/* DomLSSerializer.java -- 
   Copyright (C) 1999,2000,2001 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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 gnu.xml.dom.ls;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;
import java.util.List;
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.DOMException;
import org.w3c.dom.DOMStringList;
import org.w3c.dom.Node;
import org.w3c.dom.ls.LSException;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
import org.w3c.dom.ls.LSSerializerFilter;
import org.w3c.dom.traversal.NodeFilter;
import gnu.xml.dom.DomDOMException;
import gnu.xml.transform.StreamSerializer;

/**
 * Serialize a DOM node to a stream.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public class DomLSSerializer
  extends StreamSerializer
  implements LSSerializer, DOMConfiguration, DOMStringList
{

  private static final List SUPPORTED_PARAMETERS =
    Arrays.asList(new String[] {"discard-default-content",
                  "xml-declaration"});

  private LSSerializerFilter filter;
  private StreamSerializer serializer;

  public DomLSSerializer()
  {
    super();
    discardDefaultContent = true;
  }

  // -- LSSerializer --
  
  public DOMConfiguration getDomConfig()
  {
    return this;
  }

  public String getNewLine()
  {
    return eol;
  }

  public void setNewLine(String newLine)
  {
    if (newLine == null)
      {
        newLine = System.getProperty("line.separator");
      }
    eol = newLine;
  }

  public LSSerializerFilter getFilter()
  {
    return filter;
  }

  public void setFilter(LSSerializerFilter filter)
  {
    this.filter = filter;
  }

  public boolean write(Node node, LSOutput output)
    throws LSException
  {
    OutputStream out = output.getByteStream();
    try
      {
        if (out == null)
          {
            String systemId = output.getSystemId();
            try
              {
                URL url = new URL(systemId);
                URLConnection connection = url.openConnection();
                connection.setDoOutput(true);
                if (connection instanceof HttpURLConnection)
                  {
                    ((HttpURLConnection) connection).setRequestMethod("PUT");
                  }
                out = connection.getOutputStream();
              }
            catch (MalformedURLException e)
              {
                File file = new File(systemId);
                out = new FileOutputStream(file);
              }
          }
        serialize(node, out);
        out.flush();
        return true;
      }
    catch (IOException e)
      {
        throw new DomLSException(LSException.SERIALIZE_ERR, e);
      }
  }

  public boolean writeToURI(Node node, String uri)
    throws LSException
  {
    LSOutput output = new DomLSOutput();
    output.setSystemId(uri);
    return write(node, output);
  }

  public String writeToString(Node node)
    throws DOMException, LSException
  {
    Writer writer = new StringWriter();
    LSOutput output = new DomLSOutput();
    output.setCharacterStream(writer);
    write(node, output);
    return writer.toString();
  }

  public void serialize(Node node, OutputStream out)
    throws IOException
  {
    if (filter == null)
      {
        super.serialize(node, out);
      }
    else
      {
        int wts = filter.getWhatToShow();
        if (wts != NodeFilter.SHOW_ALL)
          {
            switch (node.getNodeType())
              {
              case Node.ATTRIBUTE_NODE:
                if ((wts & NodeFilter.SHOW_ATTRIBUTE) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.TEXT_NODE:
                if ((wts & NodeFilter.SHOW_TEXT) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.ELEMENT_NODE:
                if ((wts & NodeFilter.SHOW_ELEMENT) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.CDATA_SECTION_NODE:
                if ((wts & NodeFilter.SHOW_CDATA_SECTION) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.COMMENT_NODE:
                if ((wts & NodeFilter.SHOW_COMMENT) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.DOCUMENT_NODE:
                if ((wts & NodeFilter.SHOW_DOCUMENT) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.DOCUMENT_TYPE_NODE:
                if ((wts & NodeFilter.SHOW_DOCUMENT_TYPE) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.PROCESSING_INSTRUCTION_NODE:
                if ((wts & NodeFilter.SHOW_PROCESSING_INSTRUCTION) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.DOCUMENT_FRAGMENT_NODE:
                if ((wts & NodeFilter.SHOW_DOCUMENT_FRAGMENT) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.ENTITY_NODE:
                if ((wts & NodeFilter.SHOW_ENTITY) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.ENTITY_REFERENCE_NODE:
                if ((wts & NodeFilter.SHOW_ENTITY_REFERENCE) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              case Node.NOTATION_NODE:
                if ((wts & NodeFilter.SHOW_NOTATION) == 0)
                  {
                    super.serialize(node, out);
                    return;
                  }
                break;
              }
          }
        switch (filter.acceptNode(node))
          {
          case NodeFilter.FILTER_ACCEPT:
            super.serialize(node, out);
            break;
          case NodeFilter.FILTER_REJECT:
            break;
          case NodeFilter.FILTER_SKIP:
            Node first = node.getFirstChild();
            if (first != null)
              {
                serialize(first, out);
              }
            break;
          }
      }
  }

  // -- DOMConfiguration --

  public void setParameter(String name, Object value)
    throws DOMException
  {
    if ("discard-default-content".equals(name))
      {
        discardDefaultContent = "true".equals(value.toString());
      }
    else if ("xml-declaration".equals(name))
      {
        xmlDeclaration = "false".equals(value.toString());
      }
    else
      {
        throw new DomDOMException(DOMException.NOT_SUPPORTED_ERR);
      }
  }

  public Object getParameter(String name)
    throws DOMException
  {
    if ("discard-default-content".equals(name))
      {
        return discardDefaultContent ? "true" : "false";
      }
    else if ("xml-declaration".equals(name))
      {
        return xmlDeclaration ? "true" : "false";
      }
    else
      {
        throw new DomDOMException(DOMException.NOT_SUPPORTED_ERR);
      }
  }

  public boolean canSetParameter(String name, Object value)
  {
    return contains(name);
  }

  public DOMStringList getParameterNames()
  {
    return this;
  }

  // -- DOMStringList --

  public String item(int i)
  {
    return (String) SUPPORTED_PARAMETERS.get(i);
  }

  public int getLength()
  {
    return SUPPORTED_PARAMETERS.size();
  }

  public boolean contains(String str)
  {
    return SUPPORTED_PARAMETERS.contains(str);
  }
  
}