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    • net.stickycode.coercion.EnumCoercion Maven / Gradle / Ivy

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    /**
 * Copyright (c) 2010 RedEngine Ltd, http://www.redengine.co.nz. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package net.stickycode.coercion;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import net.stickycode.stereotype.plugin.StickyExtension;

@StickyExtension
public class EnumCoercion
    extends AbstractNoDefaultCoercion {

  @Override
  public Object coerce(CoercionTarget target, String value) {
    return getEnumValue(value, target);
  }

  private Object getEnumValue(String value, CoercionTarget target) {
    Method valueOfMethod = getValueOfMethod(target);
    try {
      return valueOfMethod.invoke(null, new Object[] { value });
    }
    catch (Exception e) {
      throw new EnumValueNotFoundException(e, value, getValues(target));
    }
  }

  private Object[] getValues(CoercionTarget target) {
    try {
      return (Object[])target.getType().getMethod("values", new Class[0]).invoke(null, new Object[0]);
    }
    catch (NoSuchMethodException e) {
      throw new EnumValuesMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
    catch (IllegalArgumentException e) {
      throw new EnumValuesMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
    catch (SecurityException e) {
      throw new EnumValuesMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
    catch (IllegalAccessException e) {
      throw new EnumValuesMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
    catch (InvocationTargetException e) {
      throw new EnumValuesMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
  }

  private Method getValueOfMethod(CoercionTarget target) {
    try {
      return target.getType().getMethod("valueOf", new Class[] { String.class });
    }
    catch (NoSuchMethodException e) {
      throw new EnumValueOfMethodNotFoundEvenThoughWeVerifiedItWasThere(e);
    }
  }

  @Override
  public boolean isApplicableTo(CoercionTarget target) {
    return target.getType().isEnum();
  }

  @Override
  public String toString() {
    return getClass().getSimpleName();
  }

}
    
    
    
    

    




    
    
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