com.inet.lib.less.DefaultedHashMap Maven / Gradle / Ivy
/**
* MIT License (MIT)
*
* Copyright (c) 2014 - 2015 Volker Berlin
*
* 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,
* UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @author Volker Berlin
* @license: The MIT license
*/
package com.inet.lib.less;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nonnull;
/**
* HashMap with default values.
*
* @param
* the type of keys maintained by this map
* @param
* the type of mapped values
*/
class DefaultedHashMap extends HashMap {
private final Map defaultValues;
/**
* Create a new instance. The default values are referenced and not copied.
*
* @param defaultValues
* the default values
*/
DefaultedHashMap( @Nonnull Map defaultValues ) {
this.defaultValues = defaultValues;
}
/**
* {@inheritDoc}
*/
@Override
public V get( Object key ) {
V value = super.get( key );
if( value != null ) {
return value;
}
return defaultValues.get( key );
}
}