/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* 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 net.ontopia.topicmaps.xml;
import net.ontopia.xml.ConfigurableEntityResolver;
import net.ontopia.xml.EmptyInputSourceFactory;
import net.ontopia.xml.InputSourceFactoryIF;
import org.xml.sax.InputSource;
/**
* INTERNAL: SAX entity resolver that makes sure that doctype
* declarations referencing the ISO 13250 and XTM 1.0 DTDs using
* public ids are ignored.</p>
*
* The resolver returns an empty input source for each entity with the
* public ids:</p>
*
* <pre>
* "-//TopicMaps.Org//DTD XML Topic Map (XTM) 1.0//EN"
* "+//IDN ontopia.net//DTD Topic Map Interchange Format (Strict 1.0)//EN"
* </pre>
*
* An empty input source is also used if the system_id ends with '.dtd'.</p>
*/
public class IgnoreTopicMapDTDEntityResolver extends ConfigurableEntityResolver {
protected InputSourceFactoryIF factory;
public IgnoreTopicMapDTDEntityResolver() {
this(new EmptyInputSourceFactory());
}
public IgnoreTopicMapDTDEntityResolver(InputSourceFactoryIF factory) {
this.factory = factory;
addPublicIdSource("-//TopicMaps.Org//DTD XML Topic Map (XTM) 1.0//EN", factory);
addPublicIdSource("+//IDN ontopia.net//DTD Topic Map Interchange Format (Strict 1.0)//EN", factory);
}
public InputSource resolveEntity (String public_id, String system_id) {
if (system_id != null && system_id.endsWith(".dtd"))
return factory.createInputSource();
return super.resolveEntity(public_id, system_id);
}
}