org.jboss.weld.util.Observers Maven / Gradle / Ivy
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* Copyright 2008, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.weld.util;
import org.jboss.weld.exceptions.IllegalArgumentException;
import org.jboss.weld.util.reflection.HierarchyDiscovery;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import static org.jboss.weld.logging.messages.UtilMessage.EVENT_TYPE_NOT_ALLOWED;
import static org.jboss.weld.logging.messages.UtilMessage.TYPE_PARAMETER_NOT_ALLOWED_IN_EVENT_TYPE;
/**
* @author pmuir
*/
public class Observers {
public static void checkEventObjectType(Type eventType) {
Type[] types;
Type resolvedType = new HierarchyDiscovery(eventType).getResolvedType();
if (resolvedType instanceof Class) {
types = new Type[0];
} else if (resolvedType instanceof ParameterizedType) {
types = ((ParameterizedType) resolvedType).getActualTypeArguments();
} else {
throw new IllegalArgumentException(EVENT_TYPE_NOT_ALLOWED, resolvedType);
}
for (Type type : types) {
if (type instanceof TypeVariable) {
throw new IllegalArgumentException(TYPE_PARAMETER_NOT_ALLOWED_IN_EVENT_TYPE, resolvedType);
}
}
}
public static void checkEventObjectType(Object event) {
checkEventObjectType(event.getClass());
}
}