Package fr.mines_stetienne.ci.sparql_generate.json

Class ITER_JSONPath

java.lang.Object

fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase

fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase

fr.mines_stetienne.ci.sparql_generate.json.ITER_JSONPath

All Implemented Interfaces:

IteratorFunction

public class ITER_JSONPath
extends IteratorFunctionBase

Iterator function iter:JSONPath extracts a list of sub-JSON documents of a JSON document, according to a JSONPath expression. See https://github.com/json-path/JsonPath for the JSONPath syntax specification.

See Live example

• Param 1: (json): the URI of the JSON document (a URI), or the JSON object itself (a String);
• Param 2: (jsonPath) the JSONPath query;
• Param 3 .. N : (auxJsonPath ... ) other JSONPath queries, which will be executed over the results of the execution of jsonPath, and provide one result each.

The following variables may be bound:

• Output 1: (string) sub-JSON document, encoded in a string literal;
• Output 2 .. N-1: result of the execution of the auxiliary JsonPath queries on Output 1, encoded as a boolean, float, double, integer, string, as it best fits;
• Output N: (integer) the position of the result in the list;
• Output N+1: (boolean) true if this result has a next result in the list.

Output 2 and 3 can be used to generate RDF lists from the input, but the use of keyword LIST( ?var ) as the object of a triple pattern covers most cases more elegantly.

Author:

Maxime Lefrançois

Field Summary

Fields

Modifier and Type	Field	Description
static String	URI

Fields inherited from class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase

arguments

Constructor Summary

Constructors

Constructor	Description
ITER_JSONPath()

Method Summary

Modifier and Type	Method	Description
void	checkBuild(ExprList args)	Partially checks if the iterator function can be executed with the given arguments.
List<List<NodeValue>>	exec(List<NodeValue> args)	IteratorFunction call to a list of evaluated argument values.
static com.jayway.jsonpath.Configuration	getConf()	Get the general JSONPath JayWay configuration.

Methods inherited from class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorFunctionBase

exec

Methods inherited from class fr.mines_stetienne.ci.sparql_generate.iterator.IteratorStreamFunctionBase

build, exec, getContext

Methods inherited from class java.lang.Object

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

Field Detail

URI

public static final String URI

See Also:

Constant Field Values

Constructor Detail

ITER_JSONPath

public ITER_JSONPath()

Method Detail

getConf

public static com.jayway.jsonpath.Configuration getConf()

Get the general JSONPath JayWay configuration.

Returns:

exec

public List<List<NodeValue>> exec(List<NodeValue> args)

Description copied from class: IteratorFunctionBase

IteratorFunction call to a list of evaluated argument values.

Specified by:

exec in class IteratorFunctionBase

Parameters:

args - -

Returns:

-

checkBuild

public void checkBuild(ExprList args)

Description copied from class: IteratorStreamFunctionBase

Partially checks if the iterator function can be executed with the given arguments.

Specified by:

checkBuild in class IteratorStreamFunctionBase

Parameters:

args - -