org.mycore.services.fieldquery
Class MCRQueryParser

java.lang.Object
  org.mycore.parsers.bool.MCRBooleanClauseParser
      org.mycore.services.fieldquery.MCRQueryParser

public class MCRQueryParser
extends MCRBooleanClauseParser

Parses query conditions for use in MCRSearcher.

Author:

Frank Lützenkirchen

See Also:

MCRSearcher

Constructor Summary

MCRQueryParser()

Method Summary

(package private) static MCRCondition	normalizeCondition(MCRCondition cond) Normalizes a parsed query condition.
MCRCondition	parse(Element condition)
MCRCondition	parse(String s)
protected MCRCondition	parseSimpleCondition(Element e) Parses XML element containing a simple query condition
protected MCRCondition	parseSimpleCondition(String s) Parses a String containing a simple query condition, for example: (title contains "Java") and (creatorID = "122132131")
static boolean	validateQueryExpression(String query) Used for input validation in editor search form

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

defaultRule, main

Methods inherited from class java.lang.Object

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

Constructor Detail

MCRQueryParser

public MCRQueryParser()

Method Detail

parseSimpleCondition

protected MCRCondition parseSimpleCondition(Element e)
                                     throws MCRParseException

Parses XML element containing a simple query condition

Overrides:

parseSimpleCondition in class MCRBooleanClauseParser

Parameters:

e - the 'condition' element

Returns:

the parsed MCRQueryCondition object

Throws:

MCRParseException

parseSimpleCondition

protected MCRCondition 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

Parameters:

s - the condition as a String

Returns:

the parsed MCRQueryCondition object

Throws:

MCRParseException

parse

public MCRCondition parse(Element condition)
                   throws MCRParseException

Overrides:

parse in class MCRBooleanClauseParser

Throws:

MCRParseException

parse

public MCRCondition parse(String s)
                   throws MCRParseException

Overrides:

parse in class MCRBooleanClauseParser

Throws:

MCRParseException

normalizeCondition

static MCRCondition normalizeCondition(MCRCondition 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