private Expression getCompileTimeConstantExpression() {
// Must be static constant
if (!isStatic() || !isFinal()) {
return null;
}
IType type = getFeatureType();
// Must be either primitive, String, or Enum constant
if (type != JavaTypes.STRING() && !type.isPrimitive() && !type.isEnum()) {
return null;
}
//
// Field must be initialized directly
//
if (getOwnersType().isDeclarationsCompiled()) {
getOwnersType().isValid(); // barf
}
for (VarStatement varStmt : getOwnersType().getParseInfo().getStaticFields().values()) { // barf
if (varStmt.getIdentifierName().toString().equals(getName())) {
Expression initiazerExpr = varStmt.getAsExpression();
if (initiazerExpr != null) {
return varStmt.isEnumConstant() || initiazerExpr.isCompileTimeConstant()
? initiazerExpr
: null;
}
}
}
return null;
}
@Override
public Object doCompileTimeEvaluation() {
Expression expr = getCompileTimeConstantExpression();
return expr instanceof INewExpression
? getName() // Enum constant field name
: expr.evaluate();
}
