/*
* 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.openjpa.persistence;
import java.util.Collections;
import javax.persistence.Query;
import org.apache.openjpa.datacache.DelegatingQueryCache;
import org.apache.openjpa.datacache.QueryCache;
import org.apache.openjpa.datacache.QueryKey;
import org.apache.openjpa.datacache.TypesChangedEvent;
/**
* Implements Query result cache via delegation to QueryCache.
*
* @author Abe White
* @since 0.4.1
* @nojavadoc
*/
public class QueryResultCacheImpl
implements QueryResultCache {
private final DelegatingQueryCache _cache;
/**
* Constructor; supply delegate.
*/
public QueryResultCacheImpl(QueryCache cache) {
_cache = new DelegatingQueryCache(cache,
PersistenceExceptions.TRANSLATOR);
}
/**
* Delegate.
*/
public QueryCache getDelegate() {
return _cache.getDelegate();
}
public void pin(Query q) {
if (_cache.getDelegate() != null)
_cache.pin(toQueryKey(q));
}
public void unpin(Query q) {
if (_cache.getDelegate() != null)
_cache.unpin(toQueryKey(q));
}
public void evict(Query q) {
if (_cache.getDelegate() != null)
_cache.remove(toQueryKey(q));
}
public void evictAll() {
_cache.clear();
}
public void evictAll(Class cls) {
_cache.onTypesChanged(new TypesChangedEvent(this,
Collections.singleton(cls)));
}
/**
* Return a cache key for the given query.
*/
private QueryKey toQueryKey(Query q) {
QueryImpl impl = (QueryImpl) q;
if (impl.hasPositionalParameters())
return QueryKey.newInstance(impl.getDelegate(),
impl.getPositionalParameters());
return QueryKey.newInstance(impl.getDelegate(),
impl.getNamedParameters());
}
public int hashCode() {
return (_cache == null) ? 0 : _cache.hashCode();
}
public boolean equals(Object other) {
if (other == this)
return true;
if ((other == null) || (other.getClass() != this.getClass()))
return false;
if (_cache == null)
return false;
return _cache.equals(((QueryResultCacheImpl) other)._cache);
}
}