/*
 * @(#)CannotProceedException.java	1.7 01/02/09
 *
 * Copyright 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package javax.naming;

import java.util.Hashtable;

/**
  * This exception is thrown to indicate that the operation reached 
  * a point in the name where the operation cannot proceed any further.
  * When performing an operation on a composite name, a naming service
  * provider may reach a part of the name that does not belong to its
  * namespace.  At that point, it can construct a
  * CannotProceedException and then invoke methods provided by
  * javax.naming.spi.NamingManager (such as getContinuationContext())
  * to locate another provider to continue the operation.  If this is
  * not possible, this exception is raised to the caller of the
  * context operation.
  *<p>
  * If the program wants to handle this exception in particular, it
  * should catch CannotProceedException explicitly before attempting to
  * catch NamingException.
  *<p>
  * A CannotProceedException instance is not synchronized against concurrent 
  * multithreaded access. Multiple threads trying to access and modify
  * CannotProceedException should lock the object.
  *
  * @author Rosanna Lee
  * @author Scott Seligman
  * @version 1.7 01/02/09
  * @since 1.3
  */

/*
  * The serialized form of a CannotProceedException object consists of
  * the serialized fields of its NamingException superclass, the remaining new
  * name (a Name object), the environment (a Hashtable), the altName field
  * (a Name object), and the serialized form of the altNameCtx field.
  */


public class CannotProceedException extends NamingException {
    /**
     * Contains the remaining unresolved part of the second
     * "name" argument to Context.rename().
     * This information necessary for
     * continuing the Context.rename() operation.
     * <p>
     * This field is initialized to null.
     * It should not be manipulated directly:  it should
     * be accessed and updated using getRemainingName() and setRemainingName().
     * @serial
     *
     * @see #getRemainingNewName
     * @see #setRemainingNewName
     */
    protected Name remainingNewName = null;

    /**
     * Contains the environment
     * relevant for the Context or DirContext method that cannot proceed.
     * <p>
     * This field is initialized to null.
     * It should not be manipulated directly:  it should be accessed
     * and updated using getEnvironment() and setEnvironment().
     * @serial
     *
     * @see #getEnvironment
     * @see #setEnvironment
     */
    protected Hashtable environment = null;

    /**
     * Contains the name of the resolved object, relative
     * to the context <code>altNameCtx</code>.  It is a composite name.
     * If null, then no name is specified.
     * See the <code>javax.naming.spi.ObjectFactory.getObjectInstance</code>
     * method for details on how this is used.
     * <p>
     * This field is initialized to null.
     * It should not be manipulated directly:  it should
     * be accessed and updated using getAltName() and setAltName().
     * @serial
     *
     * @see #getAltName
     * @see #setAltName
     * @see #altNameCtx
     * @see javax.naming.spi.ObjectFactory#getObjectInstance
     */
    protected Name altName = null;

    /**
     * Contains the context relative to which
     * <code>altName</code> is specified.  If null, then the default initial
     * context is implied.
     * See the <code>javax.naming.spi.ObjectFactory.getObjectInstance</code>
     * method for details on how this is used.
     * <p>
     * This field is initialized to null.
     * It should not be manipulated directly:  it should
     * be accessed and updated using getAltNameCtx() and setAltNameCtx().
     * @serial
     *
     * @see #getAltNameCtx
     * @see #setAltNameCtx
     * @see #altName
     * @see javax.naming.spi.ObjectFactory#getObjectInstance
     */
    protected Context altNameCtx = null;

    /**
     * Constructs a new instance of CannotProceedException using an
     * explanation. All unspecified fields default to null.
     *
     * @param	explanation	A possibly null string containing additional
     * 				detail about this exception.
     *	 If null, this exception has no detail message.
     * @see java.lang.Throwable#getMessage
     */
    public CannotProceedException(String explanation) {
	super(explanation);
    }

    /**
      * Constructs a new instance of CannotProceedException.
      * All fields default to null.
      */
    public CannotProceedException() {
	super();
    }

    /**
     * Retrieves the environment that was in effect when this exception
     * was created.
     * @return Possibly null environment property set.
     *		null means no environment was recorded for this exception.
     * @see #setEnvironment
     */
    public Hashtable getEnvironment() {
	return environment;
    }

    /**
     * Sets the environment that will be returned when getEnvironment()
     * is called.
     * @param environment A possibly null environment property set.
     * 		null means no environment is being recorded for 
     * 		this exception.
     * @see #getEnvironment
     */
    public void setEnvironment(Hashtable environment) {
	this.environment = environment;	// %%% clone it??
    }

    /**
     * Retrieves the "remaining new name" field of this exception, which is
     * used when this exception is thrown during a rename() operation.
     *
     * @return The possibly null part of the new name that has not been resolved.
     * 		It is a composite name. It can be null, which means
     *		the remaining new name field has not been set.
     *
     * @see #setRemainingNewName
     */
    public Name getRemainingNewName() {
	return remainingNewName;
    }

    /**
     * Sets the "remaining new name" field of this exception.
     * This is the value returned by <code>getRemainingNewName()</code>.
     *<p>
     * <tt>newName</tt> is a composite name. If the intent is to set
     * this field using a compound name or string, you must 
     * "stringify" the compound name, and create a composite
     * name with a single component using the string. You can then
     * invoke this method using the resulting composite name.
     *<p>
     * A copy of <code>newName</code> is made and stored.
     * Subsequent changes to <code>name</code> does not
     * affect the copy in this NamingException and vice versa.
     *
     * @param newName The possibly null name to set the "remaining new name" to.
     *		If null, it sets the remaining name field to null.
     *
     * @see #getRemainingNewName
     */
    public void setRemainingNewName(Name newName) {
	if (newName != null)
	    this.remainingNewName = (Name)(newName.clone());
	else
	    this.remainingNewName = null;
    }

    /**
     * Retrieves the <code>altName</code> field of this exception.
     * This is the name of the resolved object, relative to the context
     * <code>altNameCtx</code>. It will be used during a subsequent call to the
     * <code>javax.naming.spi.ObjectFactory.getObjectInstance</code> method.
     *
     * @return The name of the resolved object, relative to
     *		<code>altNameCtx</code>.
     * 		It is a composite name.  If null, then no name is specified.
     *
     * @see #setAltName
     * @see #getAltNameCtx
     * @see javax.naming.spi.ObjectFactory#getObjectInstance
     */
    public Name getAltName() {
	return altName;
    }

    /**
     * Sets the <code>altName</code> field of this exception.
     *
     * @param altName	The name of the resolved object, relative to
     *			<code>altNameCtx</code>.
     * 			It is a composite name.
     *			If null, then no name is specified.
     *
     * @see #getAltName
     * @see #setAltNameCtx
     */
    public void setAltName(Name altName) {
	this.altName = altName;
    }

    /**
     * Retrieves the <code>altNameCtx</code> field of this exception.
     * This is the context relative to which <code>altName</code> is named.
     * It will be used during a subsequent call to the
     * <code>javax.naming.spi.ObjectFactory.getObjectInstance</code> method.
     *
     * @return	The context relative to which <code>altName</code> is named.
     *		If null, then the default initial context is implied.
     *
     * @see #setAltNameCtx
     * @see #getAltName
     * @see javax.naming.spi.ObjectFactory#getObjectInstance
     */
    public Context getAltNameCtx() {
	return altNameCtx;
    }

    /**
     * Sets the <code>altNameCtx</code> field of this exception.
     *
     * @param altNameCtx
     *			The context relative to which <code>altName</code>
     *			is named.  If null, then the default initial context
     *			is implied.
     *
     * @see #getAltNameCtx
     * @see #setAltName
     */
    public void setAltNameCtx(Context altNameCtx) {
	this.altNameCtx = altNameCtx;
    }


    /**
     * Use serialVersionUID from JNDI 1.1.1 for interoperability
     */
    private static final long serialVersionUID = 1219724816191576813L;
}