com.speedment.runtime.field.internal.util.Cast Maven / Gradle / Ivy
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A Speedment bundle that shades all dependencies into one jar. This is
useful when deploying an application on a server.
/**
*
* Copyright (c) 2006-2019, Speedment, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); You may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.speedment.runtime.field.internal.util;
import java.util.NoSuchElementException;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
/**
*
* @author Per Minborg
*/
public final class Cast {
private Cast() {}
/**
* Casts and returns the provided object if it is assignable from the given
* class, otherwise returns an Optional.empty().
*
* @param the type to return
* @param object to cast
* @param clazz to cast to
* @return An Optional of the casted element or Optional.empty()
*/
public static Optional cast(Object object, Class clazz) {
requireNonNull(clazz);
if (object == null) {
return Optional.empty();
}
if (clazz.isAssignableFrom(object.getClass())) {
final T result = clazz.cast(object);
return Optional.of(result);
}
return Optional.empty();
}
/**
* Casts and returns the provided object to the provided class.
*
* @param the type to return
* @param object to cast
* @param clazz to cast to
* @return the casted element
* @throws NoSuchElementException if the object could not be casted to the
* provided class
*/
public static T castOrFail(Object object, Class clazz) {
requireNonNull(clazz);
if (object == null) {
throw new NoSuchElementException("null is not an instance of " + clazz.getName());
}
return Optional.of(object)
.filter(o -> clazz.isAssignableFrom(o.getClass()))
.map(clazz::cast)
.orElseThrow(NoSuchElementException::new);
}
}