/* _PolicyImplBase.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.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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this exception to your version of the library, but you are not
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exception statement from your version. */


package gnu.CORBA;

import org.omg.CORBA.BAD_OPERATION;
import org.omg.CORBA.CompletionStatus;
import org.omg.CORBA.Policy;
import org.omg.CORBA.PolicyHelper;
import org.omg.CORBA.portable.InputStream;
import org.omg.CORBA.portable.InvokeHandler;
import org.omg.CORBA.portable.ObjectImpl;
import org.omg.CORBA.portable.OutputStream;
import org.omg.CORBA.portable.ResponseHandler;

/**
 * The server side implementation base for the {@link Policy}.
 *
 * @specnote The java 1.4 API does not define the server side policy
 * implementation base, but it defines the policy client side stub.
 * As these two classes always work together, and even no separate testing is
 * possible, the required implementation base is provided in gnu.CORBA
 * namespace. Sun will probably include they base in the future java APIs.
 *
 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
 */
public abstract class _PolicyImplBase
  extends ObjectImpl
  implements Policy, InvokeHandler
{
  /**
   * Use serialVersionUID for interoperability.
   */
  private static final long serialVersionUID = 1;

  /**
   * The policy repository ids.
   */
  private final String[] ids;

  /**
   * The type of this policy.
   */
  private final int type;

  /**
   * The value of this policy. The value object is never the same
   * for different policies.
   */
  private final java.lang.Object value;

  /**
   * The policy integer code, written in request to write
   * the policy value.
   */
  private final int policyCode;

  /**
   * Create the new policy of the given type, having the given value.
   * For security reasons, the method is kept package private.
   *
   * @param p_type the type of this policy.
   * @param p_value the value of this policy.
   * @param p_code the integer code of this policy.
   * @param p_idl the policy IDL type string. The {@link #_ids()}
   * will return array, first line being this string and another
   * being PolicyHelper.id().
   */
  public _PolicyImplBase(int p_type, java.lang.Object p_value, int p_code,
                         String p_idl
                        )
  {
    type = p_type;
    value = p_value;
    policyCode = p_code;
    ids = new String[] { p_idl, PolicyHelper.id() };
  }

  /**
   * Get the integer code of the type of this policy.
   */
  public final int policy_type()
  {
    return type;
  }

  /**
   * Return the list of repository ids.
   */
  public final String[] _ids()
  {
    return ids;
  }

  /**
   * Call the required method.
   */
  public final OutputStream _invoke(String method, InputStream input,
                                    ResponseHandler rh
                                   )
  {
    OutputStream output = null;

    if (method.equals("destroy"))
      {
        // The "destroy" has been invoked.
        destroy();
        output = rh.createReply();
      }
    else if (method.equals("copy"))
      {
        // The "copy" has been invoked.
        org.omg.CORBA.Object returns = copy();
        output = rh.createReply();
        output.write_Object(this);
      }
    else if (method.equals("policy_type"))
      {
        // The "policy_type" has been invoked.
        int returns = policy_type();
        output = rh.createReply();
        output.write_long(returns);
      }
    else if (method.equals("value"))
      {
        // The "value" can be invoked on the children types
        // and must return an integer, representing the policy value
        // (CORBA enumeration).
        output = rh.createReply();
        output.write_long(policyCode);
      }
    else
      throw new BAD_OPERATION(method, Minor.Method, 
        CompletionStatus.COMPLETED_MAYBE);

    return output;
  }

  /**
   * Get the value of this policy
   */
  public final java.lang.Object getValue()
  {
    return value;
  }

  /**
   * Get the integer code of this policy value.
   */
  public final int getCode()
  {
    return policyCode;
  }

  /**
   * Returns without action. It is a work of garbage collector
   * to remove the unused objects.
   */
  public final void destroy()
  {
  }

  /**
   * Returns the string representation of the given policy.
   */
  public final String toString()
  {
    return value.toString();
  }

  /**
   * Create a copy of this policy. The object is not mutable, so
   * <code>this</code> can be returned.
   *
   * @return <code>this</code>
   */
  public Policy copy()
  {
    return this;
  }

  /**
   * Use the value to get a hash code.
   */
  public int hashCode()
  {
    return getValue().hashCode();
  }

  /**
   * Check the values for equality.
   */
  public boolean equals(Object x)
  {
    return x == null ? false : getValue().equals(x);
  }
}