001: /*
002: * $Header: /home/cvs/jakarta-commons/primitives/src/java/org/apache/commons/collections/primitives/adapters/ListIteratorDoubleListIterator.java,v 1.3 2003/10/16 20:49:38 scolebourne Exp $
003: * ====================================================================
004: * The Apache Software License, Version 1.1
005: *
006: * Copyright (c) 2003 The Apache Software Foundation. All rights
007: * reserved.
008: *
009: * Redistribution and use in source and binary forms, with or without
010: * modification, are permitted provided that the following conditions
011: * are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowledgement:
023: * "This product includes software developed by the
024: * Apache Software Foundation (http://www.apache.org/)."
025: * Alternately, this acknowledgement may appear in the software itself,
026: * if and wherever such third-party acknowledgements normally appear.
027: *
028: * 4. The names "The Jakarta Project", "Commons", and "Apache Software
029: * Foundation" must not be used to endorse or promote products derived
030: * from this software without prior written permission. For written
031: * permission, please contact apache@apache.org.
032: *
033: * 5. Products derived from this software may not be called "Apache"
034: * nor may "Apache" appear in their names without prior written
035: * permission of the Apache Software Foundation.
036: *
037: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
041: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
042: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
043: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
044: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
045: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
046: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
047: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
048: * SUCH DAMAGE.
049: * ====================================================================
050: *
051: * This software consists of voluntary contributions made by many
052: * individuals on behalf of the Apache Software Foundation. For more
053: * information on the Apache Software Foundation, please see
054: * <http://www.apache.org/>.
055: *
056: */
057:
058: package org.apache.commons.collections.primitives.adapters;
059:
060: import java.util.ListIterator;
061:
062: import org.apache.commons.collections.primitives.DoubleListIterator;
063:
064: /**
065: * Adapts a {@link Number}-valued {@link ListIterator ListIterator}
066: * to the {@link DoubleListIterator DoubleListIterator} interface.
067: * <p />
068: * This implementation delegates most methods
069: * to the provided {@link DoubleListIterator DoubleListIterator}
070: * implementation in the "obvious" way.
071: *
072: * @since Commons Primitives 1.0
073: * @version $Revision: 1.3 $ $Date: 2003/10/16 20:49:38 $
074: * @author Rodney Waldhoff
075: */
076: public class ListIteratorDoubleListIterator implements
077: DoubleListIterator {
078:
079: /**
080: * Create an {@link DoubleListIterator DoubleListIterator} wrapping
081: * the specified {@link ListIterator ListIterator}. When
082: * the given <i>iterator</i> is <code>null</code>,
083: * returns <code>null</code>.
084: *
085: * @param iterator the (possibly <code>null</code>)
086: * {@link ListIterator ListIterator} to wrap
087: * @return an {@link DoubleListIterator DoubleListIterator} wrapping the given
088: * <i>iterator</i>, or <code>null</code> when <i>iterator</i> is
089: * <code>null</code>.
090: */
091: public static DoubleListIterator wrap(ListIterator iterator) {
092: return null == iterator ? null
093: : new ListIteratorDoubleListIterator(iterator);
094: }
095:
096: /**
097: * Creates an {@link DoubleListIterator DoubleListIterator} wrapping
098: * the specified {@link ListIterator ListIterator}.
099: * @see #wrap
100: */
101: public ListIteratorDoubleListIterator(ListIterator iterator) {
102: _iterator = iterator;
103: }
104:
105: public int nextIndex() {
106: return _iterator.nextIndex();
107: }
108:
109: public int previousIndex() {
110: return _iterator.previousIndex();
111: }
112:
113: public boolean hasNext() {
114: return _iterator.hasNext();
115: }
116:
117: public boolean hasPrevious() {
118: return _iterator.hasPrevious();
119: }
120:
121: public double next() {
122: return ((Number) _iterator.next()).doubleValue();
123: }
124:
125: public double previous() {
126: return ((Number) _iterator.previous()).doubleValue();
127: }
128:
129: public void add(double element) {
130: _iterator.add(new Double(element));
131: }
132:
133: public void set(double element) {
134: _iterator.set(new Double(element));
135: }
136:
137: public void remove() {
138: _iterator.remove();
139: }
140:
141: private ListIterator _iterator = null;
142:
143: }
|