/*

  * Copyright 2001,2004 The Apache Software Foundation.

  * 

  * 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.apache.commons.scaffold.sql;

 import java.util.Properties;

 import org.apache.commons.scaffold.lang.PropertiesException;

 import org.apache.commons.scaffold.util.ResourceUtils;

 /**

  * @author Ted Husted

  * @author OK State DEQ

  * @version $Revision: 155464 $ $Date: 2005-02-26 13:26:54 +0000 (Sat, 26 Feb 2005) $

  */

 public class CommandStore {

     /**

      * The path to a default properties file if not given in the constructor

      * ["resources/command.properties"].

      */

     private static String COMMAND_STORE_PATH = "resources/command.properties";

     private static String DOT = ".";

     /**

      * Our Properties field.

      * @todo refactor to use Collection based on preface.

      */

     protected static Properties properties;

     public static Properties getProperties(String preface) {

         if (null==properties) {

             try {

                 properties = ResourceUtils.loadProperties(COMMAND_STORE_PATH);

             }

             catch (Exception e) {

                  throw new IllegalArgumentException();

             }

         }

         if (null==properties) throw new IllegalArgumentException();

         return properties;

     }

     /**

      * Retrieve command from Properties store for <code>preface</code>

      * and <code>key</code>.

      *

      * @fixme Could use a merge feature to reuse common substrings,

      * like table names ["SELECT ${searchFields} FROM ${articleTable}"]

      * @todo Refactor to make appending preface.key optional

      */

     public static String getProperty(String preface, String key)

         throws PropertiesException {

         if (null==properties) properties = getProperties(preface);

         // :TODO: refactor to make appending preface.key optional

         StringBuffer sb = new StringBuffer(preface);

         sb.append(DOT);

         sb.append(key);

         return properties.getProperty(sb.toString());

     }

     /**

      * Constructor to pass a properties file.

      * Store instance in application scope.

      */

     public CommandStore(Properties properties) {

         CommandStore.properties = properties;

     }

 }