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Java example source code file (BindingCollector.java)

This example Java source code file (BindingCollector.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

bindingcollector, map, message, only, override, typeliteral, util

The BindingCollector.java Java example source code

 * Copyright (C) 2009 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.google.inject.assistedinject;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.inject.ConfigurationException;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.Message;

import java.util.Collections;
import java.util.Map;

 * Utility class for collecting factory bindings. Used for configuring {@link FactoryProvider2}.
 * @author schmitt@google.com (Peter Schmitt)
class BindingCollector {

  private final Map<Key> bindings = Maps.newHashMap();

  public BindingCollector addBinding(Key<?> key, TypeLiteral target) {
    if (bindings.containsKey(key)) {
      throw new ConfigurationException(ImmutableSet.of(
          new Message("Only one implementation can be specified for " + key)));

    bindings.put(key, target);

    return this;

  public Map<Key> getBindings() {
    return Collections.unmodifiableMap(bindings);

  public int hashCode() {
    return bindings.hashCode();

  public boolean equals(Object obj) {
    return (obj instanceof BindingCollector) && bindings.equals(((BindingCollector) obj).bindings);

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