package org.lcsim.mc.fast.tracking;
   
   import java.io.BufferedReader;
   import java.io.IOException;
   import java.io.Reader;
   import java.util.HashMap;
   import java.util.Map;
   import java.util.StringTokenizer;
   
  public class ResolutionTable {
      private Map hash = new HashMap();
  
      public ResolutionTable(Reader in) throws IOException {
          BufferedReader inn = new TrimReader(in);
          setupTable(inn);
          inn.close();
      }
  
      LookupTable findTable(String name) {
          return (LookupTable) hash.get(name);
      }
  
      public LookupTable findTable(int i, int j) {
          String name = String.format("(%s,%s):", i + 1, j + 1);
          // System.out.printf("%s\n", name);
          return findTable(name);
      }
  
      void setupTable(BufferedReader in) throws IOException {
          // constant string to read Bruce's resolution table ini files
          String tokenLine = "Cov matrix entry";
  
          // Start by reading the parameter file
          for (;;) {
              String line = in.readLine();
              if (line == null)
                  break;
  
              //
              // ww, 10/05/2000
              //
              // transform Bruce's cov matrix element index format into LCDs
              // ie "Cov matrix entry  n,  n"
              // to "(n,n):"
              //
              int elementI = 0;
              int elementJ = 0;
              if (line.indexOf(tokenLine) > -1) {
                  String nLine = line.substring(line.indexOf(tokenLine) + tokenLine.length());
                  StringBuffer sb = new StringBuffer("(");
                  StringTokenizer tokenizer = new StringTokenizer(nLine, " ,");
                  if (tokenizer.countTokens() == 2) {
                      String token = tokenizer.nextToken();
                      elementI = Integer.parseInt(token) - 1; // lcdtrk starts from 1
                      sb.append(token);
                      sb.append(",");
                      token = tokenizer.nextToken();
                      elementJ = Integer.parseInt(token) - 1; // lcdtrk starts from 1
                      sb.append(token);
                      sb.append("):");
                  } else {
                      sb.append("--none--)");
                  }
                  line = sb.toString();
              }
  
              // end of addition
              if (!line.endsWith(":")) {
                  throw new IOException("Syntax error in ResolutionTable");
              }
              hash.put(line, new LookupTable(in, elementI, elementJ));
          }
      }
  
      private class TrimReader extends BufferedReader {
          TrimReader(Reader source) {
              super(source);
          }
  
          public String readLine() throws IOException {
              for (;;) {
                  String line = super.readLine();
                  if (line == null)
                      return null;
                  line = line.trim();
                  if (line.length() > 0)
                      return line;
              }
          }
      }
  }