How to use

getVariableValue

method

in

weka.core.Environment

 @Override
 public Object getSelectedItem() {
  Object item = super.getSelectedItem();
  if (item instanceof String) {
   if (env.getVariableValue((String) item) != null) {
    String newS = "${" + (String) item + "}";
    item = newS;
   }
  }
  return item;
 }
};

 @Override
 public Object getSelectedItem() {
  Object item = super.getSelectedItem();
  if (item instanceof String) {
   if (env.getVariableValue((String) item) != null) {
    String newS = "${" + (String) item + "}";
    item = newS;
   }
  }
  return item;
 }
};

 @Override
 public Object getSelectedItem() {
  Object item = super.getSelectedItem();
  if (item instanceof String) {
   if (env.getVariableValue((String) item) != null) {
    String newS = "${" + (String) item + "}";
    item = newS;
   }
  }
  return item;
 }
};

 @Override
 public String getProperty(String key) {
  // allow system-wide properties to override
  if (m_env == null) {
   m_env = Environment.getSystemWide();
  }
  String result = m_env.getVariableValue(key);

  if (result == null) {
   result = super.getProperty(key);
  }

  return result;
 }
}

 @Override
 public Object getSelectedItem() {
  Object item = super.getSelectedItem();
  if (item instanceof String) {
   if (env.getVariableValue((String) item) != null) {
    String newS = "${" + (String) item + "}";
    item = newS;
   }
  }
  return item;
 }
};

 @Override
 public String getProperty(String key) {
  // allow system-wide properties to override
  if (m_env == null) {
   m_env = Environment.getSystemWide();
  }
  String result = m_env.getVariableValue(key);

  if (result == null) {
   result = super.getProperty(key);
  }

  return result;
 }
}

/**
 * Returns entries from the WEKA_CLASSPATH property (if set).
 *
 * @return an array of URLs, one for each part of the WEKA_CLASSPATH
 */
private URL[] getWekaClasspathEntries() {
 String wekaCp =
  Environment.getSystemWide().getVariableValue("WEKA_CLASSPATH");
 // assume the system separator is being used
 String sep = System.getProperty("path.separator", ":");
 if (wekaCp != null) {
  return getParts(wekaCp, sep);
 }
 return new URL[0];
}

/**
 * Returns entries from the WEKA_CLASSPATH property (if set).
 *
 * @return an array of URLs, one for each part of the WEKA_CLASSPATH
 */
private URL[] getWekaClasspathEntries() {
 String wekaCp =
  Environment.getSystemWide().getVariableValue("WEKA_CLASSPATH");
 // assume the system separator is being used
 String sep = System.getProperty("path.separator", ":");
 if (wekaCp != null) {
  return getParts(wekaCp, sep);
 }
 return new URL[0];
}

String numMaps = m_env.getVariableValue(TOTAL_NUMBER_OF_MAPS);
if (numMaps != null && numMaps.length() > 0) {
 int nM = Integer.parseInt(numMaps);

private void buildAssociations(Instances data) throws Exception {
 // see if there is an environment variable with
 // options for the associator
 if (m_env != null && m_Associator instanceof OptionHandler) {
  String opts = m_env
   .getVariableValue("weka.gui.beans.associator.schemeOptions");
  if (opts != null && opts.length() > 0) {
   String[] options = Utils.splitOptions(opts);
   if (options.length > 0) {
    try {
     ((OptionHandler) m_Associator).setOptions(options);
    } catch (Exception ex) {
     String warningMessage = "[Associator] WARNING: unable to set options \""
      + opts + "\"for " + m_Associator.getClass().getName();
     if (m_log != null) {
      m_log.logMessage(warningMessage);
     } else {
      System.err.print(warningMessage);
     }
    }
   }
  }
 }
 m_Associator.buildAssociations(data);
}

private void buildAssociations(Instances data) throws Exception {
 // see if there is an environment variable with
 // options for the associator
 if (m_env != null && m_Associator instanceof OptionHandler) {
  String opts = m_env
   .getVariableValue("weka.gui.beans.associator.schemeOptions");
  if (opts != null && opts.length() > 0) {
   String[] options = Utils.splitOptions(opts);
   if (options.length > 0) {
    try {
     ((OptionHandler) m_Associator).setOptions(options);
    } catch (Exception ex) {
     String warningMessage = "[Associator] WARNING: unable to set options \""
      + opts + "\"for " + m_Associator.getClass().getName();
     if (m_log != null) {
      m_log.logMessage(warningMessage);
     } else {
      System.err.print(warningMessage);
     }
    }
   }
  }
 }
 m_Associator.buildAssociations(data);
}

if (env.getVariableValue(var.trim()) == null) {

if (env.getVariableValue(var.trim()) == null) {

String wh = env.getVariableValue("WEKA_HOME");
if (wh != null) {
 WEKA_HOME = new File(wh);
  env.getVariableValue("weka.core.wekaPackageRepositoryURL");
 if (repURL == null || repURL.length() == 0) {
String offline = env.getVariableValue("weka.packageManager.offline");
if (offline != null) {
 m_offline = offline.equalsIgnoreCase("true");
 env.getVariableValue("weka.packageManager.loadPackages");
if (loadPackages == null) {
 loadPackages = env.getVariableValue("weka.core.loadPackages");
  if (loadPackages == null) {
   loadPackages = env.getVariableValue("weka.core.loadPackages");

String val = env.getVariableValue(key.getKey());
if (val != null) {
 value = stringToT(val, defaultValue);

String val = env.getVariableValue(key.getKey());
if (val != null) {
 value = stringToT(val, defaultValue);

Set<String> vars = flowEnv.getVariableNames();
for (String var : vars) {
 env.put(var, flowEnv.getVariableValue(var));

Set<String> vars = flowEnv.getVariableNames();
for (String var : vars) {
 env.put(var, flowEnv.getVariableValue(var));

&& currentEnv.getVariableValue(key) == null) {
getStepManager()
 .logDetailed("Setting variable: " + key + " = " + value);

&& currentEnv.getVariableValue(key) == null) {
getStepManager()
 .logDetailed("Setting variable: " + key + " = " + value);