/**
* Sets the value of a complex reference (something like $foo.bar) Currently used by
* ASTSetReference()
*
* @see ASTSetDirective
* @param context context object containing this reference
* @param value Object to set as value
* @return true if successful, false otherwise
* @throws MethodInvocationException
*/
public boolean setValue(InternalContextAdapter context, Object value)
throws MethodInvocationException {
if (jjtGetNumChildren() == 0) {
context.put(rootString, value);
return true;
}
/*
* The rootOfIntrospection is the object we will
* retrieve from the Context. This is the base
* object we will apply reflection to.
*/
Object result = getVariableValue(context, rootString);
if (result == null) {
String msg = "reference set is not a valid reference at " + Log.formatFileString(uberInfo);
log.error(msg);
return false;
}
/*
* How many child nodes do we have?
*/
for (int i = 0; i < numChildren - 1; i++) {
result = jjtGetChild(i).execute(result, context);
if (result == null) {
if (strictRef) {
String name = jjtGetChild(i + 1).getFirstToken().image;
throw new MethodInvocationException(
"Attempted to access '" + name + "' on a null value",
null,
name,
uberInfo.getTemplateName(),
jjtGetChild(i + 1).getLine(),
jjtGetChild(i + 1).getColumn());
}
String msg = "reference set is not a valid reference at " + Log.formatFileString(uberInfo);
log.error(msg);
return false;
}
}
if (astIndex != null) {
// If astIndex is not null then we are actually setting an index reference,
// something of the form $foo[1] =, or in general any reference that ends with
// the brackets. This means that we need to call a more general method
// of the form set(Integer, <something>), or put(Object, <something), where
// the first parameter is the index value and the second is the LHS of the set.
Object argument = astIndex.jjtGetChild(0).value(context);
// If negative, turn -1 into (size - 1)
argument = ASTIndex.adjMinusIndexArg(argument, result, context, astIndex);
Object[] params = {argument, value};
Class[] paramClasses = {
params[0] == null ? null : params[0].getClass(),
params[1] == null ? null : params[1].getClass()
};
String methodName = "set";
VelMethod method =
ClassUtils.getMethod(methodName, params, paramClasses, result, context, astIndex, false);
if (method == null) {
// If we can't find a 'set' method, lets try 'put', This warrents a little
// investigation performance wise... if the user is using the hash
// form $foo["blaa"], then it may be expensive to first try and fail on 'set'
// then go to 'put'? The problem is that getMethod will try the cache, then
// perform introspection on 'result' for 'set'
methodName = "put";
method =
ClassUtils.getMethod(
methodName, params, paramClasses, result, context, astIndex, false);
}
if (method == null) {
// couldn't find set or put method, so bail
if (strictRef) {
throw new VelocityException(
"Found neither a 'set' or 'put' method with param types '("
+ printClass(paramClasses[0])
+ ","
+ printClass(paramClasses[1])
+ ")' on class '"
+ result.getClass().getName()
+ "' at "
+ Log.formatFileString(astIndex));
}
return false;
}
try {
method.invoke(result, params);
} catch (RuntimeException e) {
// Kludge since invoke throws Exception, pass up Runtimes
throw e;
} catch (Exception e) {
throw new MethodInvocationException(
"Exception calling method '"
+ methodName
+ "("
+ printClass(paramClasses[0])
+ ","
+ printClass(paramClasses[1])
+ ")' in "
+ result.getClass(),
e.getCause(),
identifier,
astIndex.getTemplateName(),
astIndex.getLine(),
astIndex.getColumn());
}
return true;
}
/*
* We support two ways of setting the value in a #set($ref.foo = $value ) :
* 1) ref.setFoo( value )
* 2) ref,put("foo", value ) to parallel the get() map introspection
*/
try {
VelPropertySet vs = rsvc.getUberspect().getPropertySet(result, identifier, value, uberInfo);
if (vs == null) {
if (strictRef) {
throw new MethodInvocationException(
"Object '"
+ result.getClass().getName()
+ "' does not contain property '"
+ identifier
+ "'",
null,
identifier,
uberInfo.getTemplateName(),
uberInfo.getLine(),
uberInfo.getColumn());
} else {
return false;
}
}
vs.invoke(result, value);
} catch (InvocationTargetException ite) {
/*
* this is possible
*/
throw new MethodInvocationException(
"ASTReference : Invocation of method '"
+ identifier
+ "' in "
+ result.getClass()
+ " threw exception "
+ ite.getTargetException().toString(),
ite.getTargetException(),
identifier,
getTemplateName(),
this.getLine(),
this.getColumn());
}
/** pass through application level runtime exceptions */
catch (RuntimeException e) {
throw e;
} catch (Exception e) {
/*
* maybe a security exception?
*/
String msg =
"ASTReference setValue() : exception : "
+ e
+ " template at "
+ Log.formatFileString(uberInfo);
log.error(msg, e);
throw new VelocityException(msg, e);
}
return true;
}
/**
* This method helps to implement the "render literal if null" functionality.
*
* <p>VelocimacroProxy saves references to macro arguments (AST nodes) so that if we have a macro
* #foobar($a $b) then there is key "$a.literal" which points to the literal presentation of the
* argument provided to variable $a. If the value of $a is null, we render the string that was
* provided as the argument.
*
* @param context
* @return
*/
private String getNullString(InternalContextAdapter context) {
Object callingArgument = context.get(".literal." + nullString);
if (callingArgument != null) return ((Node) callingArgument).literal();
else return nullString;
}