InjectionPointInjectTest.java

/**
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.guiceyfruit.experiments;

import com.google.inject.AbstractModule;
import com.google.inject.BindingAnnotation;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Provider;
import com.google.inject.internal.Preconditions;
import com.google.inject.spi.InjectionPoint;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Member;
import junit.framework.TestCase;

/** @version $Revision: 1.1 $ */
public class InjectionPointInjectTest extends TestCase {

  public void testInjectionPointInjection() throws Exception {
    Injector injector = Guice.createInjector(new AbstractModule() {

      protected void configure() {
        bind(String.class).annotatedWith(Property.class).toProvider(MyProvider.class);
      }
    });

    MyBean bean = injector.getInstance(MyBean.class);
    assertNotNull("Bean was null!", bean);

    assertEquals("bean.name", "hello foo", bean.name);
  }

  @Retention(RUNTIME)
  @BindingAnnotation
  public static @interface Property {
      String value();
  }

  public static class MyBean {
    @Inject
    @Property("foo")
    String name;
  }

  public static class MyProvider implements Provider<String> {
    @Inject
    InjectionPoint injectionPoint;

    public String get() {
      Preconditions.checkNotNull(injectionPoint, "injectionPoint not injected!");

      Member member = injectionPoint.getMember();
      if (member instanceof AnnotatedElement) {
        AnnotatedElement annotatedElement = (AnnotatedElement) member;
        Property property = annotatedElement.getAnnotation(Property.class);
        if (property != null) {
          String value = property.value();
          return "hello " + value;
        }
      }
      return null;
    }
  }
}