/*
 * 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:
// -capitalize and parseTypeModifier should probably be in the
//  generators package.
// -D58319<daz> Add version() method.
// -D62023<daz> Add absDelta() method to support float computations.

import java.io.DataInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Vector;

import com.sun.tools.corba.se.idl.som.cff.FileLocator;

public class Util
{
  // <d58319>
  /**
   * Fetch the version number of this build of the IDL Parser Framework
   * from the appropriate properties file.
   * @return the version number contained within the appropriate properties
   *  file, which indicates the build of this IDL Parser Framework.
   **/
  public static String getVersion ()
  {
    return getVersion ("com/sun/tools/corba/se/idl/idl.prp");
  } // getVersion

  /**
   * Fetch the version number of this build of the IDL Parser Framework.
   * This method may be called before or after the framework has been
   * initialized. If the framework is inititialized, the version information
   * is extracted from the message properties object; otherwise, it is extracted
   * from the indicated messages file.
   * @return the version number.
   **/
  public static String getVersion (String filename)
  {
    String version = "";
    if (messages == null)  // Use supplied file
    {
      Vector oldMsgFiles = msgFiles;
      if (filename == null || filename.equals (""))
        filename = "com/sun/tools/corba/se/idl/idl.prp";
      filename = filename.replace ('/', File.separatorChar);
      registerMessageFile (filename);
      version = getMessage ("Version.product", getMessage ("Version.number"));
      msgFiles = oldMsgFiles;
      messages = null;
    }
    else
    {
      version = getMessage ("Version.product", getMessage ("Version.number"));
    }
    return version;
  } // getVersion

  public static boolean isAttribute (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof AttributeEntry;
  } // isAttribute

  public static boolean isConst (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof ConstEntry;
  } // isConst

  public static boolean isEnum (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof EnumEntry;
  } // isEnum

  public static boolean isException (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof ExceptionEntry;
  } // isException

  public static boolean isInterface (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof InterfaceEntry;
  } // isInterface

  public static boolean isMethod (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof MethodEntry;
  } // isMethod

  public static boolean isModule (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof ModuleEntry;
  } // isModule

  public static boolean isParameter (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof ParameterEntry;
  } // isParameter

  public static boolean isPrimitive (String name, Hashtable symbolTable)
  {
    // Distinguish "string" because the name could be something like:
    // string(25 + 1)
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    if (entry == null)
    {
      // If it is null then it may be of the form string(<exp>).
      // Don't just check for string because the name "string" may
      // have been overridden.
      int parenIndex = name.indexOf ('(');
      if (parenIndex >= 0)
        entry = (SymtabEntry)symbolTable.get (name.substring (0, parenIndex));
    }
    return entry == null ? false : entry instanceof PrimitiveEntry;
  } // isPrimitive

  public static boolean isSequence (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof SequenceEntry;
  } // isSequence

  public static boolean isStruct (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof StructEntry;
  } // isStruct

  public static boolean isString (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof StringEntry;
  } // isString

  public static boolean isTypedef (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof TypedefEntry;
  } // isTypedef

  public static boolean isUnion (String name, Hashtable symbolTable)
  {
    SymtabEntry entry = (SymtabEntry)symbolTable.get (name);
    return entry == null ? false : entry instanceof UnionEntry;
  } // isUnion

  //////////////
  // Message-related methods

  public static String getMessage (String key)
  {
    if (messages == null)
      readMessages ();
    String message = messages.getProperty (key);
    if (message == null)
      message = getDefaultMessage (key);
    return message;
  } // getMessage

  public static String getMessage (String key, String fill)
  {
    if (messages == null)
      readMessages ();
    String message = messages.getProperty (key);
    if (message == null)
      message = getDefaultMessage (key);
    else
    {
      int index = message.indexOf ("%0");
      if (index >= 0)
        message = message.substring (0, index) + fill + message.substring (index + 2);
    }
    return message;
  } // getMessage

  public static String getMessage (String key, String[] fill)
  {
    if (messages == null)
      readMessages ();
    String message = messages.getProperty (key);
    if (message == null)
      message = getDefaultMessage (key);
    else
      for (int i = 0; i < fill.length; ++i)
      {
        int index = message.indexOf ("%" + i);
        if (index >= 0)
          message = message.substring (0, index) + fill[i] + message.substring (index + 2);
      }
    return message;
  } // getMessage

  private static String getDefaultMessage (String keyNotFound)
  {
    String message = messages.getProperty (defaultKey);
    int index = message.indexOf ("%0");
    if (index > 0)
      message = message.substring (0, index) + keyNotFound;
    return message;
  } // getDefaultMessage

  /*
  findFile is no longer used now that FileLocator has been provided
  by Larry Raper of the Shasta team.

  static File findFile (String name) throws FileNotFoundException
  {
    String classpath = System.getProperty ("java.class.path");
    String separator = System.getProperty ("path.separator");
    int end = -separator.length (); // so the first pass classpath == original classpath
    File file;
    do
    {
      classpath = classpath.substring (end + separator.length ());
      end = classpath.indexOf (separator);
      if (end < 0) end = classpath.length ();
      file = new File (classpath.substring (0, end) + File.separator + "com" + File.separator + "ibm" + File.separator + "idl" + File.separator + name);
    } while (!file.exists () && end != classpath.length ());
    if (!file.exists ()) throw new FileNotFoundException ();
    return file;
  } // findFile
  */

  private static void readMessages ()
  {
    messages = new Properties ();
    Enumeration fileList = msgFiles.elements ();
    DataInputStream stream;
    while (fileList.hasMoreElements ())
      try
      {
        stream = FileLocator.locateLocaleSpecificFileInClassPath ((String)fileList.nextElement ());
        messages.load (stream);
      }
      catch (IOException e)
      {
      }
    if (messages.size () == 0)
      messages.put (defaultKey, "Error reading Messages File.");
  } // readMessages

  /** Register a message file.  This file will be searched for
      in the CLASSPATH. */
  public static void registerMessageFile (String filename)
  {
    if (filename != null)
      if (messages == null)
        msgFiles.addElement (filename);
      else
        try
        {
          DataInputStream stream = FileLocator.locateLocaleSpecificFileInClassPath (filename);
          messages.load (stream);
        }
        catch (IOException e)
        {
        }
  } // registerMessageFile

  private static Properties messages   = null;
  private static String     defaultKey = "default";
  private static Vector     msgFiles = new Vector ();
  static
  {
    msgFiles.addElement ("com/sun/tools/corba/se/idl/idl.prp");
  }

  // Message-related methods
  ///////////////

  public static String capitalize (String lc)
  {
    String first = new String (lc.substring (0, 1));
    first = first.toUpperCase ();
    return first + lc.substring (1);
  } // capitalize

  ///////////////
  // General file methods

  /** Searches the current user directory and a list of directories for
      a given short file name and returns its absolute file specification.
      @return Absolute file name of a given short filename
      @throws FileNotFoundException The file does not exist in the
       current user or specified directories.
      @see java.io.File.getAbsolutePath */
  public static String getAbsolutePath (String filename, Vector includePaths) throws FileNotFoundException
  {
    String filepath = null;
    File file = new File (filename);
    if (file.canRead ())
      filepath = file.getAbsolutePath ();
    else
    {
      String fullname = null;
      Enumeration pathList = includePaths.elements ();
      while (!file.canRead () && pathList.hasMoreElements ())
      {
        fullname = (String)pathList.nextElement () + File.separatorChar + filename;
        file = new File (fullname);
      }
      if (file.canRead ())
        filepath = file.getPath ();
      else
        throw new FileNotFoundException (filename);
    }
    return filepath;
  } // getAbsolutePath

  // General file methods
  ///////////////

  ///////////////
  // Numeric computations

  // <d62023>
  /**
   * Compute the absolute value of the difference between two floating-point
   * numbers having single precision.
   * @return the absolute value of the difference between two floats.
   **/
  public static float absDelta (float f1, float f2)
  {
    double delta = f1 - f2;
    return (float)((delta < 0) ? delta * -1.0 : delta);
  } // absDelta

  // Numeric computations
  ///////////////

  static RepositoryID emptyID = new RepositoryID ();
} // class Util