aoqi@0: /*
aoqi@0:  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: /*
aoqi@0:  * Copyright (C) 2004-2011
aoqi@0:  *
aoqi@0:  * Permission is hereby granted, free of charge, to any person obtaining a copy
aoqi@0:  * of this software and associated documentation files (the "Software"), to deal
aoqi@0:  * in the Software without restriction, including without limitation the rights
aoqi@0:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
aoqi@0:  * copies of the Software, and to permit persons to whom the Software is
aoqi@0:  * furnished to do so, subject to the following conditions:
aoqi@0:  *
aoqi@0:  * The above copyright notice and this permission notice shall be included in
aoqi@0:  * all copies or substantial portions of the Software.
aoqi@0:  *
aoqi@0:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
aoqi@0:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
aoqi@0:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
aoqi@0:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
aoqi@0:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
aoqi@0:  * THE SOFTWARE.
aoqi@0:  */
aoqi@0: package com.sun.xml.internal.rngom.digested;
aoqi@0: 
aoqi@0: import java.util.HashMap;
aoqi@0: import java.util.Iterator;
aoqi@0: import java.util.Map;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * <grammar> pattern, which is a collection of named patterns.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi (kk@kohsuke.org)
aoqi@0:  */
aoqi@0: public class DGrammarPattern extends DPattern implements Iterable<DDefine> {
aoqi@0:     private final Map<String,DDefine> patterns = new HashMap<String,DDefine>();
aoqi@0: 
aoqi@0:     DPattern start;
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Gets the start pattern.
aoqi@0:      */
aoqi@0:     public DPattern getStart() {
aoqi@0:         return start;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Gets the named pattern by its name.
aoqi@0:      *
aoqi@0:      * @return
aoqi@0:      *      null if not found.
aoqi@0:      */
aoqi@0:     public DDefine get( String name ) {
aoqi@0:         return patterns.get(name);
aoqi@0:     }
aoqi@0: 
aoqi@0:     DDefine getOrAdd( String name ) {
aoqi@0:         if(patterns.containsKey(name)) {
aoqi@0:             return get(name);
aoqi@0:         } else {
aoqi@0:             DDefine d = new DDefine(name);
aoqi@0:             patterns.put(name,d);
aoqi@0:             return d;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Iterates all the {@link DDefine}s in this grammar.
aoqi@0:      */
aoqi@0:     public Iterator<DDefine> iterator() {
aoqi@0:         return patterns.values().iterator();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isNullable() {
aoqi@0:         return start.isNullable();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public <V> V accept( DPatternVisitor<V> visitor ) {
aoqi@0:         return visitor.onGrammar(this);
aoqi@0:     }
aoqi@0: }