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/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.amazon.carbonado.qe;
import com.amazon.carbonado.IsolationLevel;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.Transaction;
import com.amazon.carbonado.filter.Filter;
import com.amazon.carbonado.filter.FilterValues;
/**
* Complete rule-based query engine implementation.
*
* @author Brian S O'Neill
*/
public class QueryEngine<S extends Storable> extends StandardQueryFactory<S>
implements QueryExecutorFactory<S>
{
final RepositoryAccess mRepoAccess;
final QueryExecutorFactory<S> mExecutorFactory;
public QueryEngine(Class<S> type, RepositoryAccess access) {
super(type);
mRepoAccess = access;
mExecutorFactory = new QueryExecutorCache<S>(new UnionQueryAnalyzer<S>(type, access));
}
public QueryExecutor<S> executor(Filter<S> filter, OrderingList<S> ordering)
throws RepositoryException
{
return mExecutorFactory.executor(filter, ordering);
}
protected StandardQuery<S> createQuery(Filter<S> filter,
FilterValues<S> values,
OrderingList<S> ordering)
{
return new Query(filter, values, ordering, null);
}
private class Query extends StandardQuery<S> {
Query(Filter<S> filter,
FilterValues<S> values,
OrderingList<S> ordering,
QueryExecutor<S> executor)
{
super(filter, values, ordering, executor);
}
protected Transaction enterTransaction(IsolationLevel level) {
return mRepoAccess.getRootRepository().enterTransaction(level);
}
protected QueryFactory<S> queryFactory() {
return QueryEngine.this;
}
protected QueryExecutorFactory<S> executorFactory() {
return mExecutorFactory;
}
protected StandardQuery<S> newInstance(FilterValues<S> values,
OrderingList<S> ordering,
QueryExecutor<S> executor)
{
return new Query(values.getFilter(), values, ordering, executor);
}
}
}
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