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/**
* Copyright (C) 2006 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;
import static com.google.inject.Asserts.assertEqualsBothWays;
import static com.google.inject.Asserts.assertNotSerializable;
import com.google.common.collect.ImmutableList;
import com.google.inject.util.Types;
import java.io.IOException;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.List;
import junit.framework.TestCase;
/**
* @author crazybob@google.com (Bob Lee)
*/
public class TypeLiteralTest extends TestCase {
public void testWithParameterizedType() {
TypeLiteral<List<String>> a = new TypeLiteral<List<String>>() {};
TypeLiteral<List<String>> b = new TypeLiteral<List<String>>(
Types.listOf(String.class)) {};
assertEqualsBothWays(a, b);
}
public void testEquality() {
TypeLiteral<List<String>> t1 = new TypeLiteral<List<String>>() {};
TypeLiteral<List<String>> t2 = new TypeLiteral<List<String>>() {};
TypeLiteral<List<Integer>> t3 = new TypeLiteral<List<Integer>>() {};
TypeLiteral<String> t4 = new TypeLiteral<String>() {};
assertEqualsBothWays(t1, t2);
assertFalse(t2.equals(t3));
assertFalse(t3.equals(t2));
assertFalse(t2.equals(t4));
assertFalse(t4.equals(t2));
TypeLiteral<String> t5 = TypeLiteral.get(String.class);
assertEqualsBothWays(t4, t5);
}
public List<? extends CharSequence> wildcardExtends;
public void testWithWildcardType() throws NoSuchFieldException, IOException {
TypeLiteral<?> a = TypeLiteral.get(getClass().getField("wildcardExtends").getGenericType());
TypeLiteral<?> b = TypeLiteral.get(Types.listOf(Types.subtypeOf(CharSequence.class)));
TypeLiteral<?> c = new TypeLiteral<List<? extends CharSequence>>() {};
assertEqualsBothWays(a, b);
assertEqualsBothWays(b, c);
assertEquals("java.util.List<? extends java.lang.CharSequence>", a.toString());
assertEquals("java.util.List<? extends java.lang.CharSequence>", b.toString());
assertEquals("java.util.List<? extends java.lang.CharSequence>", c.toString());
assertNotSerializable(a);
assertNotSerializable(b);
assertNotSerializable(c);
}
public void testMissingTypeParameter() {
try {
new TypeLiteral() {};
fail();
} catch (RuntimeException e) { /* expected */ }
}
public void testTypesInvolvingArraysForEquality() {
TypeLiteral<String[]> stringArray = new TypeLiteral<String[]>() {};
assertEquals(stringArray, new TypeLiteral<String[]>() {});
TypeLiteral<List<String[]>> listOfStringArray
= new TypeLiteral<List<String[]>>() {};
assertEquals(listOfStringArray, new TypeLiteral<List<String[]>>() {});
}
public void testEqualityOfGenericArrayAndClassArray() {
TypeLiteral<String[]> arrayAsClass = TypeLiteral.get(String[].class);
TypeLiteral<String[]> arrayAsType = new TypeLiteral<String[]>() {};
assertEquals(arrayAsClass, arrayAsType);
}
public void testEqualityOfMultidimensionalGenericArrayAndClassArray() {
TypeLiteral<String[][][]> arrayAsClass = TypeLiteral.get(String[][][].class);
TypeLiteral<String[][][]> arrayAsType = new TypeLiteral<String[][][]>() {};
assertEquals(arrayAsClass, arrayAsType);
}
public void testTypeLiteralsMustHaveRawTypes() {
try {
TypeLiteral.get(Types.subtypeOf(Runnable.class));
fail();
} catch (IllegalArgumentException expected) {
Asserts.assertContains(expected.getMessage(), "Expected a Class, ParameterizedType, or "
+ "GenericArrayType, but <? extends java.lang.Runnable> is of type "
+ "com.google.inject.internal.MoreTypes$WildcardTypeImpl");
}
}
/**
* Unlike Key, TypeLiteral retains full type information and differentiates
* between {@code int.class} and {@code Integer.class}.
*/
public void testDifferentiationBetweenWrappersAndPrimitives() {
Class[] primitives = new Class[] {
boolean.class, byte.class, short.class, int.class, long.class,
float.class, double.class, char.class, void.class
};
Class[] wrappers = new Class[] {
Boolean.class, Byte.class, Short.class, Integer.class, Long.class,
Float.class, Double.class, Character.class, Void.class
};
for (int t = 0; t < primitives.length; t++) {
@SuppressWarnings("unchecked")
TypeLiteral primitiveTl = TypeLiteral.get(primitives[t]);
@SuppressWarnings("unchecked")
TypeLiteral wrapperTl = TypeLiteral.get(wrappers[t]);
assertFalse(primitiveTl.equals(wrapperTl));
assertEquals(primitives[t], primitiveTl.getType());
assertEquals(wrappers[t], wrapperTl.getType());
assertEquals(primitives[t], primitiveTl.getRawType());
assertEquals(wrappers[t], wrapperTl.getRawType());
}
}
public void testSerialization() throws IOException {
assertNotSerializable(new TypeLiteral<List<String>>() {});
}
public void testTypeVariableWithNoBound() {
TypeVariable<Class<HasTypeParameters>>[] typeVariables
= HasTypeParameters.class.getTypeParameters();
TypeLiteral<?> aTl = TypeLiteral.get(typeVariables[0]);
assertEquals(Object.class, aTl.getRawType());
assertEquals("A", aTl.toString());
TypeVariable<?> aTv = (TypeVariable) aTl.getType();
assertEquals(HasTypeParameters.class, aTv.getGenericDeclaration());
assertEquals("A", aTv.getName());
assertEquals(ImmutableList.<Type>of(Object.class), ImmutableList.of(aTv.getBounds()));
assertEquals("A", aTv.toString());
assertEqualsBothWays(aTl, TypeLiteral.get(HasTypeParameters.class.getTypeParameters()[0]));
}
public void testTypeVariablesWithSingleBound() {
TypeVariable<Class<HasTypeParameters>>[] typeVariables
= HasTypeParameters.class.getTypeParameters();
TypeLiteral<?> cTl = TypeLiteral.get(typeVariables[2]);
assertEquals(Object.class, cTl.getRawType());
assertEquals("C", cTl.toString());
TypeVariable<?> cTv = (TypeVariable) cTl.getType();
assertEquals(HasTypeParameters.class, cTv.getGenericDeclaration());
assertEquals("C", cTv.getName());
assertEquals(ImmutableList.<Type>of(Runnable.class), ImmutableList.of(cTv.getBounds()));
assertEquals("C", cTv.toString());
assertEqualsBothWays(cTl, TypeLiteral.get(HasTypeParameters.class.getTypeParameters()[2]));
}
public void testTypeVariableWithMultipleBounds() {
TypeVariable<Class<HasTypeParameters>>[] typeVariables
= HasTypeParameters.class.getTypeParameters();
TypeLiteral<?> bTl = TypeLiteral.get(typeVariables[1]);
assertEquals(Object.class, bTl.getRawType());
assertEquals("B", bTl.toString());
TypeVariable<?> bTv = (TypeVariable) bTl.getType();
assertEquals(HasTypeParameters.class, bTv.getGenericDeclaration());
assertEquals("B", bTv.getName());
assertEquals(ImmutableList.<Type>of(Types.listOf(typeVariables[0]), Runnable.class),
ImmutableList.of(bTv.getBounds()));
assertEquals("B", bTv.toString());
assertEqualsBothWays(bTl, TypeLiteral.get(HasTypeParameters.class.getTypeParameters()[1]));
}
class HasTypeParameters<A, B extends List<A> & Runnable, C extends Runnable> {
A a; B b; C c;
}
}
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