/**
* Set an argument expression for a function. This method is called by the XPath compiler.
*
* @param arg non-null expression that represents the argument.
* @param argNum The argument number index.
* @throws WrongNumberArgsException If the argNum parameter is greater than 0.
*/
public void setArg(Expression arg, int argNum) throws WrongNumberArgsException {
if (0 == argNum) {
m_arg0 = arg;
arg.exprSetParent(this);
} else reportWrongNumberArgs();
}
/** @see Expression#deepEquals(Expression) */
public boolean deepEquals(Expression expr) {
if (!super.deepEquals(expr)) return false;
FilterExprWalker walker = (FilterExprWalker) expr;
if (!m_expr.deepEquals(walker.m_expr)) return false;
return true;
}
/** @see Expression#deepEquals(Expression) */
public boolean deepEquals(Expression expr) {
if (!super.deepEquals(expr)) return false;
if (null != m_arg0) {
if (null == ((FunctionOneArg) expr).m_arg0) return false;
if (!m_arg0.deepEquals(((FunctionOneArg) expr).m_arg0)) return false;
} else if (null != ((FunctionOneArg) expr).m_arg0) return false;
return true;
}
/**
* Call the children visitors.
*
* @param visitor The visitor whose appropriate method will be called.
*/
public void callChildVisitors(XSLTVisitor visitor, boolean callAttributes) {
if (callAttributes && (null != m_selectExpression))
m_selectExpression.callVisitors(this, visitor);
int length = getSortElemCount();
for (int i = 0; i < length; i++) {
getSortElem(i).callVisitors(visitor);
}
super.callChildVisitors(visitor, callAttributes);
}
/**
* This function is called after everything else has been recomposed, and allows the template to
* set remaining values that may be based on some other property that depends on recomposition.
*
* <p>NEEDSDOC @param sroot
*
* @throws TransformerException
*/
public void compose(StylesheetRoot sroot) throws TransformerException {
super.compose(sroot);
int length = getSortElemCount();
for (int i = 0; i < length; i++) {
getSortElem(i).compose(sroot);
}
java.util.Vector vnames = sroot.getComposeState().getVariableNames();
if (null != m_selectExpression)
m_selectExpression.fixupVariables(vnames, sroot.getComposeState().getGlobalsSize());
else {
m_selectExpression = getStylesheetRoot().m_selectDefault.getExpression();
}
}
/**
* This will traverse the heararchy, calling the visitor for each member. If the called visitor
* method returns false, the subtree should not be called.
*
* @param visitor The visitor whose appropriate method will be called.
*/
public void callPredicateVisitors(XPathVisitor visitor) {
m_expr.callVisitors(new filterExprOwner(), visitor);
super.callPredicateVisitors(visitor);
}
/** @see ExpressionOwner#setExpression(Expression) */
public void setExpression(Expression exp) {
exp.exprSetParent(FilterExprWalker.this);
m_expr = exp;
}
/** Set the inner contained expression of this filter. */
public void setInnerExpression(Expression expr) {
expr.exprSetParent(this);
m_expr = expr;
}
/**
* This function is used to fixup variables from QNames to stack frame indexes at stylesheet build
* time.
*
* @param 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).
*/
public void fixupVariables(java.util.Vector vars, int globalsSize) {
super.fixupVariables(vars, globalsSize);
m_expr.fixupVariables(vars, globalsSize);
}
/** @see ExpressionOwner#setExpression(Expression) */
public void setExpression(Expression exp) {
exp.exprSetParent(this);
m_selectExpression = exp;
}
/**
* This function is used to fixup variables from QNames to stack frame indexes at stylesheet build
* time.
*
* @param 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).
*/
public void fixupVariables(java.util.Vector vars, int globalsSize) {
if (null != m_arg0) m_arg0.fixupVariables(vars, globalsSize);
}
/**
* Tell if this expression or it's subexpressions can traverse outside the current subtree.
*
* @return true if traversal outside the context node's subtree can occur.
*/
public boolean canTraverseOutsideSubtree() {
return m_arg0.canTraverseOutsideSubtree();
}
/** @see ExpressionOwner#setExpression(Expression) */
public void setExpression(Expression exp) {
exp.exprSetParent(this);
m_arg0 = exp;
}
/** @see org.apache.xpath.XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor) */
public void callArgVisitors(XPathVisitor visitor) {
if (null != m_arg0) m_arg0.callVisitors(this, visitor);
}
/**
* Perform a query if needed, and call transformNode for each child.
*
* @param transformer non-null reference to the the current transform-time state.
* @throws TransformerException Thrown in a variety of circumstances.
* @xsl.usage advanced
*/
public void transformSelectedNodes(TransformerImpl transformer) throws TransformerException {
final XPathContext xctxt = transformer.getXPathContext();
final int sourceNode = xctxt.getCurrentNode();
DTMIterator sourceNodes = m_selectExpression.asIterator(xctxt, sourceNode);
try {
final Vector keys =
(m_sortElems == null) ? null : transformer.processSortKeys(this, sourceNode);
// Sort if we need to.
if (null != keys) sourceNodes = sortNodes(xctxt, keys, sourceNodes);
if (transformer.getDebug()) {
// The original code, which is broken for bug#16889,
// which fails to get the original select expression in the select event.
/* transformer.getTraceManager().fireSelectedEvent(
* sourceNode,
* this,
* "select",
* new XPath(m_selectExpression),
* new org.apache.xpath.objects.XNodeSet(sourceNodes));
*/
// The following code fixes bug#16889
// Solution: Store away XPath in setSelect(Xath), and use it here.
// Pass m_xath, which the current node is associated with, onto the TraceManager.
Expression expr = m_xpath.getExpression();
org.apache.xpath.objects.XObject xObject = expr.execute(xctxt);
int current = xctxt.getCurrentNode();
transformer.getTraceManager().fireSelectedEvent(current, this, "select", m_xpath, xObject);
}
xctxt.pushCurrentNode(DTM.NULL);
IntStack currentNodes = xctxt.getCurrentNodeStack();
xctxt.pushCurrentExpressionNode(DTM.NULL);
IntStack currentExpressionNodes = xctxt.getCurrentExpressionNodeStack();
xctxt.pushSAXLocatorNull();
xctxt.pushContextNodeList(sourceNodes);
transformer.pushElemTemplateElement(null);
// pushParams(transformer, xctxt);
// Should be able to get this from the iterator but there must be a bug.
DTM dtm = xctxt.getDTM(sourceNode);
int docID = sourceNode & DTMManager.IDENT_DTM_DEFAULT;
int child;
while (DTM.NULL != (child = sourceNodes.nextNode())) {
currentNodes.setTop(child);
currentExpressionNodes.setTop(child);
if ((child & DTMManager.IDENT_DTM_DEFAULT) != docID) {
dtm = xctxt.getDTM(child);
docID = child & DTMManager.IDENT_DTM_DEFAULT;
}
// final int exNodeType = dtm.getExpandedTypeID(child);
final int nodeType = dtm.getNodeType(child);
// Fire a trace event for the template.
if (transformer.getDebug()) {
transformer.getTraceManager().fireTraceEvent(this);
}
// And execute the child templates.
// Loop through the children of the template, calling execute on
// each of them.
for (ElemTemplateElement t = this.m_firstChild; t != null; t = t.m_nextSibling) {
xctxt.setSAXLocator(t);
transformer.setCurrentElement(t);
t.execute(transformer);
}
if (transformer.getDebug()) {
// We need to make sure an old current element is not
// on the stack. See TransformerImpl#getElementCallstack.
transformer.setCurrentElement(null);
transformer.getTraceManager().fireTraceEndEvent(this);
}
// KLUGE: Implement <?xalan:doc_cache_off?>
// ASSUMPTION: This will be set only when the XPath was indeed
// a call to the Document() function. Calling it in other
// situations is likely to fry Xalan.
//
// %REVIEW% We need a MUCH cleaner solution -- one that will
// handle cleaning up after document() and getDTM() in other
// contexts. The whole SourceTreeManager mechanism should probably
// be moved into DTMManager rather than being explicitly invoked in
// FuncDocument and here.
if (m_doc_cache_off) {
if (DEBUG)
System.out.println(
"JJK***** CACHE RELEASE *****\n" + "\tdtm=" + dtm.getDocumentBaseURI());
// NOTE: This will work because this is _NOT_ a shared DTM, and thus has
// only a single Document node. If it could ever be an RTF or other
// shared DTM, this would require substantial rework.
xctxt.getSourceTreeManager().removeDocumentFromCache(dtm.getDocument());
xctxt.release(dtm, false);
}
}
} finally {
if (transformer.getDebug())
transformer
.getTraceManager()
.fireSelectedEndEvent(
sourceNode,
this,
"select",
new XPath(m_selectExpression),
new org.apache.xpath.objects.XNodeSet(sourceNodes));
xctxt.popSAXLocator();
xctxt.popContextNodeList();
transformer.popElemTemplateElement();
xctxt.popCurrentExpressionNode();
xctxt.popCurrentNode();
sourceNodes.detach();
}
}
/** @see ExpressionOwner#setExpression(Expression) */
public void setExpression(Expression exp) {
exp.exprSetParent(UnionPattern.this);
m_patterns[m_index] = (StepPattern) exp;
}
/**
* For support of literal objects in xpaths.
*
* @param xctxt The XPath execution context.
* @return This object.
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
Expression expr = ((ElemVariable) m_obj).getSelect().getExpression();
XObject xobj = expr.execute(xctxt);
xobj.allowDetachToRelease(false);
return xobj;
}
