/**
*
* 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.karaf.shell.impl.console.commands.help;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.apache.karaf.shell.api.console.Session;
public class SingleCommandHelpProvider implements HelpProvider {
public String getHelp(Session session, String path) {
if (path.indexOf('|') > 0) {
if (path.startsWith("command|")) {
path = path.substring("command|".length());
} else {
return null;
}
}
String resolved = session.resolveCommand(path);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos, true);
Session s = session.getFactory().create(null, ps, ps);
s.put(Session.SCOPE, session.get(Session.SCOPE));
s.put(Session.SUBSHELL, session.get(Session.SUBSHELL));
try {
s.execute(path + " --help");
} catch (Throwable t) {
return null;
} finally {
s.close();
}
return baos.toString();
}
}