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/*
* Copyright (C) 2010 Google Inc.
*
* 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 com.google.gson.reflect;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.RandomAccess;
import java.util.Set;
import junit.framework.TestCase;
/**
* @author Jesse Wilson
*/
@SuppressWarnings({"deprecation"})
public final class TypeTokenTest extends TestCase {
List<Integer> listOfInteger = null;
List<Number> listOfNumber = null;
List<String> listOfString = null;
List<?> listOfUnknown = null;
List<Set<String>> listOfSetOfString = null;
List<Set<?>> listOfSetOfUnknown = null;
public void testIsAssignableFromRawTypes() {
assertTrue(TypeToken.get(Object.class).isAssignableFrom(String.class));
assertFalse(TypeToken.get(String.class).isAssignableFrom(Object.class));
assertTrue(TypeToken.get(RandomAccess.class).isAssignableFrom(ArrayList.class));
assertFalse(TypeToken.get(ArrayList.class).isAssignableFrom(RandomAccess.class));
}
public void testIsAssignableFromWithTypeParameters() throws Exception {
Type a = getClass().getDeclaredField("listOfInteger").getGenericType();
Type b = getClass().getDeclaredField("listOfNumber").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfInteger = listOfNumber; // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
// listOfNumber = listOfInteger; // doesn't compile; must be false
assertFalse(TypeToken.get(b).isAssignableFrom(a));
}
public void testIsAssignableFromWithBasicWildcards() throws Exception {
Type a = getClass().getDeclaredField("listOfString").getGenericType();
Type b = getClass().getDeclaredField("listOfUnknown").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfString = listOfUnknown // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
listOfUnknown = listOfString; // compiles; must be true
// The following assertion is too difficult to support reliably, so disabling
// assertTrue(TypeToken.get(b).isAssignableFrom(a));
}
public void testIsAssignableFromWithNestedWildcards() throws Exception {
Type a = getClass().getDeclaredField("listOfSetOfString").getGenericType();
Type b = getClass().getDeclaredField("listOfSetOfUnknown").getGenericType();
assertTrue(TypeToken.get(a).isAssignableFrom(a));
assertTrue(TypeToken.get(b).isAssignableFrom(b));
// listOfSetOfString = listOfSetOfUnknown; // doesn't compile; must be false
assertFalse(TypeToken.get(a).isAssignableFrom(b));
// listOfSetOfUnknown = listOfSetOfString; // doesn't compile; must be false
assertFalse(TypeToken.get(b).isAssignableFrom(a));
}
}
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