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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

/*
 *    AbstractOffscreenChartRenderer.java
 *    Copyright (C) 2011-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.beans;

import java.util.ArrayList;
import java.util.List;

import weka.core.Attribute;
import weka.core.Instance;
import weka.core.Instances;

/**
 * Abstract base class for offscreen chart renderers. Provides a method
 * for retrieving options and a convenience method for getting the
 * index of an attribute given its name.
 * 
 * @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
 * @version $Revision: 8034 $
 */
public abstract class AbstractOffscreenChartRenderer implements OffscreenChartRenderer {
  
  /**
   * Utility method that splits the supplied Instances out to a list
   * of Instances, where each Instances object contains just the instances
   * of one nominal class value. Does not check whether the supplied class
   * index is a nominal attribute.
   * 
   * @param insts the instances to split
   * @param classIndex the index of the nominal class attribute
   * @return a list of instances
   */
  protected List splitToClasses(Instances insts, int classIndex) {
    List newSeries = new ArrayList();
    
    Instances[] classes = new Instances[insts.attribute(classIndex).numValues()];
    for (int i = 0; i < classes.length; i++) {
      classes[i] = new Instances(insts, 0);
      classes[i].setRelationName(insts.attribute(classIndex).value(i));
    }
    
    for (int i = 0; i < insts.numInstances(); i++) {
      Instance current = insts.instance(i);
      classes[(int)current.value(classIndex)].add((Instance)current.copy());
    }
    
    for (int i = 0; i < classes.length; i++) {
      newSeries.add(classes[i]);
    }
    
    return newSeries;
  }
    
  /**
   * Gets a short list of additional options (if any),
   * suitable for displaying in a tip text, in HTML form. Concrete
   * subclasses should override this if they can actually process
   * additional options.
   * 
   * @return additional options description in simple HTML form
   */
  public String optionsTipTextHTML() {
    return "No options for this renderer";
  }
  
  /**
   * Utility method for retrieving the value of an option from a
   * list of options. Returns null if the option to get isn't
   * present in the list, an empty string if it is but no value
   * has been specified (i.e. option is a flag) or the value
   * of the option.
   * 
   * Format is:
   * optionName=optionValue
   * 
   * @param options a list of options
   * @param toGet the option to get the value of
   * @return
   */
  protected String getOption(List options, String toGet) {
    String value = null;
    
    if (options == null) {
      return null;
    }
    
    for (String option : options) {
      if (option.startsWith(toGet)) {
        String[] parts = option.split("=");
        if (parts.length != 2) {
          return ""; // indicates a flag
        }
        value = parts[1];
        break;
      }
    }
    
    return value;
  }
  
  /**
   * Get the index of a named attribute in a set of Instances.
   * 
   * @param insts the Instances
   * @param attName the name of the attribute.
   * 
   * @return the index of the attribute or -1 if the attribute is
   * not in the Instances.
   */
  protected int getIndexOfAttribute(Instances insts, String attName) {
    
    if (attName == null) {
      return -1;
    }
    
    // special first and last strings
    if (attName.equalsIgnoreCase("/last")) {
      return insts.numAttributes() - 1;
    }
    if (attName.equalsIgnoreCase("/first")) {
      return 0;
    }
    if (attName.startsWith("/")) {
      // try and parse remainder as a number
      String numS = attName.replace("/", "");
      try {
        int index = Integer.parseInt(numS);
        index--; // from 1-based to 0-based
        if (index >= 0 && index < insts.numAttributes()) {
          return index;
        }
      } catch (NumberFormatException e) {        
      }      
    }
    
    Attribute att = insts.attribute(attName);
    if (att != null) {
      return att.index();
    }
    
    return -1; // not found
  }  
}