libjava/classpath/gnu/java/beans/encoder/StAXWriter.java

   1 /* StAXWriter.java
   2  Copyright (C) 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
  39 package gnu.java.beans.encoder;
  40
  41 import java.io.OutputStream;
  42
  43 import javax.xml.stream.XMLOutputFactory;
  44 import javax.xml.stream.XMLStreamException;
  45 import javax.xml.stream.XMLStreamWriter;
  46
  47 /** A {@link Writer} implementation based on the StAX API.
  48  *
  49  * @author Robert Schuster (robertschuster@fsfe.org)
  50  *
  51  */
  52 public class StAXWriter implements Writer
  53 {
  54   XMLStreamWriter writer;
  55
  56   int indent = 0;
  57
  58   public StAXWriter(OutputStream os)
  59   {
  60     try
  61       {
  62         XMLOutputFactory factory = XMLOutputFactory.newInstance();
  63         writer = factory.createXMLStreamWriter(os);
  64       }
  65     catch (XMLStreamException se)
  66       {
  67         throw (InternalError)
  68           new InternalError(
  69           "Could not instantiate a streaming XML writer.")
  70           .initCause(se);
  71       }
  72
  73   }
  74
  75   public void flush()
  76   {
  77     if (writer != null)
  78       {
  79         try
  80           {
  81             writer.flush();
  82           }
  83         catch (XMLStreamException xse)
  84           {
  85             // TODO: find out
  86           }
  87       }
  88
  89   }
  90
  91   public void close()
  92   {
  93     if (writer != null)
  94       {
  95         try
  96           {
  97             writer.close();
  98           }
  99         catch (XMLStreamException xse)
 100           {
 101             // TODO: find out
 102           }
 103         writer = null;
 104       }
 105
 106   }
 107
 108   public void writePreamble()
 109   {
 110     try
 111       {
 112         writer.writeStartDocument("UTF-8", "1.0");
 113       }
 114     catch (XMLStreamException xmlse)
 115       {
 116
 117       }
 118   }
 119
 120   public void writeEnd(boolean wasEmpty)
 121   {
 122     try
 123       {
 124         indent -= 2;
 125
 126         if (wasEmpty)
 127           return;
 128
 129         for (int i = 0; i < indent; i++)
 130           writer.writeCharacters(" ");
 131
 132         writer.writeEndElement();
 133
 134         writer.writeCharacters("\n");
 135       }
 136     catch (XMLStreamException xmlse)
 137       {
 138
 139       }
 140   }
 141
 142   public void writeEndNoChildren()
 143   {
 144     try
 145       {
 146         writer.writeEndElement();
 147         writer.writeCharacters("\n");
 148       }
 149     catch (XMLStreamException xmlse)
 150       {
 151
 152       }
 153   }
 154
 155   public void write(String tagName, boolean empty)
 156   {
 157     write(tagName, null, null, null, empty);
 158   }
 159
 160   public void write(String tagName, String value)
 161   {
 162     write(tagName, value, null, null, value == null);
 163   }
 164
 165   public void writeNoChildren(String tagName, String value)
 166   {
 167     try
 168       {
 169         for (int i = 0; i < indent; i++)
 170           writer.writeCharacters(" ");
 171
 172         writer.writeStartElement(tagName);
 173
 174         writer.writeCharacters(value);
 175       }
 176     catch (XMLStreamException xmlse)
 177       {
 178
 179       }
 180   }
 181
 182   public void write(String tagName, String attributeName,
 183                     String attributeValue, boolean empty)
 184   {
 185     write(tagName, null, new String[] { attributeName },
 186           new String[] { attributeValue }, empty);
 187   }
 188
 189   public void write(String tagName, String value, String[] attributeNames,
 190                     String[] attributeValues, boolean empty)
 191   {
 192     try
 193       {
 194         for (int i = 0; i < indent; i++)
 195
 196           writer.writeCharacters(" ");
 197
 198         if (empty)
 199           writer.writeEmptyElement(tagName);
 200         else
 201           writer.writeStartElement(tagName);
 202
 203         if (attributeNames != null)
 204           for (int i = 0; i < attributeNames.length; i++)
 205             writer.writeAttribute(attributeNames[i], attributeValues[i]);
 206
 207         writer.writeCharacters("\n");
 208
 209         indent += 2;
 210
 211         if (value != null)
 212           {
 213             for (int i = 0; i < indent; i++)
 214               writer.writeCharacters(" ");
 215
 216             writer.writeCharacters(value);
 217
 218             writer.writeCharacters("\n");
 219           }
 220       }
 221     catch (XMLStreamException xmlse)
 222       {
 223
 224       }
 225   }
 226
 227   public void write(String tagName, String[] attributeNames,
 228                     String[] attributeValues, boolean empty)
 229   {
 230     write(tagName, null, attributeNames, attributeValues, empty);
 231   }
 232
 233 }