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C run-time support for ANTLR-generated parsers
Cassandra brings together the distributed systems technologies from Dynamo and the data model from Google's BigTable. Like Dynamo, Cassandra is eventually consistent. Like BigTable, Cassandra provides a ColumnFamily-based data model richer than typical key/value systems. For more information see http://cassandra.apache.org/
The scope of this package is to create a package of Java utility methods for accessing and modifying the properties of arbitrary JavaBeans. No dependencies outside of the JDK are required, so the use of this package is very lightweight.
A popular technique for organizing the execution of complex processing flows is the "Chain of Responsibility" pattern, as described (among many other places) in the classic "Gang of Four" design patterns book. Although the fundamental API contracts required to implement this design pattern are extremely simple, it is useful to have a base API that facilitates using the pattern, and (more importantly) encouraging composition of command implementations from multiple diverse sources. Towards that end, the Chain API models a computation as a series of "commands" that can be combined into a "chain". The API for a command consists of a single method (execute()), which is passed a "context" parameter containing the dynamic state of the computation, and whose return value is a boolean that determines whether or not processing for the current chain has been completed (true), or whether processing should be delegated to the next command in the chain (false).
The CLI library provides a simple and easy to use API for working with the command line arguments and options.
Commons Codec is an attempt to provide definitive implementations of commonly used encoders and decoders. Examples include Base64, Hex, Phonetic and URLs.
The introduction of the Collections API by Sun in JDK 1.2 has been a boon to quick and effective Java programming. Ready access to powerful data structures has accelerated development by reducing the need for custom container classes around each core object. Most Java2 APIs are significantly easier to use because of the Collections API. However, there are certain holes left unfilled by Sun's implementations, and the Jakarta-Commons Collections Component strives to fulfill them. Among the features of this package are: - special-purpose implementations of Lists and Maps for fast access - adapter classes from Java1-style containers (arrays, enumerations) to Java2-style collections. - methods to test or create typical set-theory properties of collections such as union, intersection, and closure.
Testframework for apache-commons-collections.
The Apache Commons Compress library defines an API for working with ar, cpio, Unix dump, tar, zip, gzip, XZ, Pack200 and bzip2 files.
Configuration is a project to provide a generic Configuration interface and allow the source of the values to vary. It provides easy typed access to single, as well as lists of configuration values based on a 'key'. Right now you can load properties from a simple properties file, a properties file in a jar, an XML file, JNDI settings, as well as use a mix of different sources using a ConfigurationFactory and CompositeConfiguration. Custom configuration objects are very easy to create now by just subclassing AbstractConfiguration. This works similar to how AbstractList works.