/**
* Execute the function. The function must return a valid object.
*
* @param xctxt The current execution context.
* @return A valid XObject.
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
final XObject obj = m_arg0.execute(xctxt);
final double val = obj.num();
if (val >= -0.5 && val < 0) return new XNumber(-0.0);
if (val == 0.0) return new XNumber(val);
return new XNumber(java.lang.Math.floor(val + 0.5));
}
/**
* Use an XPath string to select a nodelist. XPath namespace prefixes are resolved from the
* namespaceNode.
*
* @param contextNode The node to start searching from.
* @param xpathnode
* @param str
* @param namespaceNode The node from which prefixes in the XPath will be resolved to namespaces.
* @return A NodeIterator, should never be null.
* @throws TransformerException
*/
public NodeList selectNodeList(Node contextNode, Node xpathnode, String str, Node namespaceNode)
throws TransformerException {
// Execute the XPath, and have it return the result
XObject list = eval(contextNode, xpathnode, str, namespaceNode);
// Return a NodeList.
return list.nodelist();
}
/**
* Use an XPath string to select a nodelist. XPath namespace prefixes are resolved from the
* namespaceNode.
*
* @param contextNode The node to start searching from.
* @param xpathnode
* @param namespaceNode The node from which prefixes in the XPath will be resolved to namespaces.
* @return A NodeIterator, should never be null.
* @throws TransformerException
* @deprecated
*/
public NodeIterator selectNodeIterator(Node contextNode, Node xpathnode, Node namespaceNode)
throws TransformerException {
// Execute the XPath, and have it return the result
XObject list = eval(contextNode, xpathnode, getStrFromNode(xpathnode), namespaceNode);
// Have the XObject return its result as a NodeSetDTM.
return list.nodeset();
}
/**
* Get a global variable or parameter from the global stack frame.
*
* @param xctxt The XPath context, which must be passed in order to lazy evaluate variables.
* @param index Global variable index relative to the global stack frame bottom.
* @return The value of the variable.
* @throws TransformerException
*/
public XObject getGlobalVariable(XPathContext xctxt, final int index, boolean destructiveOK)
throws TransformerException {
XObject val = _stackFrames[index];
// Lazy execution of variables.
if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)
return (_stackFrames[index] = val.execute(xctxt));
return destructiveOK ? val : val.getFresh();
}
/**
* Get the XObject representation of the variable.
*
* @param transformer non-null reference to the the current transform-time state.
* @param sourceNode non-null reference to the <a
* href="http://www.w3.org/TR/xslt#dt-current-node">current source node</a>.
* @return the XObject representation of the variable.
* @throws javax.xml.transform.TransformerException
*/
public XObject getValue(TransformerImpl transformer, int sourceNode) throws TransformerException {
XObject var;
XPathContext xctxt = transformer.getXPathContext();
xctxt.pushCurrentNode(sourceNode);
try {
if (null != m_selectPattern) {
var = m_selectPattern.execute(xctxt, sourceNode, this);
var.allowDetachToRelease(false);
if (transformer.getDebug())
transformer
.getTraceManager()
.fireSelectedEvent(sourceNode, this, "select", m_selectPattern, var);
} else if (null == getFirstChildElem()) {
var = XString.EMPTYSTRING;
} else {
// Use result tree fragment.
// Global variables may be deferred (see XUnresolvedVariable) and hence
// need to be assigned to a different set of DTMs than local variables
// so they aren't popped off the stack on return from a template.
int df;
// Bugzilla 7118: A variable set via an RTF may create local
// variables during that computation. To keep them from overwriting
// variables at this level, push a new variable stack.
////// PROBLEM: This is provoking a variable-used-before-set
////// problem in parameters. Needs more study.
try {
////////// xctxt.getVarStack().link(0);
if (m_parentNode instanceof Stylesheet) // Global variable
df = transformer.transformToGlobalRTF(this);
else df = transformer.transformToRTF(this);
} finally {
////////////// xctxt.getVarStack().unlink();
}
var = new XRTreeFrag(df, xctxt, this);
}
} finally {
xctxt.popCurrentNode();
}
return var;
}
/**
* Get a local variable or parameter in the current stack frame.
*
* @param xctxt The XPath context, which must be passed in order to lazy evaluate variables.
* @param index Local variable index relative to the current stack frame bottom.
* @return The value of the variable.
* @throws TransformerException
*/
public XObject getLocalVariable(XPathContext xctxt, int index) throws TransformerException {
index += _currentFrameBottom;
XObject val = _stackFrames[index];
if (null == val)
throw new TransformerException(
XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_VARIABLE_ACCESSED_BEFORE_BIND, null),
xctxt.getSAXLocator());
// "Variable accessed before it is bound!", xctxt.getSAXLocator());
// Lazy execution of variables.
if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)
return (_stackFrames[index] = val.execute(xctxt));
return val;
}
/**
* Test a node to see if it matches any of the patterns in the union.
*
* @param xctxt XPath runtime context.
* @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST}, {@link
* org.apache.xpath.patterns.NodeTest#SCORE_NONE}, {@link
* org.apache.xpath.patterns.NodeTest#SCORE_NSWILD}, {@link
* org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or {@link
* org.apache.xpath.patterns.NodeTest#SCORE_OTHER}.
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
XObject bestScore = null;
int n = m_patterns.length;
for (int i = 0; i < n; i++) {
XObject score = m_patterns[i].execute(xctxt);
if (score != NodeTest.SCORE_NONE) {
if (null == bestScore) bestScore = score;
else if (score.num() > bestScore.num()) bestScore = score;
}
}
if (null == bestScore) {
bestScore = NodeTest.SCORE_NONE;
}
return bestScore;
}
/**
* Return the Java value corresponding to an XPath result.
*
* @param xo the XPath type
* @return the corresponding Java value per the JSTL mapping rules
* @throws TransformerException if there was a problem converting the type
*/
static Object coerceToJava(XObject xo) throws TransformerException {
if (xo instanceof XBoolean) {
return xo.bool();
} else if (xo instanceof XNumber) {
return xo.num();
} else if (xo instanceof XString) {
return xo.str();
} else if (xo instanceof XNodeSet) {
NodeList nodes = xo.nodelist();
// if there is only one node in the nodeset return it rather than the list
if (nodes.getLength() == 1) {
return nodes.item(0);
} else {
return nodes;
}
} else {
// unexpected result type
throw new AssertionError();
}
}
/**
* Apply the operation to two operands, and return the result.
*
* @param left non-null reference to the evaluated left operand.
* @param right non-null reference to the evaluated right operand.
* @return non-null reference to the XObject that represents the result of the operation.
* @throws javax.xml.transform.TransformerException
*/
public XObject operate(XObject left, XObject right)
throws javax.xml.transform.TransformerException {
return left.lessThan(right) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
/**
* Execute the function. The function must return a valid object.
*
* @param xctxt The current execution context.
* @return A valid XObject.
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {
// TransformerImpl transformer = (TransformerImpl)xctxt;
TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
XNodeSet nodes = null;
int context = xctxt.getCurrentNode();
DTM dtm = xctxt.getDTM(context);
int docContext = dtm.getDocumentRoot(context);
if (DTM.NULL == docContext) {
// path.error(context, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC); //"context does not
// have an owner document!");
}
String xkeyname = getArg0().execute(xctxt).str();
QName keyname = new QName(xkeyname, xctxt.getNamespaceContext());
XObject arg = getArg1().execute(xctxt);
boolean argIsNodeSetDTM = (XObject.CLASS_NODESET == arg.getType());
KeyManager kmgr = transformer.getKeyManager();
// Don't bother with nodeset logic if the thing is only one node.
if (argIsNodeSetDTM) {
XNodeSet ns = (XNodeSet) arg;
ns.setShouldCacheNodes(true);
int len = ns.getLength();
if (len <= 1) argIsNodeSetDTM = false;
}
if (argIsNodeSetDTM) {
Hashtable usedrefs = null;
DTMIterator ni = arg.iter();
int pos;
UnionPathIterator upi = new UnionPathIterator();
upi.exprSetParent(this);
while (DTM.NULL != (pos = ni.nextNode())) {
dtm = xctxt.getDTM(pos);
XMLString ref = dtm.getStringValue(pos);
if (null == ref) continue;
if (null == usedrefs) usedrefs = new Hashtable();
if (usedrefs.get(ref) != null) {
continue; // We already have 'em.
} else {
// ISTRUE being used as a dummy value.
usedrefs.put(ref, ISTRUE);
}
XNodeSet nl =
kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname, ref, xctxt.getNamespaceContext());
nl.setRoot(xctxt.getCurrentNode(), xctxt);
// try
// {
upi.addIterator(nl);
// }
// catch(CloneNotSupportedException cnse)
// {
// // will never happen.
// }
// mnodeset.addNodesInDocOrder(nl, xctxt); needed??
}
int current = xctxt.getCurrentNode();
upi.setRoot(current, xctxt);
nodes = new XNodeSet(upi);
} else {
XMLString ref = arg.xstr();
nodes = kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname, ref, xctxt.getNamespaceContext());
nodes.setRoot(xctxt.getCurrentNode(), xctxt);
}
return nodes;
}
/**
* Apply the operation to two operands, and return the result.
*
* @param right non-null reference to the evaluated right operand.
* @return non-null reference to the XObject that represents the result of the operation.
* @throws javax.xml.transform.TransformerException
*/
public XObject operate(XObject right) throws javax.xml.transform.TransformerException {
if (XObject.CLASS_BOOLEAN == right.getType()) return right;
else return right.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
/**
* Apply the operation to two operands, and return the result.
*
* @param left non-null reference to the evaluated left operand.
* @param right non-null reference to the evaluated right operand.
* @return non-null reference to the XObject that represents the result of the operation.
* @throws javax.xml.transform.TransformerException
*/
public XObject operate(XObject left, XObject right)
throws javax.xml.transform.TransformerException {
return new XNumber((int) (left.num() / right.num()));
}
/**
* 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;
}
