Refactoring: replace condition with function

compiler/frontend/src/org/jetbrains/kotlin/resolve/diagnostics/DiagnosticsElementsCache.java

@@ -17,10 +17,10 @@
 package org.jetbrains.kotlin.resolve.diagnostics;
 
 import com.intellij.openapi.util.AtomicNotNullLazyValue;
-import com.intellij.openapi.util.Condition;
 import com.intellij.psi.PsiElement;
 import com.intellij.util.containers.ConcurrentMultiMap;
 import com.intellij.util.containers.MultiMap;
+import kotlin.jvm.functions.Function1;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.diagnostics.Diagnostic;
 
@@ -28,7 +28,7 @@ import java.util.Collection;
 
 public class DiagnosticsElementsCache {
     private final Diagnostics diagnostics;
-    private final Condition<Diagnostic> filter;
+    private final Function1<Diagnostic, Boolean> filter;
 
     private final AtomicNotNullLazyValue<MultiMap<PsiElement, Diagnostic>> elementToDiagnostic = new AtomicNotNullLazyValue<MultiMap<PsiElement, Diagnostic>>() {
         @NotNull
@@ -38,7 +38,7 @@ public class DiagnosticsElementsCache {
         }
     };
 
-    public DiagnosticsElementsCache(Diagnostics diagnostics, Condition<Diagnostic> filter) {
+    public DiagnosticsElementsCache(Diagnostics diagnostics, Function1<Diagnostic, Boolean> filter) {
         this.diagnostics = diagnostics;
         this.filter = filter;
     }
@@ -48,10 +48,10 @@ public class DiagnosticsElementsCache {
         return elementToDiagnostic.getValue().get(psiElement);
     }
 
-    private static MultiMap<PsiElement, Diagnostic> buildElementToDiagnosticCache(Diagnostics diagnostics, Condition<Diagnostic> filter) {
+    private static MultiMap<PsiElement, Diagnostic> buildElementToDiagnosticCache(Diagnostics diagnostics, Function1<Diagnostic, Boolean> filter) {
         MultiMap<PsiElement, Diagnostic> elementToDiagnostic = new ConcurrentMultiMap<PsiElement, Diagnostic>();
         for (Diagnostic diagnostic : diagnostics) {
-            if (filter.value(diagnostic)) {
+            if (filter.invoke(diagnostic)) {
                 elementToDiagnostic.putValue(diagnostic.getPsiElement(), diagnostic);
             }
         }

compiler/frontend/src/org/jetbrains/kotlin/resolve/diagnostics/DiagnosticsWithSuppression.java

@@ -24,8 +24,9 @@ import com.intellij.openapi.util.ModificationTracker;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiFile;
 import com.intellij.util.containers.ConcurrentWeakValueHashMap;
-import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.containers.FilteringIterator;
+import kotlin.CollectionsKt;
+import kotlin.jvm.functions.Function1;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
@@ -70,12 +71,13 @@ public class DiagnosticsWithSuppression implements Diagnostics {
     // The cache is weak: we're OK with losing it
     private final Map<KtAnnotated, Suppressor> suppressors = new ConcurrentWeakValueHashMap<KtAnnotated, Suppressor>();
 
-    private final Condition<Diagnostic> filter = new Condition<Diagnostic>() {
+    private final Function1<Diagnostic, Boolean> filter = new Function1<Diagnostic, Boolean>() {
         @Override
-        public boolean value(Diagnostic diagnostic) {
+        public Boolean invoke(Diagnostic diagnostic) {
             return !isSuppressed(diagnostic);
         }
     };
+
     private final DiagnosticsElementsCache elementsCache = new DiagnosticsElementsCache(this, filter);
 
     public DiagnosticsWithSuppression(@NotNull BindingContext context, @NotNull Collection<Diagnostic> diagnostics) {
@@ -92,13 +94,18 @@ public class DiagnosticsWithSuppression implements Diagnostics {
     @NotNull
     @Override
     public Iterator<Diagnostic> iterator() {
-        return new FilteringIterator<Diagnostic, Diagnostic>(diagnostics.iterator(), filter);
+        return new FilteringIterator<Diagnostic, Diagnostic>(diagnostics.iterator(), new Condition<Diagnostic>() {
+            @Override
+            public boolean value(Diagnostic diagnostic) {
+                return filter.invoke(diagnostic);
+            }
+        });
     }
 
     @NotNull
     @Override
     public Collection<Diagnostic> all() {
-        return ContainerUtil.filter(diagnostics, filter);
+        return CollectionsKt.filter(diagnostics, filter);
     }
 
     @NotNull

compiler/frontend/src/org/jetbrains/kotlin/resolve/diagnostics/SimpleDiagnostics.kt

@@ -26,7 +26,7 @@ public class SimpleDiagnostics(diagnostics: Collection<Diagnostic>) : Diagnostic
     private val diagnostics = ArrayList(diagnostics)
 
     @Suppress("UNCHECKED_CAST")
-    private val elementsCache = DiagnosticsElementsCache(this, Condition.TRUE as Condition<Diagnostic>?)
+    private val elementsCache = DiagnosticsElementsCache(this, { true })
 
     override fun all() = diagnostics