/*
* Copyright 2000-2014 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.ide.projectView.impl.nodes;
import com.intellij.ide.util.treeView.TreeAnchorizer;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.ReadAction;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.SmartPointerManager;
import com.intellij.psi.SmartPsiElementPointer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author peter
*/
public class PsiTreeAnchorizer extends TreeAnchorizer {
@Override
public Object createAnchor(Object element) {
if (element instanceof PsiElement) {
PsiElement psi = (PsiElement)element;
return ReadAction.compute(() -> {
if (!psi.isValid()) return psi;
return new SmartPointerWrapper(SmartPointerManager.getInstance(psi.getProject()).createSmartPsiElementPointer(psi));
});
}
return super.createAnchor(element);
}
@Override
@Nullable
public Object retrieveElement(final Object pointer) {
if (pointer instanceof SmartPointerWrapper) {
return ReadAction.compute(() -> ((SmartPointerWrapper)pointer).myPointer.getElement());
}
return super.retrieveElement(pointer);
}
@Override
public void freeAnchor(final Object element) {
if (element instanceof SmartPointerWrapper) {
ApplicationManager.getApplication().runReadAction(() -> {
SmartPsiElementPointer pointer = ((SmartPointerWrapper)element).myPointer;
Project project = pointer.getProject();
if (!project.isDisposed()) {
SmartPointerManager.getInstance(project).removePointer(pointer);
}
});
}
}
private static class SmartPointerWrapper {
private final SmartPsiElementPointer myPointer;
private SmartPointerWrapper(@NotNull SmartPsiElementPointer pointer) {
myPointer = pointer;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof SmartPointerWrapper)) return false;
SmartPointerWrapper wrapper = (SmartPointerWrapper)o;
if (!myPointer.equals(wrapper.myPointer)) return false;
return true;
}
@Override
public int hashCode() {
return myPointer.hashCode();
}
}
}