net.sf.ehcache.store.DefaultElementValueComparator Maven / Gradle / Ivy
/**
* Copyright 2003-2010 Terracotta, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache.store;
import net.sf.ehcache.Element;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.store.compound.ReadWriteCopyStrategy;
import java.util.Arrays;
/**
* @author Ludovic Orban
*/
public class DefaultElementValueComparator implements ElementValueComparator {
private final ReadWriteCopyStrategy readWriteCopyStrategy;
private final boolean doNoCopyForRead;
/**
* Constructor
*
* @param cacheConfiguration the cache configuration
*/
public DefaultElementValueComparator(CacheConfiguration cacheConfiguration) {
this.readWriteCopyStrategy = cacheConfiguration.getCopyStrategy();
// only do a copy for read before comparing if both copy on read and copy on write are enabled
this.doNoCopyForRead = !(cacheConfiguration.isCopyOnRead() && cacheConfiguration.isCopyOnWrite());
}
/**
* {@inheritDoc}
*/
public boolean equals(Element e1, Element e2) {
if (e1 == null && e2 == null) {
return true;
} else if (e1 != null && e1.equals(e2)) {
if (e1.getObjectValue() == null) {
return e2.getObjectValue() == null;
} else {
return compareValues(copyForReadIfNeeded(e1).getObjectValue(), copyForReadIfNeeded(e2).getObjectValue());
}
} else {
return false;
}
}
private static boolean compareValues(Object objectValue1, Object objectValue2) {
if (objectValue1 != null && objectValue2 != null && objectValue1.getClass().isArray() && objectValue2.getClass().isArray()) {
return Arrays.deepEquals(new Object[] {objectValue1}, new Object[] {objectValue2});
} else {
if (objectValue1 == null) {
return objectValue2 == null;
} else {
return objectValue1.equals(objectValue2);
}
}
}
private Element copyForReadIfNeeded(Element element) {
if (readWriteCopyStrategy == null || doNoCopyForRead) {
return element;
}
return readWriteCopyStrategy.copyForRead(element);
}
}