/*
* 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.tika.parser;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import org.apache.tika.config.ServiceLoader;
import org.apache.tika.mime.MediaType;
import org.apache.tika.mime.MediaTypeRegistry;
/**
* A composite parser based on all the {@link Parser} implementations
* available through the
* {@link javax.imageio.spi.ServiceRegistry service provider mechanism}.
*
* @since Apache Tika 0.8
*/
public class DefaultParser extends CompositeParser {
/** Serial version UID */
private static final long serialVersionUID = 3612324825403757520L;
/**
* Finds all statically loadable parsers and sort the list by name,
* rather than discovery order. CompositeParser takes the last
* parser for any given media type, so put the Tika parsers first
* so that non-Tika (user supplied) parsers can take precedence.
*
* @param loader service loader
* @return ordered list of statically loadable parsers
*/
private static List<Parser> getDefaultParsers(ServiceLoader loader) {
List<Parser> parsers =
loader.loadStaticServiceProviders(Parser.class);
Collections.sort(parsers, new Comparator<Parser>() {
public int compare(Parser p1, Parser p2) {
String n1 = p1.getClass().getName();
String n2 = p2.getClass().getName();
boolean t1 = n1.startsWith("org.apache.tika.");
boolean t2 = n2.startsWith("org.apache.tika.");
if (t1 == t2) {
return n1.compareTo(n2);
} else if (t1) {
return -1;
} else {
return 1;
}
}
});
return parsers;
}
private transient final ServiceLoader loader;
public DefaultParser(MediaTypeRegistry registry, ServiceLoader loader) {
super(registry, getDefaultParsers(loader));
this.loader = loader;
}
public DefaultParser(MediaTypeRegistry registry, ClassLoader loader) {
this(registry, new ServiceLoader(loader));
}
public DefaultParser(ClassLoader loader) {
this(MediaTypeRegistry.getDefaultRegistry(), new ServiceLoader(loader));
}
public DefaultParser(MediaTypeRegistry registry) {
this(registry, new ServiceLoader());
}
public DefaultParser() {
this(MediaTypeRegistry.getDefaultRegistry());
}
@Override
public Map<MediaType, Parser> getParsers(ParseContext context) {
Map<MediaType, Parser> map = super.getParsers(context);
if (loader != null) {
// Add dynamic parser service (they always override static ones)
MediaTypeRegistry registry = getMediaTypeRegistry();
for (Parser parser
: loader.loadDynamicServiceProviders(Parser.class)) {
for (MediaType type : parser.getSupportedTypes(context)) {
map.put(registry.normalize(type), parser);
}
}
}
return map;
}
}