Running Lucene Search on WebLogic Portal 8.1

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Tutorial: Running Lucene Search on WebLogic Portal 8.1

Lucene comes with two main services available: indexing and searching. The indexing tasks are done independently from the search tasks. Both the index and search services are available so that developers can extend them to meet their needs.

Tutorial Details:

Both the index and search services are available so that developers can extend them to meet their needs. Lucene is written in 100% Java with emphasis on performance.

Text indexing is the area of Lucene focused on building a searchable index. The index works as a repository created for high performance content queries. Lucene exposes a rich API to interact with the information stored in the index. You can manage the index to be as basic as listing the document name and its abstract or as rich as storing the full document and additional related metadata about that document. For example, the additional metadata could be ranking information, so that certain documents would show higher than others in the search results.

Text searching creates a query that contains a collection of terms that the user is looking for in the index. The index repository is built for high speed look ups and the results can be returned with relevancy ranking. Lucene supports several types of searches that are common in the industry. Some of the main search types are listed below:
Wildcard: Lucene supports single or multiple wildcard searches
Fuzzy: Fuzzy searches are based on the Levenshtein Distance, or Edit Distance algorithm.
Proximity: Lucene supports finding words are a within a specific distance away.
Ranging: Range queries allow one to match documents whose field values are between the lower and upper bound specified by the range query.
Boosting a term: Lucene provides the relevance level of matching documents based on the terms found.
Boolean operators: Boolean operators allow terms to be combined through logic operators. Lucene supports AND, "+", OR, NOT and "-" as Boolean operators.

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