OpFilter (Sparqlify SPARQL->SQL rewriter

Methods
Modifier and Type	Method and Description
`static Op`	`filter(com.hp.hpl.jena.sparql.expr.ExprList exprs, Op op)`
`static Op`	`filter(com.hp.hpl.jena.sparql.expr.Expr expr, Op op)`
`static OpFilter`	`filter(Op op)`
`static OpFilter`	`filterDirect(com.hp.hpl.jena.sparql.expr.ExprList exprs, Op op)` Make a OpFilter - guarantteed to return an OpFilter
`com.hp.hpl.jena.sparql.expr.ExprList`	`getExprs()`
`String`	`getName()`
`int`	`hashCode()`
`static OpFilter`	`tidy(OpFilter base)` Compress multiple filters: (filter (filter (filter op)))) into one (filter op)

Methods inherited from class org.aksw.sparqlify.algebra.sparql.nodes.OpBase1
getSubOp

public static Op filter(com.hp.hpl.jena.sparql.expr.Expr expr,
        Op op)

public static Op filter(com.hp.hpl.jena.sparql.expr.ExprList exprs,
        Op op)

public static OpFilter filterDirect(com.hp.hpl.jena.sparql.expr.ExprList exprs,
                    Op op)

Make a OpFilter - guarantteed to return an OpFilter

tidy
```
public static OpFilter tidy(OpFilter base)
```
Compress multiple filters: (filter (filter (filter op)))) into one (filter op)

public com.hp.hpl.jena.sparql.expr.ExprList getExprs()

Class OpFilter