uimafit-legacy-support/src/main/java/org/apache/uima/fit/legacy/converter/NoConversionConverter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.uima.fit.legacy.converter;

import java.lang.annotation.Annotation;

/**
 * Fallback converter that does not convert anything.
 * 
 * @author Richard Eckart de Castilho
 */
public class NoConversionConverter extends ContextlessAnnotationConverterBase<Annotation, Annotation> {

  private static NoConversionConverter instance = null;
  
  public NoConversionConverter() {
    // Nothing to do
  }

  @Override
  public Annotation convert(Annotation aAnnotation) {
    return null;
  }

  @SuppressWarnings({ "unchecked", "rawtypes" })
  public Class<Annotation> getModernType() {
    return (Class) NoAnnotation.class;
  }

  @SuppressWarnings({ "unchecked", "rawtypes" })
  public Class<Annotation> getLegacyType() {
    return (Class) NoAnnotation.class;
  }
  
  public static NoConversionConverter getInstance() {
    if (instance == null) {
      instance = new NoConversionConverter();
    }
    return instance;
  }
  
  private @interface NoAnnotation {};
}