/*
* 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.api.exception.query.ExpressionEvaluationException;
import org.teiid.api.exception.query.FunctionExecutionException;
import org.teiid.core.TeiidComponentException;
import org.teiid.query.QueryPlugin;
/**
*/
public class Min extends AggregateFunction {
private Object minValue;
public void reset() {
minValue = null;
}
/**
* @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(Object, List)
*/
public void addInputDirect(Object value, List<?> tuple)
throws FunctionExecutionException, ExpressionEvaluationException, TeiidComponentException {
if(minValue == null) {
minValue = value;
} else {
if(value instanceof Comparable) {
Comparable valueComp = (Comparable) value;
if(valueComp.compareTo(minValue) < 0) {
minValue = valueComp;
}
} else {
throw new FunctionExecutionException("ERR.015.001.0050", QueryPlugin.Util.getString("ERR.015.001.0050", "MIN", value.getClass().getName())); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
}
}
/**
* @see org.teiid.query.function.aggregate.AggregateFunction#getResult()
*/
public Object getResult() {
return this.minValue;
}
}