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Java example source code file (DefaultEdgeCreator.java)

This example Java source code file (DefaultEdgeCreator.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

binding, collection, defaultbindingtargetvisitor, defaultedgecreator, dependency, dependencyedge, edgecreator, edgevisitor, hasdependencies, iterable, list, nodeid, override, util

The DefaultEdgeCreator.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.Lists;
import com.google.inject.Binding;
import com.google.inject.spi.ConstructorBinding;
import com.google.inject.spi.ConvertedConstantBinding;
import com.google.inject.spi.DefaultBindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InstanceBinding;
import com.google.inject.spi.LinkedKeyBinding;
import com.google.inject.spi.ProviderBinding;
import com.google.inject.spi.ProviderInstanceBinding;
import com.google.inject.spi.ProviderKeyBinding;
import java.util.Collection;
import java.util.List;

/**
 * Default edge creator.
 *
 * @author bojand@google.com (Bojan Djordjevic)
 */
final class DefaultEdgeCreator implements EdgeCreator {

  @Override public Iterable<Edge> getEdges(Iterable> bindings) {
    List<Edge> edges = Lists.newArrayList();
    EdgeVisitor visitor = new EdgeVisitor();
    for (Binding<?> binding : bindings) {
      edges.addAll(binding.acceptTargetVisitor(visitor));
    }
    return edges;
  }

  /**
   * {@link BindingTargetVisitor} that adds edges to the graph based on the visited {@link Binding}.
   */
  private static final class EdgeVisitor
      extends DefaultBindingTargetVisitor<Object, Collection {

    /**
     * Returns a dependency edge for each {@link Dependency} in the binding. These will be from the
     * given node ID to the {@link Dependency}'s {@link Key}.
     *
     * @param nodeId ID of the node that should be the tail of the dependency
     *     edges
     * @param binding {@link Binding} for the dependencies
     */
    private <T extends Binding Collection newDependencyEdges(
        NodeId nodeId, T binding) {
      ImmutableList.Builder<Edge> builder = ImmutableList.builder();
      for (Dependency<?> dependency : binding.getDependencies()) {
        NodeId to = NodeId.newTypeId(dependency.getKey());
        builder.add(new DependencyEdge(nodeId, to, dependency.getInjectionPoint()));
      }
      return builder.build();
    }

    /**
     * Visitor for {@link ConstructorBinding}s. These are for classes that Guice will instantiate to
     * satisfy injection requests.
     */
    @Override public Collection<Edge> visit(ConstructorBinding binding) {
      return newDependencyEdges(NodeId.newTypeId(binding.getKey()), binding);
    }

    /**
     * Visitor for {@link ConvertedConstantBinding}. The {@link Binding}'s {@link Key} will be of an
     * annotated primitive type, and the value of {@link ConvertedConstantBinding#getSourceKey()}
     * will be of a {@link String} with the same annotation.
     */
    @Override public Collection<Edge> visit(ConvertedConstantBinding binding) {
      return ImmutableList.<Edge>of(new BindingEdge(NodeId.newTypeId(binding.getKey()),
          NodeId.newTypeId(binding.getSourceKey()),
          BindingEdge.Type.CONVERTED_CONSTANT));
    }

    /**
     * Visitor for {@link InstanceBinding}. We then render any dependency edgess that the instance
     * may have, which come either from {@link InjectionPoint}s (method and field) on the instance,
     * or on {@link Dependency}s the instance declares through the {@link HasDependencies}
     * interface.
     */
    @Override public Collection<Edge> visit(InstanceBinding binding) {
      return new ImmutableList.Builder<Edge>()
          .add(new BindingEdge(NodeId.newTypeId(binding.getKey()),
              NodeId.newInstanceId(binding.getKey()),
              BindingEdge.Type.NORMAL))
          .addAll(newDependencyEdges(NodeId.newInstanceId(binding.getKey()), binding))
          .build();
    }

    /**
     * Visitor for {@link LinkedKeyBinding}. This is the standard {@link Binding} you get from
     * binding an interface class to an implementation class. We  draw a {@link BindingEdge} from
     * the interface node to the node of the implementing class.
     */
    @Override public Collection<Edge> visit(LinkedKeyBinding binding) {
      return ImmutableList.<Edge>of(new BindingEdge(NodeId.newTypeId(binding.getKey()),
          NodeId.newTypeId(binding.getLinkedKey()),
          BindingEdge.Type.NORMAL));
    }

    /**
     * Visitor for {@link ProviderBinding}. These {@link Binding}s arise from an
     * {@link InjectionPoint} for the {@link Provider} interface.
     */
    @Override public Collection<Edge> visit(ProviderBinding binding) {
      return ImmutableList.<Edge>of(new BindingEdge(NodeId.newTypeId(binding.getKey()),
          NodeId.newTypeId(binding.getProvidedKey()), BindingEdge.Type.PROVIDER));
    }

    /**
     * Same as {@link #visit(InstanceBinding)}, but the binding edge is
     * {@link BindingEdge.Type#PROVIDER}.
     */
    @Override public Collection<Edge> visit(ProviderInstanceBinding binding) {
      return new ImmutableList.Builder<Edge>()
          .add(new BindingEdge(NodeId.newTypeId(binding.getKey()),
              NodeId.newInstanceId(binding.getKey()), BindingEdge.Type.PROVIDER))
          .addAll(newDependencyEdges(NodeId.newInstanceId(binding.getKey()), binding))
          .build();
    }

    /**
     * Same as {@link #visit(LinkedKeyBinding)}, but the binding edge is
     * {@link BindingEdge.Type#PROVIDER}.
     */
    @Override public Collection<Edge> visit(ProviderKeyBinding binding) {
      return ImmutableList.<Edge>of(new BindingEdge(NodeId.newTypeId(binding.getKey()),
          NodeId.newTypeId(binding.getProviderKey()), BindingEdge.Type.PROVIDER));
    }

    @Override public Collection<Edge> visitOther(Binding binding) {
      return ImmutableList.of();
    }
  }
}

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