001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.collections.primitives.adapters;
018    
019    import java.io.Serializable;
020    import java.util.Collection;
021    
022    import org.apache.commons.collections.primitives.LongCollection;
023    
024    /**
025     * Adapts a {@link java.lang.Number Number}-valued
026     * {@link java.util.Collection Collection} to the
027     * {@link LongCollection LongCollection} interface.
028     * <p />
029     * This implementation delegates most methods
030     * to the provided {@link Collection Collection} 
031     * implementation in the "obvious" way.
032     * 
033     * @since Commons Primitives 1.0
034     * @version $Revision: 480462 $ $Date: 2006-11-29 09:15:00 +0100 (Wed, 29 Nov 2006) $
035     * @author Rodney Waldhoff 
036     */
037    final public class CollectionLongCollection extends AbstractCollectionLongCollection implements Serializable {
038        /**
039         * Create an {@link LongCollection LongCollection} wrapping
040         * the specified {@link Collection Collection}.  When
041         * the given <i>collection</i> is <code>null</code>,
042         * returns <code>null</code>.
043         * 
044         * @param collection the (possibly <code>null</code>) {@link Collection} to wrap
045         * @return an {@link LongCollection LongCollection} wrapping the given 
046         *         <i>collection</i>, or <code>null</code> when <i>collection</i> is
047         *         <code>null</code>.
048         */
049        public static LongCollection wrap(Collection collection) {
050            if(null == collection) {
051                return null;
052            } else if(collection instanceof Serializable) {
053                return new CollectionLongCollection(collection);
054            } else {
055                return new NonSerializableCollectionLongCollection(collection);
056            }
057        }
058    
059        /**
060         * Creates an {@link LongCollection LongCollection} wrapping
061         * the specified {@link Collection Collection}.
062         * @see #wrap
063         */
064        public CollectionLongCollection(Collection collection) {
065            _collection = collection;
066        }
067        
068        protected Collection getCollection() {
069            return _collection;
070        }
071     
072        private Collection _collection = null;         
073    }