/*
* Copyright (c) 2012, 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 jo-widgets.org 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.wrapper;
import org.jowidgets.util.Assert;
import org.jowidgets.util.NullCompatibleEquivalence;
public final class WrapperUtil {
private WrapperUtil() {}
/**
* Try to cast an object to an type. If the object implements the {@link IWrapper} interface,
* the cast will also be be tried on the unwrapped object (recursively).
*
* @param object The object to cast, may be null
* @param type The type to cast into, not null
*
* @return The casted object or null, if neither the object itself can be casted nor the unwrapped objects
*/
@SuppressWarnings("unchecked")
public static <TYPE> TYPE tryToCast(final Object object, final Class<TYPE> type) {
Assert.paramNotNull(type, "type");
if (object != null) {
if (type.isAssignableFrom(object.getClass())) {
return (TYPE) object;
}
else if (object instanceof IWrapper<?>) {
return tryToCast(((IWrapper<?>) object).unwrap(), type);
}
}
return null;
}
@SuppressWarnings("unchecked")
public static <TYPE> TYPE unwrap(final TYPE object) {
if (object instanceof IWrapper<?>) {
return (TYPE) unwrap(((IWrapper<?>) object).unwrap());
}
else {
return object;
}
}
public static boolean nullCompatibleEquivalence(final Object object1, final Object object2) {
return NullCompatibleEquivalence.equals(unwrap(object1), (unwrap(object2)));
}
}