Configuration.java

/*******************************************************************************
 * Copyright (c) 2012,2015 EclipseSource and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Holger Staudacher - initial API and implementation, ongoing development
 *    ProSyst Software GmbH. - compatibility with OSGi specification 4.2 APIs
 ******************************************************************************/
package com.eclipsesource.jaxrs.publisher.internal;

import java.util.Dictionary;

import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedService;


@SuppressWarnings( "rawtypes" )
public class Configuration implements ManagedService {

  static final String CONFIG_SERVICE_PID = "com.eclipsesource.jaxrs.connector";
  static final String PROPERTY_ROOT = "root";
  static final String PROPERTY_PUBLISH_DELAY = "publishDelay";
  static final long DEFAULT_PUBLISH_DELAY = 150;

  private final JAXRSConnector connector;
  private long publishDelay;
  private String rootPath;

  public Configuration( JAXRSConnector jaxRsConnector ) {
    this.connector = jaxRsConnector;
    this.publishDelay = DEFAULT_PUBLISH_DELAY;
  }

  @Override
  public void updated( Dictionary properties ) throws ConfigurationException {
    if( properties != null ) {
      Object root = properties.get( PROPERTY_ROOT );
      ensureRootIsPresent( root );
      String rootPath = ( String )root;
      ensureRootIsValid( rootPath );
      this.rootPath = rootPath;
      this.publishDelay = getPublishDelay( properties );
      connector.updateConfiguration( this );
    }
  }

  private void ensureRootIsValid( String rootPath ) throws ConfigurationException {
    if( !rootPath.startsWith( "/" ) ) {
      throw new ConfigurationException( PROPERTY_ROOT, "Root path does not start with a /" );
    }
  }

  private void ensureRootIsPresent( Object root ) throws ConfigurationException {
    if( root == null || !( root instanceof String ) ) {
      throw new ConfigurationException( PROPERTY_ROOT, "Property is not set or invalid." );
    }
  }

  private long getPublishDelay( Dictionary properties ) {
    Object interval = properties.get( PROPERTY_PUBLISH_DELAY );
    if( interval == null ){
      return DEFAULT_PUBLISH_DELAY;
    }
    return ( ( Long )interval );
  }

  public long getPublishDelay() {
    return publishDelay;
  }

  public String getRoothPath() {
    return rootPath == null ? "/services" : rootPath;
  }

}