScheduledPass (com.intellij.codeInsight.daemon.impl)
run:-1, 1017753594 (com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$$Lambda$1768)
registerIndicatorAndRun:582, CoreProgressManager (com.intellij.openapi.progress.impl)
executeProcessUnderProgress:532, CoreProgressManager (com.intellij.openapi.progress.impl)
executeProcessUnderProgress:87, ProgressManagerImpl (com.intellij.openapi.progress.impl)
doRun:415, PassExecutorService$ScheduledPass (com.intellij.codeInsight.daemon.impl)
lambda$run$0:391, PassExecutorService$ScheduledPass (com.intellij.codeInsight.daemon.impl)
run:-1, 78319482 (com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$$Lambda$1763)
executeByImpatientReader:147, ReadMostlyRWLock (com.intellij.openapi.application.impl)
executeByImpatientReader:222, ApplicationImpl (com.intellij.openapi.application.impl)
run:389, PassExecutorService$ScheduledPass (com.intellij.codeInsight.daemon.impl)
exec:161, JobLauncherImpl$VoidForkJoinTask$1 (com.intellij.concurrency)
doExec:289, ForkJoinTask (java.util.concurrent)
runTask:1056, ForkJoinPool$WorkQueue (java.util.concurrent)
runWorker:1692, ForkJoinPool (java.util.concurrent)
run:157, ForkJoinWorkerThread (java.util.concurrent)

Please try adding 'order="first"' to inspectionSuppressor registration in your plugin.xml

This did not seem to make any difference unfortunately.

My plugin.xml looks as follows:

<idea-plugin>
  ...
  <idea-version since-build="173.0"/>

  <depends>org.jetbrains.kotlin</depends>

  <extensions defaultExtensionNs="com.intellij">
    <lang.inspectionSuppressor language="kotlin" implementationClass="MySuppressor" order="first" />
  </extensions>
</idea-plugin>

My implementation:

import com.intellij.codeInspection.InspectionSuppressor
import com.intellij.codeInspection.SuppressQuickFix
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.psi.KtFile

class MySuppressor : InspectionSuppressor {

    override fun isSuppressedFor(element: PsiElement, toolId: String): Boolean {
        if (element !is KtFile) {
            throw RuntimeException("el: $element")
        }
        return false
    }

    override fun getSuppressActions(p0: PsiElement?, p1: String): Array<SuppressQuickFix> = SuppressQuickFix.EMPTY_ARRAY

}

// Test file
class Foo {

    constructor() {
    } 

}

Does any *enabled* inspection produce problems on given code snippet for you?

Hey Dmitry, sorry for the late reply. Just got back to this again.

Yes, inspection providers outside my plugin do, for instance the "Convert to primary constructor" one.

I changed the suppressor's language to UAST in plugin.xml, and receive all sorts of PsiElements from Java files, and was able to make it all work with Java.

Kotlin doesn't work however, as I still only get KtFile!

class UnusedConstructorInspectionSuppressor : InspectionSuppressor {

    override fun isSuppressedFor(element: PsiElement, toolId: String): Boolean {
        if (element !is PsiIdentifier) {
            return false
        }
        if (toolId != UNUSED_TOOL_ID) {
            return false
        }
        return MyPsiUtil.isExpectedConstructor(element)
    }

    override fun getSuppressActions(p0: PsiElement?, p1: String): Array<SuppressQuickFix> {
        return SuppressQuickFix.EMPTY_ARRAY
    }

    companion object {
        private const val UNUSED_TOOL_ID = "unused"
    }

}