org.basex.query
Class QueryProcessor

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

Direct Known Subclasses:

PFP, XPathProcessor, XQueryProcessor

public abstract class QueryProcessor
extends Progress

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

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen

Field Summary

byte[]

query Initial node set.

Constructor Summary

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

Method Summary

QueryContext	compile(Nodes nodes) Parses the specified query and writes the result to the specified output stream.
java.lang.String	det() Returns detailed information on this progress.
java.lang.String	getInfo() Returns query background information.
java.lang.String	head() Returns short information on this process.
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.

Methods inherited from class org.basex.core.Progress

detail, header, progress, progress, stop, stopped

Methods inherited from class java.lang.Object

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

Field Detail

query

public byte[] query

Initial node set.

Constructor Detail

QueryProcessor

public QueryProcessor(java.lang.String q)

Default Constructor.

Parameters:

q - query

Method Detail

compile

public final QueryContext compile(Nodes nodes)
                           throws QueryException

Parses the specified query and writes the result to the specified output stream.

Parameters:

nodes - node context

Returns:

query expression

Throws:

QueryException - query exception

det

public final java.lang.String det()

Description copied from class: Progress

Returns detailed information on this progress.

Returns:

information in detail

getInfo

public final java.lang.String getInfo()

Returns query background information.

Returns:

background information

head

public final java.lang.String head()

Description copied from class: Progress

Returns short information on this process.

Returns:

header information

prog

public final double prog()

Description copied from class: Progress

Returns progress information.

Returns:

header information

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

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