/*
* $Header: /home/cvs/jakarta-slide/src/stores/org/apache/slide/store/impl/rdbms/expression/RDBMSMergeExpression.java,v 1.4.2.1 2004/09/27 12:54:00 unico Exp $
* $Revision: 1.4.2.1 $
* $Date: 2004/09/27 12:54:00 $
*
* ====================================================================
*
* Copyright 1999-2004 The Apache Software Foundation
*
* 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 org.apache.slide.store.impl.rdbms.expression;
import java.util.Collection;
import java.util.Iterator;
import org.apache.slide.search.BadQueryException;
import org.apache.slide.search.SearchException;
import org.apache.slide.search.basic.IBasicExpression;
import org.apache.slide.search.basic.IBasicResultSet;
/**
*/
public class RDBMSMergeExpression extends RDBMSExpression {
private final String _name;
private final String _namespace;
private final Collection _rdbmsExpressions;
private final Collection _otherExpressions;
public RDBMSMergeExpression(String name,
String namespace,
RDBMSQueryContext context,
Collection rdbmsExpressions,
Collection otherExpressions) throws BadQueryException {
super(context);
_name = name;
_namespace = namespace;
_rdbmsExpressions = rdbmsExpressions;
_otherExpressions = otherExpressions;
}
public IBasicResultSet execute() throws SearchException {
return compile(null);
}
protected IBasicResultSet compile(RDBMSMergeExpression expression) throws SearchException {
if (_rdbmsExpressions != null && _rdbmsExpressions.size() > 0) {
_context.criteria().add(" ( ");
Iterator iter = _rdbmsExpressions.iterator();
while (iter.hasNext()) {
((RDBMSExpression) iter.next()).compile(this);
if (iter.hasNext()) {
_context.criteria().add(" " + _name + " ");
}
}
_context.criteria().add(" ) ");
}
if (_otherExpressions != null) {
IBasicExpression merger = _factory.createStandardMergeExpression(
_name, _namespace, _otherExpressions);
return merger.execute();
}
return _context.results();
}
protected String getName() {
return _name;
}
protected Collection getRDBMSExpressions() {
return _rdbmsExpressions;
}
}