Package org.apache.xalan.templates
Class XUnresolvedVariable
- java.lang.Object
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- org.apache.xpath.Expression
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- org.apache.xpath.objects.XObject
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- org.apache.xalan.templates.XUnresolvedVariable
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,javax.xml.transform.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
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Field Summary
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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
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Constructor Summary
Constructors Constructor 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.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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. at the point we should terminate the search.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
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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
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Constructor Detail
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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.
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Method Detail
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execute
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
For support of literal objects in xpaths.
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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.
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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.
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getType
public int getType()
Tell what kind of class this is.
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getTypeString
public java.lang.String getTypeString()
Given a request type, return the equivalent string. For diagnostic purposes.- Overrides:
getTypeString
in classXObject
- Returns:
- An informational string.
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