How to use

mergePropertySets

method

in

org.apache.tools.ant.types.CommandlineJava$SysProperties

/**
 * Get the size of the sysproperties instance. This merges all
 * property sets, so is not an O(1) operation.
 * @return the size of the sysproperties instance.
 */
public int size() {
  Properties p = mergePropertySets();
  return variables.size() + p.size();
}

/**
 * Add all definitions (including property sets) to a list.
 * @param listIt list iterator supporting add method.
 */
public void addDefinitionsToList(ListIterator<String> listIt) {
  String[] props = super.getVariables();
  if (props != null) {
    for (String prop : props) {
      listIt.add("-D" + prop);
    }
  }
  Properties propertySetProperties = mergePropertySets();
  for (String key : propertySetProperties.stringPropertyNames()) {
    listIt.add("-D" + key + "=" + propertySetProperties.getProperty(key));
  }
}

/**
 * Cache the system properties and set the system properties to the
 * new values.
 * @throws BuildException if Security prevented this operation.
 */
public void setSystem() throws BuildException {
  try {
    sys = System.getProperties();
    Properties p = new Properties();
    for (String name : sys.stringPropertyNames()) {
      String value = sys.getProperty(name);
      if (value != null) {
        p.put(name, value);
      }
    }
    p.putAll(mergePropertySets());
    for (Environment.Variable v : variables) {
      v.validate();
      p.put(v.getKey(), v.getValue());
    }
    System.setProperties(p);
  } catch (SecurityException e) {
    throw new BuildException("Cannot modify system properties", e);
  }
}