// GenericsNote: Converted.
/*
* Copyright 2003-2004 The Apache Software Foundation
*
* 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 php.runtime.common.collections.map;
import java.util.Comparator;
import java.util.SortedMap;
/**
* Provides a base decorator that enables additional functionality to be added
* to a Map via decoration.
* <p/>
* Methods are forwarded directly to the decorated map.
* <p/>
* This implementation does not perform any special processing with the map views.
* Instead it simply returns the set/collection from the wrapped map. This may be
* undesirable, for example if you are trying to write a validating implementation
* it would provide a loophole around the validation.
* But, you might want that loophole, so this class is kept simple.
*
* @author Matt Hall, John Watkinson, Stephen Colebourne
* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:32 $
* @since Commons Collections 3.0
*/
public abstract class AbstractSortedMapDecorator <K,V> extends AbstractMapDecorator<K, V> implements SortedMap<K, V> {
/**
* Constructor only used in deserialization, do not use otherwise.
*
* @since Commons Collections 3.1
*/
protected AbstractSortedMapDecorator() {
super();
}
/**
* Constructor that wraps (not copies).
*
* @param map the map to decorate, must not be null
* @throws IllegalArgumentException if the collection is null
*/
public AbstractSortedMapDecorator(SortedMap<K, V> map) {
super(map);
}
/**
* Gets the map being decorated.
*
* @return the decorated map
*/
protected SortedMap<K, V> getSortedMap() {
return (SortedMap<K, V>) map;
}
//-----------------------------------------------------------------------
public Comparator<? super K> comparator() {
return getSortedMap().comparator();
}
public K firstKey() {
return getSortedMap().firstKey();
}
public SortedMap<K, V> headMap(K toKey) {
return getSortedMap().headMap(toKey);
}
public K lastKey() {
return getSortedMap().lastKey();
}
public SortedMap<K, V> subMap(K fromKey, K toKey) {
return getSortedMap().subMap(fromKey, toKey);
}
public SortedMap<K, V> tailMap(K fromKey) {
return getSortedMap().tailMap(fromKey);
}
}