Utility Classes

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An XML parser is required to read XML files. Various frameworks exist that allow reading and saving of XML files. However, accessing the individual elements is often solved tediously using object trees.

JVx contains the classes XmlWorker and XmlNode which allow direct access to tags. In addition, attributes can be accessed like sub tags. Performance and memory use are also very low.

In the following example we read an XML file, change a Sub Tag and save the result as a new XML file:

XmlWorker xmw = new XmlWorker();
 
XmlNode xmnRead = xmw.read(new FileInputStream("example.xml"));
 
xmnRead.setNode("/archive/element(1)/user", "xml");
 
xmw.write(new FileOutputStream("example_v2.xml"), xmnRead);

More Details about XML Handling.

Array operations are always tedious coding work, and every developer could easily do without it. Removing a single element from an array is not rocket science, but there is no standard function available for this task. And who would not like to search an array for an element without coding a loop?

With ArrayUtil significant array operations were implemented, which also fully include the list interface. We gain performance compared to standard lists as an added benefit.

From time to time objects have to be cached and exchanged between various instances. Parameters and public methods are very useful for this purpose, but we do not always want to pass an object on across countless instances to the target. Also, the required objects are not always located in the same scope.

This is what the ObjectCacheis for, which handles objects statically, for certain time periods or permanently, within a VM.

This can be compared to a static hash table, complement by a timeout.

The Standard Hashtable manages its keys in an undefined order. Sometimes it can be useful to keep the order in which the data was added.

This is handled by the OrderedHashtable.

The Standard Hashtable manages exactly one value per key. However, often more than one value per key has to be stored. In this case a list has to be used as a value, in which a number of individual values are saved. This is not particularly difficult, but a tedious and boring task.

The KeyValueList handles the administration of lists and leaves the developer time for more important tasks.

The Reflective class allows you to create class instances or call methods via reflection but without directly using java.lang.reflect.

More details, see here.

There are many other interesting utility classes, such as StringUtil, BeanUtil, DateUtil, FileUtil, ImageUtil, …

Additional information can be found in javadoc.