/*
 * GnomeElement.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 library; 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.libxmlj.dom;

import java.util.HashSet;
import java.util.Set;

import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.TypeInfo;

/**
 * A DOM element node implemented in libxml2.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
class GnomeElement
  extends GnomeNode
  implements Element
{

  /**
   * User-defined ID attributes.
   */
  Set userIdAttrs;

  GnomeElement(Object id)
  {
    super(id);
  }
  
  public String getTagName()
  {
    return getNodeName();
  }

  public native String getAttribute(String name);

  public native void setAttribute(String name, String value)
    throws DOMException;
  
  public void removeAttribute(String name)
    throws DOMException
  {
    Attr attr = getAttributeNode(name);
    if (attr != null)
      {
        removeAttributeNode(attr);
      }
  }

  public native Attr getAttributeNode(String name);
  
  public native Attr setAttributeNode(Attr newAttr)
    throws DOMException;

  public native Attr removeAttributeNode(Attr oldAttr)
    throws DOMException;

  public native NodeList getElementsByTagName(String name);
  
  public native String getAttributeNS(String namespaceURI, String localName);
  
  public native void setAttributeNS(String namespaceURI, String
                                    qualifiedName, String value)
    throws DOMException;

  public void removeAttributeNS(String namespaceURI, String localName)
    throws DOMException
  {
    Attr attr = getAttributeNodeNS(namespaceURI, localName);
    if (attr != null)
      {
        removeAttributeNode(attr);
      }
  }
  
  public native Attr getAttributeNodeNS(String namespaceURI,
                                        String localName);

  public native Attr setAttributeNodeNS(Attr newAttr)
    throws DOMException;

  public native NodeList getElementsByTagNameNS(String namespaceURI,
                                                String localName);
  
  public native boolean hasAttribute(String name);

  public native boolean hasAttributeNS(String namespaceURI,
                                       String localName);

  // DOM Level 3 methods

  public TypeInfo getSchemaTypeInfo()
  {
    return new GnomeTypeInfo(id);
  }

  public void setIdAttribute(String name, boolean isId)
  {
    Attr attr = getAttributeNode(name);
    setIdAttributeNode(attr, isId);
  }

  public void setIdAttributeNode(Attr attr, boolean isId)
  {
    if (attr == null)// FIXME || !attr.getOwnerElement().equals(this))
      {
        throw new GnomeDOMException(DOMException.NOT_FOUND_ERR, null);
      }
    if (isId)
      {
        if (userIdAttrs == null)
          {
            userIdAttrs = new HashSet();
          }
        userIdAttrs.add(attr);
      }
    else if (userIdAttrs != null)
      {
        userIdAttrs.remove(attr);
        if (userIdAttrs.isEmpty())
          {
            userIdAttrs = null;
          }
      }
  }

  public void setIdAttributeNS(String namespaceURI, String localName,
                               boolean isId)
  {
    Attr attr = getAttributeNodeNS(namespaceURI, localName);
    setIdAttributeNode(attr, isId);
  }

  public String toString()
  {
    StringBuffer buffer = new StringBuffer(getClass().getName());
    buffer.append("[tagName=");
    buffer.append(getTagName());
    buffer.append("]");
    return buffer.toString();
  }

}
