1  // HTMLParser Library $Name: v1_6_20060319 $ - A java-based parser for HTML
  2  // http://sourceforge.org/projects/htmlparser
  3  // Copyright (C) 2004 Somik Raha
  4  //
  5  // Revision Control Information
  6  //
  7  // $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/tags/BaseHrefTag.java,v $
  8  // $Author: derrickoswald $
  9  // $Date: 2005/04/10 23:20:45 $
 10  // $Revision: 1.40 $
 11  //
 12  // This library is free software; you can redistribute it and/or
 13  // modify it under the terms of the GNU Lesser General Public
 14  // License as published by the Free Software Foundation; either
 15  // version 2.1 of the License, or (at your option) any later version.
 16  //
 17  // This library is distributed in the hope that it will be useful,
 18  // but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 20  // Lesser General Public License for more details.
 21  //
 22  // You should have received a copy of the GNU Lesser General Public
 23  // License along with this library; if not, write to the Free Software
 24  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 25  //
 26  
 27  package org.htmlparser.tags;
 28  
 29  import org.htmlparser.lexer.Page;
 30  import org.htmlparser.nodes.TagNode;
 31  import org.htmlparser.util.ParserException;
 32  
 33  /**
 34   * BaseHrefTag represents an <Base> tag.
 35   * It extends a basic tag by providing an accessor to the HREF attribute.
 36   */
 37  public class BaseHrefTag
 38      extends
 39          TagNode
 40  {
 41      /**
 42       * The set of names handled by this tag.
 43       */
 44      private static final String[] mIds = new String[] {"BASE"};
 45  
 46      /**
 47       * Create a new base tag.
 48       */
 49      public BaseHrefTag ()
 50      {
 51      }
 52  
 53      /**
 54       * Return the set of names handled by this tag.
 55       * @return The names to be matched that create tags of this type.
 56       */
 57      public String[] getIds ()
 58      {
 59          return (mIds);
 60      }
 61  
 62      /**
 63       * Get the value of the <code>HREF</code> attribute, if any.
 64       * @return The <code>HREF</code> value, with the leading and trailing whitespace removed, if any.
 65       */
 66      public String getBaseUrl()
 67      {
 68          String base;
 69  
 70          base = getAttribute ("HREF");
 71          if (base != null && base.length() > 0)
 72              base = base.trim ();
 73          base = (null == base) ? "" : base;
 74          
 75          return (base);
 76      }
 77  
 78      /**
 79       * Set the value of the <code>HREF</code> attribute.
 80       * @param base The new <code>HREF</code> value.
 81       */
 82      public void setBaseUrl (String base)
 83      {
 84          setAttribute ("HREF", base);
 85      }
 86  
 87      /**
 88       * Perform the meaning of this tag.
 89       * This sets the base URL to use for the rest of the page.
 90       * @exception ParserException If setting the base URL fails.
 91       */
 92      public void doSemanticAction () throws ParserException
 93      {
 94          Page page;
 95          
 96          page = getPage ();
 97          if (null != page)
 98              page.setBaseUrl (getBaseUrl ());
 99      }
100  }