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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package reflex.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import reflex.value.ReflexValue;

public class CountingHashMap {
    private Map counts = new HashMap();

    public CountingHashMap() {

    }

    public void addValue(ReflexValue value) {
        Object aspect = value.asObject();
        if (counts.containsKey(aspect)) {
            int newValue = counts.get(aspect).intValue() + 1;
            counts.put(aspect, Integer.valueOf(newValue));
        } else {
            counts.put(aspect, Integer.valueOf(1));
        }
    }

    public List difference() {
        List ret = new ArrayList(counts.entrySet().size());
        for (Map.Entry entry : counts.entrySet()) {
            if (entry.getValue() == 1) {
                ret.add(new ReflexValue(entry.getKey()));
            }
        }
        return ret;
    }
}