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/*
* Copyright 2007-2012 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.repo.jdbc;
import java.lang.reflect.UndeclaredThrowableException;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.filter.ExistsFilter;
import com.amazon.carbonado.filter.PropertyFilter;
import com.amazon.carbonado.filter.Visitor;
import com.amazon.carbonado.info.ChainedProperty;
import com.amazon.carbonado.info.OrderedProperty;
import com.amazon.carbonado.qe.OrderingList;
/**
* Filter visitor that constructs a JoinNode tree.
*
* @author Brian S O'Neill
*/
class JoinNodeBuilder<S extends Storable> extends Visitor<S, Object, Object> {
private final JDBCRepository mRepository;
private final TableAliasGenerator mAliasGenerator;
private final JoinNode mRootJoinNode;
JoinNodeBuilder(JDBCRepository repository,
JDBCStorableInfo<S> info,
TableAliasGenerator aliasGenerator)
{
mRepository = repository;
mAliasGenerator = aliasGenerator;
mRootJoinNode = new JoinNode(info, aliasGenerator.nextAlias());
}
public JoinNode getRootJoinNode() {
return mRootJoinNode;
}
/**
* Processes the given property orderings and ensures that they are
* part of the JoinNode tree.
*
* @throws UndeclaredThrowableException wraps a RepositoryException
*/
public void captureOrderings(OrderingList<?> ordering) {
try {
if (ordering != null) {
for (OrderedProperty<?> orderedProperty : ordering) {
ChainedProperty<?> chained = orderedProperty.getChainedProperty();
if (!chained.isDerived()) {
mRootJoinNode.addJoin(mRepository, chained, mAliasGenerator);
}
}
}
} catch (RepositoryException e) {
throw new UndeclaredThrowableException(e);
}
}
/**
* @throws UndeclaredThrowableException wraps a RepositoryException
* since RepositoryException cannot be thrown directly
*/
@Override
public Object visit(PropertyFilter<S> filter, Object param) {
try {
visit(filter);
return null;
} catch (RepositoryException e) {
throw new UndeclaredThrowableException(e);
}
}
private void visit(PropertyFilter<S> filter) throws RepositoryException {
ChainedProperty<S> chained = filter.getChainedProperty();
mRootJoinNode.addJoin(mRepository, chained, mAliasGenerator);
}
/**
* @throws UndeclaredThrowableException wraps a RepositoryException
* since RepositoryException cannot be thrown directly
*/
@Override
public Object visit(ExistsFilter<S> filter, Object param) {
try {
visit(filter);
return null;
} catch (RepositoryException e) {
throw new UndeclaredThrowableException(e);
}
}
private void visit(ExistsFilter<S> filter) throws RepositoryException {
mRootJoinNode.aliasIsRequired();
ChainedProperty<S> chained = filter.getChainedProperty();
mRootJoinNode.addJoin(mRepository, chained, mAliasGenerator);
}
}
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