Package net.sf.saxon.instruct

Class ParentNodeConstructor

    • Field Detail

      • validation

        int validation

    • Constructor Detail

      • ParentNodeConstructor

        public ParentNodeConstructor()

    • Method Detail

      • setBaseURI

        public void setBaseURI​(java.lang.String uri)

      • getBaseURI

        protected java.lang.String getBaseURI()

      • setLazyConstruction

        public void setLazyConstruction​(boolean lazy)
        Indicate that lazy construction should (or should not) be used
        Parameters:
        lazy - set to true if lazy construction should be used

      • isLazyConstruction

        public final boolean isLazyConstruction()
        Establish whether lazy construction is to be used

      • setSchemaType

        public void setSchemaType​(SchemaType type)
        Set the schema type to be used for validation

      • getSchemaType

        public SchemaType getSchemaType()
        Get the schema type chosen for validation; null if not defined

      • isNamespaceSensitive

        public boolean isNamespaceSensitive()
        Determine whether the schema type is namespace sensitive. The result is undefined if schemaType is null.

      • getValidationAction

        public int getValidationAction()
        Get the validation mode for this instruction
        Returns:
        the validation mode, for example Validation.STRICT or Validation.PRESERVE

      • setContentExpression

        public void setContentExpression​(Expression content)
        Set the expression that constructs the content of the element

      • getContentExpression

        public Expression getContentExpression()
        Get the expression that constructs the content of the element

      • simplify

        public Expression simplify​(StaticContext env)
                    throws XPathException
        Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing.
        Specified by:
        simplify in interface Expression
        Specified by:
        simplify in class Instruction
        Parameters:
        env - the static context
        Returns:
        the simplified expression
        Throws:
        XPathException - if an error is discovered during expression rewriting

      • typeCheck

        public Expression typeCheck​(StaticContext env,
                            ItemType contextItemType)
                     throws XPathException
        Description copied from interface: Expression
        Perform type checking of an expression and its subexpressions. This is the second phase of static optimization.

        This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.

        This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.

        If the implementation returns a value other than "this", then it is required to ensure that the parent pointer and location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.

        Parameters:
        env - the static context of the expression
        contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE
        Returns:
        the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations
        Throws:
        StaticError - if an error is discovered during this phase (typically a type error)
        XPathException

      • optimize

        public Expression optimize​(Optimizer opt,
                           StaticContext env,
                           ItemType contextItemType)
                    throws XPathException
        Description copied from interface: Expression
        Perform optimisation of an expression and its subexpressions. This is the third and final phase of static optimization.

        This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

        Parameters:
        opt - the optimizer in use. This provides access to supporting functions; it also allows different optimization strategies to be used in different circumstances.
        env - the static context of the expression
        contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE
        Returns:
        the original expression, rewritten if appropriate to optimize execution
        Throws:
        StaticError - if an error is discovered during this phase (typically a type error)
        XPathException

      • replaceSubExpression

        public boolean replaceSubExpression​(Expression original,
                                    Expression replacement)
        Replace one subexpression by a replacement subexpression
        Specified by:
        replaceSubExpression in interface Container
        Overrides:
        replaceSubExpression in class ComputedExpression
        Parameters:
        original - the original subexpression
        replacement - the replacement subexpression
        Returns:
        true if the original subexpression is found

      • createsNewNodes

        public final boolean createsNewNodes()
        Determine whether this instruction creates new nodes. This implementation returns true.
        Overrides:
        createsNewNodes in class Instruction

      • 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).

      • verifyLazyConstruction

        void verifyLazyConstruction()
        Check that lazy construction is possible for this element