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Java example source code file (UnionEntry.java)

This example Java source code file (UnionEntry.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, expression, generator, hashtable, idlid, object, printwriter, symtabentry, typedefentry, unionbranch, unionentry, uniongen, util, vector

The UnionEntry.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;

import com.sun.tools.corba.se.idl.constExpr.Expression;

/**
 * This is the symbol table entry for unions.
 **/
public class UnionEntry extends SymtabEntry
{
  protected UnionEntry ()
  {
    super ();
  } // ctor

  protected UnionEntry (UnionEntry that)
  {
    super (that);
    if (!name ().equals (""))
    {
      module (module () + name ());
      name ("");
    }
    _branches      = (Vector)that._branches.clone ();
    _defaultBranch = that._defaultBranch;
    _contained     = that._contained;
  } // ctor

  protected UnionEntry (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 UnionEntry (this);
  } // clone

  /** Invoke the union 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)
  {
    unionGen.generate (symbolTable, this, stream);
  } // generate

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

  public void addBranch (UnionBranch branch)
  {
    _branches.addElement (branch);
  } // addBranch

  /** This is a vector of UnionBranch's. */
  public Vector branches ()
  {
    return _branches;
  } // branches

  /** This TypedefEntry describes the type and name for the default branch.
      Like the entries in the branches vector, only the type and name fields
      are pertinent. */
  public void defaultBranch (TypedefEntry branch)
  {
    _defaultBranch = branch;
  } // defaultBranch

  /** This TypedefEntry describes the type and name for the default branch.
      Like the entries in the branches vector, only the type and name fields
      are pertinent. */
  public TypedefEntry defaultBranch ()
  {
    return _defaultBranch;
  } // defaultBranch

  public void addContained (SymtabEntry entry)
  {
    _contained.addElement (entry);
  } // addContained

  /** This is a vector of SymtabEntry's.  It itemizes any types which
      this union contains.  For example:

      <pre>
      union A
      switch (long)
      {
        case 0: long x;
        case 1:
          Struct B
          {
            long a;
            long b;
          } y;
      }
      </pre>
      Struct B is contained within union A. */
  public Vector contained ()
  {
    return _contained;
  } // contained

  boolean has (Expression label)
  {
    Enumeration eBranches = _branches.elements ();
    while (eBranches.hasMoreElements ())
    {
      Enumeration eLabels = ((UnionBranch)eBranches.nextElement ()).labels.elements ();
      while (eLabels.hasMoreElements ())
      {
        Expression exp = (Expression)eLabels.nextElement ();
        if (exp.equals (label) || exp.value ().equals (label.value ()))
          return true;
      }
    }
    return false;
  } // has

  boolean has (TypedefEntry typedef)
  {
    Enumeration e = _branches.elements ();
    while (e.hasMoreElements ())
    {
      UnionBranch branch = (UnionBranch)e.nextElement ();
      if (!branch.typedef.equals (typedef) && branch.typedef.name ().equals (typedef.name ()))
        return true;
    }
    return false;
  } // has

  /** A vector of UnionBranch's. */
  private Vector       _branches      = new Vector ();
  private TypedefEntry _defaultBranch = null;
  private Vector       _contained     = new Vector ();

  static UnionGen unionGen;
} // class UnionEntry

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