Package org.mycore.services.fieldquery

Class MCRQueryParser

java.lang.Object

org.mycore.parsers.bool.MCRBooleanClauseParser<Void>

org.mycore.services.fieldquery.MCRQueryParser

public class MCRQueryParser
extends MCRBooleanClauseParser<Void>

Parses query conditions for use in MCRSearcher.

Author:

Frank Lützenkirchen

Constructor Summary

Constructors

Constructor	Description
MCRQueryParser()

Method Summary

Modifier and Type	Method	Description
static MCRCondition<Void>	normalizeCondition(MCRCondition<Void> cond)	Normalizes a parsed query condition.
MCRCondition<Void>	parse(String s)	Parse a complex or simple condition in String format and put it in an condition object.
MCRCondition<Void>	parse(Element condition)	Parse a complex or simple condition in XML format and put it in an condition object.
protected MCRCondition<Void>	parseSimpleCondition(String s)	Parses a String containing a simple query condition, for example: (title contains "Java") and (creatorID = "122132131")
protected MCRCondition<Void>	parseSimpleCondition(Element e)	Parses XML element containing a simple query condition
static boolean	validateQueryExpression(String query)	Used for input validation in editor search form

Methods inherited from class org.mycore.parsers.bool.MCRBooleanClauseParser

defaultRule

Methods inherited from class java.lang.Object

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

Constructor Details

MCRQueryParser

public MCRQueryParser()

Method Details

parseSimpleCondition

protected MCRCondition<Void> parseSimpleCondition(Element e)
                                           throws MCRParseException

Parses XML element containing a simple query condition

Overrides:

parseSimpleCondition in class MCRBooleanClauseParser<Void>

Parameters:

e - the 'condition' element

Returns:

the parsed MCRQueryCondition object

Throws:

MCRParseException

parseSimpleCondition

protected MCRCondition<Void> parseSimpleCondition(String s)
                                           throws MCRParseException

Parses a String containing a simple query condition, for example: (title contains "Java") and (creatorID = "122132131")

Overrides:

parseSimpleCondition in class MCRBooleanClauseParser<Void>

Parameters:

s - the condition as a String

Returns:

the parsed MCRQueryCondition object

Throws:

MCRParseException

parse

public MCRCondition<Void> parse(Element condition)
                         throws MCRParseException

Description copied from class: MCRBooleanClauseParser

Parse a complex or simple condition in XML format and put it in an condition object.

Overrides:

parse in class MCRBooleanClauseParser<Void>

Parameters:

condition - a MyCoRe condition object in XML format

Returns:

a MyCoRe condition object in the MCRCondition format

Throws:

MCRParseException

parse

public MCRCondition<Void> parse(String s)
                         throws MCRParseException

Description copied from class: MCRBooleanClauseParser

Parse a complex or simple condition in String format and put it in an condition object.

Overrides:

parse in class MCRBooleanClauseParser<Void>

Parameters:

s - a MyCoRe condition object in String format

Returns:

a MyCoRe condition object in the MCRCondition format

Throws:

MCRParseException

normalizeCondition

public static MCRCondition<Void> normalizeCondition(MCRCondition<Void> cond)

Normalizes a parsed query condition. AND/OR conditions that just have one child will be replaced with that child. NOT(NOT(X)) will be normalized to X. (A AND (b AND c)) will be normalized to (A AND B AND C), same for nested ORs. AND/OR/NOT conditions with no child conditions will be removed. Conditions that use the operator "contains" will be splitted into multiple simpler conditions if the condition value contains phrases surrounded by '...' or wildcard search with * or ?.

validateQueryExpression

public static boolean validateQueryExpression(String query)

Used for input validation in editor search form