matchactionprocessor.java

jakarta-oro-2.0.8 正则表达式 引擎 源代码

   * is performed for every line of input.
   * <p>
   * @param pattern  The pattern to bind to an action.
   * @exception MalformedPatternException If the pattern cannot be compiled.
   */
  public void addAction(String pattern) throws MalformedPatternException {
    addAction(pattern, 0);
  }


  /**
   * Registers a pattern action pair.  If a pattern is null, the action
   * is performed for every line of input.
   * <p>
   * @param pattern  The pattern to bind to an action.
   * @param action   The action to associate with the pattern.
   * @exception MalformedPatternException If the pattern cannot be compiled.
   */
  public void addAction(String pattern, MatchAction action)
       throws MalformedPatternException
  {
    addAction(pattern, 0, action);
  }

  /**
   * Sets the field separator to use when splitting a line into fields.
   * If the field separator is never set, or set to null, matched input
   * lines are not split into fields.
   * <p>
   * @param separator  A regular expression defining the field separator.
   * @param options    The options to use when compiling the separator.
   * @exception MalformedPatternException If the separator cannot be compiled.
   */
  public void setFieldSeparator(String separator, int options)
       throws MalformedPatternException
  { 
    if(separator == null) {
      __fieldSeparator = null;
      return;
    }
    __fieldSeparator = __compiler.compile(separator, options);
  }


  /**
   * Sets the field separator to use when splitting a line into fields.
   * If the field separator is never set, or set to null, matched input
   * lines are not split into fields.
   * <p>
   * @param separator  A regular expression defining the field separator.
   * @exception MalformedPatternException If the separator cannot be compiled.
   */
  public void setFieldSeparator(String separator)
       throws MalformedPatternException
  {
    setFieldSeparator(separator, 0);
  }


  /**
   * This method reads the provided input one line at a time and for
   * every registered pattern that is contained in the line it executes
   * the associated MatchAction's processMatch() method.  If a field
   * separator has been defined with
   * {@link #setFieldSeparator setFieldSeparator()}, the
   * fields member of the MatchActionInfo instance passed to the
   * processMatch() method is set to a Vector of Strings containing
   * the split fields of the line.  Otherwise the fields member is set
   * to null.  If no match was performed to invoke the action (i.e.,
   * a null pattern was registered), then the match member is set
   * to null.  Otherwise, the match member will contain the result of
   * the match.
   * <p>
   * The input stream, having been exhausted, is closed right before the
   * method terminates and the output stream is flushed.
   * <p>
   * @see MatchActionInfo
   * @param input  The input stream from which to read lines.
   * @param output Where to send output.
   * @param encoding The character encoding of the InputStream source.
   *           If you also want to define an output character encoding,
   *           you should use {@link #processMatches(Reader, Writer)}
   *           and specify the encodings when creating the Reader and
   *           Writer sources and sinks.
   * @exception IOException  If an error occurs while reading input
   *            or writing output.
   */
  public void processMatches(InputStream input, OutputStream output,
			     String encoding)
    throws IOException
  {
    processMatches(new InputStreamReader(input, encoding),
		   new OutputStreamWriter(output));
  }


  /**
   * This method reads the provided input one line at a time using the
   * platform standart character encoding and for every registered
   * pattern that is contained in the line it executes the associated
   * MatchAction's processMatch() method.  If a field separator has been
   * defined with {@link #setFieldSeparator setFieldSeparator()}, the
   * fields member of the MatchActionInfo instance passed to the
   * processMatch() method is set to a Vector of Strings containing
   * the split fields of the line.  Otherwise the fields member is set
   * to null.  If no match was performed to invoke the action (i.e.,
   * a null pattern was registered), then the match member is set
   * to null.  Otherwise, the match member will contain the result of
   * the match.
   *
   * <p>
   * The input stream, having been exhausted, is closed right before the
   * method terminates and the output stream is flushed.
   * <p>
   *
   * @see MatchActionInfo
   * @param input  The input stream from which to read lines.
   * @param output Where to send output.
   * @exception IOException  If an error occurs while reading input
   *            or writing output.
   */
  public void processMatches(InputStream input, OutputStream output)
    throws IOException
  {
    processMatches(new InputStreamReader(input),
		   new OutputStreamWriter(output));
  }

  /**
   * This method reads the provided input one line at a time and for
   * every registered pattern that is contained in the line it executes
   * the associated MatchAction's processMatch() method.  If a field
   * separator has been defined with
   * {@link #setFieldSeparator setFieldSeparator()}, the
   * fields member of the MatchActionInfo instance passed to the
   * processMatch() method is set to a Vector of Strings containing
   * the split fields of the line.  Otherwise the fields member is set
   * to null.  If no match was performed to invoke the action (i.e.,
   * a null pattern was registered), then the match member is set
   * to null.  Otherwise, the match member will contain the result of
   * the match.
   * <p>
   * The input stream, having been exhausted, is closed right before the
   * method terminates and the output stream is flushed.
   * <p>
   * @see MatchActionInfo
   * @param input  The input stream from which to read lines.
   * @param output Where to send output.
   * @exception IOException  If an error occurs while reading input
   *            or writing output.
   */
  public void processMatches(Reader input, Writer output)
    throws IOException
  {
    int patternCount, current;
    LineNumberReader reader = new LineNumberReader(input);
    PrintWriter writer    = new PrintWriter(output);
    MatchActionInfo info  = new MatchActionInfo();
    Object obj;
    Pattern pattern;
    MatchAction action;
    List fields = new ArrayList();

    // Set those things that will not change.
    info.matcher        = __matcher;
    info.fieldSeparator = __fieldSeparator;
    info.input          = reader;
    info.output         = writer;
    info.fields         = null;
    patternCount        = __patterns.size();

    info.lineNumber     = 0;

    while((info.line = reader.readLine()) != null) {
      info.charLine = info.line.toCharArray();
      for(current=0; current < patternCount; current++) {
	obj     = __patterns.elementAt(current);
	// If a pattern is null, it means to do it for every line.
	if(obj != null) {
	  pattern = (Pattern)__patterns.elementAt(current);
	  if(__matcher.contains(info.charLine, pattern)) {
	    info.match = __matcher.getMatch();
	    info.lineNumber = reader.getLineNumber();
	    info.pattern    = pattern;
	    if(__fieldSeparator != null) {
	      fields.clear();
	      Util.split(fields, __matcher, __fieldSeparator, info.line);
	      info.fields = fields;
	    } else
	      info.fields = null;
	    action = (MatchAction)__actions.elementAt(current);
	    action.processMatch(info);
	  }
	} else {
	  info.match      = null;
	  info.lineNumber = reader.getLineNumber();
	  if(__fieldSeparator != null) {
	    fields.clear();
	    Util.split(fields, __matcher, __fieldSeparator, info.line);
	    info.fields = fields;
	  } else
	    info.fields = null;
	  action = (MatchAction)__actions.elementAt(current);
	  action.processMatch(info);
	}
      }
    }

    // Flush output but don't close, close input since we reached end.
    writer.flush();
    reader.close();
  }


}