/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.console;

import java.io.*;
import java.util.*;
import java.security.*;

import org.osgi.framework.*;
import org.knopflerfish.service.console.*;

/**
 * Implementation of the service interface ConsoleService.
 *
 * @see org.knopflerfish.service.console.ConsoleService
 * @author  Jan Stein
 */
public class ConsoleServiceImpl implements ConsoleService {

  final BundleContext bc;

  Alias aliases;

  public ConsoleServiceImpl(BundleContext bc) {
    this.bc = bc;

    aliases = new Alias();
    aliases.setDefault();
  }

  
  public String[] setAlias(final String key, final String[] val) {
    String oldVal[] = 
      (String[])AccessController.doPrivileged( new PrivilegedAction() 
	{
	  public Object run() {
	    return aliases.put(key, (String[])val.clone());
	  }
	});

    return oldVal;
  }
  
  
  /**
   * Start a command session
   * 
   * @param command Command string to match against
   * @return Session object
   */
  public Session runSession(String      name, 
			    Reader      in, 
			    PrintWriter out) throws IOException {
    SessionImpl s = new SessionImpl(bc, name, in, out, aliases);
    s.start();
    return s;
  }


  /**
   * Run a single command
   * 
   * @param commands String with command to run
   * @return Result of commands
   */
  public String runCommand(String command) {

    Reader       in  = new StringReader(command);
    StringWriter buf = new StringWriter();
    PrintWriter  out = new PrintWriter(buf);

    try {
      (new Command(bc, "", null, SessionImpl.setupTokenizer(in), in, out, null)).run();
      out.flush();
      return buf.toString();
    } catch (IOException e) {
      return "Command failed; " + e.getMessage();
    }
  }
}