Examples of org.apache.commons.configuration.HierarchicalConfiguration

Package org.apache.commons.configuration

Examples of org.apache.commons.configuration.HierarchicalConfiguration

org.apache.commons.configuration.HierarchicalConfiguration
A specialized configuration class that extends its base class by the ability of keeping more structure in the stored properties.
There are some sources of configuration data that cannot be stored very well in a BaseConfiguration object because then their structure is lost. This is especially true for XML documents. This class can deal with such structured configuration sources by storing the properties in a tree-like organization.
The internal used storage form allows for a more sophisticated access to single properties. As an example consider the following XML document:
```
 <database> <tables> <table> <name>users</name> <fields> <field> <name>lid</name> <type>long</name> </field> <field> <name>usrName</name> <type>java.lang.String</type> </field> ... </fields> </table> <table> <name>documents</name> <fields> <field> <name>docid</name> <type>long</type> </field> ... </fields> </table> ... </tables> </database> 
```
If this document is parsed and stored in a HierarchicalConfiguration object (which can be done by one of the sub classes), there are enhanced possibilities of accessing properties. The keys for querying information can contain indices that select a certain element if there are multiple hits.
For instance the key tables.table(0).name can be used to find out the name of the first table. In opposite tables.table.name would return a collection with the names of all available tables. Similarly the key tables.table(1).fields.field.name returns a collection with the names of all fields of the second table. If another index is added after the field element, a single field can be accessed: tables.table(1).fields.field(0).name.
There is a getMaxIndex() method that returns the maximum allowed index that can be added to a given property key. This method can be used to iterate over all values defined for a certain property.

Since the 1.3 release of Commons Configuration hierarchical configurations support an expression engine. This expression engine is responsible for evaluating the passed in configuration keys and map them to the stored properties. The examples above are valid for the default expression engine, which is used when a new HierarchicalConfiguration instance is created. With the setExpressionEngine() method a different expression engine can be set. For instance with {@link org.apache.commons.configuration.tree.xpath.XPathExpressionEngine} there is an expression engine available that supports configuration keys in XPATH syntax.

In addition to the events common for all configuration classes hierarchical configurations support some more events that correspond to some specific methods and features:
EVENT_ADD_NODES
The addNodes() method was called; the event object contains the key, to which the nodes were added, and a collection with the new nodes as value.

EVENT_CLEAR_TREE
The clearTree() method was called; the event object stores the key of the removed sub tree.

EVENT_SUBNODE_CHANGED
A SubnodeConfiguration that was created from this configuration has been changed. The value property of the event object contains the original event object as it was sent by the subnode configuration.

Note:Configuration objects of this type can be read concurrently by multiple threads. However if one of these threads modifies the object, synchronization has to be performed manually.
@author Oliver Heger @version $Id: HierarchicalConfiguration.java 722238 2008-12-01 21:28:31Z oheger $

            List<String> c = ((HandlersPackage) obj).getHandlers();


            for (Iterator<String> i = c.iterator(); i.hasNext(); ) {
                String cName = i.next();


                HierarchicalConfiguration cmdConf = addHandler(cName);


                loadClass(cName, cmdConf);
            }


        } else {

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     * @param className The class name
     * @return DefaultConfiguration
     * @throws ConfigurationException 
     */
    private HierarchicalConfiguration addHandler(String className) throws ConfigurationException {
        HierarchicalConfiguration hConf = new DefaultConfigurationBuilder();
        hConf.addProperty("handler.[@class]", className);
        return hConf;
    }

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    @SuppressWarnings("unchecked")
    protected void loadCommands(HierarchicalConfiguration configuration) throws Exception {


        final List<HierarchicalConfiguration> commandConfs = configuration.configurationsAt("commands.command");
        for (int index = 0; index < commandConfs.size(); index++) {
            HierarchicalConfiguration commandConf = commandConfs.get(index);
            String commandName = commandConf.getString("[@name]").toLowerCase();
            String className = commandConf.getString("[@class]");
            loadCommand(commandName, className, commandConf);
        }
    }

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   * @return the configuration for the given  moduleType
   */
  @NotNull
  public HierarchicalConfiguration getModuleConfiguration( @NotNull Class<?> moduleType ) {
    String moduleTypeName = moduleType.getName().replaceAll( "\\$", "." );
    HierarchicalConfiguration modulesConfiguration = getModulesConfiguration();
    try {
      return modulesConfiguration.configurationAt( moduleTypeName );
    } catch ( IllegalArgumentException ignore ) {
      modulesConfiguration.addProperty( moduleTypeName, "" );
      return modulesConfiguration.configurationAt( moduleTypeName );
    }
  }

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     * @param client
     *            the client
     */
    protected void configureProxy(XMLConfiguration config, HttpClient client) {
        if (config.containsKey("proxy")) {
            final HierarchicalConfiguration proxy = config
                    .configurationAt("proxy");
            if (null != proxy) {
                final String username = proxy.getString("username", "admin");
                final String password = proxy.getString("password", "admin1");
                final String host = proxy.getString("server", "localhost");
                final int port = proxy.getInt("port", 80);


                final UsernamePasswordCredentials defaultcreds = new UsernamePasswordCredentials(
                        username, password);
                final HttpHost newProxy = new HttpHost(host, port);
                client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,

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   * @return the configuration for the given  moduleType
   */
  @NotNull
  public HierarchicalConfiguration getModuleConfiguration( @NotNull Class<?> moduleType ) {
    String moduleTypeName = moduleType.getName().replaceAll( "\\$", "." );
    HierarchicalConfiguration modulesConfiguration = getModulesConfiguration();
    try {
      return modulesConfiguration.configurationAt( moduleTypeName );
    } catch ( IllegalArgumentException ignore ) {
      modulesConfiguration.addProperty( moduleTypeName, "" );
      return modulesConfiguration.configurationAt( moduleTypeName );
    }
  }

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    @Test
    public void testPerformance() {
        MyListener listener = new MyListener();
        BaseConfiguration baseConfig = new BaseConfiguration();
        baseConfig.addConfigurationListener(listener);
        HierarchicalConfiguration hConfig = new HierarchicalConfiguration();
        hConfig.addConfigurationListener(listener);
        ConcurrentMapConfiguration conf = new ConcurrentMapConfiguration();
        conf.addConfigurationListener(listener);
        testConfigurationSet(baseConfig);
        testConfigurationSet(hConfig);
        testConfigurationSet(conf);

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    private void configureScriptEngine() {
        // the EngineController needs to be configured statically before requests start serving so that it can
        // properly construct ScriptEngine objects with the correct reset policy. allow script engines to be
        // configured so that folks can drop in different gremlin flavors.


        HierarchicalConfiguration config = new HierarchicalConfiguration();


        config.setProperty("name", "gremlin-groovy");
        config.setProperty("reset-threshold", "-1");


        List<String> imports = new ArrayList<>();
        imports.add("com.tinkerpop.gremlin.*");
        imports.add("com.tinkerpop.gremlin.java.*");
        imports.add("com.tinkerpop.gremlin.pipes.filter.*");
        imports.add("com.tinkerpop.gremlin.pipes.sideeffect.*");
        imports.add("com.tinkerpop.gremlin.pipes.transform.*");
        imports.add("com.tinkerpop.blueprints.*");
        imports.add("com.tinkerpop.blueprints.impls.*");
        imports.add("com.tinkerpop.blueprints.impls.tg.*");
        imports.add("com.tinkerpop.blueprints.impls.neo4j.*");
        imports.add("com.tinkerpop.blueprints.impls.neo4j.batch.*");
        imports.add("com.tinkerpop.blueprints.impls.orient.*");
        imports.add("com.tinkerpop.blueprints.impls.orient.batch.*");
        imports.add("com.tinkerpop.blueprints.impls.dex.*");
        imports.add("com.tinkerpop.blueprints.impls.rexster.*");
        imports.add("com.tinkerpop.blueprints.impls.sail.*");
        imports.add("com.tinkerpop.blueprints.impls.sail.impls.*");
        imports.add("com.tinkerpop.blueprints.util.*");
        imports.add("com.tinkerpop.blueprints.util.io.*");
        imports.add("com.tinkerpop.blueprints.util.io.gml.*");
        imports.add("com.tinkerpop.blueprints.util.io.graphml.*");
        imports.add("com.tinkerpop.blueprints.util.io.graphson.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.batch.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.batch.cache.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.event.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.event.listener.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.id.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.partition.*");
        imports.add("com.tinkerpop.blueprints.util.wrappers.readonly.*");
        imports.add("com.tinkerpop.blueprints.oupls.sail.*");
        imports.add("com.tinkerpop.blueprints.oupls.sail.pg.*");
        imports.add("com.tinkerpop.blueprints.oupls.jung.*");
        imports.add("com.tinkerpop.pipes.*");
        imports.add("com.tinkerpop.pipes.branch.*");
        imports.add("com.tinkerpop.pipes.filter.*");
        imports.add("com.tinkerpop.pipes.sideeffect.*");
        imports.add("com.tinkerpop.pipes.transform.*");
        imports.add("com.tinkerpop.pipes.util.*");
        imports.add("com.tinkerpop.pipes.util.iterators.*");
        imports.add("com.tinkerpop.pipes.util.structures.*");
        imports.add("org.apache.commons.configuration.*");
        imports.add("com.thinkaurelius.titan.core.*");
        imports.add("com.thinkaurelius.titan.core.attribute.*");
        imports.add("com.thinkaurelius.titan.core.util.*");
        imports.add("com.thinkaurelius.titan.example.*");
        imports.add("org.apache.commons.configuration.*");
        imports.add("com.tinkerpop.gremlin.Tokens.T");
        imports.add("com.tinkerpop.gremlin.groovy.*");
        config.setProperty("imports", imports);


        List<String> staticImports = new ArrayList<>();
        staticImports.add("com.tinkerpop.blueprints.Direction.*");
        staticImports.add("com.tinkerpop.blueprints.TransactionalGraph$Conclusion.*");
        staticImports.add("com.tinkerpop.blueprints.Compare.*");
        staticImports.add("com.thinkaurelius.titan.core.attribute.Geo.*");
        staticImports.add("com.thinkaurelius.titan.core.attribute.Text.*");
        staticImports.add("com.thinkaurelius.titan.core.TypeMaker$UniquenessConsistency.*");
        staticImports.add("com.tinkerpop.blueprints.Query$Compare.*");
        config.setProperty("static-imports", staticImports);


        EngineConfiguration engineConfiguration = new EngineConfiguration(config);


        List<EngineConfiguration> engineConfigurations = new ArrayList<>();
        engineConfigurations.add(engineConfiguration);

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     *            the httpClient
     */
    protected void configureProxy(final XMLConfiguration config,
            final HttpClient client) {
        if (config.containsKey("proxy")) {
            final HierarchicalConfiguration proxy = config
                    .configurationAt("proxy");
            if (null != proxy) {
                final String username = proxy.getString("username", "admin");
                final String password = proxy.getString("password", "admin1");
                final String host = proxy.getString("server", "localhost");
                final int port = proxy.getInt("port", 80);


                final Credentials defaultcreds = new UsernamePasswordCredentials(
                        username, password);
                client.getState().setProxyCredentials(
                        new AuthScope(host, port, AuthScope.ANY_REALM),

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        {
            throw new ConfigurationException("Only one external virtualhosts configuration file allowed, multiple filenames found.");
        }


        // Virtualhost configuration object
        Configuration vhostConfiguration = new HierarchicalConfiguration();


        // Load from embedded configuration if possible
        if (!vhostConfig.subset("virtualhost").isEmpty())
        {
            vhostConfiguration = vhostConfig;
        }
        else
        {
        // Load from the external configuration if possible
        for (String fileName : vhostFiles)
          {
              // Open the vhosts XML file and copy values from it to our config
                _vhostsFile = new File(fileName);
                if (!_vhostsFile.exists())
                {
                    throw new ConfigurationException("Virtualhosts file does not exist");
                }
            vhostConfiguration = parseConfig(new File(fileName));


                // save the default virtualhost name
                String defaultVirtualHost = vhostConfiguration.getString("default");
                _configuration.setProperty("virtualhosts.default", defaultVirtualHost);
            }
        }


        // Now extract the virtual host names from the configuration object
        List hosts = vhostConfiguration.getList("virtualhost.name");
        for (int j = 0; j < hosts.size(); j++)
        {
            String name = (String) hosts.get(j);


            // Add the virtual hosts to the server configuration
            VirtualHostConfiguration virtualhost = new VirtualHostConfiguration(name, vhostConfiguration.subset("virtualhost." + name));
            _virtualHosts.put(virtualhost.getName(), virtualhost);
        }
    }

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