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The core XML data binding framework with support for marshalling Java objects to and unmarshalling from XML documents.
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package org.exolab.castor.util;

import org.apache.regexp.*;
import org.castor.core.util.Messages;

/**
 * An implementation of {@link RegExpEvaluator} that uses the Jakarta Regular Expression library.
 * For more information about the Jakarta RE library please visit:
 *  http://jakarta.apache.org/regexp/
 * 
 * @author Keith Visco
 * @version $Revision$ $Date: 2004-02-14 02:16:35 -0700 (Sat, 14 Feb 2004) $
 */
public class JakartaRegExpEvaluator implements RegExpEvaluator {

  /**
   * Reguar expression denoting a beginning of line.
   */
  private static final String BOL = "^(";

  /**
   * Regular expression denoting end of line.
   */
  private static final String EOL = ")$";

  /**
   * The Regular expression
   */
  private RE _regexp;

  /**
   * {@inheritDoc}
   * 
   * @see org.exolab.castor.util.RegExpEvaluator#setExpression(java.lang.String)
   */
  public void setExpression(final String rexpr) {

    if (rexpr != null) {
      try {
        // -- patch and compile expression
        _regexp = new RE(BOL + rexpr + EOL);
      } catch (RESyntaxException ex) {
        String message = Messages.format("regexp.eval.error", rexpr);
        throw new IllegalArgumentException(message, ex);
      }
    } else {
      _regexp = null;
    }
  }

  /**
   * {@inheritDoc}
   * 
   * @see org.exolab.castor.util.RegExpEvaluator#matches(java.lang.String)
   */
  public boolean matches(final String value) {
    if (_regexp != null) {
      return _regexp.match(value);
    }
    return true;
  }

}