1 /*
   2  * Copyright (c) 1998, 2014, 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 javax.swing.text.html.parser;
  27 
  28 import sun.awt.AppContext;
  29 
  30 import javax.swing.text.html.HTMLEditorKit;
  31 import java.io.BufferedInputStream;
  32 import java.io.IOException;
  33 import java.io.InputStream;
  34 import java.io.DataInputStream;
  35 import java.io.ObjectInputStream;
  36 import java.io.Reader;
  37 import java.io.Serializable;
  38 
  39 /**
  40  * Responsible for starting up a new DocumentParser
  41  * each time its parse method is invoked. Stores a
  42  * reference to the dtd.
  43  *
  44  * @author  Sunita Mani
  45  */
  46 
  47 public class ParserDelegator extends HTMLEditorKit.Parser implements Serializable {
  48 
  49     private static final Object DTD_KEY = new Object();
  50 
  51     protected static void setDefaultDTD() {
  52         getDefaultDTD();
  53     }
  54 
  55     private static synchronized DTD getDefaultDTD() {
  56         AppContext appContext = AppContext.getAppContext();
  57 
  58         DTD dtd = (DTD) appContext.get(DTD_KEY);
  59 
  60         if (dtd == null) {
  61             DTD _dtd = null;
  62             // (PENDING) Hate having to hard code!
  63             String nm = "html32";
  64             try {
  65                 _dtd = DTD.getDTD(nm);
  66             } catch (IOException e) {
  67                 // (PENDING) UGLY!
  68                 System.out.println("Throw an exception: could not get default dtd: " + nm);
  69             }
  70             dtd = createDTD(_dtd, nm);
  71 
  72             appContext.put(DTD_KEY, dtd);
  73         }
  74 
  75         return dtd;
  76     }
  77 
  78     protected static DTD createDTD(DTD dtd, String name) {
  79 
  80         InputStream in = null;
  81         boolean debug = true;
  82         try {
  83             String path = name + ".bdtd";
  84             in = getResourceAsStream(path);
  85             if (in != null) {
  86                 dtd.read(new DataInputStream(new BufferedInputStream(in)));
  87                 DTD.putDTDHash(name, dtd);
  88             }
  89         } catch (Exception e) {
  90             System.out.println(e);
  91         }
  92         return dtd;
  93     }
  94 
  95 
  96     public ParserDelegator() {
  97         setDefaultDTD();
  98     }
  99 
 100     public void parse(Reader r, HTMLEditorKit.ParserCallback cb, boolean ignoreCharSet) throws IOException {
 101         new DocumentParser(getDefaultDTD()).parse(r, cb, ignoreCharSet);
 102     }
 103 
 104     /**
 105      * Fetch a resource relative to the ParserDelegator classfile.
 106      * If this is called on 1.2 the loading will occur under the
 107      * protection of a doPrivileged call to allow the ParserDelegator
 108      * to function when used in an applet.
 109      *
 110      * @param name the name of the resource, relative to the
 111      *  ParserDelegator class.
 112      * @returns a stream representing the resource
 113      */
 114     static InputStream getResourceAsStream(String name) {
 115         try {
 116             return ResourceLoader.getResourceAsStream(name);
 117         } catch (Throwable e) {
 118             // If the class doesn't exist or we have some other
 119             // problem we just try to call getResourceAsStream directly.
 120             return ParserDelegator.class.getResourceAsStream(name);
 121         }
 122     }
 123 
 124     private void readObject(ObjectInputStream s)
 125         throws ClassNotFoundException, IOException {
 126         s.defaultReadObject();
 127         setDefaultDTD();
 128     }
 129 }