forked from google/gson
/
TypeTokenTest.java
160 lines (138 loc) · 6.35 KB
/
TypeTokenTest.java
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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.Map;
import java.util.RandomAccess;
import java.util.Set;
import junit.framework.TestCase;
/**
* @author Jesse Wilson
*/
public final class TypeTokenTest extends TestCase {
// These fields are accessed using reflection by the tests below
List<Integer> listOfInteger = null;
List<Number> listOfNumber = null;
List<String> listOfString = null;
List<?> listOfUnknown = null;
List<Set<String>> listOfSetOfString = null;
List<Set<?>> listOfSetOfUnknown = null;
@SuppressWarnings({"deprecation"})
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));
}
@SuppressWarnings({"deprecation"})
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));
}
@SuppressWarnings({"deprecation"})
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));
}
@SuppressWarnings({"deprecation"})
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));
}
public void testArrayFactory() {
TypeToken<?> expectedStringArray = new TypeToken<String[]>() {};
assertEquals(expectedStringArray, TypeToken.getArray(String.class));
TypeToken<?> expectedListOfStringArray = new TypeToken<List<String>[]>() {};
Type listOfString = new TypeToken<List<String>>() {}.getType();
assertEquals(expectedListOfStringArray, TypeToken.getArray(listOfString));
}
public void testParameterizedFactory() {
TypeToken<?> expectedListOfString = new TypeToken<List<String>>() {};
assertEquals(expectedListOfString, TypeToken.getParameterized(List.class, String.class));
TypeToken<?> expectedMapOfStringToString = new TypeToken<Map<String, String>>() {};
assertEquals(expectedMapOfStringToString, TypeToken.getParameterized(Map.class, String.class, String.class));
TypeToken<?> expectedListOfListOfListOfString = new TypeToken<List<List<List<String>>>>() {};
Type listOfString = TypeToken.getParameterized(List.class, String.class).getType();
Type listOfListOfString = TypeToken.getParameterized(List.class, listOfString).getType();
assertEquals(expectedListOfListOfListOfString, TypeToken.getParameterized(List.class, listOfListOfString));
}
private static class CustomTypeToken extends TypeToken<String> {
}
public void testTypeTokenNonAnonymousSubclass() {
TypeToken<?> typeToken = new CustomTypeToken();
assertEquals(String.class, typeToken.getRawType());
assertEquals(String.class, typeToken.getType());
}
/**
* User must only create direct subclasses of TypeToken, but not subclasses
* of subclasses (...) of TypeToken.
*/
public void testTypeTokenSubSubClass() {
class SubTypeToken<T> extends TypeToken<String> {}
class SubSubTypeToken1<T> extends SubTypeToken<T> {}
class SubSubTypeToken2 extends SubTypeToken<Integer> {}
try {
new SubTypeToken<Integer>() {};
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
try {
new SubSubTypeToken1<Integer>();
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
try {
new SubSubTypeToken2();
fail();
} catch (IllegalStateException expected) {
assertEquals("Must only create direct subclasses of TypeToken", expected.getMessage());
}
}
@SuppressWarnings("rawtypes")
public void testTypeTokenRaw() {
try {
new TypeToken() {};
fail();
} catch (IllegalStateException expected) {
assertEquals("TypeToken must be created with a type argument: new TypeToken<...>() {}; "
+ "When using code shrinkers (ProGuard, R8, ...) make sure that generic signatures are preserved.",
expected.getMessage());
}
}
}