private Node build() throws ELException {
Node n = createNodeInternal(this.expression);
this.prepare(n);
if (n instanceof AstDeferredExpression || n instanceof AstDynamicExpression) {
n = n.jjtGetChild(0);
}
return n;
}
private static final Node createNodeInternal(String expr) throws ELException {
if (expr == null) {
throw new ELException(MessageFactory.get("error.null"));
}
Node n = (Node) cache.get(expr);
if (n == null && (n = (Node) cache2.get(expr)) == null) {
try {
n = (new ELParser(new StringReader(expr))).CompositeExpression();
// validate composite expression
if (n instanceof AstCompositeExpression) {
int numChildren = n.jjtGetNumChildren();
if (numChildren == 1) {
n = n.jjtGetChild(0);
} else {
Class type = null;
Node child = null;
for (int i = 0; i < numChildren; i++) {
child = n.jjtGetChild(i);
if (child instanceof AstLiteralExpression) continue;
if (type == null) type = child.getClass();
else {
if (!type.equals(child.getClass())) {
throw new ELException(MessageFactory.get("error.mixed", expr));
}
}
}
}
}
if (n instanceof AstDeferredExpression || n instanceof AstDynamicExpression) {
n = n.jjtGetChild(0);
}
if (cache.size() > SIZE) {
cache2.clear();
cache2.putAll(cache);
cache.clear();
}
cache.put(expr, n);
} catch (ParseException pe) {
throw new ELException("Error Parsing: " + expr, pe);
}
}
return n;
}