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Java example source code file (NamedEquivalanceTest.java)

This example Java source code file (NamedEquivalanceTest.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, guice_binding_module, guice_provider_method_module, guicenamed, inject, jsr330_binding_module, jsr330_provider_method_module, jsr330namedclient, jsrnamed, module, override, provides, string, suppresswarnings, util

The NamedEquivalanceTest.java Java example source code

/**
 * Copyright (C) 2010 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.name;

import static com.google.inject.Asserts.assertContains;

import com.google.inject.AbstractModule;
import com.google.inject.ConfigurationException;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provides;

import junit.framework.TestCase;

import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.util.Properties;

/**
 * Tests that {@code javax.inject.Named} and {@code com.google.inject.name.Named} are completely
 * interchangeable: bindings for one can be used to inject the other.
 * 
 * @author cgdecker@gmail.com (Colin Decker)
 */
public class NamedEquivalanceTest extends TestCase {

  private static final Module GUICE_BINDING_MODULE = moduleWithAnnotation(Names.named("foo"));
  private static final Module JSR330_BINDING_MODULE = moduleWithAnnotation(new JsrNamed("foo"));
  private static final Module GUICE_PROVIDER_METHOD_MODULE = getGuiceBindingProviderMethodModule();
  private static final Module JSR330_PROVIDER_METHOD_MODULE = getJsr330BindingProviderMethodModule();

  public void testKeysCreatedWithDifferentTypesAreEqual() {
    assertEquals(keyForAnnotation(new GuiceNamed("foo")), keyForAnnotation(new JsrNamed("foo")));
    assertEquals(keyForAnnotation(Names.named("foo")), keyForAnnotation(new GuiceNamed("foo")));
    assertEquals(keyForAnnotation(Names.named("foo")), keyForAnnotation(new JsrNamed("foo")));

    assertEquals(keyForAnnotationType(com.google.inject.name.Named.class),
        keyForAnnotationType(javax.inject.Named.class));
  }

  private static Key<String> keyForAnnotation(Annotation annotation) {
    return Key.get(String.class, annotation);
  }
  
  private static Key<String> keyForAnnotationType(Class annotationType) {
    return Key.get(String.class, annotationType);
  }

  public void testBindingWithNamesCanInjectBothTypes() {
    assertInjectionsSucceed(GUICE_BINDING_MODULE);
  }

  public void testBindingWithJsr330AnnotationCanInjectBothTypes() {
    assertInjectionsSucceed(JSR330_BINDING_MODULE);
  }

  public void testBindingWithGuiceNamedAnnotatedProviderMethodCanInjectBothTypes() {
    assertInjectionsSucceed(GUICE_PROVIDER_METHOD_MODULE);
  }

  public void testBindingWithJsr330NamedAnnotatedProviderMethodCanInjectBothTypes() {
    assertInjectionsSucceed(JSR330_PROVIDER_METHOD_MODULE);
  }

  public void testBindingDifferentTypesWithSameValueIsIgnored() {
    assertDuplicateBinding(GUICE_BINDING_MODULE, JSR330_BINDING_MODULE, false);
    assertDuplicateBinding(JSR330_BINDING_MODULE, GUICE_BINDING_MODULE, false);
  }

  public void testBindingDifferentTypesWithSameValueIsAnErrorWithProviderMethods() {
    assertDuplicateBinding(GUICE_PROVIDER_METHOD_MODULE, JSR330_PROVIDER_METHOD_MODULE, true);
    assertDuplicateBinding(JSR330_PROVIDER_METHOD_MODULE, GUICE_PROVIDER_METHOD_MODULE, true);
  }

  public void testBindingDifferentTypesWithSameValueIsAnErrorMixed() {
    assertDuplicateBinding(GUICE_BINDING_MODULE, JSR330_PROVIDER_METHOD_MODULE, true);
    assertDuplicateBinding(JSR330_BINDING_MODULE, GUICE_PROVIDER_METHOD_MODULE, true);
  }

  public void testMissingBindingForGuiceNamedUsesSameTypeInErrorMessage() {
    assertMissingBindingErrorMessageUsesType(GuiceNamedClient.class);
  }

  public void testMissingBindingForJsr330NamedUsesSameTypeInErrorMessage() {
    assertMissingBindingErrorMessageUsesType(Jsr330NamedClient.class);
  }

  public void testBindPropertiesWorksWithJsr330() {
    assertInjectionsSucceed(new AbstractModule() {
      @Override protected void configure() {
        Properties properties = new Properties();
        properties.put("foo", "bar");
        Names.bindProperties(binder(), properties);
      }
    });
  }

  private static void assertMissingBindingErrorMessageUsesType(Class<?> clientType) {
    try {
      Guice.createInjector().getInstance(clientType);
      fail("should have thrown ConfigurationException");
    } catch (ConfigurationException e) {
      assertContains(e.getMessage(),
          "No implementation for java.lang.String annotated with @com.google.inject.name.Named(value=foo) was bound.");
    }
  }

  private static void assertDuplicateBinding(Module a, Module b, boolean fails) {
    try {
      Guice.createInjector(a, b);
      if(fails) {
        fail("should have thrown CreationException");
      }
    } catch (CreationException e) {
      if(fails) {
        assertContains(e.getMessage(),
            "A binding to java.lang.String annotated with @com.google.inject.name.Named(value=foo) was already configured");
      } else {
        throw e;
      }
    }
  }

  private static Module moduleWithAnnotation(final Annotation annotation) {
    return new AbstractModule() {
      @Override protected void configure() {
        bindConstant().annotatedWith(annotation).to("bar");
      }
    };
  }

  private static void assertInjectionsSucceed(Module module) {
    Injector injector = Guice.createInjector(module);
    assertInjected(injector.getInstance(GuiceNamedClient.class), injector
        .getInstance(Jsr330NamedClient.class));
  }

  private static void assertInjected(GuiceNamedClient guiceClient, Jsr330NamedClient jsr330Client) {
    assertEquals("bar", guiceClient.foo);
    assertEquals("bar", jsr330Client.foo);
  }

  private static Module getJsr330BindingProviderMethodModule() {
    return new AbstractModule() {
      @Override protected void configure() {}
      @SuppressWarnings("unused") @Provides @javax.inject.Named("foo") String provideFoo() {
        return "bar";
      }
    };
  }

  private static Module getGuiceBindingProviderMethodModule() {
    return new AbstractModule() {
      @Override protected void configure() {}
      @SuppressWarnings("unused") @Provides @Named("foo") String provideFoo() {
        return "bar";
      }
    };
  }

  private static class GuiceNamedClient {
    @Inject @Named("foo") String foo;
  }

  private static class Jsr330NamedClient {
    @Inject @javax.inject.Named("foo") String foo;
  }

  private static class JsrNamed implements javax.inject.Named, Serializable {
    private final String value;

    public JsrNamed(String value) {
      this.value = value;
    }

    public String value() {
      return this.value;
    }

    public int hashCode() {
      // This is specified in java.lang.Annotation.
      return (127 * "value".hashCode()) ^ value.hashCode();
    }

    public boolean equals(Object o) {
      if (!(o instanceof javax.inject.Named)) {
        return false;
      }

      javax.inject.Named other = (javax.inject.Named) o;
      return value.equals(other.value());
    }

    public String toString() {
      return "@" + javax.inject.Named.class.getName() + "(value=" + value + ")";
    }

    public Class<? extends Annotation> annotationType() {
      return javax.inject.Named.class;
    }

    private static final long serialVersionUID = 0;
  }

  private static class GuiceNamed implements com.google.inject.name.Named, Serializable {
    private final String value;
    
    public GuiceNamed(String value) {
      this.value = value;
    }
    
    public String value() {
      return this.value;
    }
    
    public int hashCode() {
      // This is specified in java.lang.Annotation.
      return (127 * "value".hashCode()) ^ value.hashCode();
    }

    public boolean equals(Object o) {
      if (!(o instanceof com.google.inject.name.Named)) {
        return false;
      }

      com.google.inject.name.Named other = (com.google.inject.name.Named) o;
      return value.equals(other.value());
    }

    public String toString() {
      return "@" + com.google.inject.name.Named.class.getName() + "(value=" + value + ")";
    }

    public Class<? extends Annotation> annotationType() {
      return com.google.inject.name.Named.class;
    }

    private static final long serialVersionUID = 0;
  }
}

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