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.util.Iterator;
020    
021    import org.apache.commons.collections.primitives.BooleanIterator;
022    
023    /**
024     * Adapts a {@link Boolean Boolean}-valued {@link java.util.Iterator Iterator}
025     * to the {@link org.apache.commons.collections.primitives.BooleanIterator
026     * BooleanIterator} interface.
027     * <p />
028     * This implementation delegates most methods to the provided {@link
029     * java.util.Iterator Iterator} implementation in the "obvious" way.
030     *
031     * @since Commons Primitives 1.2
032     * @version $Revision: 480462 $
033     */
034    public class IteratorBooleanIterator implements BooleanIterator {
035        
036        /**
037         * Create an {@link org.apache.commons.collections.primitives.BooleanIterator
038         * BooleanIterator} wrapping the specified {@link java.util.Iterator
039         * Iterator}.  When the given <i>iterator</i> is <code>null</code>, returns
040         * <code>null</code>.
041         * 
042         * @param iterator the (possibly <code>null</code>)
043         *        {@link java.util.Iterator Iterator} to wrap
044         * @return an {@link
045         * org.apache.commons.collections.primitives.BooleanIterator BooleanIterator}
046         * wrapping the given <i>iterator</i>, or <code>null</code> when <i>
047         * iterator</i> is <code>null</code>.
048         */
049        public static BooleanIterator wrap(Iterator iterator) {
050            return null == iterator ? null : new IteratorBooleanIterator(iterator);
051        }
052       
053        /**
054         * Creates an {@link org.apache.commons.collections.primitives.BooleanIterator
055         * BooleanIterator} wrapping the specified {@link java.util.Iterator Iterator}.
056         * @see #wrap
057         */
058        public IteratorBooleanIterator(Iterator iterator) {
059            _iterator = iterator;
060        }
061        
062        public boolean hasNext() {
063            return _iterator.hasNext();
064        }
065        
066        public boolean next() {
067            return ((Boolean)(_iterator.next())).booleanValue();
068        }
069        
070        public void remove() {
071            _iterator.remove();
072        }
073        
074        private Iterator _iterator = null;
075    
076    }