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/***************************************************************************
 * Copyright (c) 2004, 2005, 2006 Eike Stepper, Germany.
 * 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:
 *    Eike Stepper - initial API and implementation
 **************************************************************************/
package org.eclipse.emf.cdo.server.protocol;


import org.eclipse.net4j.signal.IndicationWithResponse;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import org.eclipse.net4j.util.stream.ExtendedDataInputStream;
import org.eclipse.net4j.util.stream.ExtendedDataOutputStream;

import org.eclipse.emf.cdo.core.CDOSignals;
import org.eclipse.emf.cdo.server.Mapper;
import org.eclipse.emf.cdo.server.ResourceInfo;
import org.eclipse.emf.cdo.server.ResourceManager;
import org.eclipse.emf.cdo.server.internal.CDOServer;

import java.io.IOException;


/**
 * @author Eike Stepper
 */
public class ResourceRIDIndication extends IndicationWithResponse
{
  private static final ContextTracer TRACER = new ContextTracer(CDOServer.DEBUG_PROTOCOL,
      ResourceRIDIndication.class);

  private Mapper mapper;

  private int rid;

  public ResourceRIDIndication(Mapper mapper)
  {
    this.mapper = mapper;
  }

  @Override
  protected short getSignalID()
  {
    return CDOSignals.RESOURCE_RID;
  }

  @Override
  protected void indicating(ExtendedDataInputStream in) throws IOException
  {
    rid = in.readInt();
    if (TRACER.isEnabled())
    {
      TRACER.trace("Requested rid " + rid);
    }
  }

  @Override
  protected void responding(ExtendedDataOutputStream out) throws IOException
  {
    ResourceManager resourceManager = mapper.getResourceManager();
    ResourceInfo info = resourceManager.getResourceInfo(rid, mapper);
    if (info == null)
    {
      if (TRACER.isEnabled())
      {
        TRACER.trace("No resource with rid " + rid);
      }

      out.writeString(null);
    }
    else
    {
      if (TRACER.isEnabled())
      {
        TRACER.trace("Responding path " + info.getPath());
      }

      out.writeString(info.getPath());
    }
  }
}