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core module for querydsl

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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 * 
 * 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;

/**
 * A stateful collector of column values for a group.
 * 
 * @author sasa
 * @param  Target type (e.g. List, Set)
 */
public interface GroupCollector {
    
    /**
     * Add given value to this group
     * 
     * @param o
     */
    void add(T o);

    /**
     * @return Value of this group.
     */
    R get();
    
}