/*
* Copyright 2002-2014 the original author or authors.
*
* 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.springframework.util;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import junit.framework.TestCase;
/**
* Unit tests for {@link TypeUtils}.
*
* @author Juergen Hoeller
* @author Chris Beams
* @author Roy Clarkson
*/
public class TypeUtilsTests extends TestCase {
public static Object object;
public static String string;
public static Integer number;
public static List<Object> objects;
public static List<String> strings;
public static List<? extends Object> openObjects;
public static List<? extends Number> openNumbers;
public static List<? super Object> storableObjectList;
public static List<Number>[] array;
public static List<? extends Number>[] openArray;
public void testWithClasses() {
assertTrue(TypeUtils.isAssignable(Object.class, Object.class));
assertTrue(TypeUtils.isAssignable(Object.class, String.class));
assertFalse(TypeUtils.isAssignable(String.class, Object.class));
assertTrue(TypeUtils.isAssignable(List.class, List.class));
assertTrue(TypeUtils.isAssignable(List.class, LinkedList.class));
assertFalse(TypeUtils.isAssignable(List.class, Collection.class));
assertFalse(TypeUtils.isAssignable(List.class, HashSet.class));
}
public void testWithParameterizedTypes() throws Exception {
Type objectsType = getClass().getField("objects").getGenericType();
Type openObjectsType = getClass().getField("openObjects").getGenericType();
Type stringsType = getClass().getField("strings").getGenericType();
assertTrue(TypeUtils.isAssignable(Object.class, objectsType));
assertTrue(TypeUtils.isAssignable(Object.class, openObjectsType));
assertTrue(TypeUtils.isAssignable(Object.class, stringsType));
assertTrue(TypeUtils.isAssignable(List.class, objectsType));
assertTrue(TypeUtils.isAssignable(List.class, openObjectsType));
assertTrue(TypeUtils.isAssignable(List.class, stringsType));
assertTrue(TypeUtils.isAssignable(objectsType, List.class));
assertTrue(TypeUtils.isAssignable(openObjectsType, List.class));
assertTrue(TypeUtils.isAssignable(stringsType, List.class));
assertTrue(TypeUtils.isAssignable(objectsType, objectsType));
assertTrue(TypeUtils.isAssignable(openObjectsType, openObjectsType));
assertTrue(TypeUtils.isAssignable(stringsType, stringsType));
assertTrue(TypeUtils.isAssignable(openObjectsType, objectsType));
assertTrue(TypeUtils.isAssignable(openObjectsType, stringsType));
assertFalse(TypeUtils.isAssignable(stringsType, objectsType));
assertFalse(TypeUtils.isAssignable(objectsType, stringsType));
}
public void testWithWildcardTypes() throws Exception {
ParameterizedType openObjectsType = (ParameterizedType) getClass().getField("openObjects").getGenericType();
ParameterizedType openNumbersType = (ParameterizedType) getClass().getField("openNumbers").getGenericType();
Type storableObjectListType = getClass().getField("storableObjectList").getGenericType();
Type objectType = getClass().getField("object").getGenericType();
Type numberType = getClass().getField("number").getGenericType();
Type stringType = getClass().getField("string").getGenericType();
Type openWildcard = openObjectsType.getActualTypeArguments()[0]; // '?'
Type openNumbersWildcard = openNumbersType.getActualTypeArguments()[0]; // '? extends number'
assertTrue(TypeUtils.isAssignable(openWildcard, objectType));
assertTrue(TypeUtils.isAssignable(openNumbersWildcard, numberType));
assertFalse(TypeUtils.isAssignable(openNumbersWildcard, stringType));
assertFalse(TypeUtils.isAssignable(storableObjectListType, openObjectsType));
}
public void testWithGenericArrayTypes() throws Exception {
Type arrayType = getClass().getField("array").getGenericType();
Type openArrayType = getClass().getField("openArray").getGenericType();
assertTrue(TypeUtils.isAssignable(Object.class, arrayType));
assertTrue(TypeUtils.isAssignable(Object.class, openArrayType));
assertTrue(TypeUtils.isAssignable(List[].class, arrayType));
assertTrue(TypeUtils.isAssignable(List[].class, openArrayType));
assertTrue(TypeUtils.isAssignable(arrayType, List[].class));
assertTrue(TypeUtils.isAssignable(openArrayType, List[].class));
assertTrue(TypeUtils.isAssignable(arrayType, arrayType));
assertTrue(TypeUtils.isAssignable(openArrayType, openArrayType));
assertTrue(TypeUtils.isAssignable(openArrayType, arrayType));
}
}