Java Reflection Generic Type from Field getGenericTypes(Field field)

Description

Returns the generic type information of an attribute.

License

Open Source License

Parameter

Parameter	Description
field	the field representation of the attribute.

Return

an array of types that are used to parameterize the attribute.

Declaration

public static Class<?>[] getGenericTypes(Field field) 

Method Source Code

//package com.java2s;
/*//from   w  w  w  .j a va 2s. c o m
 * (c) Copyright 2007-2013 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

import java.lang.reflect.*;

public class Main {
    /**
     * Returns the generic type information of an attribute.
     * @param field the field representation of the attribute.
     * @return an array of types that are used to parameterize the attribute.
     */
    public static Class<?>[] getGenericTypes(Field field) {
        Type genericFieldType = field.getGenericType();
        if (!(genericFieldType instanceof ParameterizedType))
            return null; // type is not generic
        ParameterizedType pType = (ParameterizedType) genericFieldType;
        Type[] args = pType.getActualTypeArguments();
        Class<?>[] types = new Class[args.length];
        System.arraycopy(args, 0, types, 0, args.length);
        return types;
    }
}

Related

1. getGenericTypeArguments(final Field field)
2. getGenericTypeOfCollectionField(Field field)
3. getGenericTypes(Field field)
4. getGenericTypes(Field field)
5. getGenericTypes(Field field)
6. getGenericTypes(Field field)