Package hydra.ext.gql

Class GQLReader

java.lang.Object

hydra.tools.MapperBase

hydra.tools.AntlrReaderBase

hydra.ext.gql.GQLReader

public class GQLReader
extends AntlrReaderBase

A parser for GQL (Graph Query Language) queries. Uses ANTLR to parse GQL syntax and detect syntax errors.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GQLReader.GQLSyntaxError	Exception thrown when GQL syntax errors are encountered during parsing.

Nested classes/interfaces inherited from class hydra.tools.MapperBase

MapperBase.MapperException

Constructor Summary

Constructors

Constructor	Description
GQLReader()

Method Summary

Modifier and Type	Method	Description
static boolean	isValidGqlQuery(String query)	Check if a GQL query string is syntactically valid.
static Object	read(String query)	Parse a GQL query string.
static Maybe<String>	tryQuery(String query)	Try to parse a GQL query and return an error message if parsing fails.

Methods inherited from class hydra.tools.AntlrReaderBase

match

Methods inherited from class hydra.tools.MapperBase

invalid, invalidEmptyList, invalidMissingField, invalidUnexpectedNull, list, map, matchCase, matchCase, nonemptyList, oneOrMany, optional, optional, required, required, unsupported, unsupported

Methods inherited from class java.lang.Object

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

Constructor Details

GQLReader

public GQLReader()

Method Details

read

public static Object read(String query)

Parse a GQL query string.

Parameters:

query - the GQL query string to parse

Returns:

the parsed result (currently returns a placeholder Object)

isValidGqlQuery

public static boolean isValidGqlQuery(String query)

Check if a GQL query string is syntactically valid.

Parameters:

query - the GQL query string to validate

Returns:

true if the query is valid, false otherwise

tryQuery

public static Maybe<String> tryQuery(String query)

Try to parse a GQL query and return an error message if parsing fails.

Parameters:

query - the GQL query string to parse

Returns:

an optional error message (empty if parsing succeeds)