Examples of org.apache.commons.configuration.tree.xpath.XPathExpressionEngine

Package org.apache.commons.configuration.tree.xpath

Examples of org.apache.commons.configuration.tree.xpath.XPathExpressionEngine

org.apache.commons.configuration.tree.xpath.XPathExpressionEngine
ns.apache.org/jxpath/"> Commons JXPath for handling XPath expressions and mapping them to the nodes of a hierarchical configuration. This makes the rich and powerfull XPATH syntax available for accessing properties from a configuration object.

For selecting properties arbitrary XPATH expressions can be used, which select single or multiple configuration nodes. The associated Configuration instance will directly pass the specified property keys into this engine. If a key is not syntactically correct, an exception will be thrown.

For adding new properties, this expression engine uses a specific syntax: the "key" of a new property must consist of two parts that are separated by whitespace:
1. An XPATH expression selecting a single node, to which the new element(s) are to be added. This can be an arbitrary complex expression, but it must select exactly one node, otherwise an exception will be thrown.
2. The name of the new element(s) to be added below this parent node. Here either a single node name or a complete path of nodes (separated by the "/" character) can be specified.
Some examples for valid keys that can be passed into the configuration's addProperty() method follow:
```
 "/tables/table[1] type" 
```
This will add a new type node as a child of the first table element.
```
 "/tables/table[1] @type" 
```
Similar to the example above, but this time a new attribute named type will be added to the first table element.
```
 "/tables table/fields/field/name" 
```
This example shows how a complex path can be added. Parent node is the tables element. Here a new branch consisting of the nodes table, fields, field, and name will be added.
@since 1.3 @author Oliver Heger @version $Id: XPathExpressionEngine.java 561230 2007-07-31 04:17:09Z rahul $

    try {
      xmlConfig.load(new StringReader(w.toString()));
    } catch (ConfigurationException e) {
      throw new JibeRuntimeException(e);
    }
    xmlConfig.setExpressionEngine(new XPathExpressionEngine());
    cc.setConfiguration(xmlConfig);
    return cc;
  }

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    NodeCombiner combiner = new UnionCombiner();
    CombinedConfiguration cc = new CombinedConfiguration(combiner);
    cc.addConfiguration(conf1);
    cc.addConfiguration(conf2);
    ConfigurationConfig combined = new ConfigurationConfig();
    cc.setExpressionEngine(new XPathExpressionEngine());
    combined.configuration = cc;
    return combined;
  }

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  private java.util.List<String> parseConfigFile() {
    java.util.List<String> values = new ArrayList();


    try {
      final XMLConfiguration initial = new XMLConfiguration(gui.getConfig().getProperty("genericconffile"));
      initial.setExpressionEngine(new XPathExpressionEngine());
      
      for (final HierarchicalConfiguration subconf : (java.util.List<HierarchicalConfiguration>)
          initial.configurationsAt("/generic/template")) {
        final String name = subconf.getString("name");
        if (name != null) values.add(name);

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  private Map<String, String> parseConfigFile(final String name) {
    Map<String, String> values = new HashMap();


    try {
      final XMLConfiguration initial = new XMLConfiguration(gui.getConfig().getProperty("genericconffile"));
      initial.setExpressionEngine(new XPathExpressionEngine());


      for (final HierarchicalConfiguration subconf : (java.util.List<HierarchicalConfiguration>)
          initial.configurationsAt("/generic/template")) {
        final String subconf_name = subconf.getString("name");
        if (subconf_name != null && subconf_name.equals(name)) {

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    public void testMerge() throws ConfigurationException
    {
        //combiner.setDebugStream(System.out);
        HierarchicalConfiguration config = createCombinedConfiguration();
        config.setExpressionEngine(new XPathExpressionEngine());
        assertEquals("Wrong number of Channels", 3, config.getMaxIndex("Channels/Channel"));
        assertEquals("Bad Channel 1 Name", "My Channel",
                config.getString("Channels/Channel[@id='1']/Name"));
        assertEquals("Bad Channel Type", "half",
                config.getString("Channels/Channel[@id='1']/@type"));

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    /**
     * Tests changing the expression engine.
     */
    public void testSetExpressionEngine()
    {
        parent.setExpressionEngine(new XPathExpressionEngine());
        setUpSubnodeConfig();
        assertEquals("Wrong field name", TABLE_FIELDS[0][1], config
                .getString("fields/field[2]/name"));
        Set keys = new HashSet();
        CollectionUtils.addAll(keys, config.getKeys());

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     * changed for the parent.
     */
    public void testParentChangeDetatchException()
    {
        config = parent.configurationAt("tables.table(1)", true);
        parent.setExpressionEngine(new XPathExpressionEngine());
        assertEquals("Wrong name of table", TABLE_NAMES[1], config
                .getString("name"));
        assertNull("Sub config was not detached", config.getSubnodeKey());
    }

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    private static final int LOOP_COUNT = 100;


    public void testConfiguration() throws Exception
    {
        DynamicCombinedConfiguration config = new DynamicCombinedConfiguration();
        XPathExpressionEngine engine = new XPathExpressionEngine();
        config.setExpressionEngine(engine);
        config.setKeyPattern(PATTERN);
        config.setDelimiterParsingDisabled(true);
        MultiFileHierarchicalConfiguration multi = new MultiFileHierarchicalConfiguration(PATTERN1);
        multi.setExpressionEngine(engine);

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        FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
        strategy.setRefreshDelay(10000);


        PatternSubtreeConfigurationWrapper config = new PatternSubtreeConfigurationWrapper(this.conf, PATTERN);
        config.setReloadingStrategy(strategy);
        config.setExpressionEngine(new XPathExpressionEngine());


        System.setProperty("Id", "1001");
        assertTrue(config.getInt("rowsPerPage") == 15);


        System.setProperty("Id", "1002");

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        assertEquals("a\\,b\\,c", conf2.getString("split.list4[@values]"));
        assertEquals("a,b,c", conf2.getString("split.list1"));
        assertEquals(0, conf2.getMaxIndex("split.list1"));
        assertEquals("a\\,b\\,c", conf2.getString("split.list2"));
        conf2 = new XMLConfiguration();
        conf2.setExpressionEngine(new XPathExpressionEngine());
        conf2.setDelimiterParsingDisabled(true);
        conf2.setFile(new File(testProperties));
        conf2.load();


        assertEquals("a,b,c", conf2.getString("split/list3/@values"));

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