org.basex.query
Class QueryProcessor

java.lang.Object
  org.basex.core.Progress
      org.basex.query.QueryProcessor

Direct Known Subclasses:

XPathProcessor, XQueryProcessor

public abstract class QueryProcessor
extends Progress

This abstract class contains various methods which allow querying in the database. A variety of hierarchical parsers (XPath, XQuery, etc..) can be implemented on top of this class.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Field Summary

java.lang.String

query Initial node set.

Constructor Summary

QueryProcessor(java.lang.String q)
Default Constructor.

Method Summary

void	compile(Nodes nodes) Compiles the query.
java.lang.String	det() Returns short information on this process.
java.lang.String	getInfo() Returns query background information.
void	parse() Parses the specified query.
double	prog() Returns progress information.
Result	query(Nodes n) Parses the specified query and returns the result.
Nodes	queryNodes(Nodes nodes) Parses the specified query and returns the result nodes.
java.lang.String	tit() Returns short information on this process.

Methods inherited from class org.basex.core.Progress

checkStop, detail, progress, progress, stop, title

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

query

public java.lang.String query

Initial node set.

Constructor Detail

QueryProcessor

public QueryProcessor(java.lang.String q)

Default Constructor.

Parameters:

q - query

Method Detail

parse

public void parse()
           throws QueryException

Parses the specified query.

Throws:

QueryException - query exception

compile

public final void compile(Nodes nodes)
                   throws QueryException

Compiles the query.

Parameters:

nodes - node context

Throws:

QueryException - query exception

queryNodes

public final Nodes queryNodes(Nodes nodes)
                       throws QueryException

Parses the specified query and returns the result nodes.

Parameters:

nodes - node context

Returns:

result of query

Throws:

QueryException - query exception

query

public final Result query(Nodes n)
                   throws QueryException

Parses the specified query and returns the result.

Parameters:

n - node context

Returns:

result of query

Throws:

QueryException - query exception

getInfo

public final java.lang.String getInfo()

Returns query background information.

Returns:

background information

tit

public final java.lang.String tit()

Description copied from class: Progress

Returns short information on this process. Can be overwritten to give more detailed information.

Returns:

header information

det

public final java.lang.String det()

Description copied from class: Progress

Returns short information on this process.

Overrides:

det in class Progress

Returns:

header information

prog

public final double prog()

Description copied from class: Progress

Returns progress information. Can be overwritten to give more detailed information.

Overrides:

prog in class Progress

Returns:

header information