/*******************************************************************************
* Copyright 2013 SAP AG
*
* 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.sap.core.odata.processor.core.jpa.jpql;
import com.sap.core.odata.processor.api.jpa.exception.ODataJPARuntimeException;
import com.sap.core.odata.processor.api.jpa.jpql.JPQLContextView;
import com.sap.core.odata.processor.api.jpa.jpql.JPQLSelectSingleContextView;
import com.sap.core.odata.processor.api.jpa.jpql.JPQLStatement;
import com.sap.core.odata.processor.api.jpa.jpql.JPQLStatement.JPQLStatementBuilder;
import com.sap.core.odata.processor.core.jpa.ODataExpressionParser;
public class JPQLSelectSingleStatementBuilder extends JPQLStatementBuilder {
JPQLStatement jpqlStatement;
private JPQLSelectSingleContextView context;
public JPQLSelectSingleStatementBuilder(final JPQLContextView context) {
this.context = (JPQLSelectSingleContextView) context;
}
@Override
public JPQLStatement build() throws ODataJPARuntimeException {
jpqlStatement = createStatement(createJPQLQuery());
return jpqlStatement;
}
private String createJPQLQuery() throws ODataJPARuntimeException {
StringBuilder jpqlQuery = new StringBuilder();
String tableAlias = context.getJPAEntityAlias();
String fromClause = context.getJPAEntityName()
+ JPQLStatement.DELIMITER.SPACE + tableAlias;
jpqlQuery.append(JPQLStatement.KEYWORD.SELECT).append(
JPQLStatement.DELIMITER.SPACE);
jpqlQuery.append(context.getSelectExpression()).append(JPQLStatement.DELIMITER.SPACE);
jpqlQuery.append(JPQLStatement.KEYWORD.FROM).append(JPQLStatement.DELIMITER.SPACE);
jpqlQuery.append(fromClause);
if (context.getKeyPredicates() != null
&& context.getKeyPredicates().size() > 0) {
jpqlQuery.append(JPQLStatement.DELIMITER.SPACE);
jpqlQuery.append(JPQLStatement.KEYWORD.WHERE).append(JPQLStatement.DELIMITER.SPACE);
jpqlQuery.append(ODataExpressionParser.parseKeyPredicates(context.getKeyPredicates(),
context.getJPAEntityAlias()));
}
return jpqlQuery.toString();
}
}