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Java example source code file (ForwardEntry.java)

This example Java source code file (ForwardEntry.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

enumeration, exception, forwardentry, forwardgen, generator, hashtable, idlid, interfaceentry, interfaceentry\'s, interfacetype, object, printwriter, symtabentry, util, vector

The ForwardEntry.java Java example source code

/*
 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 * COMPONENT_NAME: idl.parser
 *
 * ORIGINS: 27
 *
 * Licensed Materials - Property of IBM
 * 5639-D57 (C) COPYRIGHT International Business Machines Corp. 1997, 1999
 * RMI-IIOP v1.0
 *
 */

package com.sun.tools.corba.se.idl;

// NOTES:

import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

/**
 * This is the symbol table entry for forward declarations of interfaces.
 **/
public class ForwardEntry extends SymtabEntry implements InterfaceType
{
  protected ForwardEntry ()
  {
    super ();
  } // ctor

  protected ForwardEntry (ForwardEntry that)
  {
    super (that);
  } // ctor

  protected ForwardEntry (SymtabEntry that, IDLID clone)
  {
    super (that, clone);
    if (module ().equals (""))
      module (name ());
    else if (!name ().equals (""))
      module (module () + "/" + name ());
  } // ctor

  public Object clone ()
  {
    return new ForwardEntry (this);
  } // clone

  /** Invoke the forward declaration generator.
      @param symbolTable the symbol table is a hash table whose key is
       a fully qualified type name and whose value is a SymtabEntry or
       a subclass of SymtabEntry.
      @param stream the stream to which the generator should sent its output.
      @see SymtabEntry */
  public void generate (Hashtable symbolTable, PrintWriter stream)
  {
    forwardGen.generate (symbolTable, this, stream);
  } // generate

  /** Access the interface generator.
      @returns an object which implements the InterfaceGen interface.
      @see InterfaceGen */
  public Generator generator ()
  {
    return forwardGen;
  } // generator

  static boolean replaceForwardDecl (InterfaceEntry interfaceEntry)
  {
    boolean result = true;
    try
    {
      ForwardEntry forwardEntry =
          (ForwardEntry)Parser.symbolTable.get (interfaceEntry.fullName ());
      if ( forwardEntry != null )
      {
        result = (interfaceEntry.getInterfaceType () ==
            forwardEntry.getInterfaceType ());
        forwardEntry.type (interfaceEntry);

        // If this interface has been forward declared, there are probably
        // other interfaces which derive from a ForwardEntry.  Replace
        // those ForwardEntry's with this InterfaceEntry:
        interfaceEntry.forwardedDerivers = forwardEntry.derivers;
        for ( Enumeration derivers = forwardEntry.derivers.elements();
              derivers.hasMoreElements(); )
          ((InterfaceEntry)derivers.nextElement ()).replaceForwardDecl (forwardEntry, interfaceEntry);

        // Replace the entry's whose types are forward declarations:
        for ( Enumeration types = forwardEntry.types.elements ();
              types.hasMoreElements (); )
          ((SymtabEntry)types.nextElement ()).type (interfaceEntry);
      }
    }
    catch (Exception exception)
    {}
    return result;
  } // replaceForwardDecl

  ///////////////
  // Implement interface InterfaceType

  public int getInterfaceType ()
  {
    return _type;
  }

  public void setInterfaceType (int type)
  {
    _type = type;
  }

  static ForwardGen forwardGen;
  Vector            derivers   = new Vector (); // Vector of InterfaceEntry's.
  Vector            types      = new Vector (); // Vector of the entry's whose type is a forward declaration.
  private int   _type  = InterfaceType.NORMAL; // interface type
} // class ForwardEntry

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