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/* 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., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 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);

  }

}