/**
* Returns the value of the expression as a number.
*
* @param node the current node
* @param env the variable environment.
*/
public double evalNumber(Node node, ExprEnvironment env) throws XPathException {
Node value = _pattern.findAny(node, env);
if (value == null) return Double.NaN;
String string = XmlUtil.textValue(value);
return stringToNumber(string);
}
/**
* Returns true if there are any patterns matching the pattern.
*
* @param node the current node
* @param env the variable environment.
*/
public boolean evalBoolean(Node node, ExprEnvironment env) throws XPathException {
return _pattern.findAny(node, env) != null;
}
/**
* Returns the value of the node set expression as a string. The value is the text value of the
* first node.
*
* @param node the current node
* @param env the variable environment
* @return the combined text value of the node.
*/
public String evalString(Node node, ExprEnvironment env) throws XPathException {
Node value = _pattern.findAny(node, env);
if (value == null) return "";
else return XmlUtil.textValue(value);
}
