/*
    * 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.
   */
  
  package org.apache.hadoop.chukwa.util;
  
  
  import java.io.*;
  import java.util.*;
  
  public class ClusterConfig {
    public static final HashMap<String, String> clusterMap = new HashMap<String, String>();
    private String path = System.getenv("CHUKWA_CONF_DIR") + File.separator;
  
    static public String getContents(File aFile) {
      // ...checks on aFile are elided
      StringBuffer contents = new StringBuffer();
  
      try {
        // use buffering, reading one line at a time
        // FileReader always assumes default encoding is OK!
        BufferedReader input = new BufferedReader(new FileReader(aFile));
        try {
          String line = null; // not declared within while loop
          /*
           * readLine is a bit quirky : it returns the content of a line MINUS the
           * newline. it returns null only for the END of the stream. it returns
           * an empty String if two newlines appear in a row.
           */
          while ((line = input.readLine()) != null) {
            contents.append(line);
            contents.append(System.getProperty("line.separator"));
          }
        } finally {
          input.close();
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
  
      return contents.toString();
    }
  
    public ClusterConfig() {
      File cc = new File(path + "jdbc.conf");
      String buffer = getContents(cc);
      String[] lines = buffer.split("\n");
      for (String line : lines) {
        String[] data = line.split("=", 2);
        clusterMap.put(data[0], data[1]);
      }
    }
  
    public String getURL(String cluster) {
      String url = clusterMap.get(cluster);
      return url;
    }
  
    public Iterator<String> getClusters() {
      Set<String> keys = clusterMap.keySet();
      Iterator<String> i = keys.iterator();
      return i;
    }
  }