EnumVisitor.java

/**
 * Copyright (C) 2010 Michael Mosmann <michael@mosmann.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.flapdoodle.mongoom.mapping.types;

import de.flapdoodle.mongoom.mapping.AbstractVisitor;
import de.flapdoodle.mongoom.mapping.ITransformation;
import de.flapdoodle.mongoom.mapping.ITypeInfo;
import de.flapdoodle.mongoom.mapping.ITypeVisitor;
import de.flapdoodle.mongoom.mapping.context.IMappingContext;
import de.flapdoodle.mongoom.mapping.context.IPropertyContext;
import de.flapdoodle.mongoom.mapping.properties.IAnnotated;
import de.flapdoodle.mongoom.mapping.converter.reflection.ClassInformation;
import de.flapdoodle.mongoom.mapping.types.enums.DefaultEnumStringConverter;
import de.flapdoodle.mongoom.mapping.types.enums.EnumConverterOption;
import de.flapdoodle.mongoom.mapping.types.enums.IEnumStringConverter;


public class EnumVisitor<T extends Enum<T>> extends AbstractVisitor implements ITypeVisitor<T,String> {

	@Override
	public ITransformation<T, String> transformation(IMappingContext mappingContext, IPropertyContext<?> propertyContext,
			ITypeInfo field) {
		Class<T> enumType = (Class<T>) field.getType();
		IEnumStringConverter<T> converter=new DefaultEnumStringConverter(enumType);
		if (field instanceof IAnnotated) {
			IAnnotated iafield=(IAnnotated) field;
			EnumConverterOption enumConverterOption = iafield.getAnnotation(EnumConverterOption.class);
			if (enumConverterOption!=null) {
				converter=(IEnumStringConverter<T>) ClassInformation.newInstance(enumConverterOption.converter());
			}
		}
		return new EnumTransformation<T>(enumType,converter);
	}
}