/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Alex Rojkov
 */

package javax.faces.validator;

import javax.faces.context.FacesContext;
import javax.faces.component.UIComponent;
import javax.faces.component.StateHolder;
import javax.el.MethodExpression;
import javax.el.ELException;

public class MethodExpressionValidator
  implements Validator, StateHolder
{

  private MethodExpression _expression;

  private boolean _transient;

  public MethodExpressionValidator()
  {
  }

  public MethodExpressionValidator(MethodExpression expression)
  {
    _expression = expression;
  }

  public void validate(FacesContext context,
                       UIComponent component,
                       Object value)
    throws ValidatorException
  {
    try {
      _expression.invoke(
      context.getELContext(),
      new Object []{context, component, value}
      );
    }
    catch (ELException e) {
      Throwable t = e.getCause();

      if (t instanceof ValidatorException) {
        throw (ValidatorException) t;
      }
      
      throw e;
    }
  }

  public Object saveState(FacesContext context)
  {
    return _expression;
  }

  public void restoreState(FacesContext context, Object state)
  {
    _expression = (MethodExpression) state;
  }

  public boolean isTransient()
  {
    return _transient;
  }

  public void setTransient(boolean isTransient)
  {
    _transient = isTransient;
  }
}