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/* | |
* 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.cxf.jaxrs.provider; | |
import java.util.ArrayList; | |
import java.util.Collections; | |
import java.util.List; | |
import java.util.function.Consumer; | |
import javax.ws.rs.ext.ContextResolver; | |
import javax.ws.rs.ext.MessageBodyReader; | |
import javax.ws.rs.ext.MessageBodyWriter; | |
import org.junit.Test; | |
import static java.util.Arrays.asList; | |
import static org.junit.Assert.assertEquals; | |
public class GenericArgumentComparatorTest { | |
/** | |
* The type parameters of each relate and have a clear inheritance order | |
*/ | |
@Test | |
public void simpleCase() { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class ShapeReader implements MessageBodyReader<Shape> { | |
} | |
abstract class CircleReader implements MessageBodyReader<Circle> { | |
} | |
abstract class ObjectReader implements MessageBodyReader<Object> { | |
} | |
final List<Class<?>> classes = classes(ShapeReader.class, CircleReader.class, ObjectReader.class); | |
assertOrder(MessageBodyReader.class, classes, "CircleReader\n" | |
+ "ShapeReader\n" | |
+ "ObjectReader"); | |
} | |
/** | |
* The parent implements the interface and the subclass defines the type | |
*/ | |
@Test | |
public void subclassDefinedParameter() { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class Resolver<T> implements ContextResolver<T> { | |
} | |
abstract class ShapeResolver extends Resolver<Shape> { | |
} | |
abstract class CircleResolver extends Resolver<Circle> { | |
} | |
abstract class ObjectResolver extends Resolver<Object> { | |
} | |
final List<Class<?>> classes = classes(ShapeResolver.class, CircleResolver.class, ObjectResolver.class); | |
assertOrder(ContextResolver.class, classes, "CircleResolver\n" | |
+ "ShapeResolver\n" | |
+ "ObjectResolver"); | |
} | |
/** | |
* The type parameters of one hasn't actually been defined | |
*/ | |
@Test | |
public void testUnspecifiedType() { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class ShapeReader implements MessageBodyReader<Shape> { | |
} | |
abstract class CircleReader implements MessageBodyReader<Circle> { | |
} | |
abstract class UnknownReader<T> implements MessageBodyReader<T> { | |
} | |
final List<Class<?>> classes = classes(ShapeReader.class, CircleReader.class, UnknownReader.class); | |
assertOrder(MessageBodyReader.class, classes, "CircleReader\n" | |
+ "ShapeReader\n" | |
+ "UnknownReader"); | |
} | |
/** | |
* The type parameters have a variable with bounds | |
*/ | |
@Test | |
public void boundedTypeVariable() { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class ShapeReader<T extends Shape> implements MessageBodyReader<T> { | |
} | |
abstract class CircleReader<T extends Circle> implements MessageBodyReader<T> { | |
} | |
abstract class ObjectReader implements MessageBodyReader<Object> { | |
} | |
final List<Class<?>> classes = classes(ShapeReader.class, CircleReader.class, ObjectReader.class); | |
assertOrder(MessageBodyReader.class, classes, "CircleReader\n" | |
+ "ShapeReader\n" | |
+ "ObjectReader"); | |
} | |
/** | |
* The type parameters of each have no relationship | |
*/ | |
@Test | |
public void noInheritance() { | |
class Red { | |
} | |
class Green { | |
} | |
class Blue { | |
} | |
abstract class RedReader implements MessageBodyReader<Red> { | |
} | |
abstract class GreenReader implements MessageBodyReader<Green> { | |
} | |
abstract class BlueReader implements MessageBodyReader<Blue> { | |
} | |
final List<Class<?>> classListA = asList(RedReader.class, GreenReader.class, BlueReader.class); | |
assertOrder(MessageBodyReader.class, classListA, "RedReader\n" | |
+ "GreenReader\n" | |
+ "BlueReader"); | |
final List<Class<?>> classListB = asList(GreenReader.class, RedReader.class, GreenReader.class, BlueReader.class); | |
assertOrder(MessageBodyReader.class, classListB, "GreenReader\n" | |
+ "RedReader\n" | |
+ "GreenReader\n" | |
+ "BlueReader"); | |
} | |
/** | |
* One item is not a MessageBodyReader and should sort to the bottom | |
*/ | |
@Test | |
public void oneTypeIsNotMessageBodyReader() { | |
class Shape { | |
} | |
abstract class ShapeReader implements MessageBodyReader<Shape> { | |
} | |
abstract class CircleReader { | |
} | |
abstract class ObjectReader implements MessageBodyReader<Object> { | |
} | |
final List<Class<?>> classes = classes(ShapeReader.class, CircleReader.class, ObjectReader.class); | |
assertOrder(MessageBodyReader.class, classes, "ShapeReader\n" | |
+ "ObjectReader\n" | |
+ "CircleReader"); | |
} | |
/** | |
* All items are equal in the first type parameter and can only be distinguished | |
* by their nested parameter types | |
*/ | |
@Test | |
public void nestedTypeArgument() throws Exception { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class ShapeReader implements MessageBodyReader<Consumer<Shape>> { | |
} | |
abstract class CircleReader implements MessageBodyReader<Consumer<Circle>> { | |
} | |
abstract class ObjectReader implements MessageBodyReader<Consumer<Object>> { | |
} | |
final List<Class<?>> classes = classes(ShapeReader.class, CircleReader.class, ObjectReader.class); | |
assertOrder(MessageBodyReader.class, classes, "CircleReader\n" | |
+ "ShapeReader\n" | |
+ "ObjectReader"); | |
} | |
/** | |
* All items are equal in the first type parameter and can only be distinguished | |
* by their nested parameter types. Also the type is defined by the subclasses. | |
*/ | |
@Test | |
public void nestedTypeArgumentSubclass() throws Exception { | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class Writer<T> implements MessageBodyWriter<Consumer<T>> { | |
} | |
abstract class ShapeWriter extends Writer<Shape> { | |
} | |
abstract class CircleWriter extends Writer<Circle> { | |
} | |
abstract class ObjectWriter extends Writer<Object> { | |
} | |
final List<Class<?>> classes = classes(ShapeWriter.class, CircleWriter.class, ObjectWriter.class); | |
assertOrder(MessageBodyWriter.class, classes, "CircleWriter\n" | |
+ "ShapeWriter\n" | |
+ "ObjectWriter"); | |
} | |
/** | |
* Don't just grab the first generics we see, they must map directly or | |
* indirectly back to the interface we are interested in | |
*/ | |
@Test | |
public void unrelatedGenericsAreIgnored() throws Exception { | |
class Color { | |
} | |
class Red extends Color { | |
} | |
class Crimson extends Red { | |
} | |
class Shape { | |
} | |
class Circle extends Shape { | |
} | |
abstract class Writer<T> implements MessageBodyWriter<Consumer<T>> { | |
} | |
abstract class ShapeWriter<T> extends Writer<Shape> implements ContextResolver<T> { | |
} | |
abstract class CircleWriter extends Writer<Circle> { | |
} | |
abstract class ObjectWriter extends Writer<Object> { | |
} | |
abstract class SpecialCircleWriter extends CircleWriter implements ContextResolver<Color> { | |
} | |
abstract class SpecialShapeWriter extends ShapeWriter<Red> { | |
} | |
abstract class SpecialObjectWriter extends ObjectWriter implements ContextResolver<Crimson> { | |
} | |
final List<Class<?>> classes = classes(SpecialObjectWriter.class, SpecialCircleWriter.class, SpecialShapeWriter.class); | |
assertOrder(MessageBodyWriter.class, classes, "SpecialCircleWriter\n" | |
+ "SpecialShapeWriter\n" | |
+ "SpecialObjectWriter"); | |
} | |
public static List<Class<?>> classes(final Class<?>... classes) { | |
final List<Class<?>> list = new ArrayList<Class<?>>(asList(classes)); | |
Collections.shuffle(list); | |
return list; | |
} | |
public static void assertOrder(final Class<?> genericInterface, | |
final List<Class<?>> classes, | |
final String expected) { | |
final GenericArgumentComparator comparator = new GenericArgumentComparator(genericInterface); | |
classes.sort(comparator); | |
final String order = classes.stream() | |
.map(Class::getSimpleName) | |
.reduce((s, s2) -> s + "\n" + s2) | |
.get(); | |
assertEquals(expected, order); | |
} | |
} |
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