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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
  * @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 is 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}.  It is a composite name.
     * If null, then no name is specified.
     * See the {@code javax.naming.spi.ObjectFactory.getObjectInstance}
     * 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} is specified.  If null, then the default initial
     * context is implied.
     * See the {@code javax.naming.spi.ObjectFactory.getObjectInstance}
     * 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
     */
    @SuppressWarnings("serial") // Not statically typed as Serializable
    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()}.
     *<p>
     * {@code newName} 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} is made and stored.
     * Subsequent changes to {@code name} 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} field of this exception.
     * This is the name of the resolved object, relative to the context
     * {@code altNameCtx}. It will be used during a subsequent call to the
     * {@code javax.naming.spi.ObjectFactory.getObjectInstance} method.
     *
     * @return The name of the resolved object, relative to
     *          {@code altNameCtx}.
     *          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} field of this exception.
     *
     * @param altName   The name of the resolved object, relative to
     *                  {@code altNameCtx}.
     *                  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} field of this exception.
     * This is the context relative to which {@code altName} is named.
     * It will be used during a subsequent call to the
     * {@code javax.naming.spi.ObjectFactory.getObjectInstance} method.
     *
     * @return  The context relative to which {@code altName} 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} field of this exception.
     *
     * @param altNameCtx
     *                  The context relative to which {@code altName}
     *                  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;
}
