iot.jcypher.query.api.predicate

Interface IBeforePredicate

All Known Implementing Classes:

Concat

public interface IBeforePredicate

Method Summary

Methods

Modifier and Type	Method and Description
Concat	BR_OPEN() JCYPHER open a bracket; allows to nest expressions, must have a matching BR_CLOSE() e.g. ...
Concatenator	existsPattern(IElement X) JCYPHER matches a pattern expression against the graph.
Concatenator	has(IHas val) JCYPHER tests for existence of node labels or node/relation properties, accepts expressions like 'n.property("age")', or 'n.label("Swedish")' e.g. ...
Concatenator	holdsTrue(IPredicateFunction I) JCYPHER iterates over a collection allowing to test each element of the collection against a predicate expression Use Factory Class I to create Expressions e.g. ...
IBeforePredicate	NOT() JCYPHER negate a boolean e.g. ...
BooleanOperation	valueOf(ValueElement val) JCYPHER takes an expression like 'n.property("age")', yielding a property, or 'x.length()', calculating some value, or takes simply a reference to a value like x e.g. ...

Method Detail

valueOf

BooleanOperation valueOf(ValueElement val)

JCYPHER

takes an expression like 'n.property("age")', yielding a property,

or 'x.length()', calculating some value, or takes simply a reference to a value like x

e.g. ...valueOf(n.property("age"))...

has

Concatenator has(IHas val)

JCYPHER

tests for existence of node labels or node/relation properties,

accepts expressions like 'n.property("age")',

or 'n.label("Swedish")'

e.g. ...has(n.property("age"))

NOT

IBeforePredicate NOT()

JCYPHER

negate a boolean

e.g. ...NOT().has(n.property("age"))

BR_OPEN

Concat BR_OPEN()

JCYPHER

open a bracket; allows to nest expressions, must have a matching BR_CLOSE()

e.g. ...BR_OPEN()
.valueOf(charlie.property("lastName")).EQUALS("Sheen")
.BR_CLOSE()

existsPattern

Concatenator existsPattern(IElement X)

JCYPHER

matches a pattern expression against the graph. If the result is empty, returns false, else returns true

Use Factory Class X to create Expressions

e.g. ...existsPattern(X.node(n)...)

holdsTrue

Concatenator holdsTrue(IPredicateFunction I)

JCYPHER

iterates over a collection allowing to test each element of the collection against a predicate expression

Use Factory Class I to create Expressions

e.g. ...holdsTrue(I.forAll(n)...)