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Java example source code file (ProvidesIntoTest.java)

This example Java source code file (ProvidesIntoTest.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, arraywrappedkey, creationexception, key, mapkey, named, number, object, override, providesintomap, providesintoset, reflection, retention, string, suppresswarnings, util

The ProvidesIntoTest.java Java example source code

/**
 * Copyright (C) 2015 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.multibindings;

import static com.google.inject.Asserts.assertContains;
import static com.google.inject.name.Names.named;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.inject.AbstractModule;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.multibindings.ProvidesIntoOptional.Type;
import com.google.inject.name.Named;

import junit.framework.TestCase;

import java.lang.annotation.Retention;
import java.lang.reflect.Field;
import java.util.Map;
import java.util.Set;

/**
 * Tests the various @ProvidesInto annotations.
 *
 * @author sameb@google.com (Sam Berlin)
 */
public class ProvidesIntoTest extends TestCase {

  public void testAnnotation() throws Exception {
    Injector injector = Guice.createInjector(MultibindingsScanner.asModule(), new AbstractModule() {
      @Override protected void configure() {}

      @ProvidesIntoSet
      @Named("foo")
      String setFoo() { return "foo"; }

      @ProvidesIntoSet
      @Named("foo")
      String setFoo2() { return "foo2"; }

      @ProvidesIntoSet
      @Named("bar")
      String setBar() { return "bar"; }

      @ProvidesIntoSet
      @Named("bar")
      String setBar2() { return "bar2"; }

      @ProvidesIntoSet
      String setNoAnnotation() { return "na"; }

      @ProvidesIntoSet
      String setNoAnnotation2() { return "na2"; }

      @ProvidesIntoMap
      @StringMapKey("fooKey")
      @Named("foo")
      String mapFoo() { return "foo"; }

      @ProvidesIntoMap
      @StringMapKey("foo2Key")
      @Named("foo")
      String mapFoo2() { return "foo2"; }

      @ProvidesIntoMap
      @ClassMapKey(String.class)
      @Named("bar")
      String mapBar() { return "bar"; }

      @ProvidesIntoMap
      @ClassMapKey(Number.class)
      @Named("bar")
      String mapBar2() { return "bar2"; }

      @ProvidesIntoMap
      @TestEnumKey(TestEnum.A)
      String mapNoAnnotation() { return "na"; }

      @ProvidesIntoMap
      @TestEnumKey(TestEnum.B)
      String mapNoAnnotation2() { return "na2"; }

      @ProvidesIntoMap
      @WrappedKey(number = 1)
      Number wrapped1() { return 11; }

      @ProvidesIntoMap
      @WrappedKey(number = 2)
      Number wrapped2() { return 22; }

      @ProvidesIntoOptional(ProvidesIntoOptional.Type.DEFAULT)
      @Named("foo")
      String optionalDefaultFoo() { return "foo"; }

      @ProvidesIntoOptional(ProvidesIntoOptional.Type.ACTUAL)
      @Named("foo")
      String optionalActualFoo() { return "foo2"; }

      @ProvidesIntoOptional(ProvidesIntoOptional.Type.DEFAULT)
      @Named("bar")
      String optionalDefaultBar() { return "bar"; }

      @ProvidesIntoOptional(ProvidesIntoOptional.Type.ACTUAL)
      String optionalActualBar() { return "na2"; }
    });

    Set<String> fooSet = injector.getInstance(new Key>(named("foo")) {});
    assertEquals(ImmutableSet.of("foo", "foo2"), fooSet);

    Set<String> barSet = injector.getInstance(new Key>(named("bar")) {});
    assertEquals(ImmutableSet.of("bar", "bar2"), barSet);

    Set<String> noAnnotationSet = injector.getInstance(new Key>() {});
    assertEquals(ImmutableSet.of("na", "na2"), noAnnotationSet);

    Map<String, String> fooMap =
        injector.getInstance(new Key<Map(named("foo")) {});
    assertEquals(ImmutableMap.of("fooKey", "foo", "foo2Key", "foo2"), fooMap);

    Map<Class barMap =
        injector.getInstance(new Key<Map>(named("bar")) {});
    assertEquals(ImmutableMap.of(String.class, "bar", Number.class, "bar2"), barMap);

    Map<TestEnum, String> noAnnotationMap =
        injector.getInstance(new Key<Map() {});
    assertEquals(ImmutableMap.of(TestEnum.A, "na", TestEnum.B, "na2"), noAnnotationMap);

    Map<WrappedKey, Number> wrappedMap =
        injector.getInstance(new Key<Map() {});
    assertEquals(ImmutableMap.of(wrappedKeyFor(1), 11, wrappedKeyFor(2), 22), wrappedMap);

    Optional<String> fooOptional =
        injector.getInstance(new Key<Optional(named("foo")) {});
    assertEquals("foo2", fooOptional.get());

    Optional<String> barOptional =
        injector.getInstance(new Key<Optional(named("bar")) {});
    assertEquals("bar", barOptional.get());

    Optional<String> noAnnotationOptional =
        injector.getInstance(new Key<Optional() {});
    assertEquals("na2", noAnnotationOptional.get());
  }

  enum TestEnum {
    A, B
  }

  @MapKey(unwrapValue = true)
  @Retention(RUNTIME)
  @interface TestEnumKey {
    TestEnum value();
  }

  @MapKey(unwrapValue = false)
  @Retention(RUNTIME)
  @interface WrappedKey {
    int number();
  }
  
  @SuppressWarnings("unused") @WrappedKey(number=1) private static Object wrappedKey1Holder;
  @SuppressWarnings("unused") @WrappedKey(number=2) private static Object wrappedKey2Holder;
  WrappedKey wrappedKeyFor(int number) throws Exception {
    Field field;
    switch (number) {
      case 1:
        field = ProvidesIntoTest.class.getDeclaredField("wrappedKey1Holder");
        break;
      case 2:
        field = ProvidesIntoTest.class.getDeclaredField("wrappedKey2Holder");
        break;
      default:
        throw new IllegalArgumentException("only 1 or 2 supported");
    }
    return field.getAnnotation(WrappedKey.class);
  }
  
  public void testDoubleScannerIsIgnored() {
    Injector injector = Guice.createInjector(
        MultibindingsScanner.asModule(),
        MultibindingsScanner.asModule(),
        new AbstractModule() {
          @Override protected void configure() {}
          @ProvidesIntoSet String provideFoo() { return "foo"; }
        }
    );
    assertEquals(ImmutableSet.of("foo"), injector.getInstance(new Key<Set() {}));
  }
  
  @MapKey(unwrapValue = true)
  @Retention(RUNTIME)
  @interface ArrayUnwrappedKey {
    int[] value();
  }
  
  public void testArrayKeys_unwrapValuesTrue() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}
      @ProvidesIntoMap @ArrayUnwrappedKey({1, 2}) String provideFoo() { return "foo"; }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(),
          "Array types are not allowed in a MapKey with unwrapValue=true: "
              + ArrayUnwrappedKey.class.getName(),
          "at " + m.getClass().getName() + ".provideFoo(");
    }    
  }

  @MapKey(unwrapValue = false)
  @Retention(RUNTIME)
  @interface ArrayWrappedKey {
    int[] number();
  }
  
  @SuppressWarnings("unused") @ArrayWrappedKey(number={1, 2}) private static Object arrayWrappedKeyHolder12;
  @SuppressWarnings("unused") @ArrayWrappedKey(number={3, 4}) private static Object arrayWrappedKeyHolder34;
  ArrayWrappedKey arrayWrappedKeyFor(int number) throws Exception {
    Field field;
    switch (number) {
      case 12:
        field = ProvidesIntoTest.class.getDeclaredField("arrayWrappedKeyHolder12");
        break;
      case 34:
        field = ProvidesIntoTest.class.getDeclaredField("arrayWrappedKeyHolder34");
        break;
      default:
        throw new IllegalArgumentException("only 1 or 2 supported");
    }
    return field.getAnnotation(ArrayWrappedKey.class);
  }
  
  public void testArrayKeys_unwrapValuesFalse() throws Exception {
    Module m = new AbstractModule() {
      @Override protected void configure() {}
      @ProvidesIntoMap @ArrayWrappedKey(number = {1, 2}) String provideFoo() { return "foo"; }
      @ProvidesIntoMap @ArrayWrappedKey(number = {3, 4}) String provideBar() { return "bar"; }
    };
    Injector injector = Guice.createInjector(MultibindingsScanner.asModule(), m);
    Map<ArrayWrappedKey, String> map =
        injector.getInstance(new Key<Map() {});
    ArrayWrappedKey key12 = arrayWrappedKeyFor(12);
    ArrayWrappedKey key34 = arrayWrappedKeyFor(34);
    assertEquals("foo", map.get(key12));
    assertEquals("bar", map.get(key34));
    assertEquals(2, map.size());
  }
  
  public void testProvidesIntoSetWithMapKey() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}
      @ProvidesIntoSet @TestEnumKey(TestEnum.A) String provideFoo() { return "foo"; }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(), "Found a MapKey annotation on non map binding at "
          + m.getClass().getName() + ".provideFoo");
    }
  }
  
  public void testProvidesIntoOptionalWithMapKey() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}

      @ProvidesIntoOptional(Type.ACTUAL)
      @TestEnumKey(TestEnum.A)
      String provideFoo() {
        return "foo";
      }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(), "Found a MapKey annotation on non map binding at "
          + m.getClass().getName() + ".provideFoo");
    }
  }
  
  public void testProvidesIntoMapWithoutMapKey() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}
      @ProvidesIntoMap String provideFoo() { return "foo"; }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(), "No MapKey found for map binding at "
          + m.getClass().getName() + ".provideFoo");
    }
  }
  
  @MapKey(unwrapValue = true)
  @Retention(RUNTIME)
  @interface TestEnumKey2 {
    TestEnum value();
  }
  
  public void testMoreThanOneMapKeyAnnotation() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}

      @ProvidesIntoMap
      @TestEnumKey(TestEnum.A)
      @TestEnumKey2(TestEnum.B)
      String provideFoo() {
        return "foo";
      }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(), "Found more than one MapKey annotations on "
          + m.getClass().getName() + ".provideFoo");
    }    
  }
  
  @MapKey(unwrapValue = true)
  @Retention(RUNTIME)
  @interface MissingValueMethod {
  }
  
  public void testMapKeyMissingValueMethod() {
    Module m = new AbstractModule() {
      @Override protected void configure() {}

      @ProvidesIntoMap
      @MissingValueMethod
      String provideFoo() {
        return "foo";
      }
    };
    try {
      Guice.createInjector(MultibindingsScanner.asModule(), m);
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(), "No 'value' method in MapKey with unwrapValue=true: "
          + MissingValueMethod.class.getName());
    }    
  }
}

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