llvm-gcc-4.2/libjava/classpath/gnu/CORBA/GIOP/v1_2/RequestHeader.java

/* RequestHeader.java --
   Copyright (C) 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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02110-1301 USA.

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making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
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package gnu.CORBA.GIOP.v1_2;

import gnu.CORBA.Minor;
import gnu.CORBA.CDR.AbstractCdrInput;
import gnu.CORBA.CDR.AbstractCdrOutput;
import gnu.CORBA.GIOP.ServiceContext;
import gnu.CORBA.GIOP.CodeSetServiceContext;

import java.io.IOException;

import org.omg.CORBA.MARSHAL;
import org.omg.CORBA.NO_IMPLEMENT;

/**
 * The GIOP 1.2 request header. The GIOP 1.1 request header
 * is the same as GIOP 1.0 request header, if taking the
 * alignment into consideration.
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public class RequestHeader
  extends gnu.CORBA.GIOP.v1_0.RequestHeader
{
  /** 
   * Use serialVersionUID for interoperability. 
   */
  private static final long serialVersionUID = 1;
  
  /**
   * Indicates that the object is addressed by the object key.
   */
  public static final short KeyAddr = 0;

  /**
   * Indicates that the object is addressed by the IOP tagged profile.
   */
  public static final short ProfileAddr = 1;

  /**
   * Indicates that the objec is addressed by IOR addressing info.
   */
  public static final short ReferenceAddr = 2;

  /**
   * The response flags of the header. By default, the flags are initialised
   * by value 0x3 (response expected).
   */
  public byte response_flags = 3;

  /**
   * The used addressing method.
   */
  public short AddressingDisposition;

  /**
   * Adds the standard encoding context.
   */
  public RequestHeader()
  {
    service_context = new ServiceContext[] { CodeSetServiceContext.STANDARD };
  }

  /**
   * Set if the sender expects any response to this message.
   * Clears or sets the 2 lower bits of flags
   * (0 - not expected, 0x3 - expected).
   */
  public void setResponseExpected(boolean expected)
  {
    response_expected = expected;

    if (expected)
      response_flags = (byte) (response_flags | 0x3);
    else
      response_flags = (byte) (response_flags & (~0x3));
  }

  /**
   * Return true if response is expected.
   *
   * @return true if the two lowest bits of the flags are set or
   * the response expected is explicitly set to true.
   */
  public boolean isResponseExpected()
  {
    return response_expected || ((response_flags & 0x3) == 0x3);
  }

  /**
   * Read the header from the given stream.
   *
   * @param in a stream to read from.
   */
  public void read(AbstractCdrInput in)
  {
    try
      {
        request_id = in.read_ulong();
        response_flags = (byte) in.read();

        // Skip 3 reserved octets:
        in.skip(3);

        // Read target address.
        AddressingDisposition = in.read_ushort();

        switch (AddressingDisposition)
          {
            case KeyAddr :
              object_key = in.read_sequence();
              break;

            // TODO FIXME add other addressing methods.
            case ProfileAddr :
              throw new NO_IMPLEMENT("Object addressing by IOP tagged profile");

            case ReferenceAddr :
              throw new NO_IMPLEMENT("Object addressing by by IOR addressing info");

            default :
              MARSHAL m = new MARSHAL("Unknow addressing method in request, " +
                                AddressingDisposition
                               );
              m.minor = Minor.UnsupportedAddressing;
              throw m;
          }

        operation = in.read_string();
        service_context = gnu.CORBA.GIOP.ServiceContext.readSequence(in);

        // No requesting principal in this new format.
        in.setCodeSet(CodeSetServiceContext.find(service_context));
      }
    catch (IOException ex)
      {
        MARSHAL t = new MARSHAL();
        t.minor = Minor.Header;
        t.initCause(ex);
        throw t;
      }
  }

  /**
   * Return a string representation.
   */
  public String toString()
  {
    return "Request " + request_id + ", call '" + operation + "' on " +
           bytes(object_key) + ", " +
           (response_expected ? "wait response" : "one way") +
           " addressed by " + " method " + AddressingDisposition + "." +
           contexts();
  }

  /**
   * Write the header to the given stream.
   *
   * @param out a stream to write into.
   */
  public void write(AbstractCdrOutput out)
  {
    out.write_ulong(request_id);

    out.write(response_flags);

    // Skip 3 reserved octets:
    out.write(0);
    out.write(0);
    out.write(0);

    // Write addressing disposition from IOR.
    // TODO FIXME add other addressing methods.
    out.write_ushort(KeyAddr);

    out.write_sequence(object_key);

    out.write_string(operation);

    ServiceContext.writeSequence(out, service_context);

    // No requesting principal in this new format.
    out.setCodeSet(CodeSetServiceContext.find(service_context));
  }
}