Java List Cast castNonNullListParameterTo(String parameterName, List value, Class requiredType)

Description

cast Non Null List Parameter To

License

Mozilla Public License

Declaration

public static <T, R extends T> List<R> castNonNullListParameterTo(String parameterName, List<T> value,
            Class<R> requiredType) 

Method Source Code

//package com.java2s;
/*****************************************************************************************
 * *** BEGIN LICENSE BLOCK *****//www. java2 s .c om
 *
 * Version: MPL 2.0
 *
 * echocat RedPrecursor, Copyright (c) 2011-2012 echocat
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * *** END LICENSE BLOCK *****
 ****************************************************************************************/

import java.util.List;

public class Main {
    public static <T, R extends T> List<R> castNonNullListParameterTo(String parameterName, List<T> value,
            Class<R> requiredType) {
        if (value == null) {
            throw new IllegalArgumentException(parameterName + " is null");
        }
        for (T entry : value) {
            if (entry == null) {
                throw new IllegalArgumentException("One entry of " + parameterName + " is null.");
            }
            if (!requiredType.isInstance(entry)) {
                throw new IllegalArgumentException(
                        "One entry of " + parameterName + " is not of type " + requiredType.getName() + ".");
            }
        }
        //noinspection unchecked
        return (List<R>) value;
    }
}

Related

1. castList(final List original)
2. castList(final Object object)
3. castList(List list, Class clazz)
4. castListElem(List list, V target)
5. castListUnchecked(Object list)
6. castOrCopyToList(Iterable iterable)
7. castTo(final List list, final Class clasz)
8. castToDocumentList(Object obj)
9. castToList(U[] array, Class clazz)