/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.aspectj.org.eclipse.jdt.internal.core;
import java.util.ArrayList;
import org.aspectj.org.eclipse.jdt.core.IBuffer;
import org.aspectj.org.eclipse.jdt.internal.core.util.LRUCache;
/**
* An LRU cache of <code>IBuffers</code>.
*/
public class BufferCache extends OverflowingLRUCache {
private ThreadLocal buffersToClose = new ThreadLocal();
/**
* Constructs a new buffer cache of the given size.
*/
public BufferCache(int size) {
super(size);
}
/**
* Constructs a new buffer cache of the given size.
*/
public BufferCache(int size, int overflow) {
super(size, overflow);
}
/**
* Returns true if the buffer is successfully closed and
* removed from the cache, otherwise false.
*
* <p>NOTE: this triggers an external removal of this buffer
* by closing the buffer.
*/
protected boolean close(LRUCacheEntry entry) {
IBuffer buffer= (IBuffer) entry._fValue;
// prevent buffer that have unsaved changes or working copy buffer to be removed
// see https://bugs.eclipse.org/bugs/show_bug.cgi?id=39311
if (!((Openable)buffer.getOwner()).canBufferBeRemovedFromCache(buffer)) {
return false;
} else {
ArrayList buffers = (ArrayList) this.buffersToClose.get();
if (buffers == null) {
buffers = new ArrayList();
this.buffersToClose.set(buffers);
}
buffers.add(buffer);
return true;
}
}
void closeBuffers() {
ArrayList buffers = (ArrayList) this.buffersToClose.get();
if (buffers == null)
return;
this.buffersToClose.set(null);
for (int i = 0, length = buffers.size(); i < length; i++) {
((IBuffer) buffers.get(i)).close();
}
}
/**
* Returns a new instance of the reciever.
*/
protected LRUCache newInstance(int size, int overflow) {
return new BufferCache(size, overflow);
}
}