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Java > Open Source Codes > org > apache > commons > collections > primitives > adapters > IteratorDoubleIterator


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.commons.collections.primitives.adapters;
18
19 import java.util.Iterator JavaDoc;
20
21 import org.apache.commons.collections.primitives.DoubleIterator;
22
23 /**
24  * Adapts a {@link java.lang.Number Number}-valued
25  * {@link Iterator Iterator}
26  * to the {@link DoubleIterator DoubleIterator}
27  * interface.
28  * <p />
29  * This implementation delegates most methods
30  * to the provided {@link Iterator Iterator}
31  * implementation in the "obvious" way.
32  *
33  * @since Commons Primitives 1.0
34  * @version $Revision: 480462 $ $Date: 2006-11-29 00:15:00 -0800 (Wed, 29 Nov 2006) $
35  * @author Rodney Waldhoff
36  */
37 public class IteratorDoubleIterator implements DoubleIterator {
38     
39     /**
40      * Create an {@link DoubleIterator DoubleIterator} wrapping
41      * the specified {@link Iterator Iterator}. When
42      * the given <i>iterator</i> is <code>null</code>,
43      * returns <code>null</code>.
44      *
45      * @param iterator the (possibly <code>null</code>)
46      * {@link Iterator Iterator} to wrap
47      * @return an {@link DoubleIterator DoubleIterator} wrapping the given
48      * <i>iterator</i>, or <code>null</code> when <i>iterator</i> is
49      * <code>null</code>.
50      */
51     public static DoubleIterator wrap(Iterator JavaDoc iterator) {
52         return null == iterator ? null : new IteratorDoubleIterator(iterator);
53     }
54    
55     /**
56      * Creates an {@link DoubleIterator DoubleIterator} wrapping
57      * the specified {@link Iterator Iterator}.
58      * @see #wrap
59      */
60     public IteratorDoubleIterator(Iterator JavaDoc iterator) {
61         _iterator = iterator;
62     }
63     
64     public boolean hasNext() {
65         return _iterator.hasNext();
66     }
67     
68     public double next() {
69         return ((Number JavaDoc)(_iterator.next())).doubleValue();
70     }
71     
72     public void remove() {
73         _iterator.remove();
74     }
75     
76     private Iterator JavaDoc _iterator = null;
77
78 }
79
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