RedirectParameterInjectionHandler.java :  » Web-Framework » Strecks » org » strecks » injection » handler » Java Open Source

/*
 * Copyright 2005-2006 the original author or authors.
 * 
 * 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 org.strecks.injection.handler;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.strecks.constants.InfrastructureKeys;
import org.strecks.context.ActionContext;
import org.strecks.util.Assert;

/**
 * Injection handler to find redirect parameter from the <code>HttpServletRequest</code> by using the
 * <code>HttpServletRequest.getAttribute(InfrastructureKeys.REDIRECT_PARAMETERS)</code> method. No type conversion is
 * necessary
 * @author Phil Zoio
 */
public class RedirectParameterInjectionHandler implements InjectionHandler
{

  private String parameterName;

  public RedirectParameterInjectionHandler(String parameterName)
  {

    super();

    Assert.notNull(parameterName);
    this.parameterName = parameterName;

  }

  public String getParameterName()
  {
    return parameterName;
  }

  public Object getValue(ActionContext injectionContext)
  {

    HttpServletRequest request = injectionContext.getRequest();

    HttpSession session = request.getSession(false);

    if (session == null)
    {
      return null;
    }
    else
    {
      Map map = (Map) session.getAttribute(InfrastructureKeys.REDIRECT_PARAMETERS);
      if (map != null)
      {
        return map.get(parameterName);
      }
      return null;
    }
  }

}