| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.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; |
| import com.sun.org.apache.xerces.internal.dom.DOMImplementationListImpl; |
| |
| /** |
| * 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; |
| } |
| } |