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/**
* Copyright (C) 2008 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.inject.util;
import static com.google.inject.Asserts.assertContains;
import static com.google.inject.Asserts.assertEqualWhenReserialized;
import static com.google.inject.Asserts.assertEqualsBothWays;
import com.google.inject.TypeLiteral;
import com.google.inject.internal.MoreTypes;
import static com.google.inject.util.Types.subtypeOf;
import static com.google.inject.util.Types.supertypeOf;
import java.io.IOException;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.List;
import java.util.Map;
import java.util.Set;
import junit.framework.Assert;
import junit.framework.TestCase;
/**
* @author jessewilson@google.com (Jesse Wilson)
*/
public class TypesTest extends TestCase {
// generic types for comparison
Map<String, Integer> a;
Inner<Float, Double> b;
List<String[][]> c;
List<String> d;
Set<String> e;
Outer<String>.Inner f;
private ParameterizedType mapStringInteger;
private ParameterizedType innerFloatDouble;
private ParameterizedType listStringArray;
private ParameterizedType listString;
private ParameterizedType setString;
private GenericArrayType stringArray;
private ParameterizedType outerInner;
protected void setUp() throws Exception {
super.setUp();
mapStringInteger = (ParameterizedType) getClass().getDeclaredField("a").getGenericType();
innerFloatDouble = (ParameterizedType) getClass().getDeclaredField("b").getGenericType();
listStringArray = (ParameterizedType) getClass().getDeclaredField("c").getGenericType();
listString = (ParameterizedType) getClass().getDeclaredField("d").getGenericType();
setString = (ParameterizedType) getClass().getDeclaredField("e").getGenericType();
stringArray = (GenericArrayType) listStringArray.getActualTypeArguments()[0];
outerInner = (ParameterizedType) getClass().getDeclaredField("f").getGenericType();
}
public void testListSetMap() {
assertEqualsBothWays(mapStringInteger, Types.mapOf(String.class, Integer.class));
assertEqualsBothWays(listString, Types.listOf(String.class));
assertEqualsBothWays(setString, Types.setOf(String.class));
}
public void testDefensiveCopies() {
Type[] arguments = new Type[] { String.class, Integer.class };
ParameterizedType parameterizedType = Types.newParameterizedType(Map.class, arguments);
arguments[0] = null;
assertEquals(String.class, parameterizedType.getActualTypeArguments()[0]);
parameterizedType.getActualTypeArguments()[1] = null;
assertEquals(Integer.class, parameterizedType.getActualTypeArguments()[1]);
}
public void testTypeWithOwnerType() {
ParameterizedType actual = Types.newParameterizedTypeWithOwner(
TypesTest.class, Inner.class, Float.class, Double.class);
assertEquals(TypesTest.class, actual.getOwnerType());
assertEqualsBothWays(innerFloatDouble, actual);
// The JDK prints this out as:
// com.google.inject.util.TypesTest.com.google.inject.util.TypesTest$Inner<java.lang.Float, java.lang.Double>
// and we think that's wrong, so the assertEquals comparison is worthless. :-(
// assertEquals(innerFloatDouble.toString(), actual.toString());
// We think the correct comparison is:
assertEquals("com.google.inject.util.TypesTest$Inner<java.lang.Float, java.lang.Double>", actual.toString());
}
public void testTypeParametersMustNotBePrimitives() {
try {
Types.newParameterizedType(Map.class, String.class, int.class);
fail();
} catch (IllegalArgumentException expected) {
assertContains(expected.getMessage(),
"Primitive types are not allowed in type parameters: int");
}
}
public List<? extends CharSequence> wildcardExtends;
public List<? super CharSequence> wildcardSuper;
public List<?> wildcardObject;
public void testWildcardTypes() throws NoSuchFieldException, IOException {
assertEqualsBothWays(getWildcard("wildcardSuper"), supertypeOf(CharSequence.class));
assertEqualsBothWays(getWildcard("wildcardExtends"), subtypeOf(CharSequence.class));
assertEqualsBothWays(getWildcard("wildcardObject"), subtypeOf(Object.class));
assertEquals("? super java.lang.CharSequence", supertypeOf(CharSequence.class).toString());
assertEquals("? extends java.lang.CharSequence", subtypeOf(CharSequence.class).toString());
assertEquals("?", subtypeOf(Object.class).toString());
assertEqualWhenReserialized(supertypeOf(CharSequence.class));
assertEqualWhenReserialized(subtypeOf(CharSequence.class));
}
public void testWildcardBoundsMustNotBePrimitives() {
try {
supertypeOf(int.class);
fail();
} catch (IllegalArgumentException expected) {
assertContains(expected.getMessage(),
"Primitive types are not allowed in wildcard bounds: int");
}
try {
subtypeOf(int.class);
fail();
} catch (IllegalArgumentException expected) {
assertContains(expected.getMessage(),
"Primitive types are not allowed in wildcard bounds: int");
}
}
private WildcardType getWildcard(String fieldName) throws NoSuchFieldException {
ParameterizedType type = (ParameterizedType) getClass().getField(fieldName).getGenericType();
return (WildcardType) type.getActualTypeArguments()[0];
}
public void testEqualsAndHashcode() {
ParameterizedType parameterizedType
= Types.newParameterizedType(Map.class, String.class, Integer.class);
assertEqualsBothWays(mapStringInteger, parameterizedType);
assertEquals(mapStringInteger.toString(), parameterizedType.toString());
GenericArrayType genericArrayType = Types.arrayOf(
Types.arrayOf(String.class));
assertEqualsBothWays(stringArray, genericArrayType);
assertEquals(stringArray.toString(), genericArrayType.toString());
}
public void testToString() {
Assert.assertEquals("java.lang.String", MoreTypes.typeToString(String.class));
assertEquals("java.lang.String[][]", MoreTypes.typeToString(stringArray));
assertEquals("java.util.Map<java.lang.String, java.lang.Integer>",
MoreTypes.typeToString(mapStringInteger));
assertEquals("java.util.List<java.lang.String[][]>",
MoreTypes.typeToString(listStringArray));
assertEquals(innerFloatDouble.toString(),
MoreTypes.typeToString(innerFloatDouble));
}
static class Owning<A> {}
/**
* Ensure that owning types are required when necessary, and forbidden
* otherwise.
*/
public void testCanonicalizeRequiresOwnerTypes() throws NoSuchFieldException {
try {
Types.newParameterizedType(Owning.class, String.class);
fail();
} catch (IllegalArgumentException expected) {
assertContains(expected.getMessage(),
"No owner type for enclosed " + Owning.class);
}
try {
Types.newParameterizedTypeWithOwner(Object.class, Set.class, String.class);
} catch (IllegalArgumentException expected) {
assertContains(expected.getMessage(),
"Owner type for unenclosed " + Set.class);
}
}
@SuppressWarnings("UnusedDeclaration")
class Inner<T1, T2> {}
public void testInnerParameterizedEvenWithZeroArgs() {
TypeLiteral<Outer<String>.Inner> type = new TypeLiteral<Outer<String>.Inner>() {};
assertEqualsBothWays(outerInner, type.getType());
ParameterizedType parameterizedType = (ParameterizedType) type.getType();
assertEquals(0, parameterizedType.getActualTypeArguments().length);
assertEquals(new TypeLiteral<Outer<String>>() {}.getType(), parameterizedType.getOwnerType());
assertEquals(Outer.Inner.class, parameterizedType.getRawType());
}
static class Outer<T> {
class Inner {}
}
}
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