1 /* 2 * Copyright (c) 2005, 2010, 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 */ 46 package com.sun.xml.internal.rngom.binary.visitor; 47 48 import com.sun.xml.internal.rngom.binary.Pattern; 49 import com.sun.xml.internal.rngom.nc.NameClass; 50 51 import java.util.HashSet; 52 import java.util.Set; 53 54 /** 55 * Visits a pattern and creates a list of possible child elements. 56 * 57 * <p> 58 * One can use a similar technique to introspect a pattern. 59 * 60 * @author Kohsuke Kawaguchi (kk@kohsuke.org) 61 */ 62 public class ChildElementFinder extends PatternWalker { 63 64 private final Set children = new HashSet(); 65 66 /** 67 * Represents a child element. 68 */ 69 public static class Element { 70 public final NameClass nc; 71 public final Pattern content; 72 73 public Element(NameClass nc, Pattern content) { 74 this.nc = nc; 75 this.content = content; 76 } 77 78 public boolean equals(Object o) { 79 if (this == o) return true; 80 if (!(o instanceof Element)) return false; 81 82 final Element element = (Element) o; 83 84 if (content != null ? !content.equals(element.content) : element.content != null) return false; 85 if (nc != null ? !nc.equals(element.nc) : element.nc != null) return false; 86 87 return true; 88 } 89 90 public int hashCode() { 91 int result; 92 result = (nc != null ? nc.hashCode() : 0); 93 result = 29 * result + (content != null ? content.hashCode() : 0); 94 return result; 95 } 96 } 97 98 /** 99 * Returns a set of {@link Element}. 100 */ 101 public Set getChildren() { 102 return children; 103 } 104 105 public void visitElement(NameClass nc, Pattern content) { 106 children.add(new Element(nc,content)); 107 } 108 109 public void visitAttribute(NameClass ns, Pattern value) { 110 // there will be no element inside attribute, 111 // so don't go in there. 112 } 113 114 public void visitList(Pattern p) { 115 // there will be no element inside a list, 116 // so don't go in there. 117 } 118 }