org.aksw.sparqlify.compile.sparql

Class PushDown

java.lang.Object

org.aksw.sparqlify.compile.sparql.PushDown

public class PushDown
extends Object

Pushes down expressions on the sparql level

Author:

Claus Stadler

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	logger
static Map<String,org.aksw.sparqlify.compile.sparql.ExprPusher>	userFuncToPusher

Constructor Summary

Constructors

Constructor and Description
PushDown()

Method Summary

Methods

Modifier and Type	Method and Description
static SqlAggregator	_pushDownAgg(com.hp.hpl.jena.sparql.expr.aggregate.Aggregator agg)
static SqlExprList	extractSqlExprs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs) This method returns null - unless all of list's items are instances of ExprSqlBridges.
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.E_IsIRI expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.E_Lang expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.E_NotEquals expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.Expr expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.ExprAggregator expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.ExprFunction expr) A new attempt on the push down: Rather than first calling pre-push, we first descend depth first, and invoke push recursively.
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(ExprSqlBridge expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDown(com.hp.hpl.jena.sparql.expr.NodeValue expr)
static SqlAggregatorCount	pushDownAgg(com.hp.hpl.jena.sparql.expr.aggregate.AggCount agg)
static com.hp.hpl.jena.sparql.expr.ExprList	pushDownArgs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs)
static com.hp.hpl.jena.sparql.expr.Expr	pushDownE(com.hp.hpl.jena.sparql.expr.NodeValue expr)
static com.hp.hpl.jena.sparql.expr.Expr	pushDownMM(com.hp.hpl.jena.sparql.expr.Expr expr) Based on a expr, creates a new expr where the nodes that could be pushed down are replaced with ExprSqrBridge objects.
static com.hp.hpl.jena.sparql.expr.Expr	pushDownOld(com.hp.hpl.jena.sparql.expr.ExprFunction expr)

Methods inherited from class java.lang.Object

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

Field Detail

logger

public static final org.slf4j.Logger logger

userFuncToPusher

public static final Map<String,org.aksw.sparqlify.compile.sparql.ExprPusher> userFuncToPusher

Constructor Detail

PushDown

public PushDown()

Method Detail

pushDownMM

public static com.hp.hpl.jena.sparql.expr.Expr pushDownMM(com.hp.hpl.jena.sparql.expr.Expr expr)

Based on a expr, creates a new expr where the nodes that could be pushed down are replaced with ExprSqrBridge objects.

Parameters:

expr -

Returns:

pushDownArgs

public static com.hp.hpl.jena.sparql.expr.ExprList pushDownArgs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.Expr expr)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.ExprAggregator expr)

_pushDownAgg

public static SqlAggregator _pushDownAgg(com.hp.hpl.jena.sparql.expr.aggregate.Aggregator agg)

pushDownAgg

public static SqlAggregatorCount pushDownAgg(com.hp.hpl.jena.sparql.expr.aggregate.AggCount agg)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.E_Lang expr)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(ExprSqlBridge expr)

extractSqlExprs

public static SqlExprList extractSqlExprs(Iterable<com.hp.hpl.jena.sparql.expr.Expr> exprs)

This method returns null - unless all of list's items are instances of ExprSqlBridges. In this case the list of sql nodes is retrieved

Parameters:

expr -

Returns:

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.NodeValue expr)

pushDownE

public static com.hp.hpl.jena.sparql.expr.Expr pushDownE(com.hp.hpl.jena.sparql.expr.NodeValue expr)
                                                  throws Exception

Throws:

Exception

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.ExprFunction expr)

A new attempt on the push down: Rather than first calling pre-push, we first descend depth first, and invoke push recursively. The result of the push down is always an rdf-term object. The result of the push down can eventually be obtained by taking the value object of the final rdf-term object.

Parameters:

expr -

Returns:

pushDownOld

public static com.hp.hpl.jena.sparql.expr.Expr pushDownOld(com.hp.hpl.jena.sparql.expr.ExprFunction expr)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.E_IsIRI expr)

pushDown

public static com.hp.hpl.jena.sparql.expr.Expr pushDown(com.hp.hpl.jena.sparql.expr.E_NotEquals expr)