Initial revision

From-SVN: r102074

libjava/classpath/javax/swing/text/html/parser/ParserDelegator.java

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+/* ParserDelegator.java -- Delegator for ParserDocument.
+    Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package javax.swing.text.html.parser;
+
+import gnu.javax.swing.text.html.parser.HTML_401F;
+import gnu.javax.swing.text.html.parser.htmlAttributeSet;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.Serializable;
+
+import javax.swing.text.BadLocationException;
+import javax.swing.text.html.HTMLEditorKit;
+import javax.swing.text.html.HTMLEditorKit.ParserCallback;
+
+/**
+ * This class instantiates and starts the working instance of
+ * html parser, being responsible for providing the default DTD.
+ *
+ * TODO Later this class must be derived from the totally abstract class
+ * HTMLEditorKit.Parser. HTMLEditorKit that does not yet exist.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class ParserDelegator
+  extends javax.swing.text.html.HTMLEditorKit.Parser
+  implements Serializable
+{
+  private class gnuParser
+    extends gnu.javax.swing.text.html.parser.support.Parser
+  {
+    private static final long serialVersionUID = 1;
+
+    private gnuParser(DTD d)
+    {
+      super(d);
+    }
+
+    protected final void handleComment(char[] comment)
+    {
+      callBack.handleComment(comment, hTag.where.startPosition);
+    }
+
+    protected final void handleEmptyTag(TagElement tag)
+      throws javax.swing.text.ChangedCharSetException
+    {
+      callBack.handleSimpleTag(tag.getHTMLTag(), getAttributes(),
+                               hTag.where.startPosition
+                              );
+    }
+
+    protected final void handleEndTag(TagElement tag)
+    {
+      callBack.handleEndTag(tag.getHTMLTag(), hTag.where.startPosition);
+    }
+
+    protected final void handleError(int line, String message)
+    {
+      callBack.handleError(message, hTag.where.startPosition);
+    }
+
+    protected final void handleStartTag(TagElement tag)
+    {
+      htmlAttributeSet attributes = gnu.getAttributes();
+
+      if (tag.fictional())
+        attributes.addAttribute(ParserCallback.IMPLIED, Boolean.TRUE);
+
+      callBack.handleStartTag(tag.getHTMLTag(), attributes,
+                              hTag.where.startPosition
+                             );
+    }
+
+    protected final void handleText(char[] text)
+    {
+      callBack.handleText(text, hTag.where.startPosition);
+    }
+
+    DTD getDTD()
+    {
+      // Accessing the inherited gnu.javax.swing.text.html.parser.support.Parser
+      // field. super. is a workaround, required to support JDK1.3's javac.
+      return super.dtd;
+    }
+  }
+
+  /**
+   * Use serialVersionUID for interoperability.
+   */
+  private static final long serialVersionUID = -1276686502624777206L;
+
+  private static DTD dtd = HTML_401F.getInstance();
+
+  /**
+   * The callback.
+   * This is package-private to avoid an accessor method.
+   */
+  HTMLEditorKit.ParserCallback callBack;
+
+  /**
+   * The reference to the working class of HTML parser that is
+   * actually used to parse the document.
+   * This is package-private to avoid an accessor method.
+   */
+  gnuParser gnu;
+
+  /**
+   * Parses the HTML document, calling methods of the provided
+   * callback. This method must be multithread - safe.
+   * @param reader The reader to read the HTML document from
+   * @param callback The callback that is notifyed about the presence
+   * of HTML elements in the document.
+   * @param ignoreCharSet If thrue, any charset changes during parsing
+   * are ignored.
+   * @throws java.io.IOException
+   */
+  public void parse(Reader reader, HTMLEditorKit.ParserCallback a_callback,
+                    boolean ignoreCharSet
+                   )
+             throws IOException
+  {
+    callBack = a_callback;
+
+    if (gnu == null || !dtd.equals(gnu.getDTD()))
+      {
+        gnu = new gnuParser(dtd);
+      }
+
+    gnu.parse(reader);
+
+    callBack.handleEndOfLineString(gnu.getEndOfLineSequence());
+    try
+      {
+        callBack.flush();
+      }
+    catch (BadLocationException ex)
+      {
+        // Convert this into the supported type of exception.
+        throw new IOException(ex.getMessage());
+      }
+  }
+
+  /**
+   * Calling this method instructs that, if not specified directly,
+   * the documents will be parsed using the default
+   * DTD of the implementation.
+   */
+  protected static void setDefaultDTD()
+  {
+    dtd = HTML_401F.getInstance();
+  }
+
+  /**
+   * Registers the user - written DTD under the given name, also
+   * making it default for the subsequent parsings. This has effect on
+   * all subsequent calls to the parse(...) . If you need to specify
+   * your DTD locally, simply {@link javax.swing.text.html.parser.Parser}
+   * instead.
+   * @param dtd The DTD that will be used to parse documents by this class.
+   * @param name The name of this DTD.
+   * @return No standard is specified on which instance of DTD must be
+   * returned by this method, and it is recommended to leave the returned
+   * value without consideration. This implementation returns the DTD
+   * that was previously set as the default DTD, or the implementations
+   * default DTD if none was set.
+   */
+  protected static DTD createDTD(DTD a_dtd, String name)
+  {
+    DTD.putDTDHash(name, a_dtd);
+
+    DTD dtd_prev = dtd;
+    dtd = a_dtd;
+    return dtd_prev;
+  }
+}