Java Assert Null assertInstance(final Object object, final Class c, final boolean allowNull)

Description

Asserts the the given object is an instance of the given class -- optionally allowing the object to be null.

License

Open Source License

Parameter

Parameter	Description
object	The object for which the type should be checked.
c	The class that the object must be; fails if the class is <code>null</code>.
allowNull	Whether the object being <code>null</code> will not cause a failure.

Declaration

public static final void assertInstance(final Object object,
        final Class c, final boolean allowNull) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*ww w  . j av  a  2  s.  co  m*/
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

public class Main {
    /**
     * Asserts the the given object is an instance of the given class --
     * optionally allowing the object to be <code>null</code>.
     * 
     * @param object
     *            The object for which the type should be checked.
     * @param c
     *            The class that the object must be; fails if the class is
     *            <code>null</code>.
     * @param allowNull
     *            Whether the object being <code>null</code> will not cause a
     *            failure.
     */
    public static final void assertInstance(final Object object,
            final Class c, final boolean allowNull) {
        if (object == null && allowNull) {
            return;
        }

        if (object == null || c == null) {
            throw new NullPointerException();
        } else if (!c.isInstance(object)) {
            throw new IllegalArgumentException();
        }
    }
}

Related

1. assertAllAreNull(String messageIfNull, Object... objects)
2. assertIsNull(Object obj)
3. assertNonNull(final T object, final String paramName)
4. assertNonNull(String argumentName, Object argument)
5. assertNoNull(Object object, String paramName)