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1 /* 2 * Scope: a generic MVC framework. 3 * Copyright (c) 2000-2002, The Scope team 4 * All rights reserved. 5 * 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * Neither the name "Scope" nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR 27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 * 36 * $Id: CompoundSelectorIterator.java,v 1.5 2002/09/05 15:41:46 ludovicc Exp $ 37 */ 38 package org.scopemvc.model.util; 39 40 41 import java.util.Iterator; 42 import java.util.NoSuchElementException; 43 import org.scopemvc.util.Debug; 44 45 /*** 46 * <P> 47 * 48 * An Iterator that iterates through the iterations of two child Iterators in 49 * sequence. </P> 50 * 51 * @author <A HREF="mailto:smeyfroi@users.sourceforge.net">Steve Meyfroidt</A> 52 * @created 05 September 2002 53 * @version $Revision: 1.5 $ $Date: 2002/09/05 15:41:46 $ 54 */ 55 public final class CompoundSelectorIterator implements Iterator { 56 57 // The rest of the class handles arrays longer than 2 if this is ever needed. 58 private Iterator[] iterators = new Iterator[2]; 59 60 private int currentIndex = -1; 61 62 63 /*** 64 * Constructor for the CompoundSelectorIterator object 65 * 66 * @param inIterator1 TODO: Describe the Parameter 67 * @param inIterator2 TODO: Describe the Parameter 68 */ 69 public CompoundSelectorIterator(Iterator inIterator1, Iterator inIterator2) { 70 if (inIterator1 == null || inIterator2 == null) { 71 throw new IllegalArgumentException("Create CompoundSelectorIterator with two non-null iterators."); 72 } 73 74 iterators[0] = inIterator1; 75 iterators[1] = inIterator2; 76 currentIndex = 0; 77 } 78 79 80 /*** 81 * TODO: document the method 82 * 83 * @return TODO: Describe the Return Value 84 */ 85 public boolean hasNext() { 86 if (Debug.ON) { 87 Debug.assertTrue(currentIndex > -1); 88 } 89 90 if (iterators[currentIndex].hasNext()) { 91 return true; 92 } 93 94 return (currentIndex < iterators.length - 1 && iterators[currentIndex + 1].hasNext()); 95 } 96 97 98 /*** 99 * TODO: document the method 100 * 101 * @return TODO: Describe the Return Value 102 */ 103 public Object next() { 104 if (Debug.ON) { 105 Debug.assertTrue(iterators != null, "null iterators"); 106 } 107 if (!(currentIndex > -1 && currentIndex < iterators.length)) { 108 throw new NoSuchElementException("Iterator past end of Selector list."); 109 } 110 111 if (iterators[currentIndex].hasNext()) { 112 return iterators[currentIndex].next(); 113 } 114 115 ++currentIndex; 116 if (currentIndex >= iterators.length) { 117 throw new NoSuchElementException("Iterator past end of Selector list."); 118 } 119 return iterators[currentIndex].next(); 120 } 121 122 123 /*** 124 * TODO: document the method 125 */ 126 public void remove() { 127 throw new UnsupportedOperationException("Can't remove Selectors from a model."); 128 } 129 } 130

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