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ProtoBuf integration with EL 3.0
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//
// Copyright © 2014, David Tesler (https://github.com/protobufel)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the  nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

package com.github.protobufel.el;

import javax.el.ELContext;
import javax.el.TypeConverter;

import com.google.protobuf.Descriptors.FieldDescriptor;

/**
 * ProtoBuf EL Utilities.
 *
 * @author [email protected] David Tesler
 */
public class ProtoBeanUtils {
  private ProtoBeanUtils() {}

  /**
   * A FieldDescriptor TypeConverter.
   *
   * @see TypeConverter
   * @author [email protected] David Tesler
   */
  public static class FieldDescriptorConverter extends TypeConverter {

    @Override
    public Object convertToType(final ELContext context, final Object obj, final Class targetType) {
      if (obj instanceof FieldDescriptor) {
        if (targetType == String.class) {
          context.setPropertyResolved(obj, targetType);
          return ((FieldDescriptor) obj).getName();
        }
      }

      return null;
    }
  }
}