Package dev.roanh.gmark.lang.generic

Class GenericParser

java.lang.Object

dev.roanh.gmark.lang.generic.GenericParser

Direct Known Subclasses:

ParserCPQ, ParserRPQ

public abstract class GenericParser
extends Object

Class with generic query language parsing utilities.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GenericParser()	Hide constructor.

Method Summary

Modifier and Type	Method	Description
protected static Predicate	parsePredicate(String query, Map<String,Predicate> labels, char inverse)	Attempts to parse an (inverse) predicate/label from the given query string.
protected static List<String>	split(String str, char symbol)	Splits the given string into parts on the given character.

Methods inherited from class java.lang.Object

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

Constructor Details

GenericParser

protected GenericParser()

Hide constructor.

Method Details

split

protected static List<String> split(String str,
 char symbol)
                             throws IllegalArgumentException

Splits the given string into parts on the given character. The given character will not be returned in any parts and the found parts will be trimmed of leading and trailing whitespace. This method will ignore any regions of the input string that are enclosed in (nested) round brackets.

Parameters:

str - The string to split.

symbol - The character to split on.

Returns:

The input string split on the given character.

Throws:

IllegalArgumentException - When brackets are present in the given string, but not balanced properly.

parsePredicate

protected static Predicate parsePredicate(String query,
 Map<String,Predicate> labels,
 char inverse)
                                   throws IllegalArgumentException

Attempts to parse an (inverse) predicate/label from the given query string.

Parameters:

query - The query string to parse.

labels - The set of predicates encountered so far. Used to reuse existing labels and to register newly detected predicates.

inverse - The symbol used to denote inverse labels.

Returns:

The predicate that was parsed.

Throws:

IllegalArgumentException - When the given query string does not represent a valid predicate.