MaxAggregateBuilder.java

/**
 * 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.metamodel.query;

import org.apache.metamodel.util.AggregateBuilder;
import org.apache.metamodel.util.ObjectComparator;

final class MaxAggregateBuilder implements AggregateBuilder<Object> {

	private Object max;

	@Override
	public void add(Object o) {
		if (o == null) {
			return;
		}
		if (max == null) {
			max = o;
		} else {
			Comparable<Object> comparable = ObjectComparator.getComparable(max);
			if (comparable.compareTo(o) < 0) {
				max = o;
			}
		}
	}

	@Override
	public Object getAggregate() {
        return max;
	}

}