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1 /* |
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2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 /* |
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26 * Copyright (C) 2004-2011 |
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27 * |
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28 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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29 * of this software and associated documentation files (the "Software"), to deal |
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30 * in the Software without restriction, including without limitation the rights |
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31 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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32 * copies of the Software, and to permit persons to whom the Software is |
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33 * furnished to do so, subject to the following conditions: |
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34 * |
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35 * The above copyright notice and this permission notice shall be included in |
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36 * all copies or substantial portions of the Software. |
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37 * |
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38 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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39 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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40 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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41 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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42 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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43 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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44 * THE SOFTWARE. |
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45 */ |
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46 package com.sun.xml.internal.rngom.digested; |
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47 |
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48 import java.util.Iterator; |
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49 |
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50 |
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51 /** |
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52 * A pattern that can contain other patterns. |
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53 * |
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54 * @author Kohsuke Kawaguchi (kk@kohsuke.org) |
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55 */ |
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56 public abstract class DContainerPattern extends DPattern implements Iterable<DPattern> { |
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57 private DPattern head; |
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58 private DPattern tail; |
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59 |
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60 public DPattern firstChild() { |
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61 return head; |
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62 } |
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63 |
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64 public DPattern lastChild() { |
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65 return tail; |
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66 } |
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67 |
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68 public int countChildren() { |
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69 int i=0; |
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70 for( DPattern p=firstChild(); p!=null; p=p.next) |
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71 i++; |
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72 return i; |
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73 } |
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74 |
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75 public Iterator<DPattern> iterator() { |
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76 return new Iterator<DPattern>() { |
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77 DPattern next = head; |
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78 public boolean hasNext() { |
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79 return next!=null; |
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80 } |
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81 |
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82 public DPattern next() { |
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83 DPattern r = next; |
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84 next = next.next; |
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85 return r; |
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86 } |
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87 |
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88 public void remove() { |
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89 throw new UnsupportedOperationException(); |
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90 } |
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91 }; |
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92 } |
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93 |
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94 void add( DPattern child ) { |
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95 if(tail==null) { |
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96 child.prev = child.next = null; |
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97 head = tail = child; |
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98 } else { |
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99 child.prev = tail; |
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100 tail.next = child; |
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101 child.next = null; |
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102 tail = child; |
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103 } |
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104 } |
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105 } |