com.mysema.query.group.GOne Maven / Gradle / Ivy
/*
* Copyright 2011, 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 com.mysema.query.types.Expression;
/**
* @author tiwe
*
* @param
*/
class GOne extends AbstractGroupExpression {
private static final long serialVersionUID = 3518868612387641383L;
@SuppressWarnings("unchecked")
public GOne(Expression expr) {
super((Class)expr.getType(), expr);
}
@Override
public GroupCollector createGroupCollector() {
return new GroupCollector() {
private boolean first = true;
private T val;
@Override
public void add(T o) {
if (first) {
val = o;
first = false;
}
}
@Override
public T get() {
return val;
}
};
}
}