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 package com.sun.xml.internal.rngom.digested; 27 28 import java.util.HashMap; 29 import java.util.Iterator; 30 import java.util.Map; 31 32 /** 33 * <grammar> pattern, which is a collection of named patterns. 34 * 35 * @author Kohsuke Kawaguchi (kk@kohsuke.org) 36 */ 37 public class DGrammarPattern extends DPattern implements Iterable<DDefine> { 38 private final Map<String,DDefine> patterns = new HashMap<String,DDefine>(); 39 40 DPattern start; 41 42 /** 43 * Gets the start pattern. 44 */ 45 public DPattern getStart() { 46 return start; 47 } 48 49 /** 50 * Gets the named pattern by its name. 51 * 52 * @return 53 * null if not found. 54 */ 55 public DDefine get( String name ) { 56 return patterns.get(name); 57 } 58 59 DDefine getOrAdd( String name ) { 60 if(patterns.containsKey(name)) { 61 return get(name); 62 } else { 63 DDefine d = new DDefine(name); 64 patterns.put(name,d); 65 return d; 66 } 67 } 68 69 /** 70 * Iterates all the {@link DDefine}s in this grammar. 71 */ 72 public Iterator<DDefine> iterator() { 73 return patterns.values().iterator(); 74 } 75 76 public boolean isNullable() { 77 return start.isNullable(); 78 } 79 80 public <V> V accept( DPatternVisitor<V> visitor ) { 81 return visitor.onGrammar(this); 82 } 83 }