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Java example source code file (TransitiveDependencyVisitor.java)

This example Java source code file (TransitiveDependencyVisitor.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

collection, defaultbindingtargetvisitor, override, set, transitivedependencyvisitor, util

The TransitiveDependencyVisitor.java Java example source code

/**
 * Copyright (C) 2008 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.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.inject.Binding;
import com.google.inject.Key;
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.Set;

/**
 * {@link com.google.inject.spi.BindingTargetVisitor} that returns a
 * {@link Collection} of the {@link Key}s of each {@link Binding}'s
 * dependencies. Used by {@link InjectorGrapher} to walk the dependency graph
 * from a starting set of {@link Binding}s.
 *
 * @author phopkins@gmail.com (Pete Hopkins)
 */
public class TransitiveDependencyVisitor
    extends DefaultBindingTargetVisitor<Object, Collection> {

  private Collection<Key visitHasDependencies(HasDependencies hasDependencies) {
    Set<Key dependencies = Sets.newHashSet();
    
    for (Dependency<?> dependency : hasDependencies.getDependencies()) {
      dependencies.add(dependency.getKey());
    }

    return dependencies;
  }
  
  @Override public Collection<Key visit(ConstructorBinding binding) {
    return visitHasDependencies(binding);
  }

  @Override public Collection<Key visit(ConvertedConstantBinding binding) {
    return visitHasDependencies(binding);
  }

  @Override public Collection<Key visit(InstanceBinding binding) {
    return visitHasDependencies(binding);
  }

  @Override public Collection<Key visit(LinkedKeyBinding binding) {
    return ImmutableSet.<Keyof(binding.getLinkedKey());
  }

  @Override public Collection<Key visit(ProviderBinding binding) {
    return ImmutableSet.<Keyof(binding.getProvidedKey());
  }

  @Override public Collection<Key visit(ProviderInstanceBinding binding) {
    return visitHasDependencies(binding);
  }

  @Override public Collection<Key visit(ProviderKeyBinding binding) {
    return ImmutableSet.<Keyof(binding.getProviderKey());
  }

  /** @since 4.0 */
  @Override public Collection<Key visitOther(Binding binding) {
    return ImmutableSet.of();
  }
}

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