get Component Type via reflection - Java Reflection

Java examples for Reflection:Array

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Description

get Component Type via reflection

Demo Code

/**/*from   w  w  w .java  2  s.  co  m*/
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;

public class Main {
  public static Type getComponentType(Type collectionType) {

    Class<?> collectionClass = collectionType.getClass();
    if (collectionClass == null || !Collection.class.isAssignableFrom(collectionClass))
      return null;

    if (collectionType instanceof ParameterizedType) {
      Type[] componentTypes = ((ParameterizedType) collectionType).getActualTypeArguments();
      if (componentTypes != null && componentTypes.length == 1)
        return componentTypes[0];
    }

    return Object.class;
  }
}

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