/*
 * Copyright (c) 2003-2004, 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.cm;

import org.knopflerfish.service.log.*;

import org.osgi.service.cm.*;
import org.osgi.framework.*;
import java.io.*;

/**
 * CM bundle activator implementation
 *
 * @author Per Gustafson
 * @version $Revision: 1.1.1.1 $
 */

public class Activator implements BundleActivator {
  private static final String STORE_DIR_PROP = "com.gatespace.bundle.cm.store";
  private static final String DEFAULT_STORE_DIR = "cm_store";
  
  static BundleContext bc;
  static LogRef log;
  
  private ServiceRegistration serviceRegistration;

  static boolean R3_TESTCOMPLIANT = false;

  public void start(BundleContext bc) throws BundleException {
    this.bc = bc;
    
    R3_TESTCOMPLIANT = "true".equals(System.getProperty("org.knopflerfish.osgi.r3.testcompliant", "false").toLowerCase());
    
    throwIfBundleContextIsNull();
    createLogRef();
    createAndRegisterConfigurationAdminFactory();
  }

  public void stop(BundleContext bc) throws BundleException {
    unregisterConfigurationAdminFactory();
    closeLogRef();
  }

  private void createLogRef() {
    throwIfBundleContextIsNull();
    log = new LogRef(bc);
  }

  private void closeLogRef() {
    if(log != null) {
      log.close();
      log = null;
    }
  }

  private void createAndRegisterConfigurationAdminFactory() {
    throwIfBundleContextIsNull();
    File storeDir = getStoreDir();
    serviceRegistration =
      bc.registerService( ConfigurationAdmin.class.getName(),
                          new ConfigurationAdminFactory(storeDir),
                          null);
  }

  private void unregisterConfigurationAdminFactory() {
    if(serviceRegistration !=  null) {
      serviceRegistration.unregister();
      serviceRegistration = null;
    }
  }


  private File getStoreDir() {
    throwIfBundleContextIsNull();
    String storeDirName = System.getProperty(STORE_DIR_PROP);
    File storeDir = null;
    if(storeDirName == null || "".equals(storeDirName)) {
      storeDir = bc.getDataFile(DEFAULT_STORE_DIR);
    } else {
      storeDir = new File(storeDirName);
    }
    return storeDir;
  }

  private void throwIfBundleContextIsNull() {
    if(bc == null) {
      throw new NullPointerException("Null BundleContext in Activator");
    }
  }

  static boolean r3TestCompliant() {
    return R3_TESTCOMPLIANT;
  }
}