/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.function.aggregate;
import java.util.List;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
import org.teiid.core.types.XMLType;
import org.teiid.query.function.source.XMLSystemFunctions.XmlConcat;
import org.teiid.query.util.CommandContext;
/**
* Aggregates XML entries
*/
public class XMLAgg extends SingleArgumentAggregateFunction {
private XMLType result;
private XmlConcat concat;
public XMLAgg() {
}
public void reset() {
concat = null;
result = null;
}
/**
* @throws TeiidProcessingException
* @throws TeiidComponentException
* @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(List, CommandContext, CommandContext)
*/
public void addInputDirect(Object input, List<?> tuple, CommandContext commandContext) throws TeiidComponentException, TeiidProcessingException {
if (concat == null) {
concat = new XmlConcat(commandContext.getBufferManager());
}
concat.addValue(input);
}
/**
* @throws TeiidProcessingException
* @throws TeiidComponentException
* @see org.teiid.query.function.aggregate.AggregateFunction#getResult(CommandContext)
*/
public Object getResult(CommandContext commandContext) throws TeiidComponentException, TeiidProcessingException {
if (result == null) {
if (concat == null) {
return null;
}
result = concat.close(commandContext);
concat = null;
}
return result;
}
}