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Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 5, brought to you by Google.

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/**
 * Copyright (C) 2006 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;

import java.util.HashMap;
import java.util.Map;

/**
 * Internal context. Used to coordinate injections and support circular
 * dependencies.
 *
 * @author [email protected] (Bob Lee)
 */
class InternalContext {

  final InjectorImpl injector;
  Map> constructionContexts;
  ExternalContext externalContext;

  InternalContext(InjectorImpl injector) {
    this.injector = injector;
  }

  InjectorImpl getInjectorImpl() {
    return injector;
  }

  @SuppressWarnings("unchecked")
   ConstructionContext getConstructionContext(Object key) {
    if (constructionContexts == null) {
      constructionContexts = new HashMap>();
      ConstructionContext constructionContext = new ConstructionContext();
      constructionContexts.put(key, constructionContext);
      return constructionContext;
    }
    else {
      ConstructionContext constructionContext
          = (ConstructionContext) constructionContexts.get(key);
      if (constructionContext == null) {
        constructionContext = new ConstructionContext();
        constructionContexts.put(key, constructionContext);
      }
      return constructionContext;
    }
  }

  @SuppressWarnings("unchecked")
   ExternalContext getExternalContext() {
    return (ExternalContext) externalContext;
  }

  Class getExpectedType() {
    return externalContext.getKey().getRawType();
  }

  void setExternalContext(ExternalContext externalContext) {
    this.externalContext = externalContext;
  }
}