Examples of org.apache.commons.configuration2.tree.ExpressionEngine

Package org.apache.commons.configuration2.tree

Examples of org.apache.commons.configuration2.tree.ExpressionEngine

org.apache.commons.configuration2.tree.ImmutableNode

Definition of an interface for evaluating keys for hierarchical configurations.

An expression engine knows how to map a key for a configuration's property to a single or a set of configuration nodes. Thus it defines the way how properties are addressed in this configuration. Methods of a configuration that have to handle property keys (e.g. {@code getProperty()}or {@code addProperty()} do not interpret the passed in keys on their own,but delegate this task to an associated expression engine. This expression engine will then find out, which configuration nodes are addressed by the key.

Separating the task of evaluating property keys from the configuration object has the advantage that multiple different expression languages (i.e. ways for querying or setting properties) can be supported. Just set a suitable implementation of this interface as the configuration's expression engine, and you can use the syntax provided by this implementation.

An {@code ExpressionEngine} can deal with nodes of different types. Toachieve this, a {@link NodeHandler} for the desired type must be passed tothe methods.
@since 1.3 @version $Id: ExpressionEngine.java 1624601 2014-09-12 18:04:36Z oheger $

     */
    @Test
    public void testConvertHierarchicalToHierarchicalEngine()
    {
        BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
        ExpressionEngine engine =
                new DefaultExpressionEngine(
                        DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
        assertSame("Created new configuration", hc, ConfigurationUtils
                .convertToHierarchical(hc, engine));
        assertSame("Engine was not set", engine, hc.getExpressionEngine());

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     */
    @Test
    public void testConvertHierarchicalToHierarchicalNullEngine()
    {
        BaseHierarchicalConfiguration hc = new BaseHierarchicalConfiguration();
        ExpressionEngine engine =
                new DefaultExpressionEngine(
                        DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS);
        hc.setExpressionEngine(engine);
        assertSame("Created new configuration", hc, ConfigurationUtils
                .convertToHierarchical(hc, null));

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     * and whether they are called in the correct order.
     */
    @Test
    public void testApplyDefaultsMultipleHandlers()
    {
        final ExpressionEngine engine =
                EasyMock.createMock(ExpressionEngine.class);
        manager.registerDefaultsHandler(XMLBuilderParameters.class,
                new DefaultParametersHandler<XMLBuilderParameters>()
                {
                    @Override

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     * created.
     */
    @Test
    public void testHierarchical()
    {
        ExpressionEngine engine = EasyMock.createMock(ExpressionEngine.class);
        Map<String, Object> map =
                new Parameters().hierarchical().setThrowExceptionOnMissing(true)
                        .setExpressionEngine(engine).setFileName("test.xml")
                        .setListDelimiterHandler(listHandler).getParameters();
        checkBasicProperties(map);

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     * created.
     */
    @Test
    public void testXml()
    {
        ExpressionEngine engine = EasyMock.createMock(ExpressionEngine.class);
        Map<String, Object> map =
                new Parameters().xml().setThrowExceptionOnMissing(true)
                        .setFileName("test.xml").setValidating(true)
                        .setExpressionEngine(engine).setListDelimiterHandler(listHandler)
                        .setSchemaValidation(true).getParameters();

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                FileBasedBuilderParameters.class.isInstance(params));
        FileBasedBuilderParameters fbParams =
                (FileBasedBuilderParameters) params;
        fbParams.setListDelimiterHandler(listHandler).setFileName("test.xml")
                .setThrowExceptionOnMissing(true);
        ExpressionEngine engine = EasyMock.createMock(ExpressionEngine.class);
        ((HierarchicalBuilderParameters) params).setExpressionEngine(engine);
        Map<String, Object> map = fbParams.getParameters();
        checkBasicProperties(map);
        assertSame("Wrong expression engine", engine, map.get("expressionEngine"));
    }

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     * exceptions.
     */
    @Test(expected = ConfigurationRuntimeException.class)
    public void testInitializeDefaultsException()
    {
        ExpressionEngine engine = EasyMock.createMock(ExpressionEngine.class);
        XMLBuilderParametersImpl source = new XMLBuilderParametersImpl();
        source.setExpressionEngine(engine);
        XMLBuilderParametersImpl dest = new XMLBuilderParametersImpl()
        {
            @Override

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            throws ConfigurationException
    {
        MultiFileConfigurationBuilder<XMLConfiguration> builder =
                new MultiFileConfigurationBuilder<XMLConfiguration>(
                        XMLConfiguration.class);
        ExpressionEngine engine = new XPathExpressionEngine();
        BuilderParameters xmlParams =
                new XMLBuilderParametersImpl().setExpressionEngine(engine)
                        .setListDelimiterHandler(
                                new DefaultListDelimiterHandler(';'));
        MultiFileBuilderParametersImpl params =

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     * super class.
     */
    @Test
    public void testInitWithParameters() throws ConfigurationException
    {
        ExpressionEngine engine = new XPathExpressionEngine();
        BasicBuilderParameters params =
                createTestBuilderParameters(new XMLBuilderParametersImpl()
                        .setExpressionEngine(engine));
        ReloadingMultiFileConfigurationBuilder<XMLConfiguration> builder =
                new ReloadingMultiFileConfigurationBuilder<XMLConfiguration>(

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        BufferedReader bufferedReader = new BufferedReader(in);
        Map<String, ImmutableNode.Builder> sectionBuilders = new LinkedHashMap<String, ImmutableNode.Builder>();
        ImmutableNode.Builder rootBuilder = new ImmutableNode.Builder();


        createNodeBuilders(bufferedReader, rootBuilder, sectionBuilders);
        ImmutableNode rootNode = createNewRootNode(rootBuilder, sectionBuilders);
        addNodes(null, rootNode.getChildren());
    }

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