Examples of 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 $
org.apache.commons.configuration2.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 powerful 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 {@code Configuration} instance will directly pass the specified property keysinto 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 or "@" for an attribute) can be specified.
Some examples for valid keys that can be passed into the configuration's {@code addProperty()} method follow:
```
 "/tables/table[1] type" 
```
This will add a new {@code type} node as a child of the first {@code table}element.
```
 "/tables/table[1] @type" 
```
Similar to the example above, but this time a new attribute named {@code type} will be added to the first {@code table} element.
```
 "/tables table/fields/field/name" 
```
This example shows how a complex path can be added. Parent node is the {@code tables} element. Here a new branch consisting of the nodes{@code table}, {@code fields}, {@code field}, and {@code name} will be added.
```
 "/tables table/fields/field@type" 
```
This is similar to the last example, but in this case a complex path ending with an attribute is defined.

Note: This extended syntax for adding properties only works with the {@code addProperty()} method. {@code setProperty()} does not supportcreating new nodes this way.

From version 1.7 on, it is possible to use regular keys in calls to {@code addProperty()} (i.e. keys that do not have to contain a whitespace asdelimiter). In this case the key is evaluated, and the biggest part pointing to an existing node is determined. The remaining part is then added as new path. As an example consider the key
```
 "tables/table[last()]/fields/field/name" 
```
If the key does not point to an existing node, the engine will check the paths {@code "tables/table[last()]/fields/field"}, {@code "tables/table[last()]/fields"}, {@code "tables/table[last()]"}, and so on, until a key is found which points to a node. Let's assume that the last key listed above can be resolved in this way. Then from this key the following key is derived: {@code "tables/table[last()] fields/field/name"} byappending the remaining part after a whitespace. This key can now be processed using the original algorithm. Keys of this form can also be used with the {@code setProperty()} method. However, it is still recommended touse the old format because it makes explicit at which position new nodes should be added. For keys without a whitespace delimiter there may be ambiguities.
@since 1.3 @version $Id: XPathExpressionEngine.java 1624601 2014-09-12 18:04:36Z oheger $

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


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

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

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

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

     */
    @Test
    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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Examples of org.apache.commons.configuration.tree.xpath.XPathExpressionEngine

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

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

     * is disabled
     */
    @Test
    public void testSaveWithDelimiterParsingDisabled() throws ConfigurationException {
        XMLConfiguration conf = new XMLConfiguration();
        conf.setExpressionEngine(new XPathExpressionEngine());
        conf.setDelimiterParsingDisabled(true);
        conf.setAttributeSplittingDisabled(true);
        conf.setFile(new File(testProperties));
        conf.load();


        assertEquals("a,b,c", conf.getString("split/list3/@values"));
        assertEquals(0, conf.getMaxIndex("split/list3/@values"));
        assertEquals("a\\,b\\,c", conf.getString("split/list4/@values"));
        assertEquals("a,b,c", conf.getString("split/list1"));
        assertEquals(0, conf.getMaxIndex("split/list1"));
        assertEquals("a\\,b\\,c", conf.getString("split/list2"));
        // save the configuration
        conf.save(testSaveConf.getAbsolutePath());


        // read the configuration and compare the properties
        XMLConfiguration checkConfig = new XMLConfiguration();
        checkConfig.setFileName(testSaveConf.getAbsolutePath());
        checkSavedConfig(checkConfig);
        XMLConfiguration config = new XMLConfiguration();
        config.setFileName(testFile2);
        //config.setExpressionEngine(new XPathExpressionEngine());
        config.setDelimiterParsingDisabled(true);
        config.setAttributeSplittingDisabled(true);
        config.load();
        config.setProperty("Employee[@attr1]", "3,2,1");
        assertEquals("3,2,1", config.getString("Employee[@attr1]"));
        config.save(testSaveFile.getAbsolutePath());
        config = new XMLConfiguration();
        config.setFileName(testSaveFile.getAbsolutePath());
        //config.setExpressionEngine(new XPathExpressionEngine());
        config.setDelimiterParsingDisabled(true);
        config.setAttributeSplittingDisabled(true);
        config.load();
        config.setProperty("Employee[@attr1]", "1,2,3");
        assertEquals("1,2,3", config.getString("Employee[@attr1]"));
        config.setProperty("Employee[@attr2]", "one, two, three");
        assertEquals("one, two, three", config.getString("Employee[@attr2]"));
        config.setProperty("Employee.text", "a,b,d");
        assertEquals("a,b,d", config.getString("Employee.text"));
        config.setProperty("Employee.Salary", "100,000");
        assertEquals("100,000", config.getString("Employee.Salary"));
        config.save(testSaveFile.getAbsolutePath());
        checkConfig = new XMLConfiguration();
        checkConfig.setFileName(testSaveFile.getAbsolutePath());
        checkConfig.setExpressionEngine(new XPathExpressionEngine());
        checkConfig.setDelimiterParsingDisabled(true);
        checkConfig.setAttributeSplittingDisabled(true);
        checkConfig.load();
        assertEquals("1,2,3", checkConfig.getString("Employee/@attr1"));
        assertEquals("one, two, three", checkConfig.getString("Employee/@attr2"));

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

     * Tests accessing properties when the XPATH expression engine is set.
     */
    @Test
    public void testXPathExpressionEngine()
    {
        conf.setExpressionEngine(new XPathExpressionEngine());
        assertEquals("Wrong attribute value", "foo\"bar", conf
                .getString("test[1]/entity/@name"));
        conf.clear();
        assertNull(conf.getString("test[1]/entity/@name"));
    }

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

    private CombinedConfiguration configuration; 


    public PreferenceServiceImpl()
    {
      configuration = new CombinedConfiguration(new UnionCombiner());
      configuration.setExpressionEngine(new XPathExpressionEngine());
    }

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Examples of org.apache.commons.configuration2.tree.xpath.XPathExpressionEngine

     * Tests changing the expression engine.
     */
    @Test
    public void testSetExpressionEngine()
    {
        parent.setExpressionEngine(new XPathExpressionEngine());
        setUpSubnodeConfig("tables/table[1]");
        assertEquals("Wrong field name", NodeStructureHelper.field(0, 1),
                config.getString("fields/field[2]/name"));
        Set<String> keys = ConfigurationAssert.keysToSet(config);
        assertEquals("Wrong number of keys", 2, keys.size());

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