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Java example source code file (DefaultNodeCreator.java)

This example Java source code file (DefaultNodeCreator.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, defaultnodecreator, dependency, hasdependencies, implementationnode, injectionpoint, interfacenode, iterable, list, nodecreator, nodevisitor, object, override, reflection, util

The DefaultNodeCreator.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.DefaultBindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.InstanceBinding;
import com.google.inject.spi.ProviderInstanceBinding;

import java.lang.reflect.Member;
import java.util.Collection;
import java.util.List;

/**
 * Default node creator.
 *
 * @author bojand@google.com (Bojan Djordjevic)
 */
final class DefaultNodeCreator implements NodeCreator {
  @Override public Iterable<Node> getNodes(Iterable> bindings) {
    List<Node> nodes = Lists.newArrayList();
    NodeVisitor visitor = new NodeVisitor();
    for (Binding<?> binding : bindings) {
      nodes.addAll(binding.acceptTargetVisitor(visitor));
    }
    return nodes;
  }

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

    /** Returns a new interface node for the given {@link Binding}. */
    private InterfaceNode newInterfaceNode(Binding<?> binding) {
      return new InterfaceNode(NodeId.newTypeId(binding.getKey()), binding.getSource());
    }

    /**
     * Returns a new implementation node for the given binding.
     *
     * @param binding binding for the node to create
     * @param members members to add to the node
     * @return implementation node for the given binding
     */
    private ImplementationNode newImplementationNode(Binding<?> binding,
        Collection<Member> members) {
      return new ImplementationNode(NodeId.newTypeId(binding.getKey()), binding.getSource(),
          members);
    }

    /**
     * Returns a new instance node for the given {@link Binding}.
     *
     * @param binding binding for the node to create
     * @param instance value of the instance
     * @return instance node for the given binding
     */
    private <T extends Binding InstanceNode newInstanceNode(T binding,
        Object instance) {
      Collection<Member> members = Lists.newArrayList();
      for (Dependency<?> dependency : binding.getDependencies()) {
        InjectionPoint injectionPoint = dependency.getInjectionPoint();

        if (injectionPoint != null) {
          members.add(injectionPoint.getMember());
        }
      }
      return new InstanceNode(NodeId.newInstanceId(binding.getKey()), binding.getSource(), instance,
          members);
    }

    /**
     * Visitor for {@link ConstructorBinding}s. These are for classes that Guice will instantiate to
     * satisfy injection requests.
     */
    @Override public Collection<Node> visit(ConstructorBinding binding) {
      Collection<Member> members = Lists.newArrayList();
      members.add(binding.getConstructor().getMember());
      for (InjectionPoint injectionPoint : binding.getInjectableMembers()) {
        members.add(injectionPoint.getMember());
      }

      return ImmutableList.<Node>of(newImplementationNode(binding, members));
    }

    /**
     * Visitor for {@link InstanceBinding}. We render two nodes in this case: an interface node for
     * the binding's {@link Key}, and then an implementation node for the instance {@link Object}
     * itself.
     */
    @Override public Collection<Node> visit(InstanceBinding binding) {
      return ImmutableList.<Node>of(newInterfaceNode(binding), newInstanceNode(binding,
          binding.getInstance()));
    }

    /**
     * Same as {@link #visit(InstanceBinding)}, but the binding edge is
     * {@link BindingEdgeType#PROVIDER}.
     */
    @Override public Collection<Node> visit(ProviderInstanceBinding binding) {
      return ImmutableList.<Node>of(newInterfaceNode(binding), newInstanceNode(binding,
          binding.getUserSuppliedProvider()));
    }

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

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