Struts example source code file (InternalContext.java)

This example Struts source code file (InternalContext.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

constructioncontext, constructioncontext, containerimpl, containerimpl, externalcontext, externalcontext, hashmap, illegalstateexception, internalcontext, internalcontext, map, please, suppresswarnings, t, util

The Struts InternalContext.java source code

/**
 * 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.opensymphony.xwork2.inject;

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

/**
 * Internal context. Used to coordinate injections and support circular
 * dependencies.
 *
 * @author crazybob@google.com (Bob Lee)
 */
class InternalContext {

  final ContainerImpl container;
  final Map<Object, ConstructionContext constructionContexts =
      new HashMap<Object, ConstructionContext();
  Scope.Strategy scopeStrategy;
  ExternalContext<?> externalContext;

  InternalContext(ContainerImpl container) {
    this.container = container;
  }

  public Container getContainer() {
    return container;
  }

  ContainerImpl getContainerImpl() {
    return container;
  }

  Scope.Strategy getScopeStrategy() {
    if (scopeStrategy == null) {
      scopeStrategy = (Scope.Strategy) container.localScopeStrategy.get();

      if (scopeStrategy == null) {
        throw new IllegalStateException("Scope strategy not set. "
            + "Please call Container.setScopeStrategy().");
      }
    }

    return scopeStrategy;
  }

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

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

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