com.mysema.query.group.GAvg Maven / Gradle / Ivy
/*
* Copyright 2012, Mysema Ltd
*
* 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 com.mysema.query.group;
import java.math.BigDecimal;
import com.mysema.query.types.Expression;
import com.mysema.util.MathUtils;
/**
* @author tiwe
*
* @param
*/
@SuppressWarnings("unchecked")
public class GAvg> extends AbstractGroupExpression {
private static final long serialVersionUID = 3518868612387641383L;
public GAvg(Expression expr) {
super((Class) expr.getType(), expr);
}
@Override
public GroupCollector createGroupCollector() {
return new GroupCollector() {
private int count = 0;
private BigDecimal sum = BigDecimal.ZERO;
@Override
public void add(T t) {
count++;
if (t != null) {
sum = sum.add(new BigDecimal(t.toString()));
}
}
@Override
public T get() {
BigDecimal avg = sum.divide(BigDecimal.valueOf(count));
return MathUtils.cast(avg, (Class) getType());
}
};
}
}