/*
* (non-Javadoc)
*
* @see com.sun.el.parser.NodeVisitor#visit(com.sun.el.parser.Node)
*/
@Override
public void visit(Node node) throws ELException {
if (node instanceof AstFunction) {
AstFunction funcNode = (AstFunction) node;
if (this.fnMapper == null) {
throw new ELException(MESSAGES.missingFunctionMapper());
}
Method m = fnMapper.resolveFunction(funcNode.getPrefix(), funcNode.getLocalName());
if (m == null) {
throw new ELException(MESSAGES.functionNotFound(funcNode.getOutputName()));
}
int pcnt = m.getParameterTypes().length;
if (node.jjtGetNumChildren() != pcnt) {
throw new ELException(
MESSAGES.functionWrongParameterCount(
funcNode.getOutputName(), pcnt, node.jjtGetNumChildren()));
}
} else if (node instanceof AstIdentifier && this.varMapper != null) {
String variable = ((AstIdentifier) node).getImage();
// simply capture it
this.varMapper.resolveVariable(variable);
}
}
/*
* (non-Javadoc)
*
* @see com.sun.el.parser.NodeVisitor#visit(com.sun.el.parser.Node)
*/
public void visit(Node node) throws ELException {
if (node instanceof AstFunction) {
AstFunction funcNode = (AstFunction) node;
if (this.fnMapper == null) {
throw new ELException(MessageFactory.get("error.fnMapper.null"));
}
Method m = fnMapper.resolveFunction(funcNode.getPrefix(), funcNode.getLocalName());
if (m == null) {
throw new ELException(
MessageFactory.get("error.fnMapper.method", funcNode.getOutputName()));
}
int pcnt = m.getParameterTypes().length;
if (node.jjtGetNumChildren() != pcnt) {
throw new ELException(
MessageFactory.get(
"error.fnMapper.paramcount",
funcNode.getOutputName(),
"" + pcnt,
"" + node.jjtGetNumChildren()));
}
} else if (node instanceof AstIdentifier && this.varMapper != null) {
String variable = ((AstIdentifier) node).getImage();
// simply capture it
this.varMapper.resolveVariable(variable);
}
}
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;
}
public MethodExpression createMethodExpression(
Class<?> expectedReturnType, Class<?>[] expectedParamTypes) throws ELException {
Node n = this.build();
if (!n.isParametersProvided() && expectedParamTypes == null) {
throw new NullPointerException(MESSAGES.nullParameterTypes());
}
if (n instanceof AstValue || n instanceof AstIdentifier) {
return new MethodExpressionImpl(
expression, n, this.fnMapper, this.varMapper, expectedReturnType, expectedParamTypes);
} else if (n instanceof AstLiteralExpression) {
return new MethodExpressionLiteral(expression, expectedReturnType, expectedParamTypes);
} else {
throw new ELException(MESSAGES.invalidMethodExpression(expression));
}
}
private void prepare(Node node) throws ELException {
try {
node.accept(this);
} catch (Exception e) {
if (e instanceof ELException) {
throw (ELException) e;
} else {
throw (new ELException(e));
}
}
if (this.fnMapper instanceof FunctionMapperFactory) {
this.fnMapper = ((FunctionMapperFactory) this.fnMapper).create();
}
if (this.varMapper instanceof VariableMapperFactory) {
this.varMapper = ((VariableMapperFactory) this.varMapper).create();
}
}
private static final Node createNodeInternal(String expr) throws ELException {
if (expr == null) {
throw new ELException(MESSAGES.errorNullExpression());
}
Node n = (cache != null) ? cache.get(expr) : unlimitedCache.get(expr);
if (n == null) {
try {
n = (new ELParser(new StringReader(expr))).CompositeExpression();
// validate composite expression
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(MESSAGES.errorMixedExpression(expr));
}
}
}
}
if (n instanceof AstDeferredExpression || n instanceof AstDynamicExpression) {
n = n.jjtGetChild(0);
}
if (cache != null) {
cache.put(expr, n);
} else {
unlimitedCache.put(expr, n);
}
} catch (Exception e) {
throw new ELException(MESSAGES.errorParse(expr), e);
}
}
return n;
}
private static final Node createNodeInternal(String expr) throws ELException {
if (expr == null) {
throw new ELException(MessageFactory.get("error.null"));
}
Node n = cache.get(expr);
if (n == 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);
}
cache.put(expr, n);
} catch (ParseException pe) {
throw new ELException("Error Parsing: " + expr, pe);
}
}
return n;
}