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Commons Collections example source code file (AbstractSortedMapDecorator.java)

This example Commons Collections source code file (AbstractSortedMapDecorator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

abstractmapdecorator, abstractsortedmapdecorator, abstractsortedmapdecorator, comparator, comparator, object, object, sortedmap, sortedmap, util

The Commons Collections AbstractSortedMapDecorator.java source code

 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.commons.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.
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * @author Stephen Colebourne
public abstract class AbstractSortedMapDecorator
        extends AbstractMapDecorator implements SortedMap {

     * Constructor only used in deserialization, do not use otherwise.
     * @since Commons Collections 3.1
    protected AbstractSortedMapDecorator() {

     * 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 map) {

     * Gets the map being decorated.
     * @return the decorated map
    protected SortedMap getSortedMap() {
        return (SortedMap) map;

    public Comparator comparator() {
        return getSortedMap().comparator();

    public Object firstKey() {
        return getSortedMap().firstKey();

    public SortedMap headMap(Object toKey) {
        return getSortedMap().headMap(toKey);

    public Object lastKey() {
        return getSortedMap().lastKey();

    public SortedMap subMap(Object fromKey, Object toKey) {
        return getSortedMap().subMap(fromKey, toKey);

    public SortedMap tailMap(Object fromKey) {
        return getSortedMap().tailMap(fromKey);


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