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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.util.ArrayList;
import java.util.List;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.info.ChainedProperty;
import com.amazon.carbonado.info.StorableProperty;
/**
*
*
* @author Brian S O'Neill
*/
class SQLStatementBuilder<S extends Storable> {
private final JDBCRepository mRepository;
private List<SQLStatement<S>> mStatements;
private StringBuilder mLiteralBuilder;
SQLStatementBuilder(JDBCRepository repository) {
mRepository = repository;
mStatements = new ArrayList<SQLStatement<S>>();
mLiteralBuilder = new StringBuilder();
}
public SQLStatement<S> build() {
if (mStatements.size() == 0 || mLiteralBuilder.length() > 0) {
mStatements.add(new LiteralStatement<S>(mLiteralBuilder.toString()));
mLiteralBuilder.setLength(0);
}
if (mStatements.size() == 1) {
return mStatements.get(0);
} else {
return new CompositeStatement<S>(mStatements);
}
}
public void append(char c) {
mLiteralBuilder.append(c);
}
public void append(String str) {
mLiteralBuilder.append(str);
}
public void append(LiteralStatement<S> statement) {
append(statement.toString());
}
public void append(SQLStatement<S> statement) {
if (statement instanceof LiteralStatement) {
append((LiteralStatement<S>) statement);
} else {
mStatements.add(new LiteralStatement<S>(mLiteralBuilder.toString()));
mLiteralBuilder.setLength(0);
mStatements.add(statement);
}
}
public void appendColumn(JoinNode jn, ChainedProperty<?> chained)
throws FetchException
{
String alias;
if (jn == null) {
alias = null;
} else {
alias = jn.findAliasFor(chained);
}
if (alias != null) {
mLiteralBuilder.append(alias);
mLiteralBuilder.append('.');
}
StorableProperty<?> property = chained.getLastProperty();
JDBCStorableProperty<?> jProperty;
try {
jProperty = mRepository.getJDBCStorableProperty(property);
} catch (RepositoryException e) {
throw mRepository.toFetchException(e);
}
if (jProperty.isJoin()) {
throw new UnsupportedOperationException
("Join property doesn't have a corresponding column: " + chained);
}
mLiteralBuilder.append(jProperty.getColumnName());
}
JDBCRepository getRepository() {
return mRepository;
}
}
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