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org.apache.camel.cdi.CdiSpiHelper Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.cdi;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.Objects;
import java.util.Set;
import java.util.StringJoiner;
import java.util.function.Predicate;
import java.util.stream.Stream;
import static java.security.AccessController.doPrivileged;
import static java.util.Comparator.comparing;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toSet;
import javax.enterprise.inject.spi.Annotated;
import javax.enterprise.inject.spi.AnnotatedConstructor;
import javax.enterprise.inject.spi.AnnotatedField;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.util.Nonbinding;
import static org.apache.camel.cdi.AnyLiteral.ANY;
import static org.apache.camel.cdi.DefaultLiteral.DEFAULT;
@Vetoed
final class CdiSpiHelper {
private CdiSpiHelper() {
}
static Predicate hasType(Type type) {
requireNonNull(type);
return bean -> bean.getTypes().contains(type);
}
static Predicate isAnnotationType(Class clazz) {
requireNonNull(clazz);
return annotation -> clazz.equals(annotation.annotationType());
}
static Class getRawType(Type type) {
if (type instanceof Class) {
return Class.class.cast(type);
} else if (type instanceof ParameterizedType) {
return getRawType(ParameterizedType.class.cast(type).getRawType());
} else if (type instanceof TypeVariable) {
return getBound(TypeVariable.class.cast(type).getBounds());
} else if (type instanceof WildcardType) {
return getBound(WildcardType.class.cast(type).getUpperBounds());
} else if (type instanceof GenericArrayType) {
Class rawType = getRawType(GenericArrayType.class.cast(type).getGenericComponentType());
if (rawType != null) {
return Array.newInstance(rawType, 0).getClass();
}
}
throw new UnsupportedOperationException("Unable to retrieve raw type for [" + type + "]");
}
private static Class getBound(Type[] bounds) {
if (bounds.length == 0) {
return Object.class;
} else {
return getRawType(bounds[0]);
}
}
@SafeVarargs
static boolean hasAnnotation(AnnotatedType type, Class... annotations) {
return Stream.of(annotations)
.anyMatch(annotation -> hasAnnotation(type, annotation));
}
static boolean hasAnnotation(AnnotatedType type, Class annotation) {
if (type.isAnnotationPresent(annotation)) {
return true;
}
for (AnnotatedMethod method : type.getMethods()) {
if (method.isAnnotationPresent(annotation)) {
return true;
}
}
for (AnnotatedConstructor constructor : type.getConstructors()) {
if (constructor.isAnnotationPresent(annotation)) {
return true;
}
}
for (AnnotatedField field : type.getFields()) {
if (field.isAnnotationPresent(annotation)) {
return true;
}
}
return false;
}
static Set getQualifiers(Annotated annotated, BeanManager manager) {
return annotated.getAnnotations().stream()
.filter(annotation -> manager.isQualifier(annotation.annotationType()))
.collect(collectingAndThen(toSet(),
qualifiers -> {
if (qualifiers.isEmpty()) {
qualifiers.add(DEFAULT);
}
qualifiers.add(ANY);
return qualifiers;
})
);
}
/**
* Generates a unique signature for {@link Bean}.
*/
static String createBeanId(Bean bean) {
return Stream.of(bean.getName(),
bean.getScope().getName(),
createAnnotationCollectionId(bean.getQualifiers()),
createTypeCollectionId(bean.getTypes()))
.filter(Objects::nonNull)
.collect(joining(","));
}
/**
* Generates a unique signature of a collection of types.
*/
private static String createTypeCollectionId(Collection types) {
return types.stream()
.sorted(comparing(CdiSpiHelper::createTypeId))
.map(CdiSpiHelper::createTypeId)
.collect(joining(",", "[", "]"));
}
/**
* Generates a unique signature for a {@link Type}.
*/
private static String createTypeId(Type type) {
if (type instanceof Class) {
return Class.class.cast(type).getName();
}
if (type instanceof ParameterizedType) {
return createTypeId(((ParameterizedType) type).getRawType())
+ Stream.of(((ParameterizedType) type).getActualTypeArguments())
.map(CdiSpiHelper::createTypeId)
.collect(joining(",", "<", ">"));
}
if (type instanceof TypeVariable) {
return TypeVariable.class.cast(type).getName();
}
if (type instanceof GenericArrayType) {
return createTypeId(GenericArrayType.class.cast(type).getGenericComponentType());
}
throw new UnsupportedOperationException("Unable to create type id for type [" + type + "]");
}
/**
* Generates a unique signature for a collection of annotations.
*/
private static String createAnnotationCollectionId(Collection annotations) {
if (annotations.isEmpty()) {
return "";
}
return annotations.stream()
.sorted(comparing(a -> a.annotationType().getName()))
.map(CdiSpiHelper::createAnnotationId)
.collect(joining(",", "[", "]"));
}
/**
* Generates a unique signature for an {@link Annotation}.
*/
static String createAnnotationId(Annotation annotation) {
Method[] methods = doPrivileged(
(PrivilegedAction) () -> annotation.annotationType().getDeclaredMethods());
return Stream.of(methods)
.filter(method -> !method.isAnnotationPresent(Nonbinding.class))
.sorted(comparing(Method::getName))
.collect(() -> new StringJoiner(",", "@" + annotation.annotationType().getCanonicalName() + "(", ")"),
(joiner, method) -> {
try {
joiner.add(method.getName() + "=" + method.invoke(annotation).toString());
} catch (NullPointerException | IllegalArgumentException | IllegalAccessException | InvocationTargetException cause) {
throw new RuntimeException(
"Error while accessing member [" + method.getName() + "]"
+ " of annotation [" + annotation.annotationType().getName() + "]", cause);
}
},
StringJoiner::merge)
.toString();
}
}
