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Java example source code file (FactoryProxy.java)

This example Java source code file (FactoryProxy.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

creationlistener, dependency, errorsexception, factoryproxy, injectorimpl, internalcontext, internalfactory, key, object, override, string

The FactoryProxy.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.internal;

import com.google.common.base.MoreObjects;
import com.google.inject.Key;
import com.google.inject.internal.InjectorImpl.JitLimitation;
import com.google.inject.spi.Dependency;

/**
 * A placeholder which enables us to swap in the real factory once the injector is created.
 * Used for a linked binding, so that getting the linked binding returns the link's factory.
 */
final class FactoryProxy<T> implements InternalFactory, CreationListener {

  private final InjectorImpl injector;
  private final Key<T> key;
  private final Key<? extends T> targetKey;
  private final Object source;

  private InternalFactory<? extends T> targetFactory;

  FactoryProxy(InjectorImpl injector, Key<T> key, Key targetKey, Object source) {
    this.injector = injector;
    this.key = key;
    this.targetKey = targetKey;
    this.source = source;
  }

  public void notify(final Errors errors) {
    try {
      targetFactory = injector.getInternalFactory(targetKey, errors.withSource(source), JitLimitation.NEW_OR_EXISTING_JIT);
    } catch (ErrorsException e) {
      errors.merge(e.getErrors());
    }
  }

  public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
      throws ErrorsException {
    context.pushState(targetKey, source);
    try {
      return targetFactory.get(errors.withSource(targetKey), context, dependency, true);
    } finally {
      context.popState();
    }
  }

  @Override public String toString() {
    return MoreObjects.toStringHelper(FactoryProxy.class)
        .add("key", key)
        .add("provider", targetFactory)
        .toString();
  }
}

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