src/org/apache/osgi/bundle/shell/StartLevelCommandImpl.java

/*
 *   Copyright 2005 The Apache Software Foundation
 *
 *   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.apache.osgi.bundle.shell;

import java.io.PrintStream;
import java.util.StringTokenizer;

import org.apache.osgi.service.shell.Command;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.startlevel.StartLevel;

public class StartLevelCommandImpl implements Command
{
    private BundleContext m_context = null;

    public StartLevelCommandImpl(BundleContext context)
    {
        m_context = context;
    }

    public String getName()
    {
        return "startlevel";
    }

    public String getUsage()
    {
        return "startlevel [<level>]";
    }

    public String getShortDescription()
    {
        return "get or set framework start level.";
    }

    public void execute(String s, PrintStream out, PrintStream err)
    {
        // Get start level service.
        ServiceReference ref = m_context.getServiceReference(
            org.osgi.service.startlevel.StartLevel.class.getName());
        if (ref == null)
        {
            out.println("StartLevel service is unavailable.");
            return;
        }

        StartLevel sl = (StartLevel) m_context.getService(ref);
        if (sl == null)
        {
            out.println("StartLevel service is unavailable.");
            return;
        }

        // Parse command line.
        StringTokenizer st = new StringTokenizer(s, " ");

        // Ignore the command name.
        st.nextToken();

        if (st.countTokens() == 0)
        {
            out.println("Level " + sl.getStartLevel());
        }
        else if (st.countTokens() >= 1)
        {
            String levelStr = st.nextToken().trim();

            try {
                int level = Integer.parseInt(levelStr);
                sl.setStartLevel(level);
            } catch (NumberFormatException ex) {
                err.println("Unable to parse integer '" + levelStr + "'.");
            } catch (Exception ex) {
                err.println(ex.toString());
            }
        }
    }
}