taverna-scufl2-wfbundle/src/main/java/org/apache/taverna/scufl2/rdfxml/RDFXMLReader.java

package org.apache.taverna.scufl2.rdfxml;
/*
 *
 * 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.
 *
*/


import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Set;

import org.apache.taverna.scufl2.api.container.WorkflowBundle;
import org.apache.taverna.scufl2.api.io.ReaderException;
import org.apache.taverna.scufl2.api.io.WorkflowBundleReader;
import org.apache.taverna.scufl2.ucfpackage.UCFPackage;


public class RDFXMLReader implements WorkflowBundleReader {
	public static final String APPLICATION_VND_TAVERNA_SCUFL2_WORKFLOW_BUNDLE = "application/vnd.taverna.scufl2.workflow-bundle";
	public static final String APPLICATION_RDF_XML = "application/rdf+xml";

	@Override
	public Set<String> getMediaTypes() {
		return Collections.singleton(APPLICATION_VND_TAVERNA_SCUFL2_WORKFLOW_BUNDLE);
	}

	@Override
	public WorkflowBundle readBundle(File bundleFile, String mediaType)
			throws ReaderException, IOException {
		UCFPackage ucfPackage = new UCFPackage(bundleFile);
		WorkflowBundleParser deserializer = new WorkflowBundleParser();
		return deserializer.readWorkflowBundle(ucfPackage, bundleFile.toURI());
	}

	@Override
	public WorkflowBundle readBundle(InputStream inputStream, String mediaType)
			throws ReaderException, IOException {
		UCFPackage ucfPackage = new UCFPackage(inputStream);
		WorkflowBundleParser deserializer = new WorkflowBundleParser();
		return deserializer.readWorkflowBundle(ucfPackage, URI.create(""));
	}

	@Override
	public String guessMediaTypeForSignature(byte[] firstBytes) {
		if (firstBytes.length < 100)
			return null;
		Charset latin1 = Charset.forName("ISO-8859-1");
		String pk = new String(firstBytes, 0, 2, latin1);
		if (!pk.equals("PK"))
			return null;
		String mimetype = new String(firstBytes, 30, 8, latin1);
		if (!mimetype.equals("mimetype"))
			return null;
		String bundle = new String(firstBytes, 38,
				APPLICATION_VND_TAVERNA_SCUFL2_WORKFLOW_BUNDLE.length(), latin1);
		if (!bundle.equals(APPLICATION_VND_TAVERNA_SCUFL2_WORKFLOW_BUNDLE))
			return null;
		return APPLICATION_VND_TAVERNA_SCUFL2_WORKFLOW_BUNDLE;
	}
}