olap4j is an open Java API for OLAP.

See: Description

Packages 
Package Description
org.olap4j
Provides the core classes and interfaces of the olap4j API for accessing and processing OLAP data.
org.olap4j.driver.xmla
olap4j to XML for Analysis bridge.
org.olap4j.driver.xmla.cache
Provides SOAP caching functionality.
org.olap4j.driver.xmla.proxy
Provides proxy communications with XML/A servers.
org.olap4j.layout
Provides utility classes to display and render olap4j specific data structures.
org.olap4j.mdx
Provides an object model to represent statements and expressions in the MDX lanaugage as a parse tree.
org.olap4j.mdx.parser
Provides an API for parsing statements and expressions in the MDX language.
org.olap4j.metadata
Provides classes and interfaces for browsing an OLAP schema.
org.olap4j.query
Provides an object model for building OLAP queries programmatically (experimental).
org.olap4j.transform
Provides services to transform MDX parse trees (experimental).
org.olap4j.type
Type system for MDX expressions.
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