1/* 2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25/* 26 * Copyright (C) 2004-2011 27 * 28 * Permission is hereby granted, free of charge, to any person obtaining a copy 29 * of this software and associated documentation files (the "Software"), to deal 30 * in the Software without restriction, including without limitation the rights 31 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 32 * copies of the Software, and to permit persons to whom the Software is 33 * furnished to do so, subject to the following conditions: 34 * 35 * The above copyright notice and this permission notice shall be included in 36 * all copies or substantial portions of the Software. 37 * 38 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 39 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 40 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 41 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 42 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 43 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 44 * THE SOFTWARE. 45 */ 46package com.sun.xml.internal.rngom.digested; 47 48import java.util.Iterator; 49 50 51/** 52 * A pattern that can contain other patterns. 53 * 54 * @author Kohsuke Kawaguchi (kk@kohsuke.org) 55 */ 56public abstract class DContainerPattern extends DPattern implements Iterable<DPattern> { 57 private DPattern head; 58 private DPattern tail; 59 60 public DPattern firstChild() { 61 return head; 62 } 63 64 public DPattern lastChild() { 65 return tail; 66 } 67 68 public int countChildren() { 69 int i=0; 70 for( DPattern p=firstChild(); p!=null; p=p.next) 71 i++; 72 return i; 73 } 74 75 public Iterator<DPattern> iterator() { 76 return new Iterator<DPattern>() { 77 DPattern next = head; 78 public boolean hasNext() { 79 return next!=null; 80 } 81 82 public DPattern next() { 83 DPattern r = next; 84 next = next.next; 85 return r; 86 } 87 88 public void remove() { 89 throw new UnsupportedOperationException(); 90 } 91 }; 92 } 93 94 void add( DPattern child ) { 95 if(tail==null) { 96 child.prev = child.next = null; 97 head = tail = child; 98 } else { 99 child.prev = tail; 100 tail.next = child; 101 child.next = null; 102 tail = child; 103 } 104 } 105} 106