Examples of org.apache.commons.collections.ExtendedProperties

org.apache.commons.collections.ExtendedProperties
This class extends normal Java properties by adding the possibility to use the same key many times concatenating the value strings instead of overwriting them.
The Extended Properties syntax is explained here:
- Each property has the syntax key = value
- The key may use any character but the equal sign '='.
- value may be separated on different lines if a backslash is placed at the end of the line that continues below.
- If value is a list of strings, each token is separated by a comma ','.
- Commas in each token are escaped placing a backslash right before the comma.
- If a key is used more than once, the values are appended like if they were on the same line separated with commas.
- Blank lines and lines starting with character '#' are skipped.
- If a property is named "include" (or whatever is defined by setInclude() and getInclude() and the value of that property is the full path to a file on disk, that file will be included into the ConfigurationsRepository. You can also pull in files relative to the parent configuration file. So if you have something like the following: include = additional.properties Then "additional.properties" is expected to be in the same directory as the parent configuration file. Duplicate name values will be replaced, so be careful.
Here is an example of a valid extended properties file:
```
 # lines starting with # are comments # This is the simplest property key = value # A long property may be separated on multiple lines longvalue = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa # This is a property with many tokens tokens_on_a_line = first token, second token # This sequence generates exactly the same result tokens_on_multiple_lines = first token tokens_on_multiple_lines = second token # commas may be escaped in tokens commas.excaped = Hi\, what'up? 
```
NOTE: this class has not been written for performance nor low memory usage. In fact, it's way slower than it could be and generates too much memory garbage. But since performance is not an issue during intialization (and there is not much time to improve it), I wrote it this way. If you don't like it, go ahead and tune it up! @author Stefano Mazzocchi @author Jon S. Stevens @author Dave Bryson @author Jason van Zyl @author Geir Magnusson Jr. @author Leon Messerschmidt @author Kent Johnson @author Daniel Rall @author Ilkka Priha @version $Id: ExtendedProperties.java,v 1.4 2001/05/13 21:46:22 geirm Exp $

     * @param configurationFile
     * @throws Exception When an error occurs during initialization.
     */
    public void init(String configurationFile)
        throws Exception {
        overridingProperties = new ExtendedProperties(configurationFile);
        init();
    }

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     * 
     * @param input the InputStream to read from
     */
    public void read(InputStream input) throws IOException
    {
        ExtendedProperties props = new ExtendedProperties();
        props.load(input);


        // all factory settings should be prefixed with "tools"
        read(props.subset("tools"));
    }

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    protected void readProperties(ExtendedProperties configProps,
                                  Configuration config)
    {
        ExtendedProperties properties = configProps.subset("property");
        for (Iterator i = properties.getKeys(); i.hasNext(); )
        {
            String name = (String)i.next();
            String value = properties.getString(name);


            ExtendedProperties propProps = properties.subset(name);
            if (propProps.isEmpty())
            {
                // then set this as a 'simple' property
                config.setProperty(name, value);
            }
            else

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        {
            ToolboxConfiguration toolbox = new ToolboxConfiguration();
            toolbox.setScope(scope);
            addToolbox(toolbox);


            ExtendedProperties toolboxProps = factory.subset(scope);
            readTools(toolboxProps, toolbox);
            readProperties(toolboxProps, toolbox);
        }
    }

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            tool.setKey(key);
            tool.setClassname(classname);
            toolbox.addTool(tool);


            // get tool properties prefixed by 'property'
            ExtendedProperties toolProps = tools.subset(key);
            readProperties(toolProps, tool);


            // ok, get tool properties that aren't prefixed by 'property'
            for (Iterator j = toolProps.getKeys(); j.hasNext(); )
            {
                String name = (String)j.next();
                tool.setProperty(name, toolProps.getString(name));
            }


            // get special props explicitly
            String restrictTo = toolProps.getString("restrictTo");
            tool.setRestrictTo(restrictTo);
        }
    }

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            Data data = new Data();
            data.setKey(key);
            data.setValue(dataset.getString(key));


            // get/set the type/converter properties
            ExtendedProperties props = dataset.subset(key);
            setProperties(props, data);
        }
    }

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        }


        // this will throw an exception if require is true and there
        // are no properties at the path.  if require is false, this
        // will return null when there's no properties at the path
        ExtendedProperties props = getProperties(path, require);
        if (props == null)
        {
            return false;
        }

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        if (inputStream == null)
        {
            return null;
        }


        ExtendedProperties properties = new ExtendedProperties();
        try
        {
            properties.load(inputStream);
        }
        catch (IOException ioe)
        {
            String msg = "Failed to load properties at: "+path;
            getLog().error(msg, ioe);

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 */
public class TestConfigurationConverter extends TestCase
{
    public void testExtendedPropertiesToConfiguration()
    {
        ExtendedProperties eprops = new ExtendedProperties();
        eprops.setProperty("string", "teststring");
        eprops.setProperty("int", "123");
        eprops.addProperty("list", "item 1");
        eprops.addProperty("list", "item 2");


        Configuration config = ConfigurationConverter.getConfiguration(eprops);


        assertEquals("This returns 'teststring'", "teststring", config.getString("string"));
        List item1 = config.getList("list");

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        config.setProperty("string", "teststring");
        config.setProperty("int", "123");
        config.addProperty("list", "item 1");
        config.addProperty("list", "item 2");


        ExtendedProperties eprops = ConfigurationConverter.getExtendedProperties(config);


        assertEquals("This returns 'teststring'", "teststring", eprops.getString("string"));
        List list = eprops.getVector("list");
        assertEquals("This returns 'item 1'", "item 1", (String) list.get(0));
        assertEquals("This returns 123", 123, eprops.getInt("int"));
    }

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