/*
 * DomDocumentConfiguration.java
 * Copyright (C) 2004 The Free Software Foundation
 * 
 * This file is part of GNU JAXP, a library.
 *
 * GNU JAXP 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 of the License, or
 * (at your option) any later version.
 * 
 * GNU JAXP 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 this program; 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
 * obliged to do so.  If you do not wish to do so, delete this
 * exception statement from your version. 
 */

package gnu.xml.dom;

import java.util.Arrays;
import java.util.List;
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.DOMErrorHandler;
import org.w3c.dom.DOMException;
import org.w3c.dom.DOMStringList;

/**
 * Document configuration, used to store normalization and other parameters.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
class DomDocumentConfiguration
  implements DOMConfiguration, DOMStringList
{

  private static final List SUPPORTED_PARAMETERS =
    Arrays.asList(new String[] { "cdata-sections",
                  "comments",
                  "element-content-whitespace",
                  "entities",
                  "error-handler",
                  "namespace-declarations",
                  "split-cdata-sections",
                  "infoset"});

  boolean cdataSections = true;
  boolean comments = true;
  boolean elementContentWhitespace = true;
  boolean entities = true;
  DOMErrorHandler errorHandler;
  boolean namespaceDeclarations = true;
  boolean splitCdataSections = true;

  public void setParameter(String name, Object value)
    throws DOMException
  {
    name = name.toLowerCase();
    if ("cdata-sections".equals(name))
      {
        cdataSections = "true".equals(value.toString());
      }
    else if ("comments".equals(name))
      {
        comments = "true".equals(value.toString());
      }
    else if ("element-content-whitespace".equals(name))
      {
        elementContentWhitespace = "true".equals(value.toString());
      }
    else if ("entities".equals(name))
      {
        entities = "true".equals(value.toString());
      }
    else if ("error-handler".equals(name))
      {
        try
          {
            errorHandler = (DOMErrorHandler) value;
          }
        catch (ClassCastException e)
          {
            throw new DomEx(DomEx.TYPE_MISMATCH_ERR,
                            value.getClass().getName(), null, 0);
          }
      }
    else if ("namespace-declarations".equals(name))
      {
        namespaceDeclarations = "true".equals(value.toString());
      }
    else if ("split-cdata-sections".equals(name))
      {
        comments = "true".equals(value.toString());
      }
    else if ("infoset".equals(name))
      {
        if ("true".equals(value.toString()))
          {
            entities = false;
            cdataSections = false;
            namespaceDeclarations = true;
            elementContentWhitespace = true;
            comments = true;
          }
      }
    else if (("canonical-form".equals(name) ||
              "check-character-normalization".equals(name) ||
              "datatype-normalization".equals(name) ||
              "normalize-characters".equals(name) ||
              "validate".equals(name) ||
              "validate-if-schema".equals(name)) &&
             "false".equals(value.toString()))
      {
        // NOOP
      }
    else if (("namespaces".equals(name) ||
              "well-formed".equals(name)) &&
             "true".equals(value.toString()))
      {
        // NOOP
      }
    else
      {
        throw new DomEx(DomEx.NOT_SUPPORTED_ERR, name, null, 0);
      }
  }

  public Object getParameter(String name)
    throws DOMException
  {
    name = name.toLowerCase();
    if ("cdata-sections".equals(name))
      {
        return cdataSections ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("comments".equals(name))
      {
        return comments ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("element-content-whitespace".equals(name))
      {
        return elementContentWhitespace ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("entities".equals(name))
      {
        return entities ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("error-handler".equals(name))
      {
        return errorHandler;
      }
    else if ("namespace-declarations".equals(name))
      {
        return namespaceDeclarations ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("split-cdata-sections".equals(name))
      {
        return comments ? Boolean.TRUE : Boolean.FALSE;
      }
    else if ("canonical-form".equals(name) ||
             "check-character-normalization".equals(name) ||
             "datatype-normalization".equals(name) ||
             "normalize-characters".equals(name) ||
             "validate".equals(name) ||
             "validate-if-schema".equals(name))
      {
        return Boolean.FALSE;
      }
    else if ("namespaces".equals(name) ||
             "well-formed".equals(name))
      {
        return Boolean.TRUE;
      }
    else if ("infoset".equals(name))
      {
        return (entities == false &&
            cdataSections == false &&
            namespaceDeclarations == true &&
            comments == true) ? Boolean.TRUE : Boolean.FALSE;
      }
    throw new DomEx(DomEx.NOT_SUPPORTED_ERR, name, null, 0);
  }

  public boolean canSetParameter(String name, Object value)
  {
    name = name.toLowerCase();
    if ("error-handler".equals(name))
      {
        return (value == null || value instanceof DOMErrorHandler);
      }
    else if (contains(name))
      {
        return true;
      }
    else if ("canonical-form".equals(name) ||
             "check-character-normalization".equals(name) ||
             "datatype-normalization".equals(name) ||
             "normalize-characters".equals(name) ||
             "validate".equals(name) ||
             "validate-if-schema".equals(name))
      {
        return "false".equals(value.toString());
      }
    else if ("namespaces".equals(name) ||
             "well-formed".equals(name))
      {
        return "true".equals(value.toString());
      }
    return false;
  }

  public DOMStringList getParameterNames()
  {
    return this;
  }

  public String item(int i)
  {
    try
      {
        return (String) SUPPORTED_PARAMETERS.get(i);
      }
    catch (IndexOutOfBoundsException e)
      {
        return null;
      }
  }
  
  public int getLength()
  {
    return SUPPORTED_PARAMETERS.size();
  }
  
  public boolean contains(String str)
  {
    str = str.toLowerCase();
    return SUPPORTED_PARAMETERS.contains(str);
  }

}
