Source for javax.xml.transform.sax.SAXSource

   1: /* SAXSource.java -- 
   2:    Copyright (C) 2004, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package javax.xml.transform.sax;
  39: 
  40: import java.io.InputStream;
  41: import java.io.Reader;
  42: import javax.xml.transform.Source;
  43: import javax.xml.transform.stream.StreamSource;
  44: import org.xml.sax.InputSource;
  45: import org.xml.sax.XMLReader;
  46: 
  47: /**
  48:  * Specifies a SAX XML source. This is a tuple of input source and SAX
  49:  * parser.
  50:  *
  51:  * @author (a href='mailto:dog@gnu.org'>Chris Burdess</a)
  52:  */
  53: public class SAXSource
  54:   implements Source
  55: {
  56: 
  57:   /**
  58:    * Factory feature indicating that SAX sources are supported.
  59:    */
  60:   public static final String FEATURE =
  61:     "http://javax.xml.transform.sax.SAXSource/feature";
  62: 
  63:   private XMLReader  xmlReader;
  64:   private InputSource  inputSource;
  65: 
  66:   /**
  67:    * Default constructor.
  68:    */
  69:   public SAXSource()
  70:   {
  71:   }
  72: 
  73:   /**
  74:    * Constructor with a SAX parser and input source.
  75:    */
  76:   public SAXSource(XMLReader reader, InputSource inputSource)
  77:   {
  78:     xmlReader = reader;
  79:     this.inputSource = inputSource;
  80:   }
  81: 
  82:   /**
  83:    * Constructor with an input source.
  84:    * The SAX parser will be instantiated by the transformer.
  85:    */
  86:   public SAXSource(InputSource inputSource)
  87:   {
  88:     this.inputSource = inputSource;
  89:   }
  90: 
  91:   /**
  92:    * Sets the SAX parser to be used by this source.
  93:    * If null, the transformer will instantiate its own parser.
  94:    */
  95:   public void setXMLReader(XMLReader reader)
  96:   {
  97:     xmlReader = reader;
  98:   }
  99: 
 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: }