org.aksw.sparqlify.algebra.sparql.transform

Class ExprDatatypeHash

java.lang.Object

org.aksw.sparqlify.algebra.sparql.transform.ExprDatatypeHash

public class ExprDatatypeHash
extends Object

Compute a hash for an expression based on their structure and datatypes of the leaf nodes. The hash is designed so that expressions whose inner nodes are structurally equivalent, and have the same datetypes for leaves yield the same hash. TODO Should be done for SQL Expressions

Author:

raven

Constructor Summary

Constructors

Constructor and Description
ExprDatatypeHash()

Method Summary

Methods

Modifier and Type	Method and Description
static int	_hash(com.hp.hpl.jena.sparql.expr.ExprFunction expr, Map<String,SqlDatatype> columnToDatatype)
static int	_hash(com.hp.hpl.jena.sparql.expr.ExprVar expr, Map<String,SqlDatatype> columnToDatatype)
static int	_hash(com.hp.hpl.jena.sparql.expr.NodeValue expr, Map<String,SqlDatatype> columnToDatatype)
static int	_hashArgs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs, Map<String,SqlDatatype> columnToDatatype)
static int	hash(com.hp.hpl.jena.sparql.expr.Expr expr, Map<String,SqlDatatype> columnToDatatype)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprDatatypeHash

public ExprDatatypeHash()

Method Detail

hash

public static int hash(com.hp.hpl.jena.sparql.expr.Expr expr,
       Map<String,SqlDatatype> columnToDatatype)

_hashArgs

public static int _hashArgs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs,
            Map<String,SqlDatatype> columnToDatatype)

_hash

public static int _hash(com.hp.hpl.jena.sparql.expr.ExprFunction expr,
        Map<String,SqlDatatype> columnToDatatype)

_hash

public static int _hash(com.hp.hpl.jena.sparql.expr.ExprVar expr,
        Map<String,SqlDatatype> columnToDatatype)

_hash

public static int _hash(com.hp.hpl.jena.sparql.expr.NodeValue expr,
        Map<String,SqlDatatype> columnToDatatype)