/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cocoon.pipeline.caching;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.cocoon.pipeline.util.MurmurHashCodeBuilder;
import org.apache.cocoon.pipeline.util.StringRepresentation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class CompoundCacheKey extends AbstractCacheKey {
private static final long serialVersionUID = 1L;
private final Log logger = LogFactory.getLog(this.getClass());
private final List<CacheKey> cacheKeys = new LinkedList<CacheKey>();
public void addCacheKey(CacheKey cacheKey) {
this.cacheKeys.add(cacheKey);
}
@Override
public boolean equals(Object obj) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Comparing two cache keys: ");
this.logger.debug(" this=" + this);
this.logger.debug(" other=" + obj);
}
if (!(obj instanceof CompoundCacheKey)) {
return false;
}
CompoundCacheKey other = (CompoundCacheKey) obj;
if (this.cacheKeys.size() != other.cacheKeys.size()) {
return false;
}
Iterator<CacheKey> myIterator = this.cacheKeys.iterator();
Iterator<CacheKey> otherIterator = other.cacheKeys.iterator();
while (myIterator.hasNext()) {
CacheKey myCacheKey = myIterator.next();
CacheKey otherCacheKey = otherIterator.next();
if (myCacheKey == null || !myCacheKey.equals(otherCacheKey)) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Cache keys are not equal: ");
this.logger.debug(" myCacheKey=" + myCacheKey);
this.logger.debug(" otherCacheKey=" + otherCacheKey);
}
return false;
}
}
return true;
}
@Override
public int hashCode() {
MurmurHashCodeBuilder murmurHashCodeBuilder = new MurmurHashCodeBuilder();
for (CacheKey cacheKey : this.cacheKeys) {
murmurHashCodeBuilder.append(cacheKey.hashCode());
}
return murmurHashCodeBuilder.toHashCode();
}
/**
* {@inheritDoc}
*
* @see org.apache.cocoon.pipeline.caching.CacheKey#isValid(org.apache.cocoon.pipeline.caching.CacheKey)
*/
public boolean isValid(CacheKey cacheKey) {
if (!this.equals(cacheKey)) {
return false;
}
CompoundCacheKey other = (CompoundCacheKey) cacheKey;
Iterator<CacheKey> myIterator = this.cacheKeys.iterator();
Iterator<CacheKey> otherIterator = other.cacheKeys.iterator();
while (myIterator.hasNext()) {
CacheKey myCacheKey = myIterator.next();
CacheKey otherCacheKey = otherIterator.next();
if (!myCacheKey.isValid(otherCacheKey)) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Cache key is not valid: ");
this.logger.debug(" myCacheKey=" + myCacheKey);
this.logger.debug(" otherCacheKey=" + otherCacheKey);
}
return false;
}
}
return true;
}
public long getLastModified() {
long lastModified = 0;
for (CacheKey eachKey : this.cacheKeys) {
long eachLastModified = eachKey.getLastModified();
if (eachLastModified == -1) {
return -1;
}
if (eachLastModified > lastModified) {
lastModified = eachLastModified;
continue;
}
}
return lastModified;
}
@Override
public String toString() {
return StringRepresentation.buildString(this, "key=" + this.cacheKeys);
}
}