See: Description
| Class | Description |
|---|---|
| QueryParserHelper |
This class is a helper for the query parser framework, it does all the three
query parser phrases at once: text parsing, query processing and query
building.
|
| Exception | Description |
|---|---|
| QueryNodeException |
This exception should be thrown if something wrong happens when dealing with
QueryNodes. |
| QueryNodeParseException |
This should be thrown when an exception happens during the query parsing from
string to the query node tree.
|
| Error | Description |
|---|---|
| QueryNodeError |
Error class with NLS support
|
This package contains the necessary classes to implement a query parser.
A query parser is divided in at least 2 phases, text parsing and query building, and one optional phase called query processing.
The text parsing phase is performed by a text parser, which implements SyntaxParser interface.
A text parser is responsible to get a query string and convert it to a QueryNode tree,
which is an object structure that represents the elements defined in the query string.
The query processing phase is performed by a query processor, which implements QueryNodeProcessor.
A query processor is responsible to perform any processing on a QueryNode tree. This phase
is optional and is used only if an extra processing, validation, query expansion, etc needs to be performed in a QueryNode tree.
The QueryNode tree can be either be generated by a text parser or programmatically created.
The query building phase is performed by a query builder, which implements QueryBuilder.
A query builder is responsible to convert a QueryNode tree into an arbitrary object, which
is usually used to be executed against a search index.