commonjava-developer

[John C. <joh...@co...>]

Update of /cvsroot/commonjava/other-projects/marmalade/src/main/java/org/marmalade
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv30096/src/main/java/org/marmalade

Added Files:
	ConfigurationException.java MarmaladeFactory.java 
Log Message:
initial checkin.

--- NEW FILE: MarmaladeFactory.java ---
/* Created on Mar 24, 2004 */
package org.marmalade;

import java.util.Map;

import org.codehaus.tagalog.Attributes;
import org.commonjava.reflection.FinderException;
import org.commonjava.reflection.ImplFinder;
import org.marmalade.el.ExpressionEvaluator;

/** Provide factory methods to retrieve specific implementations for various dynamic elements of
 * the marmalade system.
 * 
 * @author John Casey
 */
public final class MarmaladeFactory {
  
  private static final String DEFAULT_EL_TYPE = "ognl";
  
  private static final String EL_LOCK = "EL-LOCK".intern();
  
  private static ExpressionEvaluator el;

  /** Factory; deny construction.
   */
  private MarmaladeFactory() {
  }
  
  public static ExpressionEvaluator getDefaultExpressionEvaluator() 
  throws ConfigurationException
  {
    return getExpressionEvaluator(DEFAULT_EL_TYPE);
  }
  
  public static ExpressionEvaluator getExpressionEvaluator(String type) 
  throws ConfigurationException
  {
    synchronized(EL_LOCK){
      if(el == null){
        try {
          el = (ExpressionEvaluator)ImplFinder.findImplementation(
            ExpressionEvaluator.class, new Object[]{}
          );
        }
        catch (FinderException e) {
          throw new ConfigurationException(
            "Error retrieving ExpressionEvaluator implementation.", e
          );
        }
      }
      
      return el;
    }
  }

}

--- NEW FILE: ConfigurationException.java ---
/* Created on Mar 24, 2004 */
package org.marmalade;

import org.codehaus.tagalog.TagException;

/** Represents an error while executing a marmalade process, which is related to a 
 * misconfiguration of the marmalade environment.
 * 
 * @author John Casey
 */
public class ConfigurationException extends TagException {

  /** Create a new exception instance
   * @param message The error message
   */
  public ConfigurationException(String message) {
    super(message);
  }

  /** Create a new exception instance
   * @param message The error message
   * @param cause The root cause which interrupted marmalade processing
   */
  public ConfigurationException(String message, Throwable cause) {
    super(message, cause);
  }

}