model/org/eclipse/jdt/internal/core/BufferCache.java

package org.eclipse.jdt.internal.core;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.IOpenable;
import org.eclipse.jdt.internal.core.util.LRUCache;

/**
 * An LRU cache of <code>IBuffers</code>.
 */
public class BufferCache extends OverflowingLRUCache {
/**
 * 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;
	synchronized (buffer) {
		if (buffer.hasUnsavedChanges()) {
			return false;
		} else {
			buffer.close();
			return true;
		}
	}
}
	/**
	 * Returns a new instance of the reciever.
	 */
	protected LRUCache newInstance(int size, int overflow) {
		return new BufferCache(size, overflow);
	}
}