org.flowable.osgi.BpmnURLHandler Maven / Gradle / Ivy
/* 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 org.flowable.osgi;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.osgi.service.url.AbstractURLStreamHandlerService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A URL handler to transform a BPMN xml definition into an osgi bundle
*
* @author Guillaume Nodet
*/
public class BpmnURLHandler extends AbstractURLStreamHandlerService {
private static final Logger LOGGER = LoggerFactory.getLogger(BpmnURLHandler.class);
private static final String SYNTAX = "bpmn: bpmn-xml-uri";
private URL bpmnXmlURL;
/**
* Open the connection for the given URL.
*
* @param url
* the url from which to open a connection.
* @return a connection on the specified URL.
* @throws IOException
* if an error occurs or if the URL is malformed.
*/
@Override
public URLConnection openConnection(URL url) throws IOException {
if (url.getPath() == null || url.getPath().trim().length() == 0) {
throw new MalformedURLException("Path can not be null or empty. Syntax: " + SYNTAX);
}
bpmnXmlURL = new URL(url.getPath());
LOGGER.debug("BPMN xml URL is: [{}]", bpmnXmlURL);
return new Connection(url);
}
public URL getBpmnXmlURL() {
return bpmnXmlURL;
}
public class Connection extends URLConnection {
public Connection(URL url) {
super(url);
}
@Override
public void connect() throws IOException {
}
@Override
public InputStream getInputStream() throws IOException {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
BpmnTransformer.transform(bpmnXmlURL, os);
os.close();
return new ByteArrayInputStream(os.toByteArray());
} catch (Exception e) {
LOGGER.error("Error opening spring xml url", e);
throw (IOException) new IOException("Error opening spring xml url").initCause(e);
}
}
}
}