io.datakernel.asm.Annotations Maven / Gradle / Ivy
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Extremely fast and space-efficient serializers, crafted using bytecode engineering.
/*
* Copyright (C) 2015 SoftIndex LLC.
*
* 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 io.datakernel.asm;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
@SuppressWarnings("unchecked")
public final class Annotations {
private Annotations() {
}
public static A findAnnotation(Class type, Annotation[] annotations) {
for (Annotation annotation : annotations) {
if (annotation.annotationType() == type)
return (A) annotation;
}
return null;
}
public static boolean annotated(Class type, Annotation[] annotations) {
return findAnnotation(type, annotations) != null;
}
public static boolean annotated(String annotationName, Annotation[] annotations) {
for (Annotation annotation : annotations) {
if (annotationName.equals(annotation.annotationType().getSimpleName()))
return true;
}
return false;
}
public static V annotationValue(Class type, Annotation[] annotations, V defaultValue) {
A a = findAnnotation(type, annotations);
if (a == null)
return defaultValue;
try {
Method value = type.getMethod("value");
return (V) value.invoke(a);
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}