content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package mf.org.apache.xerces.dom;
  
  import mf.org.w3c.dom.DOMImplementation;
  import mf.org.w3c.dom.DocumentType;
  
  /**
   * The DOMImplementation class is description of a particular
   * implementation of the Document Object Model. As such its data is
   * static, shared by all instances of this implementation.
   * <p/>
   * The DOM API requires that it be a real object rather than static
   * methods. However, there's nothing that says it can't be a singleton,
   * so that's how I've implemented it.
   *
   * @version $Id: DOMImplementationImpl.java 809736 2009-08-31 20:43:19Z mrglavas $
   * @xerces.internal
   * @since PR-DOM-Level-1-19980818.
   */
  public class DOMImplementationImpl extends CoreDOMImplementationImpl
          implements DOMImplementation {
  
      //
      // Data
      //
  
      // static
  
      /**
       * Dom implementation singleton.
       */
      static final DOMImplementationImpl singleton = new DOMImplementationImpl();
  
  
      //
      // Public methods
      //
  
      /**
       * NON-DOM: Obtain and return the single shared object
       */
      public static DOMImplementation getDOMImplementation() {
          return singleton;
      }
  
      //
      // DOMImplementation methods
      //
  
      /**
       * Test if the DOM implementation supports a specific "feature" --
       * currently meaning language and level thereof.
       *
       * @param feature The package name of the feature to test.
       *                In Level 1, supported values are "HTML" and "XML" (case-insensitive).
       *                At this writing, org.apache.xerces.dom supports only XML.
       * @param version The version number of the feature being tested.
       *                This is interpreted as "Version of the DOM API supported for the
       *                specified Feature", and in Level 1 should be "1.0"
       * @return true iff this implementation is compatable with the
       * specified feature and version.
       */
      @Override
      public boolean hasFeature(String feature, String version) {
  
          boolean result = super.hasFeature(feature, version);
          if (!result) {
              boolean anyVersion = version == null || version.length() == 0;
              if (feature.startsWith("+")) {
                  feature = feature.substring(1);
              }
              return (
                      (feature.equalsIgnoreCase("Events")
                              && (anyVersion || version.equals("2.0")))
                              || (feature.equalsIgnoreCase("MutationEvents")
                              && (anyVersion || version.equals("2.0")))
                              || (feature.equalsIgnoreCase("Traversal")
                              && (anyVersion || version.equals("2.0")))
                              || (feature.equalsIgnoreCase("Range")
                              && (anyVersion || version.equals("2.0")))
                              || (feature.equalsIgnoreCase("MutationEvents")
                              && (anyVersion || version.equals("2.0"))));
          }
          return result;
      } // hasFeature(String,String):boolean
  
      //
      // Protected methods
      //
  
      @Override
      protected CoreDocumentImpl createDocument(DocumentType doctype) {
          return new DocumentImpl(doctype);
      }
  
  } // class DOMImplementationImpl
  