/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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 javax.faces.internal;

 import java.util.Map;

 import java.util.Random;

 import javax.faces.FacesException;

 import javax.faces.context.ExternalContext;

 import org.seasar.framework.util.StringUtil;

 import org.seasar.teeda.core.JsfConstants;

 /**

  * @author higa

  *

  */

 public abstract class WindowIdUtil {

     public static final String NEWWINDOW = "newwindow";

     public static final String WID = "wid";

     private static final String BLANK = "_blank";

     private static Random random = new Random(System.currentTimeMillis());

     protected WindowIdUtil() {

     }

     public static String setupWindowId(final ExternalContext externalContext)

             throws FacesException {

         String wid = null;

         if (needNewWindow(externalContext.getRequestParameterMap())) {

             wid = createWindowId();

         } else {

             Map paramMap = externalContext.getRequestParameterMap();

             wid = (String) paramMap.get(WID);

         }

         setWindowId(externalContext, wid);

         return wid;

     }

     public static synchronized String createWindowId() {

         return Long.toString(random.nextLong());

     }

     public static String getWindowId(final ExternalContext externalContext)

             throws FacesException {

         Map requestMap = externalContext.getRequestMap();

         return (String) requestMap.get(WindowIdUtil.WID);

     }

     public static void setWindowId(final ExternalContext externalContext,

             String wid) throws FacesException {

         Map requestMap = externalContext.getRequestMap();

         requestMap.put(WID, wid);

     }

     public static boolean isNewWindowTarget(String target) {

         if (StringUtil.isEmpty(target)) {

             return false;

         }

         return BLANK.equals(target) || target.charAt(0) != '_';

     }

     public static boolean needNewWindow(final Map parameterMap) {

         final String newwindow = (String) parameterMap.get(NEWWINDOW);

         return JsfConstants.TRUE.equals(newwindow);

     }

 }