reactor.bus.selector.ClassSelector Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2014 Pivotal Software, Inc.
*
* 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 reactor.bus.selector;
/**
* Implementation of {@link Selector} that uses {@link Class#isAssignableFrom(Class)} to determine a match.
*
* @author Jon Brisbin
* @author Andy Wilkinson
* @author Stephane Maldini
*/
public class ClassSelector extends ObjectSelector> {
/**
* Creates a new ClassSelector that will match keys that are the same as, or are a
* super type of the given {@code type}, i.e. the key is assignable according to
* {@link Class#isAssignableFrom(Class)}.
*
* @param type The type to match
*/
public ClassSelector(Class type) {
super(type);
}
/**
* Creates a {@code ClassSelector} based on the given class type that only matches if the
* key being matched is assignable according to {@link Class#isAssignableFrom(Class)}.
*
* @param supertype The supertype to compare.
*
* @return The new {@link Selector}.
*/
public static Selector typeSelector(Class supertype) {
return new ClassSelector(supertype);
}
@Override
public boolean matches(Object key) {
return (Class.class.isInstance(key) && getObject().isAssignableFrom((Class) key)) ||
getObject().isAssignableFrom(key.getClass());
}
}