Examples of org.apache.commons.configuration.tree.DefaultConfigurationKey

Package org.apache.commons.configuration.tree

Examples of org.apache.commons.configuration.tree.DefaultConfigurationKey

org.apache.commons.configuration.tree.DefaultConfigurationKey

A simple class that supports creation of and iteration on configuration keys supported by a {@link DefaultExpressionEngine} object.

For key creation the class works similar to a StringBuffer: There are several appendXXXX() methods with which single parts of a key can be constructed. All these methods return a reference to the actual object so they can be written in a chain. When using this methods the exact syntax for keys need not be known.

This class also defines a specialized iterator for configuration keys. With such an iterator a key can be tokenized into its single parts. For each part it can be checked whether it has an associated index.

Instances of this class are always associated with an instance of {@link DefaultExpressionEngine}, from which the current delimiters are obtained. So key creation and parsing is specific to this associated expression engine.
@since 1.3 @author Oliver Heger @version $Id: DefaultConfigurationKey.java 1158891 2011-08-17 20:08:39Z oheger $

            {
                return null;
            }


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

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            {
                return null;
            }


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

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            {
                return null;
            }


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

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            {
                return null;
            }


            Collection result = new ArrayList();
            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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            {
                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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            {
                return null;
            }


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

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        config.addProperty("connection.user", "scott");
        config.addProperty("connection.passwd", "tiger");
        assertEquals("tiger", config.getProperty("connection.passwd"));


        DefaultConfigurationKey key = createConfigurationKey();
        key.append("tables").append("table").appendIndex(0);
        key.appendAttribute("tableType");
        config.addProperty(key.toString(), "system");
        assertEquals("system", config.getProperty(key.toString()));
    }

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