/**
 * Copyright (c) 2004
 *      Ali Onur Cinar <cinar(a)zdo.com>
 *
 * License:
 *
 *   Permission  to  use,  copy, modify, and  distribute  this software and its
 *   documentation   for  educational   purposes  and  without  fee  is  hereby
 *   granted,  provided  that the  above  copyright notice appear in all copies
 *   and  that both  the  copyright  notice  and  this  permission  notice  and
 *   warranty  disclaimer appear in supporting documentation, and that the name
 *   of Ali Onur Cinar not be  used  in  advertising or publicity pertaining to
 *   distribution of the software without specific, written prior permission.
 *
 * @author     A. Onur Cinar <cinar(a)zdo.com>
 * @version    %W% %G% ZDO
 * @version    $Id: Join.java,v 1.1 2004/09/21 13:12:05 cinar Exp $ ZDO
 * @since      1.0
 */

package com.zdo.ant;

import java.util.List;
import java.util.Vector;
import java.util.ListIterator;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.types.FileSet;

public class Join extends Task
{
  /**
   * Default Constructor. 
   *
   */
  public Join()
  {
    fileSets = new Vector();
    setSeparator(",");
  }

  /**
   * Sets the separator string.
   * 
   * @param p separator string
   */
  public void setSeparator(String p)
  {
    separator = p;
  }

  /**
   * Returns the separator string.
   * 
   * @return separator string
   */
  public String getSeparator()
  {
    return separator;
  }

  /**
   * Sets the property name which
   * will hold the result.
   * 
   * @param p property name
   */
  public void setProperty(String p)
  {
    property = p;
  }

  /**
   * Returns the property name which
   * will hold the result.
   * 
   * @return property name
   */
  public String getProperty()
  {
    return property;
  }

  /**
   * Adds a file set.
   * 
   * @param p file set
   */
  public void addFileset(FileSet p)
  {
    fileSets.add(p);
  }

  /**
   * Executes the task.
   * 
   * @throws BuildException if property name
   *         is not defined.
   */
  public void execute()
    throws BuildException
  {
    if(property == null)
    {
       throw new BuildException(
         "property attribute is required", 
		 getLocation());
    }

    StringBuffer joinString = new StringBuffer();

    ListIterator iterator = fileSets.listIterator();

    while (iterator.hasNext())                        // for each file set
    {
       FileSet fileSet = (FileSet)iterator.next();    // get only included
       String files[] = fileSet.getDirectoryScanner(  // files
       	 getProject()).getIncludedFiles();

       for (int i=0; i < files.length; i++)           // for each file
       {
          if(joinString.length() > 0)                 // use separator
          {
            joinString.append(separator);
          }

          joinString.append(files[i]);                // add to list
       }
    }

    getProject().setProperty(property,                // set property value
      joinString.toString());
  }

  /** Class Data */
  protected String separator;
  protected List fileSets;
  protected String property;
}