/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.openjpa.kernel.exps;
import java.util.Collection;
import java.util.Iterator;
/**
* Find the max.
*
* @author Abe White
*/
class Max
extends AggregateVal {
/**
* Constructor. Provide the value to maximize.
*/
public Max(Val val) {
super(val);
}
protected Class getType(Class c) {
return c;
}
protected Object operate(Collection os, Class c) {
Comparable max = null;
Comparable cur;
for (Iterator itr = os.iterator(); itr.hasNext();) {
cur = (Comparable) itr.next();
if (cur != null && (max == null || max.compareTo(cur) < 0))
max = cur;
}
return max;
}
}