content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE 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 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001, 2002,2004 The Apache Software Foundation.
   *
   * Licensed 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 jaxp.sun.org.apache.xerces.internal.dom;
  
  import java.util.StringTokenizer;
  import java.util.Vector;
  import org.w3c.dom.DOMImplementationList;
  import org.w3c.dom.DOMImplementationSource;
  import org.w3c.dom.DOMImplementation;
  
  /**
   * Supply one the right implementation, based upon requested features. Each
   * implemented <code>DOMImplementationSource</code> object is listed in the
   * binding-specific list of available sources so that its
   * <code>DOMImplementation</code> objects are made available.
   *
   * <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>.
   *
   * @xerces.internal
   *
   */
  public class DOMImplementationSourceImpl
      implements DOMImplementationSource {
  
      /**
       * 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.
       */
      public DOMImplementation getDOMImplementation(String features) {
          // first check whether the CoreDOMImplementation would do
          DOMImplementation impl =
              CoreDOMImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
              return impl;
          }
          // if not try the DOMImplementation
          impl = DOMImplementationImpl.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.
       */
      public DOMImplementationList getDOMImplementationList(String features) {
          // first check whether the CoreDOMImplementation would do
          DOMImplementation impl = CoreDOMImplementationImpl.getDOMImplementation();
                  final Vector implementations = new Vector();
          if (testImpl(impl, features)) {
                          implementations.addElement(impl);
          }
          impl = DOMImplementationImpl.getDOMImplementation();
          if (testImpl(impl, features)) {
                          implementations.addElement(impl);
          }
  
          return new DOMImplementationListImpl(implementations);
      }
  
      boolean testImpl(DOMImplementation impl, String features) {
  
          StringTokenizer st = new StringTokenizer(features);
          String feature = null;
          String version = null;
  
          if (st.hasMoreTokens()) {
             feature = st.nextToken();
          }
          while (feature != null) {
             boolean isVersion = false;
             if (st.hasMoreTokens()) {
                 char c;
                 version = st.nextToken();
                 c = version.charAt(0);
                 switch (c) {
                 case '0': case '1': case '2': case '3': case '4':
                 case '5': case '6': case '7': case '8': case '9':
                     isVersion = true;
                 }
             } else {
                 version = null;
             }
             if (isVersion) {
                 if (!impl.hasFeature(feature, version)) {
                     return false;
                 }
                 if (st.hasMoreTokens()) {
                     feature = st.nextToken();
                 } else {
                     feature = null;
                 }
             } else {
                 if (!impl.hasFeature(feature, null)) {
                     return false;
                 }
                 feature = version;
             }
          }
          return true;
      }
  }
  