/* Binding.java --
   Copyright (C) 2001, 2005, 2006  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
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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 javax.naming;

/**
 * <code>Binding</code> represents the name-object mapping of a 
 * binding in a context.
 * <p>
 * Bindings are mappings of a name to an object and this class is used to
 * specify such mappings. The bindings of a context are retrieved by the
 * <code>Context#listBindings()</code> methods.
 * </p>
 * 
 * @author Tom Tromey (tromey@redhat.com)
 * @since 1.3
 */
public class Binding extends NameClassPair
{
  private static final long serialVersionUID = 8839217842691845890L;

  /**
   * Constructs an instance with the given name and object.
   * 
   * @param name the name of the binding relative to the target context
   * (may not be <code>null</code>)
   * @param obj the bound object
   */
  public Binding (String name, Object obj)
  {
    super (name, null);
    boundObj = obj;
  }

  /**
   * Constructs an instance with the given name and object and a 
   * flag indicating if the name is relative to the target context.
   * 
   * @param name the name of the binding relative to the target context
   * (may not be <code>null</code>)
   * @param obj the bound object
   * @param isRelative flag indicating if the name is relative or not
   */
  public Binding (String name, Object obj, boolean isRelative)
  {
    super (name, null, isRelative);
    boundObj = obj;
  }

  /**
   * Constructs an instance with the given name, classname and object.
   * 
   * @param name the name of the binding relative to the target context
   * (may not be <code>null</code>)
   * @param className the classname to set (maybe <code>null</code>)
   * @param obj the bound object
   */
  public Binding (String name, String className, Object obj)
  {
    super (name, className);
    boundObj = obj;
  }

  /**
   * Constructs an instance with the given name, classname, object and a 
   * flag indicating if the name is relative to the target context.
   * 
   * @param name the name of the binding relative to the target context
   * (may not be <code>null</code>)
   * @param className the classname to set (maybe <code>null</code>)
   * @param isRelative flag indicating if the name is relative or not
   * @param obj the bound object
   */
  public Binding (String name, String className, Object obj,
		  boolean isRelative)
  {
    super (name, className, isRelative);
    boundObj = obj;
  }

  /**
   * Returns the classname of the bound object.
   * <p>
   * Returns the classname if set explicitly. If not and the bound object is
   * not <code>null</code> the classname of the bound object is used.
   * </p>
   * 
   * @return The fully qualified classname (may be <code>null</code>).
   */
  public String getClassName ()
  {
    String r = super.getClassName ();
    if (r != null)
      return r;
    return boundObj == null ? null : boundObj.getClass ().getName ();
  }

  /**
   * Returns the bound object of this binding.
   * @return The bound object (maybe <code>null</code>).
   */
  public Object getObject ()
  {
    return boundObj;
  }

  /**
   * Sets the bound object of this binding.
   * @param obj the bound object.
   */
  public void setObject (Object obj)
  {
    boundObj = obj;
  }

  /**
   * Returns the string representation.
   * @return The string as given by the NameClassPair superclass plus 
   * the bound objects string representation seperated by a colon.
   */
  public String toString ()
  {
    // Format specified by the documentation.
    return super.toString () + ":" + boundObj.toString ();
  }

  // This name is fixed by the serialization spec.
  private Object boundObj;
}