/*******************************************************************************
* Copyright © 2000, 2013 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.eclipse.edt.ide.core.internal.model;
import org.eclipse.edt.ide.core.internal.model.util.LRUCache;
import org.eclipse.edt.ide.core.model.EGLModelException;
import org.eclipse.edt.ide.core.model.IOpenable;
/**
* An LRU cache of <code>EGLElements</code>.
*/
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.
*
* <p>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 {
// TODO handle zip/jar later
/*
// 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();
}
*/
element.close();
return true;
}
} catch (EGLModelException npe) {
return false;
}
}
/**
* Returns a new instance of the reciever.
*/
protected LRUCache newInstance(int size, int overflow) {
return new ElementCache(size, overflow);
}
}