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The ANTLR 4 grammar compiler.
/*
* Copyright (c) 2012 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD-3-Clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.misc;
import java.util.HashMap;
/** Count how many of each key we have; not thread safe */
public class FrequencySet extends HashMap {
private static final long serialVersionUID = -134984205245480177L;
public int count(T key) {
MutableInt value = get(key);
if (value == null) return 0;
return value.v;
}
public void add(T key) {
MutableInt value = get(key);
if (value == null) {
value = new MutableInt(1);
put(key, value);
}
else {
value.v++;
}
}
}