001    /* SAXSource.java --
002       Copyright (C) 2004, 2005  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package javax.xml.transform.sax;
039    
040    import java.io.InputStream;
041    import java.io.Reader;
042    import javax.xml.transform.Source;
043    import javax.xml.transform.stream.StreamSource;
044    import org.xml.sax.InputSource;
045    import org.xml.sax.XMLReader;
046    
047    /**
048     * Specifies a SAX XML source. This is a tuple of input source and SAX
049     * parser.
050     *
051     * @author (a href='mailto:dog@gnu.org'>Chris Burdess</a)
052     */
053    public class SAXSource
054      implements Source
055    {
056    
057      /**
058       * Factory feature indicating that SAX sources are supported.
059       */
060      public static final String FEATURE =
061        "http://javax.xml.transform.sax.SAXSource/feature";
062    
063      private XMLReader  xmlReader;
064      private InputSource  inputSource;
065    
066      /**
067       * Default constructor.
068       */
069      public SAXSource()
070      {
071      }
072    
073      /**
074       * Constructor with a SAX parser and input source.
075       */
076      public SAXSource(XMLReader reader, InputSource inputSource)
077      {
078        xmlReader = reader;
079        this.inputSource = inputSource;
080      }
081    
082      /**
083       * Constructor with an input source.
084       * The SAX parser will be instantiated by the transformer.
085       */
086      public SAXSource(InputSource inputSource)
087      {
088        this.inputSource = inputSource;
089      }
090    
091      /**
092       * Sets the SAX parser to be used by this source.
093       * If null, the transformer will instantiate its own parser.
094       */
095      public void setXMLReader(XMLReader reader)
096      {
097        xmlReader = reader;
098      }
099    
100      /**
101       * Returns the SAX parser to be used by this source.
102       * If null, the transformer will instantiate its own parser.
103       */
104      public XMLReader getXMLReader()
105      {
106        return xmlReader;
107      }
108    
109      /**
110       * Sets the input source to parse.
111       */
112      public void setInputSource(InputSource inputSource)
113      {
114        this.inputSource = inputSource;
115      }
116    
117      /**
118       * Returns the input source to parse.
119       */
120      public InputSource getInputSource()
121      {
122        return inputSource;
123      }
124    
125      /**
126       * Sets the system ID for this source.
127       */
128      public void setSystemId(String systemId)
129      {
130        if (inputSource != null)
131          {
132            inputSource.setSystemId(systemId);
133          }
134      }
135    
136      /**
137       * Returns the system ID for this source.
138       */
139      public String getSystemId()
140      {
141        if (inputSource != null)
142          {
143            return inputSource.getSystemId();
144          }
145        return null;
146      }
147    
148      /**
149       * Converts a source into a SAX input source.
150       * This method can use a StreamSource or the system ID.
151       * @return an input source or null
152       */
153      public static InputSource sourceToInputSource(Source source)
154      {
155        InputSource in = null;
156        if (source instanceof SAXSource)
157          {
158            in = ((SAXSource) source).getInputSource();
159          }
160        else if (source instanceof StreamSource)
161          {
162            StreamSource streamSource = (StreamSource) source;
163            InputStream inputStream = streamSource.getInputStream();
164            if (inputStream != null)
165              {
166                in = new InputSource(inputStream);
167              }
168            else
169              {
170                Reader reader = streamSource.getReader();
171                if (reader != null)
172                  {
173                    in = new InputSource(reader);
174                  }
175              }
176            String publicId = streamSource.getPublicId();
177            if (publicId != null && in != null)
178              {
179                in.setPublicId(publicId);
180              }
181          }
182        String systemId = source.getSystemId();
183        if (systemId != null)
184          {
185            if (in == null)
186              {
187                in = new InputSource(systemId);
188              }
189            else
190              {
191                in.setSystemId(systemId);
192              }
193          }
194        return in;
195      }
196    
197    }