| /* |
| * 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 |
| */ |
| 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); |
| } |
| } |