/*
* 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.felix.shell.impl;
import java.io.PrintStream;
import java.util.StringTokenizer;
import org.apache.felix.shell.Command;
import org.apache.felix.shell.ShellService;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
public class HelpCommandImpl implements Command
{
private BundleContext m_context = null;
public HelpCommandImpl(BundleContext context)
{
m_context = context;
}
public String getName()
{
return "help";
}
public String getUsage()
{
return "help [<command> ...]";
}
public String getShortDescription()
{
return "display available command usage and description.";
}
public void execute(String s, PrintStream out, PrintStream err)
{
try {
// Get a reference to the impl service.
ServiceReference ref = m_context.getServiceReference(
org.apache.felix.shell.ShellService.class.getName());
if (ref != null)
{
ShellService ss = (ShellService) m_context.getService(ref);
// Parse command line.
StringTokenizer st = new StringTokenizer(s, " ");
// Ignore the command name.
st.nextToken();
if (!st.hasMoreTokens())
{
String[] cmds = ss.getCommands();
for (int i = 0; i < cmds.length; i++)
{
out.println(cmds[i]);
}
out.println("\nUse 'help <command-name>' for more information.");
}
else
{
String[] cmds = ss.getCommands();
String[] targets = new String[st.countTokens()];
for (int i = 0; i < targets.length; i++)
{
targets[i] = st.nextToken().trim();
}
boolean found = false;
for (int cmdIdx = 0; (cmdIdx < cmds.length); cmdIdx++)
{
for (int targetIdx = 0; targetIdx < targets.length; targetIdx++)
{
if (cmds[cmdIdx].equals(targets[targetIdx]))
{
if (found)
{
out.println("---");
}
found = true;
out.println("Command : "
+ cmds[cmdIdx]);
out.println("Usage : "
+ ss.getCommandUsage(cmds[cmdIdx]));
out.println("Description : "
+ ss.getCommandDescription(cmds[cmdIdx]));
}
}
}
}
}
else
{
err.println("No ShellService is unavailable.");
}
} catch (Exception ex) {
err.println(ex.toString());
}
}
}