001 /*
002 * Copyright 1998-2002 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package javax.swing.text.html.parser;
027
028 import javax.swing.text.html.HTMLEditorKit;
029 import java.io.BufferedInputStream;
030 import java.io.IOException;
031 import java.io.InputStream;
032 import java.io.DataInputStream;
033 import java.io.ObjectInputStream;
034 import java.io.Reader;
035 import java.io.Serializable;
036 import java.lang.reflect.Method;
037
038 /**
039 * Responsible for starting up a new DocumentParser
040 * each time its parse method is invoked. Stores a
041 * reference to the dtd.
042 *
043 * @author Sunita Mani
044 * @version 1.22, 05/05/07
045 */
046
047 public class ParserDelegator extends HTMLEditorKit.Parser implements
048 Serializable {
049
050 private static DTD dtd = null;
051
052 protected static synchronized void setDefaultDTD() {
053 if (dtd == null) {
054 DTD _dtd = null;
055 // (PENDING) Hate having to hard code!
056 String nm = "html32";
057 try {
058 _dtd = DTD.getDTD(nm);
059 } catch (IOException e) {
060 // (PENDING) UGLY!
061 System.out
062 .println("Throw an exception: could not get default dtd: "
063 + nm);
064 }
065 dtd = createDTD(_dtd, nm);
066 }
067 }
068
069 protected static DTD createDTD(DTD dtd, String name) {
070
071 InputStream in = null;
072 boolean debug = true;
073 try {
074 String path = name + ".bdtd";
075 in = getResourceAsStream(path);
076 if (in != null) {
077 dtd.read(new DataInputStream(
078 new BufferedInputStream(in)));
079 dtd.putDTDHash(name, dtd);
080 }
081 } catch (Exception e) {
082 System.out.println(e);
083 }
084 return dtd;
085 }
086
087 public ParserDelegator() {
088 if (dtd == null) {
089 setDefaultDTD();
090 }
091 }
092
093 public void parse(Reader r, HTMLEditorKit.ParserCallback cb,
094 boolean ignoreCharSet) throws IOException {
095 new DocumentParser(dtd).parse(r, cb, ignoreCharSet);
096 }
097
098 /**
099 * Fetch a resource relative to the ParserDelegator classfile.
100 * If this is called on 1.2 the loading will occur under the
101 * protection of a doPrivileged call to allow the ParserDelegator
102 * to function when used in an applet.
103 *
104 * @param name the name of the resource, relative to the
105 * ParserDelegator class.
106 * @returns a stream representing the resource
107 */
108 static InputStream getResourceAsStream(String name) {
109 try {
110 return ResourceLoader.getResourceAsStream(name);
111 } catch (Throwable e) {
112 // If the class doesn't exist or we have some other
113 // problem we just try to call getResourceAsStream directly.
114 return ParserDelegator.class.getResourceAsStream(name);
115 }
116 }
117
118 private void readObject(ObjectInputStream s)
119 throws ClassNotFoundException, IOException {
120 s.defaultReadObject();
121 if (dtd == null) {
122 setDefaultDTD();
123 }
124 }
125 }
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