com.icl.saxon.expr

Class AttributeReference

class AttributeReference extends SingletonExpression

An expression that represents a reference to a named attribute

Constructor Summary
	AttributeReference(int fingerprint) Constructor

Method Summary
void	bindParentNode(NodeInfo node) Bind the reference to a particular node
void	display(int level) Diagnostic print of expression structure
boolean	evaluateAsBoolean(Context context) Evaluate as a boolean.
String	evaluateAsString(Context context) Evaluate as a string.
int	getDependencies() Determine which aspects of the context the expression depends on.
NodeInfo	getNode(Context context) Return the relevant attribute node
Expression	reduce(int dependencies, Context context) Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Constructor Detail

AttributeReference

public AttributeReference(int fingerprint)

Constructor

Method Detail

bindParentNode

public void bindParentNode(NodeInfo node)

Bind the reference to a particular node

display

public void display(int level)

Diagnostic print of expression structure

evaluateAsBoolean

public boolean evaluateAsBoolean(Context context)

Evaluate as a boolean. Returns true if there are any nodes selected by the NodeSetExpression

Parameters: context The context in which the expression is to be evaluated

Returns: true if there are any nodes selected by the NodeSetExpression

evaluateAsString

public String evaluateAsString(Context context)

Evaluate as a string. Returns the string value of the attribute if it exists

Parameters: context The context in which the expression is to be evaluated

Returns: true if there are any nodes selected by the NodeSetExpression

getDependencies

public int getDependencies()

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

getNode

public NodeInfo getNode(Context context)

Return the relevant attribute node

Parameters: context the evaluation context

reduce

public Expression reduce(int dependencies, Context context)

Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Parameters: dependencies The dependencies to be removed context The context to be used for the partial evaluation

Returns: a new expression that does not have any of the specified dependencies