org.apache.xpath.objects
Class XRTreeFragSelectWrapper

java.lang.Object
  org.apache.xpath.Expression
      org.apache.xpath.objects.XObject
          org.apache.xpath.objects.XRTreeFrag
              org.apache.xpath.objects.XRTreeFragSelectWrapper

All Implemented Interfaces:

Cloneable, ExpressionNode, Serializable, javax.xml.transform.SourceLocator, XPathVisitable

public class XRTreeFragSelectWrapper

extends XRTreeFrag

implements Cloneable

This class makes an select statement act like an result tree fragment.

See Also:

Serialized Form

Field Summary

(package private) XObject

m_selected

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

m_allowRelease, m_dtm, m_dtmRoot, m_xctxt

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

Fields inherited from class org.apache.xpath.Expression

Constructor Summary

XRTreeFragSelectWrapper(Expression expr)

Method Summary

DTMIterator	asNodeIterator() Cast result object to a DTMIterator.
void	detach() Detaches the DTMIterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.
XObject	execute(XPathContext xctxt) For support of literal objects in xpaths.
void	fixupVariables(Vector vars, int globalsSize) This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
int	getType() Tell what kind of class this is.
double	num() Cast result object to a number.
int	rtf() Cast result object to a result tree fragment.
String	str() Cast result object to a string.
XMLString	xstr() Cast result object to an XMLString.

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

allowDetachToRelease, appendToFsb, bool, convertToNodeset, destruct, equals, finalize, getTypeString, object

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

boolWithSideEffects, callVisitors, castToType, create, create, deepEquals, dispatchCharactersEvents, error, error, getFresh, greaterThan, greaterThanOrEqual, iter, lessThan, lessThanOrEqual, mutableNodeset, nodelist, nodeset, notEquals, numWithSideEffects, reset, rtf, rtree, rtree, toString

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, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

m_selected

XObject m_selected

Constructor Detail

XRTreeFragSelectWrapper

public XRTreeFragSelectWrapper(Expression expr)

Method Detail

fixupVariables

public void fixupVariables(Vector vars,
                           int globalsSize)

This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.

Overrides:

fixupVariables in class XObject

Parameters:

vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame).

execute

public XObject execute(XPathContext xctxt)
                throws javax.xml.transform.TransformerException

For support of literal objects in xpaths.

Overrides:

execute in class XObject

Parameters:

xctxt - The XPath execution context.

Returns:

the result of executing the select expression

Throws:

javax.xml.transform.TransformerException

detach

public void detach()

Detaches the DTMIterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. After detach has been invoked, calls to nextNode or previousNode will raise a runtime exception. In general, detach should only be called once on the object.

Overrides:

detach in class XRTreeFrag

num

public double num()
           throws javax.xml.transform.TransformerException

Cast result object to a number.

Overrides:

num in class XRTreeFrag

Returns:

The result tree fragment as a number or NaN

Throws:

javax.xml.transform.TransformerException

xstr

public XMLString xstr()

Cast result object to an XMLString.

Overrides:

xstr in class XRTreeFrag

Returns:

The document fragment node data or the empty string.

str

public String str()

Cast result object to a string.

Overrides:

str in class XRTreeFrag

Returns:

The document fragment node data or the empty string.

getType

public int getType()

Tell what kind of class this is.

Overrides:

getType in class XRTreeFrag

Returns:

the type of the select expression

rtf

public int rtf()

Cast result object to a result tree fragment.

Overrides:

rtf in class XRTreeFrag

Returns:

The document fragment this wraps

asNodeIterator

public DTMIterator asNodeIterator()

Cast result object to a DTMIterator.

Overrides:

asNodeIterator in class XRTreeFrag

Returns:

The document fragment as a DTMIterator