Class OpFilter

    • Method Detail

      • filter

        public static Op filter​(Expr expr,
                                Op op)
        Add expression - mutates an existing filter
      • ensureFilter

        public static OpFilter ensureFilter​(Op op)
        Ensure that the algebra op is a filter. If the input is a filter, just return that, else create a filter with no expressions and "this" as the subOp.
        API Note:
        This operation assumes the caller is going to add expressions. Filters without any expressions are discouraged. Consider collecting the expressions together first and using filterBy(org.apache.jena.sparql.expr.ExprList, org.apache.jena.sparql.algebra.Op).
      • filterBy

        public static Op filterBy​(ExprList exprs,
                                  Op op)
        Combine an ExprList with an Op so that the expressions filter the Op. If the exprs are empty, return the Op. If the op is already a OpFilter, merge the expressions into the filters existing expressions. Else create a new OpFilter with the expressions and subOp.
      • filterAlways

        public static OpFilter filterAlways​(ExprList exprs,
                                            Op subOp)
        Create a OpFilter with the expressions and subOp. If subOp is a filter, combine expressions (de-layer).
      • filterDirect

        public static OpFilter filterDirect​(ExprList exprs,
                                            Op op)
        Make a OpFilter - guaranteed to return an fresh OpFilter
      • filterDirect

        public static OpFilter filterDirect​(Expr expr,
                                            Op op)
        Make a OpFilter - guaranteed to return an fresh OpFilter
      • tidy

        public static OpFilter tidy​(OpFilter base)
        Compress multiple filters: (filter (filter (filter op)))) into one (filter op)
      • getName

        public java.lang.String getName()
      • visit

        public void visit​(OpVisitor opVisitor)
      • copy

        public Op1 copy​(Op subOp)
        Specified by:
        copy in class Op1
      • hashCode

        public int hashCode()
        Specified by:
        hashCode in class OpBase