tokenmgrerror.java

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package com.laoer.bbscs.lucene.html;

/**
 * <p>Title: 天乙社区V5.0</p>
 * <p>Description: BBS-CS天乙社区V5.0</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: laoer.com</p>
 * @author 龚天乙
 * @version 5.0
 */

public class TokenMgrError
    extends Error {
  /*
   * Ordinals for various reasons why an Error of this type can be thrown.
   */

  /**
   * Lexical error occured.
   */
  static final int LEXICAL_ERROR = 0;

  /**
       * An attempt wass made to create a second instance of a static token manager.
   */
  static final int STATIC_LEXER_ERROR = 1;

  /**
   * Tried to change to an invalid lexical state.
   */
  static final int INVALID_LEXICAL_STATE = 2;

  /**
   * Detected (and bailed out of) an infinite loop in the token manager.
   */
  static final int LOOP_DETECTED = 3;

  /**
   * Indicates the reason why the exception is thrown. It will have
   * one of the above 4 values.
   */
  int errorCode;

  /**
   * Replaces unprintable characters by their espaced (or unicode escaped)
   * equivalents in the given string
   */
  protected static final String addEscapes(String str) {
    StringBuffer retval = new StringBuffer();
    char ch;
    for (int i = 0; i < str.length(); i++) {
      switch (str.charAt(i)) {
        case 0:
          continue;
        case '\b':
          retval.append("\\b");
          continue;
        case '\t':
          retval.append("\\t");
          continue;
        case '\n':
          retval.append("\\n");
          continue;
        case '\f':
          retval.append("\\f");
          continue;
        case '\r':
          retval.append("\\r");
          continue;
        case '\"':
          retval.append("\\\"");
          continue;
        case '\'':
          retval.append("\\\'");
          continue;
        case '\\':
          retval.append("\\\\");
          continue;
        default:
          if ( (ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
            String s = "0000" + Integer.toString(ch, 16);
            retval.append("\\u" + s.substring(s.length() - 4, s.length()));
          }
          else {
            retval.append(ch);
          }
          continue;
      }
    }
    return retval.toString();
  }

  /**
   * Returns a detailed message for the Error when it is thrown by the
   * token manager to indicate a lexical error.
   * Parameters :
   *    EOFSeen     : indicates if EOF caused the lexicl error
   *    curLexState : lexical state in which this error occured
   *    errorLine   : line number when the error occured
   *    errorColumn : column number when the error occured
   *    errorAfter  : prefix that was seen before this error occured
   *    curchar     : the offending character
       * Note: You can customize the lexical error message by modifying this method.
   */
  protected static String LexicalError(boolean EOFSeen, int lexState,
                                       int errorLine, int errorColumn,
                                       String errorAfter, char curChar) {
    return ("Lexical error at line " +
            errorLine + ", column " +
            errorColumn + ".  Encountered: " +
            (EOFSeen ? "<EOF> " :
             ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" +
             (int) curChar + "), ") +
            "after : \"" + addEscapes(errorAfter) + "\"");
  }

  /**
       * You can also modify the body of this method to customize your error messages.
   * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
   * of end-users concern, so you can return something like :
   *
   *     "Internal Error : Please file a bug report .... "
   *
   * from this method for such cases in the release version of your parser.
   */
  public String getMessage() {
    return super.getMessage();
  }

  /*
   * Constructors of various flavors follow.
   */

  public TokenMgrError() {
  }

  public TokenMgrError(String message, int reason) {
    super(message);
    errorCode = reason;
  }

  public TokenMgrError(boolean EOFSeen, int lexState, int errorLine,
                       int errorColumn, String errorAfter, char curChar,
                       int reason) {
    this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter,
                      curChar), reason);
  }
}