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Java example source code file (BoundInstanceInjectionTest.java)

This example Java source code file (BoundInstanceInjectionTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmodule, annotation, another, bindingannotation, boundinstanceinjectiontest, creationexception, inject, injector, malformedinjectable, malformedprovider, method, parameter, retention, string

The BoundInstanceInjectionTest.java Java example source code

/**
 * 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 java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import com.google.inject.name.Named;

import junit.framework.TestCase;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class BoundInstanceInjectionTest extends TestCase {

  public void testInstancesAreInjected() throws CreationException {
    final O o = new O();

    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(O.class).toInstance(o);
        bind(int.class).toInstance(5);
      }
    });

    assertEquals(5, o.fromMethod);
  }

  static class O {
    int fromMethod;
    @Inject
    void setInt(int i) {
      this.fromMethod = i;
    }
  }

  public void testProvidersAreInjected() throws CreationException {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(O.class).toProvider(new Provider<O>() {
          @Inject int i;
          public O get() {
            O o = new O();
            o.setInt(i);
            return o;
          }
        });
        bind(int.class).toInstance(5);
      }
    });

    assertEquals(5, injector.getInstance(O.class).fromMethod);
  }

  public void testMalformedInstance() {
    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          bind(Object.class).toInstance(new MalformedInjectable());
        }
      });
      fail();
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(), MalformedInjectable.class.getName(),
          ".doublyAnnotated() has more than one ", "annotation annotated with @BindingAnnotation: ",
          Named.class.getName() + " and " + Another.class.getName());
    }
  }

  public void testMalformedProvider() {
    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          bind(String.class).toProvider(new MalformedProvider());
        }
      });
      fail();
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(), MalformedProvider.class.getName(),
          ".doublyAnnotated() has more than one ", "annotation annotated with @BindingAnnotation: ",
          Named.class.getName() + " and " + Another.class.getName());
    }
  }

  static class MalformedInjectable {
    @Inject void doublyAnnotated(@Named("a") @Another String unused) {}
  }

  static class MalformedProvider implements Provider<String> {
    @Inject void doublyAnnotated(@Named("a") @Another String s) {}

    public String get() {
      return "a";
    }
  }

  @BindingAnnotation @Target({ FIELD, PARAMETER, METHOD }) @Retention(RUNTIME)
  public @interface Another {}
}

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