com.google.gwt.dev.util.collect.IntHashMultimap Maven / Gradle / Ivy
/*
* Copyright 2014 Google Inc.
*
* 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.google.gwt.dev.util.collect;
import cern.colt.list.IntArrayList;
/**
* An int multimap that cannot hold duplicate key-value pairs.
*
* Because only int primitives are used performance and memory usage can surpass Object set
* multimaps.
*/
public class IntHashMultimap extends IntMultimap {
@Override
public void put(int key, int value) {
Object objectValues = map.get(key);
if (objectValues != null) {
IntArrayList listValues = (IntArrayList) objectValues;
// Don't add duplicate values.
if (!listValues.contains(value)) {
listValues.add(value);
}
} else {
IntArrayList listValues = new IntArrayList();
listValues.add(value);
map.put(key, listValues);
}
}
}