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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.android.desugar;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import com.google.devtools.build.android.desugar.testdata.ClassCallingRequireNonNull;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This test case tests the desugaring feature for Objects.requireNonNull. This feature replaces any
* call to this method with o.getClass() to check whether 'o' is null.
*/
@RunWith(JUnit4.class)
public class DesugarObjectsRequireNonNullTest {
@Test
public void testClassCallingRequireNonNullHasNoReferenceToRequiresNonNull() {
try {
ClassReader reader = new ClassReader(ClassCallingRequireNonNull.class.getName());
AtomicInteger counterForSingleArgument = new AtomicInteger(0);
AtomicInteger counterForString = new AtomicInteger(0);
AtomicInteger counterForSupplier = new AtomicInteger(0);
reader.accept(
new ClassVisitor(Opcodes.ASM5) {
@Override
public MethodVisitor visitMethod(
int access, String name, String desc, String signature, String[] exceptions) {
return new MethodVisitor(api) {
@Override
public void visitMethodInsn(
int opcode, String owner, String name, String desc, boolean itf) {
if (opcode == INVOKESTATIC
&& owner.equals("java/util/Objects")
&& name.equals("requireNonNull")) {
switch (desc) {
case "(Ljava/lang/Object;)Ljava/lang/Object;":
counterForSingleArgument.incrementAndGet();
break;
case "(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;":
counterForString.incrementAndGet();
break;
case "(Ljava/lang/Object;Ljava/util/function/Supplier;)Ljava/lang/Object;":
counterForSupplier.incrementAndGet();
break;
default:
fail("Unknown overloaded requireNonNull is found: " + desc);
}
}
}
};
}
},
0);
assertThat(counterForSingleArgument.get()).isEqualTo(0);
// we do not desugar requireNonNull(Object, String) or requireNonNull(Object, Supplier)
assertThat(counterForString.get()).isEqualTo(1);
assertThat(counterForSupplier.get()).isEqualTo(1);
} catch (IOException e) {
fail();
}
}
@Test
public void testInliningImplicitCallToObjectsRequireNonNull() {
try {
ClassCallingRequireNonNull.getStringLengthWithMethodReference(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
assertThat(ClassCallingRequireNonNull.getStringLengthWithMethodReference("")).isEqualTo(0);
assertThat(ClassCallingRequireNonNull.getStringLengthWithMethodReference("1")).isEqualTo(1);
try {
ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
assertThat(
ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(""))
.isEqualTo(0);
assertThat(
ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(
"1"))
.isEqualTo(1);
}
@Test
public void testInliningExplicitCallToObjectsRequireNonNull() {
try {
ClassCallingRequireNonNull.getFirstCharVersionOne(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
try {
ClassCallingRequireNonNull.getFirstCharVersionTwo(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
try {
ClassCallingRequireNonNull.callRequireNonNullWithArgumentString(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
try {
ClassCallingRequireNonNull.callRequireNonNullWithArgumentSupplier(null);
fail ("NullPointerException expected");
} catch (NullPointerException e) {
// Expected
}
assertThat(ClassCallingRequireNonNull.getFirstCharVersionOne("hello")).isEqualTo('h');
assertThat(ClassCallingRequireNonNull.getFirstCharVersionTwo("hello")).isEqualTo('h');
assertThat(ClassCallingRequireNonNull.callRequireNonNullWithArgumentString("hello"))
.isEqualTo('h');
assertThat(ClassCallingRequireNonNull.callRequireNonNullWithArgumentSupplier("hello"))
.isEqualTo('h');
}
}
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