/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package net.sourceforge.phpdt.internal.core;
import net.sourceforge.phpdt.core.IOpenable;
import net.sourceforge.phpdt.core.JavaModelException;
import net.sourceforge.phpdt.internal.core.util.LRUCache;
/**
* An LRU cache of JavaElements
.
*/
public class ElementCache extends OverflowingLRUCache {
/**
* Constructs a new element cache of the given size.
*/
public ElementCache(int size) {
super(size);
}
/**
* Constructs a new element cache of the given size.
*/
public ElementCache(int size, int overflow) {
super(size, overflow);
}
/**
* Returns true if the element is successfully closed and
* removed from the cache, otherwise false.
*
*
NOTE: this triggers an external removal of this element * by closing the element. */ protected boolean close(LRUCacheEntry entry) { IOpenable element = (IOpenable) entry._fKey; try { if (element.hasUnsavedChanges()) { return false; } else { // We must close an entire JarPackageFragmentRoot at once. // if (element instanceof JarPackageFragment) { // JarPackageFragment packageFragment= (JarPackageFragment) element; // JarPackageFragmentRoot root = (JarPackageFragmentRoot) packageFragment.getParent(); // root.close(); // } else { element.close(); // } return true; } } catch (JavaModelException npe) { return false; } } /** * Returns a new instance of the reciever. */ protected LRUCache newInstance(int size, int overflow) { return new ElementCache(size, overflow); } }