/*
* Copyright (c) 2010, Michael Grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. 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.
*/
package org.jowidgets.util;
public final class TypeCast {
private TypeCast() {
super();
}
/**
* Converts an object to an specific type if possible. Else an IllegalStateException is thrown.
*
* @param <RESULT_TYPE> The type to convert to
* @param obj The object to cast, maybe null
* @param type The type to convert to
* @return The casted object
* @throws IllegalStateException if object could not be casted
*/
@SuppressWarnings("unchecked")
public static <RESULT_TYPE> RESULT_TYPE toType(final Object obj, final Class<RESULT_TYPE> type) {
Assert.paramNotNull(type, "type");
if (obj != null && !type.isAssignableFrom(obj.getClass())) {
throw new IllegalStateException("Type '"
+ type.getName()
+ "' expected, but type is '"
+ obj.getClass().getName()
+ "'.");
}
return (RESULT_TYPE) obj;
}
}