IDEA-97504 Make source location functionality pluggable

java/java-psi-impl/src/com/intellij/psi/impl/compiled/ClsCustomNavigationPolicyEx.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.psi.impl.compiled;
+
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * @author peter
+ */
+public abstract class ClsCustomNavigationPolicyEx implements ClsCustomNavigationPolicy {
+  @Nullable
+  @Override
+  public PsiElement getNavigationElement(@NotNull ClsClassImpl clsClass) {
+    return null;
+  }
+
+  @Nullable
+  @Override
+  public PsiElement getNavigationElement(@NotNull ClsMethodImpl clsMethod) {
+    return null;
+  }
+
+  @Nullable
+  @Override
+  public PsiElement getNavigationElement(@NotNull ClsFieldImpl clsField) {
+    return null;
+  }
+
+  @Nullable
+  public PsiFile getFileNavigationElement(@NotNull ClsFileImpl file) {
+    return null;
+  }
+}

java/java-psi-impl/src/com/intellij/psi/impl/compiled/ClsFileImpl.java

@@ -256,6 +256,15 @@ public class ClsFileImpl extends ClsRepositoryPsiElement<PsiClassHolderFileStub>
   @Override
   @NotNull
   public PsiElement getNavigationElement() {
+    for (ClsCustomNavigationPolicy customNavigationPolicy : Extensions.getExtensions(ClsCustomNavigationPolicy.EP_NAME)) {
+      if (customNavigationPolicy instanceof ClsCustomNavigationPolicyEx) {
+        PsiFile navigationElement = ((ClsCustomNavigationPolicyEx)customNavigationPolicy).getFileNavigationElement(this);
+        if (navigationElement != null) {
+          return navigationElement;
+        }
+      }
+    }
+
     return JavaPsiImplementationHelper.getInstance(getProject()).getClsFileNavigationElement(this);
   }