CombinedConfiguration#clone() does not clone properties set/changed on the
CombinedConfiguration that are stored in combinedRoot (which seems NOT to be
cloned).
Bug, feature or "You are using it wrong!"?
Demonstration program:
import org.apache.commons.configuration.*;
import org.apache.commons.configuration.tree.OverrideCombiner;
import java.util.Iterator;
public class CommonsConfigurationTester {
private static final String FOO_KEY = "Test.foo";
private static final String BAR_KEY = "Test.bar";
public static void main(String[] args) {
new CommonsConfigurationTester().ccTest();
}
void ccTest() {
HierarchicalConfiguration defaultConfig = new
HierarchicalConfiguration();
defaultConfig.addProperty(FOO_KEY, Integer.valueOf(1));
defaultConfig.addProperty(BAR_KEY, Integer.valueOf(2));
System.out.println("Default config:\n" + configToString(defaultConfig));
HierarchicalConfiguration individualConfig = new
HierarchicalConfiguration();
individualConfig.addProperty(FOO_KEY, Integer.valueOf(3));
individualConfig.addProperty(BAR_KEY, Integer.valueOf(4));
System.out.println("Individual config (has precedence):\n" +
configToString(individualConfig));
CombinedConfiguration combinedConfig = new CombinedConfiguration(new
OverrideCombiner());
combinedConfig.addConfiguration(individualConfig);
combinedConfig.addConfiguration(defaultConfig);
System.out.println("Combined config (default + individual):\n" +
configToString(combinedConfig));
combinedConfig.setProperty(FOO_KEY, Integer.valueOf(5));
combinedConfig.setProperty(BAR_KEY, Integer.valueOf(6));
System.out.println("Changed config (default + individual):\n" +
configToString(combinedConfig));
CombinedConfiguration combinedConfig2 =
(CombinedConfiguration)combinedConfig.clone();
System.out.println("Cloned changed config (default + individual):\n" +
configToString(combinedConfig2));
}
/**
* A little helper method to get all the settings of a configuration into a
String
* @param config the Configuration whose String representation we want
* @return a String containing the key-value pairs
*/
static String configToString(Configuration config) {
String pairs = new String();
for (Iterator keys = config.getKeys(); keys.hasNext();) {
String key = (String)keys.next();
pairs = pairs + key + '=' + config.getProperty(key) + '\n';
}
return pairs;
}
}
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