org.apache.xalan.templates

Class XUnresolvedVariable

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.objects.XObject

org.apache.xalan.templates.XUnresolvedVariable

All Implemented Interfaces:

Serializable, Cloneable, SourceLocator, ExpressionNode, XPathVisitable

public class XUnresolvedVariable
extends XObject

An instance of this class holds unto a variable until it is executed. It is used at this time for global variables which must (we think) forward reference.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.xpath.objects.XObject

CLASS_BOOLEAN, CLASS_NODESET, CLASS_NULL, CLASS_NUMBER, CLASS_RTREEFRAG, CLASS_STRING, CLASS_UNKNOWN, CLASS_UNRESOLVEDVARIABLE, m_obj

Constructor Summary

Constructors

Constructor and Description
XUnresolvedVariable(ElemVariable obj, int sourceNode, TransformerImpl transformer, int varStackPos, int varStackContext, boolean isGlobal) Create an XUnresolvedVariable, that may be executed at a later time.

Method Summary

Modifier and Type	Method and Description
XObject	execute(XPathContext xctxt) For support of literal objects in xpaths.
int	getType() Tell what kind of class this is.
String	getTypeString() Given a request type, return the equivalent string.
void	setVarStackContext(int bottom) Set an index into the variable stack where the variable context ends, i.e.
void	setVarStackPos(int top) Set an index to the point in the variable stack where we should begin variable searches for evaluation of expressions.

Methods inherited from class org.apache.xpath.objects.XObject

allowDetachToRelease, appendToFsb, bool, boolWithSideEffects, callVisitors, castToType, create, create, deepEquals, destruct, detach, dispatchCharactersEvents, equals, error, error, fixupVariables, getFresh, greaterThan, greaterThanOrEqual, iter, lessThan, lessThanOrEqual, mutableNodeset, nodelist, nodeset, notEquals, num, numWithSideEffects, object, reset, rtf, rtf, rtree, rtree, setObject, str, toString, xstr

Methods inherited from class org.apache.xpath.Expression

asIterator, asIteratorRaw, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

XUnresolvedVariable

public XUnresolvedVariable(ElemVariable obj,
                           int sourceNode,
                           TransformerImpl transformer,
                           int varStackPos,
                           int varStackContext,
                           boolean isGlobal)

Create an XUnresolvedVariable, that may be executed at a later time. This is primarily used so that forward referencing works with global variables. An XUnresolvedVariable is initially pushed into the global variable stack, and then replaced with the real thing when it is accessed.

Parameters:

obj - Must be a non-null reference to an ElemVariable.

sourceNode - The node context for execution.

transformer - The transformer execution context.

varStackPos - An index to the point in the variable stack where we should begin variable searches for evaluation of expressions.

varStackContext - An index into the variable stack where the variable context ends, i.e. at the point we should terminate the search.

isGlobal - true if this is a global variable.

Method Detail

execute

public XObject execute(XPathContext xctxt)
                throws TransformerException

For support of literal objects in xpaths.

Overrides:

execute in class XObject

Parameters:

xctxt - The XPath execution context.

Returns:

This object.

Throws:

TransformerException

setVarStackPos

public void setVarStackPos(int top)

Set an index to the point in the variable stack where we should begin variable searches for evaluation of expressions. This is -1 if m_isTopLevel is false.

Parameters:

top - A valid value that specifies where in the variable stack the search should begin.

setVarStackContext

public void setVarStackContext(int bottom)

Set an index into the variable stack where the variable context ends, i.e. at the point we should terminate the search.

Parameters:

bottom - The point at which the search should terminate, normally zero for global variables.

getType

public int getType()

Tell what kind of class this is.

Overrides:

getType in class XObject

Returns:

CLASS_UNRESOLVEDVARIABLE

getTypeString

public String getTypeString()

Given a request type, return the equivalent string. For diagnostic purposes.

Overrides:

getTypeString in class XObject

Returns:

An informational string.