Call a member function to get the value : Method « Reflection « Java Tutorial

1. Java Tutorial
2. Reflection
3. Method

// $Id: ReflectionHelper.java 16271 2009-04-07 20:20:12Z hardy.ferentschik $
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*
* 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
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import java.beans.Introspector;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;


/**
 * Some reflection utility methods.
 *
 * @author Hardy Ferentschik
 */
public class ReflectionHelper {

  public static Object getValue(Member member, Object object) {
    Object value = null;

    if ( member instanceof Method ) {
      Method method = ( Method ) member;
      try {
        value = method.invoke( object );
      }
      catch ( IllegalAccessException e ) {
        throw new RuntimeException( "Unable to access " + method.getName(), e );
      }
      catch ( InvocationTargetException e ) {
        throw new RuntimeException( "Unable to access " + method.getName(), e );
      }
    }
    else if ( member instanceof Field ) {
      Field field = ( Field ) member;
      try {
        value = field.get( object );
      }
      catch ( IllegalAccessException e ) {
        throw new RuntimeException( "Unable to access " + field.getName(), e );
      }
    }
    return value;
  }

}