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/*
 * (c) Copyright IBM Corp 2001, 2005 
 */

package edu.uga.cs.lsdis.meteors.wadls.util;

import java.io.*;
import java.util.*;
import java.net.URL;
import java.net.MalformedURLException;

/**
 * Deals with strings (probably need to elaborate some more).
 *
 * @author   Matthew J. Duftler
 */
public class StringUtils
{
  public static final String lineSeparator =
    System.getProperty("line.separator", "\n");
  public static final String lineSeparatorStr = cleanString(lineSeparator);

  // Ensure that escape sequences are passed through properly.
  public static String cleanString(String str)
  {
    if (str == null)
      return null;
    else
    {
      char[]       charArray = str.toCharArray();
      StringBuffer sBuf      = new StringBuffer();
      
      for (int i = 0; i < charArray.length; i++)
        switch (charArray[i])
        {
          case '\"' : sBuf.append("\\\"");
                      break;
          case '\\' : sBuf.append("\\\\");
                      break;
          case '\n' : sBuf.append("\\n");
                      break;
          case '\r' : sBuf.append("\\r");
                      break;
          default   : sBuf.append(charArray[i]);
                      break;
        }
      
      return sBuf.toString();
    }
  }

  /*
    This method will return the correct name for a class object representing
    a primitive, a single instance of a class, as well as n-dimensional arrays
    of primitives or instances. This logic is needed to handle the string returned
    from Class.getName(). If the class object represents a single instance (or
    a primitive), Class.getName() returns the fully-qualified name of the class
    and no further work is needed. However, if the class object represents an
    array (of n dimensions), Class.getName() returns a Descriptor (the Descriptor
    grammar is defined in section 4.3 of the Java VM Spec). This method will
    parse the Descriptor if necessary.
  */
  public static String getClassName(Class targetClass)
  {
    String className = targetClass.getName();

    return targetClass.isArray() ? parseDescriptor(className) : className;
  }

  /*
    See the comment above for getClassName(targetClass)...
  */
  private static String parseDescriptor(String className)
  {
    char[] classNameChars = className.toCharArray();
    int    arrayDim       = 0;
    int    i              = 0;

    while (classNameChars[i] == '[')
    {
      arrayDim++;
      i++;
    }

    StringBuffer classNameBuf = new StringBuffer();

    switch (classNameChars[i++])
    {
      case 'B' : classNameBuf.append("byte");
                 break;
      case 'C' : classNameBuf.append("char");
                 break;
      case 'D' : classNameBuf.append("double");
                 break;
      case 'F' : classNameBuf.append("float");
                 break;
      case 'I' : classNameBuf.append("int");
                 break;
      case 'J' : classNameBuf.append("long");
                 break;
      case 'S' : classNameBuf.append("short");
                 break;
      case 'Z' : classNameBuf.append("boolean");
                 break;
      case 'L' : classNameBuf.append(classNameChars,
                                     i, classNameChars.length - i - 1);
                 break;
    }

    for (i = 0; i < arrayDim; i++)
      classNameBuf.append("[]");

    return classNameBuf.toString();
  }

  /*
  @param contextURL the context in which to attempt to resolve the spec.
  Effectively a document base.
  */
  public static URL getURL(URL contextURL, String spec)
    throws MalformedURLException
  {
    if (contextURL != null)
    {
      File tempFile = new File(spec);

      if (tempFile.isAbsolute())
      {
        return tempFile.toURL();
      }
    }

    try
    {
      return new URL(contextURL, spec);
    }
    catch (MalformedURLException e)
    {
      if (contextURL == null)
      {
        return new File(spec).toURL();
      }
      else
      {
        throw e;
      }
    }
  }

  /*
    Returns an InputStream for reading from the specified resource, if the
    resource points to a stream.
  */
  public static InputStream getContentAsInputStream(URL url)
    throws SecurityException,
           IllegalArgumentException,
           IOException
  {
    if (url == null)
    {
      throw new IllegalArgumentException("URL cannot be null.");
    }

    try
    {
      Object content = url.getContent();

      if (content == null)
      {
        throw new IllegalArgumentException("No content.");
      }

      if (content instanceof InputStream)
      {
        return (InputStream)content;
      }
      else
      {
        throw new IllegalArgumentException((content instanceof String)
                                           ? (String)content
                                           : "This URL points to a: " +
                                             StringUtils.getClassName(content.getClass()));
      }
    }
    catch (SecurityException e)
    {
      throw new SecurityException("Your JVM's SecurityManager has " +
                                  "disallowed this.");
    }
    catch (FileNotFoundException e)
    {
      throw new FileNotFoundException("This file was not found: " + url);
    }
  }

  public static List parseNMTokens(String nmTokens)
  {
    StringTokenizer strTok = new StringTokenizer(nmTokens, " ");
    List tokens = new Vector();

    while (strTok.hasMoreTokens())
    {
      tokens.add(strTok.nextToken());
    }

    return tokens;
  }

  public static String getNMTokens(List list)
  {
    if (list != null)
    {
      StringBuffer strBuf = new StringBuffer();
      int size = list.size();

      for (int i = 0; i < size; i++)
      {
        String token = (String)list.get(i);

        strBuf.append((i > 0 ? " " : "") + token);
      }

      return strBuf.toString();
    }
    else
    {
      return null;
    }
  }
}