/*
* 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.util;
import com.intellij.openapi.components.ComponentManager;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.PossiblyDumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.lang.ref.WeakReference;
/**
* @author Sergey Evdokimov
*/
public class DisposeAwareRunnable extends WeakReference<Object> implements Runnable {
protected final Runnable myDelegate;
public static Runnable create(@NotNull Runnable delegate, @Nullable PsiElement disposable) {
return create(delegate, (Object)disposable);
}
public static Runnable create(@NotNull Runnable delegate, @Nullable Project disposable) {
return create(delegate, (Object)disposable);
}
public static Runnable create(@NotNull Runnable delegate, @Nullable Module disposable) {
return create(delegate, (Object)disposable);
}
private static Runnable create(@NotNull Runnable delegate, @Nullable Object disposable) {
if (disposable == null) {
return delegate;
}
if (delegate instanceof DumbAware) {
return new DumbAwareRunnable(delegate, disposable);
}
if (delegate instanceof PossiblyDumbAware) {
return new PossiblyDumbAwareRunnable(delegate, disposable);
}
return new DisposeAwareRunnable(delegate, disposable);
}
private DisposeAwareRunnable(@NotNull Runnable delegate, @NotNull Object disposable) {
super(disposable);
myDelegate = delegate;
assert disposable instanceof PsiElement || disposable instanceof ComponentManager : "Unknown type of "+disposable;
}
@Override
public void run() {
Object res = get();
if (res == null) return;
if (res instanceof PsiElement) {
if (!((PsiElement)res).isValid()) return;
}
else if (res instanceof ComponentManager) {
if (((ComponentManager)res).isDisposed()) return;
}
myDelegate.run();
}
private static class DumbAwareRunnable extends DisposeAwareRunnable implements DumbAware {
DumbAwareRunnable(Runnable delegate, Object disposable) {
super(delegate, disposable);
}
}
private static class PossiblyDumbAwareRunnable extends DisposeAwareRunnable implements PossiblyDumbAware {
PossiblyDumbAwareRunnable(Runnable delegate, Object disposable) {
super(delegate, disposable);
}
@Override
public boolean isDumbAware() {
return ((PossiblyDumbAware)myDelegate).isDumbAware();
}
}
}