Examples of org.apache.commons.configuration2.builder.fluent.Configurations

Package org.apache.commons.configuration2.builder.fluent

Examples of org.apache.commons.configuration2.builder.fluent.Configurations

org.apache.commons.configuration2.tree.ImmutableNode
A convenience class which simplifies the creation of standard configurations and their builders.

Complex initializations of configuration builders can be done in a pretty straight-forward way by making use of the provided fluent API. However, if only default settings are used (and maybe a configuration file to be loaded has to be specified), this approach tends to become a bit verbose. This class was introduced to simplify the creation of configuration objects in such cases. It offers a bunch of methods which allow the creation of some standard configuration classes with default settings passing in only a minimum required parameters.

An an example consider the creation of a {@code PropertiesConfiguration}object from a file. Using a builder, code like the following one would have to be written:
```
 Parameters params = new Parameters(); FileBasedConfigurationBuilder<PropertiesConfiguration> builder = new FileBasedConfigurationBuilder<PropertiesConfiguration>( PropertiesConfiguration.class).configure(params.fileBased() .setFile(new File("config.properties"))); PropertiesConfiguration config = builder.getConfiguration(); 
```
With a convenience method of {@code Configurations} the same can be achievedwith the following:
```
 Configurations configurations = new Configurations(); PropertiesConfiguration config = configurations.properties(new File( "config.properties")); 
```
There are similar methods for constructing builder objects from which configurations can then be obtained.

This class is thread-safe. A single instance can be created by an application and used in a central way to create configuration objects. When an instance is created a {@link Parameters} instance can be passed in. Otherwise, adefault instance is created. In any case, the {@code Parameters} instanceassociated with a {@code Configurations} object can be used to define defaultsettings for the configurations to be created.
@version $Id: Configurations.java 1624601 2014-09-12 18:04:36Z oheger $ @since 2.0 @see org.apache.commons.configuration2.builder.DefaultParametersManager

     *
     * @return the new key object
     */
    private static DefaultConfigurationKey createConfigurationKey()
    {
        return new DefaultConfigurationKey(DefaultExpressionEngine.INSTANCE);
    }

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        assertTrue(prop instanceof Collection);
        assertEquals(5, ((Collection<?>) prop).size());


        for (int i = 0; i < NodeStructureHelper.fieldsLength(0); i++)
        {
            DefaultConfigurationKey key = createConfigurationKey();
            key.append("fields").append("field").appendIndex(i);
            key.append("name");
            assertEquals(NodeStructureHelper.field(0, i), subset.getProperty(key.toString()));
        }


        // test the subset on the second table
        assertTrue("subset is not empty", config.subset("tables.table(2)").isEmpty());

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            {
                return null;
            }


            Collection<String> result = new ArrayList<String>();
            DefaultConfigurationKey.KeyIterator it = new DefaultConfigurationKey(
                    AT_ENGINE, at).iterator();
            while (it.hasNext())
            {
                result.add(it.nextKey());
            }

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    public void process(Configuration config)
    {
        if (config != null)
        {
            DefaultExpressionEngine exprEngine = DefaultExpressionEngine.INSTANCE;
            DefaultConfigurationKey keyEmpty =
                    new DefaultConfigurationKey(exprEngine);
            DefaultConfigurationKey keyLast = keyEmpty;
            Set<String> keySet = new HashSet<String>();


            for (Iterator<String> it = config.getKeys(); it.hasNext();)
            {
                String key = it.next();
                if (keySet.contains(key))
                {
                    // this key has already been processed by openElements
                    continue;
                }
                DefaultConfigurationKey keyAct =
                        new DefaultConfigurationKey(exprEngine, key);
                closeElements(keyLast, keyAct);
                String elem = openElements(keyLast, keyAct, config, keySet);
                fireValue(elem, config.getProperty(key));
                keyLast = keyAct;
            }

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     * @param keyLast the last processed key
     * @param keyAct the actual key
     */
    protected void closeElements(DefaultConfigurationKey keyLast, DefaultConfigurationKey keyAct)
    {
        DefaultConfigurationKey keyDiff = keyAct.differenceKey(keyLast);
        Iterator<String> it = reverseIterator(keyDiff);
        if (it.hasNext())
        {
            // Skip first because it has already been closed by fireValue()
            it.next();

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     */
    protected String openElements(DefaultConfigurationKey keyLast, DefaultConfigurationKey keyAct,
            Configuration config, Set<String> keySet)
    {
        DefaultConfigurationKey.KeyIterator it = keyLast.differenceKey(keyAct).iterator();
        DefaultConfigurationKey k = keyLast.commonKey(keyAct);
        for (it.nextKey(); it.hasNext(); it.nextKey())
        {
            k.append(it.currentKey(true));
            elementStart(it.currentKey(true), config.getProperty(k.toString()));
            keySet.add(k.toString());
        }
        return it.currentKey(true);
    }

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     */
    public void process(Configuration config)
    {
        if (config != null)
        {
            DefaultExpressionEngine exprEngine = DefaultExpressionEngine.INSTANCE;
            DefaultConfigurationKey keyEmpty =
                    new DefaultConfigurationKey(exprEngine);
            DefaultConfigurationKey keyLast = keyEmpty;
            Set<String> keySet = new HashSet<String>();

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    {
        PropertiesConfiguration child = new PropertiesConfiguration();
        child.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
        child.addProperty("test(a)", "1,2,3");
        config.addConfiguration(child);
        DefaultExpressionEngine engineQuery =
                new DefaultExpressionEngine(
                        new DefaultExpressionEngineSymbols.Builder(
                                DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS)
                                .setIndexStart("<").setIndexEnd(">").create());
        config.setExpressionEngine(engineQuery);
        DefaultExpressionEngine engineConvert =
                new DefaultExpressionEngine(
                        new DefaultExpressionEngineSymbols.Builder(
                                DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS)
                                .setIndexStart("[").setIndexEnd("]").create());
        config.setConversionExpressionEngine(engineConvert);
        assertEquals("Wrong property 1", "1", config.getString("test(a)<0>"));

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     */
    @Test
    public void testSetConversionExpressionEngineSynchronized()
    {
        SynchronizerTestImpl sync = setUpSynchronizerTest();
        config.setConversionExpressionEngine(new DefaultExpressionEngine(
                DefaultExpressionEngineSymbols.DEFAULT_SYMBOLS));
        sync.verify(Methods.BEGIN_WRITE, Methods.END_WRITE);
        checkCombinedRootNotConstructed();
    }

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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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