Class Attribute

    • Constructor Detail

      • Attribute

        public Attribute​(Expression attributeName,
                         Expression namespace,
                         NamespaceResolver nsContext,
                         int validationAction,
                         SimpleType schemaType,
                         int annotation,
                         boolean allowNameAsQName)
        Construct an Attribute instruction
        Parameters:
        attributeName - An expression to calculate the attribute name
        namespace - An expression to calculate the attribute namespace
        nsContext - a NamespaceContext object containing the static namespace context of the stylesheet instruction
        validationAction - e.g. validation=strict, lax, strip, preserve
        schemaType - Type against which the attribute must be validated. This must not be a namespace-sensitive type; it is the caller's responsibility to check this.
        annotation - Integer code identifying the type named in the type attribute
        allowNameAsQName -
    • Method Detail

      • setRejectDuplicates

        public void setRejectDuplicates()
        Indicate that two attributes with the same name are not acceptable. (This option is set in XQuery, but not in XSLT)
      • getCardinality

        public int getCardinality()
        Description copied from class: ComputedExpression
        Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.
        Specified by:
        getCardinality in interface Expression
        Overrides:
        getCardinality in class ComputedExpression
        Returns:
        one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).
      • computeSpecialProperties

        public int computeSpecialProperties()
        Get the static properties of this expression (other than its type). The result is bit-signficant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.
        Overrides:
        computeSpecialProperties in class SimpleNodeConstructor
        Returns:
        a set of flags indicating static properties of this expression
      • promoteInst

        protected void promoteInst​(PromotionOffer offer)
                            throws XPathException
        Offer promotion for subexpressions. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.
        Overrides:
        promoteInst in class SimpleNodeConstructor
        Parameters:
        offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression
        Throws:
        XPathException - if any error is detected
      • checkPermittedContents

        public void checkPermittedContents​(SchemaType parentType,
                                           StaticContext env,
                                           boolean whole)
                                    throws XPathException
        Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. It's always OK to say yes, since the check will be repeated at run-time. The process of checking element and attribute constructors against the content model of a complex type also registers the type of content expected of those constructors, so the static validation can continue recursively.
        Specified by:
        checkPermittedContents in interface Expression
        Overrides:
        checkPermittedContents in class ComputedExpression
        Parameters:
        parentType - The schema type
        env - the static context
        whole - true if this expression is expected to make the whole content of the type, false if it is expected to make up only a part
        Throws:
        XPathException - if the expression doesn't match the required content type
      • display

        public void display​(int level,
                            java.io.PrintStream out,
                            Configuration config)
        Display this instruction as an expression, for diagnostics
        Specified by:
        display in interface Expression
        Overrides:
        display in class SimpleNodeConstructor
        Parameters:
        level - indentation level for this expression
        out - Output destination