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/*
* 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 org.apache.xerces.dom;
import java.util.ArrayList;
import java.util.StringTokenizer;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.DOMImplementationList;
import org.w3c.dom.DOMImplementationSource;
/**
* Supply one the right implementation, based upon requested features. Each
* implemented DOMImplementationSource object is listed in the
* binding-specific list of available sources so that its
* DOMImplementation objects are made available.
*
* See also the Document Object Model (DOM) Level 3 Core Specification.
*
* @xerces.internal
*
* @version $Id: DOMImplementationSourceImpl.java 883487 2009-11-23 20:28:10Z knoaman $
*/
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
* null 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 ArrayList implementations = new ArrayList();
if (testImpl(impl, features)) {
implementations.add(impl);
}
impl = DOMImplementationImpl.getDOMImplementation();
if (testImpl(impl, features)) {
implementations.add(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;
}
}