org.apache.xalan.templates
Class XUnresolvedVariable

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.objects.XObject
              |
              +--org.apache.xalan.templates.XUnresolvedVariable

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

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
 
Constructor Summary
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
 XObject execute(XPathContext xctxt)
          For support of literal objects in xpaths.
 int getType()
          Tell what kind of class this is.
 java.lang.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, fixupVariables, getFresh, greaterThan, greaterThanOrEqual, iter, lessThan, lessThanOrEqual, mutableNodeset, nodelist, nodeset, notEquals, num, numWithSideEffects, object, reset, rtf, rtf, rtree, rtree, 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, isStableNumber, num, warn, xstr
 
Methods inherited from class java.lang.Object
equals, 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.
Parameters:
xctxt - The XPath execution context.
Returns:
This object.
Throws:
TransformerException -  
Overrides:
execute in class XObject

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.
Returns:
CLASS_UNRESOLVEDVARIABLE
Overrides:
getType in class XObject

getTypeString

public java.lang.String getTypeString()
Given a request type, return the equivalent string. For diagnostic purposes.
Returns:
An informational string.
Overrides:
getTypeString in class XObject


Copyright 2006 Apache XML Project. All Rights Reserved.