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/* DomEntity.java --
   Copyright (C) 1999,2000,2004 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
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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.
 
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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
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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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
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exception statement from your version. */
 
package gnu.xml.dom;
 
import org.w3c.dom.Entity;
 
/**
 * <p> "Entity" implementation.  This is a non-core DOM class, supporting the
 * "XML" feature.  There are two types of entities, neither of which works
 * particularly well in this API:</p><dl>
 *
 * <dt><em>Unparsed Entities</em></dt>
 *      <dd>Since ENTITY/ENTITIES attributes, the only legal use of unparsed
 *      entities in XML, can't be detected with DOM, there isn't much point in
 *      trying to use unparsed entities in DOM applications.  (XML Linking is
 *      working to provide a better version of this functionality.) </dd>
 *
 * <dt><em>Parsed Entities</em></dt>
 *      <dd> While the DOM specification permits nodes for parsed entities
 *      to have a readonly set of children, this is not required and there
 *      is no portable way to provide such children.  <em>This implementation
 *      currently does not permit children to be added to Entities.</em>
 *      There are related issues with the use of EntityReference nodes.  </dd>
 *
 * </dl>
 *
 * <p> In short, <em>avoid using this DOM functionality</em>.
 *
 * @see DomDoctype
 * @see DomEntityReference
 * @see DomNotation
 *
 * @author David Brownell
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public class DomEntity
  extends DomExtern
  implements Entity
{
 
  private String notation;
 
  /**
   * Constructs an Entity node associated with the specified document,
   * with the specified descriptive data.
   *
   * <p>This constructor should only be invoked by a DomDoctype as part
   * of its declareEntity functionality, or through a subclass which is
   * similarly used in a "Sub-DOM" style layer.
   *
   * @param owner The document with which this entity is associated
   * @param name Name of this entity
   * @param publicId If non-null, provides the entity's PUBLIC identifier
   * @param systemId Provides the entity's SYSTEM identifier (URI)
   * @param notation If non-null, provides the unparsed entity's notation.
   */
  protected DomEntity(DomDocument owner,
                      String name,
                      String publicId,
                      String systemId,
                      String notation)
  {
    super(ENTITY_NODE, owner, name, publicId, systemId);
    this.notation = notation;
 
    // NOTE:  if notation == null, this is a parsed entity
    // which could reasonably be given child nodes ...
    makeReadonly();
  }
 
  /**
   * <b>DOM L1</b>
   * Returns the NOTATION identifier associated with this entity, if any.
   */
  final public String getNotationName()
  {
    return notation;
  }
 
  // DOM Level 3 methods
 
  public String getInputEncoding()
  {
    // TODO
    return null;
  }
 
  public String getXmlEncoding()
  {
    // TODO
    return null;
  }
 
  public String getXmlVersion()
  {
    // TODO
    return null;
  }
 
  /**
   * The base URI of an external entity is its system ID.
   * The base URI of an internal entity is the parent document's base URI.
   * @since DOM Level 3 Core
   */
  public String getBaseURI()
  {
    String systemId = getSystemId();
    return (systemId == null) ? owner.getBaseURI() : systemId;
  }
 
}