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Java example source code file (AbstractInjectorGrapherTest.java)

This example Java source code file (AbstractInjectorGrapherTest.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

abstractinjectorgraphertest, abstractmodule, annotation, bindingannotation, exception, fakegrapher, inject, node, override, reflection, set, test_string, testcase, util, wrapper

The AbstractInjectorGrapherTest.java Java example source code

/**
 * Copyright (C) 2011 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.grapher;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.inject.AbstractModule;
import com.google.inject.BindingAnnotation;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.spi.InjectionPoint;

import junit.framework.TestCase;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Member;
import java.util.Set;

/**
 * Test cases for {@link AbstractInjectorGrapher}. This indirectly tests most classes in this
 * package.
 *
 * @author bojand@google.com (Bojan Djordjevic)
 */

public class AbstractInjectorGrapherTest extends TestCase {
  private static final String TEST_STRING = "test";

  private static class FakeGrapher extends AbstractInjectorGrapher {
    final Set<Node> nodes = Sets.newHashSet();
    final Set<Edge> edges = Sets.newHashSet();

    @Override protected void reset() {
      nodes.clear();
      edges.clear();
    }

    @Override protected void newInterfaceNode(InterfaceNode node) {
      assertFalse(nodes.contains(node));
      nodes.add(node);
    }

    @Override protected void newImplementationNode(ImplementationNode node) {
      assertFalse(nodes.contains(node));
      nodes.add(node);
    }

    @Override protected void newInstanceNode(InstanceNode node) {
      assertFalse(nodes.contains(node));
      nodes.add(node);
    }

    @Override protected void newDependencyEdge(DependencyEdge edge) {
      assertFalse(edges.contains(edge));
      edges.add(edge);
    }

    @Override protected void newBindingEdge(BindingEdge edge) {
      assertFalse(edges.contains(edge));
      edges.add(edge);
    }

    @Override protected void postProcess() {}
  }

  private static final class Wrapper<T> {
    T value;
  }

  @BindingAnnotation
  @Retention(RetentionPolicy.RUNTIME)
  private static @interface Ann {}
  private static interface IA {}
  private static class A implements IA {
    @Inject public A(String str) {}
  }
  private static class A2 implements IA {
    @Inject public A2(Provider<String> strProvider) {}
  }

  private Node aNode;
  private Node a2Node;
  private Node iaNode;
  private Node iaAnnNode;
  private Node stringNode;
  private Node stringInstanceNode;

  private FakeGrapher grapher;

  @Override protected void setUp() throws Exception {
    super.setUp();
    grapher = new FakeGrapher();
    Node.ignoreSourceInComparisons = true;
    aNode = new ImplementationNode(NodeId.newTypeId(Key.get(A.class)), null,
        ImmutableList.<Member>of(A.class.getConstructor(String.class)));
    a2Node = new ImplementationNode(NodeId.newTypeId(Key.get(A2.class)), null,
        ImmutableList.<Member>of(A2.class.getConstructor(Provider.class)));
    iaNode = new InterfaceNode(NodeId.newTypeId(Key.get(IA.class)), null);
    iaAnnNode = new InterfaceNode(NodeId.newTypeId(Key.get(IA.class, Ann.class)), null);
    stringNode = new InterfaceNode(NodeId.newTypeId(Key.get(String.class)), null);
    stringInstanceNode = new InstanceNode(NodeId.newInstanceId(Key.get(String.class)), null,
        TEST_STRING, ImmutableList.<Member>of());
  }

  public void testLinkedAndInstanceBindings() throws Exception {
    grapher.graph(Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(IA.class).to(A.class);
          bind(IA.class).annotatedWith(Ann.class).to(A.class);
          bind(String.class).toInstance(TEST_STRING);
        }
    }));

    Set<Node> expectedNodes =
        ImmutableSet.<Node>of(iaNode, iaAnnNode, aNode, stringNode, stringInstanceNode);
    Set<Edge> expectedEdges = ImmutableSet.of(
        new BindingEdge(iaNode.getId(), aNode.getId(), BindingEdge.Type.NORMAL),
        new BindingEdge(iaAnnNode.getId(), aNode.getId(), BindingEdge.Type.NORMAL),
        new BindingEdge(stringNode.getId(), stringInstanceNode.getId(), BindingEdge.Type.NORMAL),
        new DependencyEdge(aNode.getId(), stringNode.getId(),
            InjectionPoint.forConstructor(A.class.getConstructor(String.class))));
    assertEquals(expectedNodes, grapher.nodes);
    assertEquals(expectedEdges, grapher.edges);
  }

  public void testProviderBindings() throws Exception {
    final Wrapper<Provider wrapper = new Wrapper>();
    grapher.graph(Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          wrapper.value = getProvider(A2.class);
          bind(IA.class).toProvider(wrapper.value);
          bind(A2.class);
          bind(String.class).toInstance(TEST_STRING);
        }
    }));

    Node a2ProviderNode = new InstanceNode(NodeId.newInstanceId(Key.get(IA.class)), null,
        wrapper.value, ImmutableList.<Member>of());
    Set<Node> expectedNodes =
        ImmutableSet.<Node>of(iaNode, stringNode, a2Node, stringInstanceNode, a2ProviderNode);
    Set<Edge> expectedEdges = ImmutableSet.of(
        new BindingEdge(stringNode.getId(), stringInstanceNode.getId(), BindingEdge.Type.NORMAL),
        new BindingEdge(iaNode.getId(), a2ProviderNode.getId(), BindingEdge.Type.PROVIDER),
        new DependencyEdge(a2Node.getId(), stringNode.getId(),
            InjectionPoint.forConstructor(A2.class.getConstructor(Provider.class))),
        new DependencyEdge(a2ProviderNode.getId(), a2Node.getId(), null));
    assertEquals("wrong nodes", expectedNodes, grapher.nodes);
    assertEquals("wrong edges", expectedEdges, grapher.edges);
  }

  public void testGraphWithGivenRoot() throws Exception {
    grapher.graph(Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(IA.class).to(A.class);
          bind(IA.class).annotatedWith(Ann.class).to(A.class);
          bind(String.class).toInstance(TEST_STRING);
        }
    }), ImmutableSet.<Keyof(Key.get(String.class)));

    Set<Node> expectedNodes = ImmutableSet.of(stringNode, stringInstanceNode);
    Set<Edge> expectedEdges = ImmutableSet.of(
        new BindingEdge(stringNode.getId(), stringInstanceNode.getId(), BindingEdge.Type.NORMAL));
    assertEquals(expectedNodes, grapher.nodes);
    assertEquals(expectedEdges, grapher.edges);
  }
}

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