2009/05/20 - Apache Shale has been retired.

 /*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to you 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.

  *

  * $Id: Application.java 464373 2006-10-16 04:21:54Z rahul $

  */

 package org.apache.shale.examples.sqlbrowser;

 import java.util.ArrayList;

 import java.util.List;

 import javax.faces.FacesException;

 import javax.faces.context.FacesContext;

 import javax.faces.model.SelectItem;

 import javax.naming.Context;

 import javax.naming.InitialContext;

 import javax.naming.NameClassPair;

 import javax.naming.NamingEnumeration;

 import javax.sql.DataSource;

 import org.apache.shale.tiger.managed.Bean;

 import org.apache.shale.tiger.managed.Scope;

 /**

  * <p>Application scope managed bean for the SQL Browser application.</p>

  */

 @Bean(name="appbean", scope=Scope.APPLICATION)

 public class Application {

     public Application() {

         System.err.println("Application constructor()");

     }

     // ------------------------------------------------------ Manifest Constants

     /**

      * <p>The prefix of the JNDI name for all relevant data sources.</p>

      */

     private static final String PREFIX = "java:comp/env";

     // ------------------------------------------------------ Instance Variables

     /**

      * <p>The list of <code>DataSource</code>s available via JNDI for this

      * web application.</p>

      */

     private SelectItem[] dataSources = null;

     // ---------------------------------------------------------- Public Methods

     /**

      * <p>Return the list of <code>DataSource</code>s available via JNDI

      * for this web application.</p>

      */

     public SelectItem[] getDataSources() {

         System.err.println("Application getDataSources()");

         if (dataSources == null) {

             List<SelectItem> list = new ArrayList<SelectItem>();

             internal(list);

             try {

                 InitialContext context = new InitialContext();

                 append(context, PREFIX, list);

             } catch (Exception e) {

                 throw new FacesException(e);

             }

             dataSources = (SelectItem[]) list.toArray(new SelectItem[list.size()]);

         }

         System.err.println("Application getDataSources() --> " + dataSources.length);

         return dataSources;

     }

     // --------------------------------------------------------- Private Methods

     /**

      * <p>Append any data sources found in the specified JNDI context

      * to the specified list.  If a JNDI subcontext is found, apply this

      * method recursively.</p>

      *

      * @param context JNDI context to be searched

      * @param prefix Prefix for the fully qualified resource names to be added

      * @param list List of data sources to which new ones should be added

      */

     private void append(Context context, String prefix, List<SelectItem> list) {

         ClassLoader cl = Thread.currentThread().getContextClassLoader();

         if (cl == null) {

             cl = Application.class.getClassLoader();

         }

         try {

             NamingEnumeration<NameClassPair> entries = context.list(prefix);

             while (entries.hasMore()) {

                 NameClassPair entry = entries.next();

                 Class clazz = cl.loadClass(entry.getClassName());

                 if (DataSource.class.isAssignableFrom(clazz)) {

                     list.add(new SelectItem(prefix + "/" + entry.getName(),

                                             (prefix + "/" + entry.getName()).substring(PREFIX.length())));

                 } else if (Context.class.isAssignableFrom(clazz)) {

                     Context search = (Context) context.lookup(entry.getName());

                     append(search, prefix + "/" + entry.getName(), list);

                 }

             }

         } catch (Exception e) {

             throw new FacesException(e);

         }

     }

     /**

      * <p>Append the default internal data source for this application.</p>

      *

      * @param list List of <code>SelectItem</code> of available data sources

      */

     private void internal(List<SelectItem> list) {

         FacesContext context = FacesContext.getCurrentInstance();

         // FIXME - localize the label

         list.add(new SelectItem("", "(Internal)"));

     }

 }