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AdviceCustomAnnotationOnFieldTest.java
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/
AdviceCustomAnnotationOnFieldTest.java
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package net.bytebuddy.asm;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.description.field.FieldDescription;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Arrays;
import java.util.Collection;
import static net.bytebuddy.matcher.ElementMatchers.named;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;
@RunWith(Parameterized.class)
public class AdviceCustomAnnotationOnFieldTest {
private static final String FOO = "foo";
@Parameterized.Parameters
public static Collection<Object[]> data() {
return Arrays.asList(new Object[][]{
{BooleanValue.class, false},
{ByteValue.class, (byte) 0},
{ShortValue.class, (short) 0},
{CharacterValue.class, (char) 0},
{IntegerValue.class, 0},
{LongValue.class, 0L},
{FloatValue.class, 0f},
{DoubleValue.class, 0d},
{ReferenceValue.class, FOO},
});
}
private final Class<?> target;
private final Object expected;
public AdviceCustomAnnotationOnFieldTest(Class<?> target, Object expected) {
this.target = target;
this.expected = expected;
}
@Test
public void testPrimitiveField() throws Exception {
Class<?> type = new ByteBuddy()
.redefine(target)
.visit(Advice.withCustomMapping()
.bind(FieldValue.class, new FieldDescription.ForLoadedField(target.getDeclaredField(FOO)))
.to(target)
.on(named(FOO)))
.make()
.load(ClassLoadingStrategy.BOOTSTRAP_LOADER, ClassLoadingStrategy.Default.WRAPPER)
.getLoaded();
assertThat(type.getDeclaredMethod(FOO).invoke(type.getDeclaredConstructor().newInstance()), is(expected));
}
@Test
public void testBoxedField() throws Exception {
Class<?> type = new ByteBuddy()
.redefine(target)
.visit(Advice.withCustomMapping()
.bind(FieldValue.class, new FieldDescription.ForLoadedField(target.getDeclaredField(FOO)))
.to(BoxedFieldAdvice.class)
.on(named(FOO)))
.make()
.load(ClassLoadingStrategy.BOOTSTRAP_LOADER, ClassLoadingStrategy.Default.WRAPPER)
.getLoaded();
assertThat(type.getDeclaredMethod(FOO).invoke(type.getDeclaredConstructor().newInstance()), is(expected));
}
public static class BoxedFieldAdvice {
@Advice.OnMethodExit
static void exit(@FieldValue Object value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
@Retention(RetentionPolicy.RUNTIME)
public @interface FieldValue {
/* empty */
}
public static class BooleanValue {
boolean foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue boolean value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class ByteValue {
byte foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue byte value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class ShortValue {
short foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue short value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class CharacterValue {
char foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue char value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class IntegerValue {
int foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue int value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class LongValue {
long foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue long value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class FloatValue {
float foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue float value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class DoubleValue {
double foo;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue double value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
public static class ReferenceValue {
String foo = FOO;
public Object foo() {
return null;
}
@Advice.OnMethodExit
static void exit(@FieldValue String value, @Advice.Return(readOnly = false) Object returned) {
returned = value;
}
}
}