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 java.util.ArrayList;
  
  import mf.org.apache.xerces.impl.xs.XSImplementationImpl;
  import mf.org.w3c.dom.DOMImplementation;
  import mf.org.w3c.dom.DOMImplementationList;
  
  
  /**
   * Allows to retrieve <code>XSImplementation</code>, DOM Level 3 Core and LS implementations
   * and PSVI implementation.
   * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#DOMImplementationSource'>Document Object Model (DOM) Level 3 Core Specification</a>.
   *
   * @author Elena Litani, IBM
   * @version $Id: DOMXSImplementationSourceImpl.java 603686 2007-12-12 17:51:23Z mrglavas $
   * @xerces.internal
   */
  public class DOMXSImplementationSourceImpl
          extends DOMImplementationSourceImpl {
  
      /**
       * A method to request a DOM implementation.
       *
       * @param features A string that specifies which features are required.
       *                 This is a space separated list in which each feature is specified
       *                 by its name optionally followed by a space and a version number.
       *                 This is something like: "XML 1.0 Traversal Events 2.0"
       * @return An implementation that has the desired features, or
       * <code>null</code> if this source has none.
       */
      @Override
      public DOMImplementation getDOMImplementation(String features) {
          DOMImplementation impl = super.getDOMImplementation(features);
          if (impl != null) {
              return impl;
          }
          // if not try the PSVIDOMImplementation
          impl = PSVIDOMImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
              return impl;
          }
          // if not try the XSImplementation
          impl = XSImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
              return impl;
          }
  
          return null;
      }
  
      /**
       * A method to request a list of DOM implementations that support the
       * specified features and versions, as specified in .
       *
       * @param features A string that specifies which features and versions
       *                 are required. This is a space separated list in which each feature
       *                 is specified by its name optionally followed by a space and a
       *                 version number. This is something like: "XML 3.0 Traversal +Events
       *                 2.0"
       * @return A list of DOM implementations that support the desired
       * features.
       */
      @Override
      public DOMImplementationList getDOMImplementationList(String features) {
          final ArrayList implementations = new ArrayList();
  
          // first check whether the CoreDOMImplementation would do
          DOMImplementationList list = super.getDOMImplementationList(features);
          // Add core DOMImplementations
          for (int i = 0; i < list.getLength(); ++i) {
              implementations.add(list.item(i));
          }
  
          DOMImplementation impl = PSVIDOMImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
              implementations.add(impl);
          }
  
          impl = XSImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
              implementations.add(impl);
          }
          return new DOMImplementationListImpl(implementations);
      }
  }
  