[CJ-dev] commonjava-projects/commonjava-diff/cli/src/java/org/commonjava/diff/cli Main.java,NONE,1.1

[John C. <joh...@co...>]

Update of /cvsroot/commonjava/commonjava-projects/commonjava-diff/cli/src/java/org/commonjava/diff/cli
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv17552/cli/src/java/org/commonjava/diff/cli

Added Files:
	Main.java 
Log Message:
o Separated Main into subproject called 'cli' to remove requirement for commonjava-console in main diff engine project, 
o Removed dependency on FileSizeConstants, and hence commonjava-util
o Copied DescriptiveStats from commonjava-math to . (commonjava-diff) to remove dependency on that lib.
o Re-tested engine, and all's well.

--- NEW FILE: Main.java ---
/* Created on Jan 16, 2004 */
package org.commonjava.diff.cli;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

import org.commonjava.console.Command;
import org.commonjava.console.CommandLine;
import org.commonjava.console.CommandLineException;
import org.commonjava.console.option.Arg;
import org.commonjava.console.option.Option;
import org.commonjava.console.option.OptionFormat;
import org.commonjava.console.option.SingleArgOptionalOption;
import org.commonjava.console.option.SingleArgRequiredOption;

/**
 * @author jdcasey
 */
public class Main extends Command{
  
  private static final Option OLD = new SingleArgRequiredOption('o', "old", OptionFormat.FILE_FORMAT, "Old file.");
  private static final Option NEW = new SingleArgRequiredOption('n', "new", OptionFormat.FILE_FORMAT, "New file.");
  private static final Option MAX_LINE_LEN = new SingleArgOptionalOption('l', "maxlength", OptionFormat.NUMBER_FORMAT, "Maximum Line Length.");
  
  private static final Option[] TEMPLATE = {OLD, NEW, MAX_LINE_LEN};
  
  public static final int CODE_OK = 0;
  public static final int CODE_OLD_FILE_MISSING = -1;
  public static final int CODE_OLD_FILE_ERROR = -2;
  public static final int CODE_NEW_FILE_MISSING = -3;
  public static final int CODE_NEW_FILE_ERROR = -4;
  public static final int CODE_ERROR_COMPUTING_DIFF = -5;
  
  public static void main(String[] args) {
    try {
	    Main main = new Main();
    
      main.setIn(System.in);
      main.setOut(System.out);
      main.setErr(System.err);
      
      main.parseArgs(args);
      main.executeCommand();
    }
    catch (CommandLineException e) {
      e.printStackTrace();
    }
  }

  /**
   * @param description
   */
  public Main() {
    super("Compute the differences between two files.");
    addCommandTemplate(TEMPLATE);
  }
  
  /* (non-Javadoc)
   * @see org.commonjava.console.Command#executeCommand()
   */
  public int executeCommand() throws CommandLineException {
    CommandLine cmdLine = getCommandLine();
    
    Arg oldArg = (Arg)cmdLine.getOption(OLD.getLongName());
    Arg newArg = (Arg)cmdLine.getOption(NEW.getLongName());
    Arg lineLen = (Arg)cmdLine.getOption(MAX_LINE_LEN.getLongName());
    
    File old = (File)oldArg.getValue();
    File neo = (File)newArg.getValue();
    
    Long maxLen = null;
    if(lineLen.hasValue()) {
      maxLen = (Long)lineLen.getValue();
    }
    
    FileInputStream oldIn = null;
    MappedByteBuffer oldMap = null;
    try {
      oldIn = new FileInputStream(old);
      FileChannel oldChannel = oldIn.getChannel();
      oldMap = oldChannel.map(FileChannel.MapMode.READ_ONLY, 0, oldChannel.size());
    }
    catch (FileNotFoundException e) {
      e.printStackTrace(getErr());
      getErr().flush();
      return CODE_OLD_FILE_MISSING;
    }
    catch (IOException e) {
      e.printStackTrace(getErr());
      getErr().flush();
      return CODE_OLD_FILE_ERROR;
    }
    
    FileInputStream newIn = null;
    MappedByteBuffer newMap = null;
    try {
      newIn = new FileInputStream(neo);
      FileChannel newChannel = newIn.getChannel();
      newMap = newChannel.map(FileChannel.MapMode.READ_ONLY, 0, newChannel.size());
    }
    catch (FileNotFoundException e) {
      e.printStackTrace(getErr());
      getErr().flush();
      return CODE_NEW_FILE_MISSING;
    }
    catch (IOException e) {
      e.printStackTrace(getErr());
      getErr().flush();
      return CODE_NEW_FILE_ERROR;
    }
    
    DiffOperation[] ops = null;
    try {
      if (maxLen == null) {
        ops = DiffEngine.getInstance().compute(oldMap, newMap);
      }
      else {
        ops = DiffEngine.getInstance().compute(oldMap, newMap, maxLen.intValue());
      }
    }
    catch (IOException e) {
      e.printStackTrace(getErr());
      getErr().flush();
      return CODE_ERROR_COMPUTING_DIFF;
    }
    
    return CODE_OK;
  }
  
}