/*******************************************************************************
* Copyright (c) 2002, 2008 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:
* Rational Software - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.model;
import org.eclipse.cdt.core.model.CModelException;
import org.eclipse.cdt.core.model.IOpenable;
import org.eclipse.cdt.internal.core.util.OverflowingLRUCache;
/**
* An LRU cache of <code>CElements</code>.
*
* This class is similar to the JDT ElementCache class.
*/
public class ElementCache<T> extends OverflowingLRUCache<IOpenable, T> {
/**
* 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.
*/
@Override
protected boolean close(LRUCacheEntry<IOpenable, T> entry) {
IOpenable element = entry._fKey;
try {
if (element.hasUnsavedChanges()) {
return false;
}
element.close();
return true;
} catch (CModelException npe) {
return false;
}
}
/**
* Returns a new instance of the receiver.
*/
@Override
protected OverflowingLRUCache<IOpenable, T> newInstance(int size, int overflow) {
return new ElementCache<T>(size, overflow);
}
}