MethodDelegationDefaultTest.java

package net.bytebuddy.implementation;

import net.bytebuddy.ByteBuddy;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import net.bytebuddy.implementation.bind.annotation.Default;
import net.bytebuddy.test.utility.JavaVersionRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.MethodRule;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;

public class MethodDelegationDefaultTest {

    private static final String FOO = "foo", BAR = "bar";

    private static final String DEFAULT_INTERFACE = "net.bytebuddy.test.precompiled.DelegationDefaultInterface";

    private static final String DELEGATION_TARGET = "net.bytebuddy.test.precompiled.DelegationDefaultTarget";

    private static final String DELEGATION_TARGET_SERIALIZABLE = "net.bytebuddy.test.precompiled.DelegationDefaultTargetSerializable";

    private static final String DELEGATION_TARGET_EXPLICIT = "net.bytebuddy.test.precompiled.DelegationDefaultTargetExplicit";

    @Rule
    public MethodRule javaVersionRule = new JavaVersionRule();

    @Test
    @JavaVersionRule.Enforce(8)
    public void testDefaultInterface() throws Exception {
        DynamicType.Loaded<?> loaded = new ByteBuddy()
                .subclass(Object.class)
                .implement(Class.forName(DEFAULT_INTERFACE))
                .intercept(MethodDelegation.to(Class.forName(DELEGATION_TARGET)))
                .make()
                .load(Class.forName(DEFAULT_INTERFACE).getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
        Object instance = loaded.getLoaded().getDeclaredConstructor().newInstance();
        assertThat(instance.getClass().getDeclaredMethod(FOO).invoke(instance), is((Object) (FOO + BAR)));
    }

    @Test(expected = AbstractMethodError.class)
    @JavaVersionRule.Enforce(8)
    public void testNoDefaultInterface() throws Exception {
        DynamicType.Loaded<?> loaded = new ByteBuddy()
                .subclass(Object.class)
                .implement(DelegationNoDefaultInterface.class)
                .intercept(MethodDelegation.to(DelegationNoDefaultInterfaceInterceptor.class))
                .make()
                .load(DelegationNoDefaultInterface.class.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
        DelegationNoDefaultInterface instance = (DelegationNoDefaultInterface) loaded.getLoaded().getDeclaredConstructor().newInstance();
        instance.foo();
    }

    @Test
    @JavaVersionRule.Enforce(8)
    public void testDefaultInterfaceSerializableProxy() throws Exception {
        DynamicType.Loaded<?> loaded = new ByteBuddy()
                .subclass(Object.class)
                .implement(Class.forName(DEFAULT_INTERFACE))
                .intercept(MethodDelegation.to(Class.forName(DELEGATION_TARGET_SERIALIZABLE)))
                .make()
                .load(Class.forName(DEFAULT_INTERFACE).getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
        Object instance = loaded.getLoaded().getDeclaredConstructor().newInstance();
        assertThat(instance.getClass().getDeclaredMethod(FOO).invoke(instance), is((Object) (FOO + BAR)));
    }

    @Test
    @JavaVersionRule.Enforce(8)
    public void testDefaultInterfaceExplicitProxyType() throws Exception {
        DynamicType.Loaded<?> loaded = new ByteBuddy()
                .subclass(Object.class)
                .implement(Class.forName(DEFAULT_INTERFACE))
                .intercept(MethodDelegation.to(Class.forName(DELEGATION_TARGET_EXPLICIT)))
                .make()
                .load(Class.forName(DEFAULT_INTERFACE).getClassLoader(), ClassLoadingStrategy.Default.WRAPPER);
        Object instance = loaded.getLoaded().getDeclaredConstructor().newInstance();
        assertThat(instance.getClass().getDeclaredMethod(FOO).invoke(instance), is((Object) (FOO + BAR)));
    }

    public interface DelegationNoDefaultInterface {

        String foo();
    }

    public static class DelegationNoDefaultInterfaceInterceptor {

        public static String intercept(@Default DelegationNoDefaultInterface proxy) {
            return proxy.foo();
        }
    }
}