Package org.apache.jackrabbit.oak.query.xpath

Class XPathToSQL2Converter

java.lang.Object

org.apache.jackrabbit.oak.query.xpath.XPathToSQL2Converter

public class XPathToSQL2Converter
extends Object

This class can can convert a XPATH query to a SQL2 query.

Field Summary

Fields

Modifier and Type	Field	Description
static final boolean	NODETYPE_OPTIMIZATION	Optimize queries of the form "from [nt:base] where [jcr:primaryType] = 'x'" to "from [x] where [jcr:primaryType] = 'x'".
static final boolean	NODETYPE_UNION	Convert queries of the form "where [jcr:primaryType] = 'x' or [jcr:primaryType] = 'y'" to "select ...

Constructor Summary

Constructors

Constructor	Description
XPathToSQL2Converter()
XPathToSQL2Converter(QueryEngineSettings settings)

Method Summary

Modifier and Type	Method	Description
String	convert(String query)	Convert the query to SQL2.

Methods inherited from class java.lang.Object

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

Field Details

NODETYPE_OPTIMIZATION

public static final boolean NODETYPE_OPTIMIZATION

Optimize queries of the form "from [nt:base] where [jcr:primaryType] = 'x'" to "from [x] where [jcr:primaryType] = 'x'". Enabled by default.

NODETYPE_UNION

public static final boolean NODETYPE_UNION

Convert queries of the form "where [jcr:primaryType] = 'x' or [jcr:primaryType] = 'y'" to "select ... where [jcr:primaryType] = 'x' union select ... where [jcr:primaryType] = 'y'". If disabled, only one query with "where [jcr:primaryType] in ('x', 'y') is used. Enabled by default.

Constructor Details

XPathToSQL2Converter

public XPathToSQL2Converter()

XPathToSQL2Converter

public XPathToSQL2Converter(QueryEngineSettings settings)

Method Details

convert

public String convert(String query)
               throws ParseException

Convert the query to SQL2.

Parameters:

query - the query string

Returns:

the SQL2 query

Throws:

ParseException - if parsing fails