/**
* 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.hadoop.gateway.descriptor;
import org.apache.hadoop.gateway.descriptor.impl.GatewayDescriptorImpl;
import org.apache.hadoop.gateway.descriptor.xml.XmlGatewayDescriptorExporter;
import org.apache.hadoop.gateway.descriptor.xml.XmlGatewayDescriptorImporter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public abstract class GatewayDescriptorFactory {
private static Map<String, GatewayDescriptorImporter> IMPORTERS = loadImporters();
private static Map<String, GatewayDescriptorExporter> EXPORTERS = loadExporters();
public static GatewayDescriptor create() {
return new GatewayDescriptorImpl();
}
public static GatewayDescriptor load( String format, Reader reader ) throws IOException {
GatewayDescriptorImporter importer = IMPORTERS.get( format );
if( importer == null ) {
throw new IllegalArgumentException( "No importer for descriptor format " + format );
}
return importer.load( reader );
}
public static void store( GatewayDescriptor descriptor, String format, Writer writer ) throws IOException {
GatewayDescriptorExporter exporter = EXPORTERS.get( format );
if( exporter == null ) {
throw new IllegalArgumentException( "No exporter for descriptor format " + format );
}
exporter.store( descriptor, writer );
}
private static Map<String, GatewayDescriptorImporter> loadImporters() {
Map<String, GatewayDescriptorImporter> map = new ConcurrentHashMap<String, GatewayDescriptorImporter>();
map.put( "xml", new XmlGatewayDescriptorImporter() );
return map;
}
private static Map<String, GatewayDescriptorExporter> loadExporters() {
Map<String, GatewayDescriptorExporter> map = new ConcurrentHashMap<String, GatewayDescriptorExporter>();
map.put( "xml", new XmlGatewayDescriptorExporter() );
return map;
}
}