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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onlab.util;
import java.util.HashMap;
/**
* HashMap that returns a default value for unmapped keys.
*/
public final class DefaultHashMap<K, V> extends HashMap<K, V> {
/** Default value to return when no key binding exists. */
protected final V defaultValue;
/**
* Constructs an empty map with the given default value.
*
* @param defaultValue the default value
*/
public DefaultHashMap(V defaultValue) {
this.defaultValue = defaultValue;
}
@Override
public V get(Object k) {
return containsKey(k) ? super.get(k) : defaultValue;
}
}
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