private boolean isScalarConstants(Expression expr1, Expression expr2) {
if ((expr1 instanceof Constant) && (expr2 instanceof Constant)) {
return (expr1.getResultStructure() == Expression.STRUCT_SCALAR)
&& (expr2.getResultStructure() == Expression.STRUCT_SCALAR);
} else {
return false;
}
}
private void fillObjectField(Object[] fields) {
int varargIndex = fields.length - 1;
Object[] array = new Object[exprs.size() - varargIndex];
for (int i = 0; i < exprs.size(); i++) {
Expression expr = exprs.get(i);
Object result = expr.eval();
if (i < varargIndex) {
fields[i] = result;
} else {
array[i - varargIndex] = result;
}
}
fields[varargIndex] = array;
}
private Expression simplify(UnaryExpression unary) {
Expression expr = unary.getExpression();
expr = simplify(expr);
if (unary instanceof ExprNOT) {
if (expr instanceof Constant) {
if (expr.equals(Constant.TRUE)) {
return Constant.FALSE;
} else if (expr.equals(Constant.FALSE)) {
return Constant.TRUE;
}
}
}
unary.setExpression(expr);
return unary;
}
private void fillIntField(Object[] fields) {
int varargIndex = fields.length - 1;
int[] array = new int[exprs.size() - varargIndex];
for (int i = 0; i < exprs.size(); i++) {
Expression expr = exprs.get(i);
Object result = expr.eval();
if (i < varargIndex) {
fields[i] = result;
} else {
if (result instanceof Float) {
array[i - varargIndex] = ((Float) result).intValue();
} else if (result instanceof Double) {
array[i - varargIndex] = ((Double) result).intValue();
} else {
array[i - varargIndex] = ((Integer) result).intValue();
}
}
}
fields[varargIndex] = array;
}
private Expression simplify(AryExpression ary) {
Expression expr1 = ary.getExpression1();
expr1 = simplify(expr1);
Expression expr2 = ary.getExpression2();
expr2 = simplify(expr2);
if (ary instanceof ExprADD) {
if (isScalarConstants(expr1, expr2)) {
if ((expr2.getResultType() == Expression.TYPE_INTEGER)
&& (expr1.getResultType() == Expression.TYPE_INTEGER)) {
Constant constant = new Constant(Expression.TYPE_INTEGER, Expression.STRUCT_SCALAR);
constant.setValue(expr1.evalAsInt() + expr2.evalAsInt());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_FLOAT)
|| (expr1.getResultType() == Expression.TYPE_FLOAT)) {
Constant constant = new Constant(Expression.TYPE_FLOAT, Expression.STRUCT_SCALAR);
constant.setValue(expr1.evalAsFloat() + expr2.evalAsFloat());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_NUMERIC)
|| (expr1.getResultType() == Expression.TYPE_NUMERIC)) {
Constant constant = new Constant(Expression.TYPE_NUMERIC, Expression.STRUCT_SCALAR);
constant.setValue(expr1.evalAsFloat() + expr2.evalAsFloat());
return constant;
} else {
return ary;
}
} else if ((expr1 instanceof Constant) || (expr2 instanceof Constant)) {
if (expr1.equals(Constant.ZERO_F)) {
return expr2;
} else if (expr1.equals(Constant.ZERO_I)) {
return expr2;
} else if (expr1.equals(Constant.EMPTY_STRING)) {
return expr2;
} else if (expr2.equals(Constant.ZERO_F)) {
return expr1;
} else if (expr2.equals(Constant.ZERO_I)) {
return expr1;
} else if (expr2.equals(Constant.EMPTY_STRING)) {
return expr1;
}
}
} else if (ary instanceof ExprSUB) {
if (isScalarConstants(expr1, expr2)) {
if ((expr2.getResultType() == Expression.TYPE_INTEGER)
&& (expr1.getResultType() == Expression.TYPE_INTEGER)) {
Constant constant = new Constant(Expression.TYPE_INTEGER, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsInt() - expr1.evalAsInt());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_FLOAT)
|| (expr1.getResultType() == Expression.TYPE_FLOAT)) {
Constant constant = new Constant(Expression.TYPE_FLOAT, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() - expr1.evalAsFloat());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_NUMERIC)
|| (expr1.getResultType() == Expression.TYPE_NUMERIC)) {
Constant constant = new Constant(Expression.TYPE_NUMERIC, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() - expr1.evalAsFloat());
return constant;
} else {
return ary;
}
} else if (expr1 instanceof Constant) {
if (expr1.equals(Constant.ZERO_F)) {
return expr2;
} else if (expr1.equals(Constant.ZERO_I)) {
return expr2;
}
}
} else if (ary instanceof ExprMULT) {
if (isScalarConstants(expr1, expr2)) {
if ((expr2.getResultType() == Expression.TYPE_INTEGER)
&& (expr1.getResultType() == Expression.TYPE_INTEGER)) {
Constant constant = new Constant(Expression.TYPE_INTEGER, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsInt() * expr1.evalAsInt());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_FLOAT)
|| (expr1.getResultType() == Expression.TYPE_FLOAT)) {
Constant constant = new Constant(Expression.TYPE_FLOAT, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() * expr1.evalAsFloat());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_NUMERIC)
|| (expr1.getResultType() == Expression.TYPE_NUMERIC)) {
Constant constant = new Constant(Expression.TYPE_NUMERIC, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() * expr1.evalAsFloat());
return constant;
} else {
return ary;
}
} else if ((expr1 instanceof Constant) || (expr2 instanceof Constant)) {
if (expr1.equals(Constant.ZERO_F)) {
return Constant.ZERO_F;
} else if (expr1.equals(Constant.ZERO_I)) {
return Constant.ZERO_I;
} else if (expr2.equals(Constant.ZERO_F)) {
return Constant.ZERO_F;
} else if (expr2.equals(Constant.ZERO_I)) {
return Constant.ZERO_I;
} else if (expr1.equals(Constant.ONE_F)) {
return expr2;
} else if (expr1.equals(Constant.ONE_I)) {
return expr2;
} else if (expr2.equals(Constant.ONE_F)) {
return expr1;
} else if (expr2.equals(Constant.ONE_I)) {
return expr1;
}
}
} else if (ary instanceof ExprDIV) {
if (isScalarConstants(expr1, expr2)) {
if ((expr2.getResultType() == Expression.TYPE_INTEGER)
&& (expr1.getResultType() == Expression.TYPE_INTEGER)) {
Constant constant = new Constant(Expression.TYPE_FLOAT, Expression.STRUCT_SCALAR);
constant.setValue((float) expr2.evalAsInt() / (float) expr1.evalAsInt());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_FLOAT)
|| (expr1.getResultType() == Expression.TYPE_FLOAT)) {
Constant constant = new Constant(Expression.TYPE_FLOAT, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() / expr1.evalAsFloat());
return constant;
} else if ((expr2.getResultType() == Expression.TYPE_NUMERIC)
|| (expr1.getResultType() == Expression.TYPE_NUMERIC)) {
Constant constant = new Constant(Expression.TYPE_NUMERIC, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsFloat() / expr1.evalAsFloat());
return constant;
} else {
return ary;
}
} else if ((expr1 instanceof Constant) || (expr2 instanceof Constant)) {
if (expr1.equals(Constant.ONE_F)) {
return expr2;
} else if (expr1.equals(Constant.ONE_I)) {
return expr2;
} else if (expr2.equals(Constant.ZERO_F)) {
return Constant.ZERO_F;
} else if (expr2.equals(Constant.ZERO_I)) {
return Constant.ZERO_I;
}
}
} else if (ary instanceof ExprAND) {
if ((expr1 instanceof Constant) && (expr2 instanceof Constant)) {
((Constant) expr1).setValue(expr2.evalAsBoolean() && expr1.evalAsBoolean());
return expr1;
} else if ((expr1 instanceof Constant) || (expr2 instanceof Constant)) {
if (expr1.equals(Constant.TRUE)) {
return expr2;
} else if (expr1.equals(Constant.FALSE)) {
return Constant.FALSE;
} else if (expr2.equals(Constant.TRUE)) {
return expr1;
} else if (expr2.equals(Constant.FALSE)) {
return Constant.FALSE;
}
}
} else if (ary instanceof ExprOR) {
if (isScalarConstants(expr1, expr2)) {
Constant constant = new Constant(Expression.TYPE_BOOL, Expression.STRUCT_SCALAR);
constant.setValue(expr2.evalAsBoolean() || expr1.evalAsBoolean());
return constant;
} else if ((expr1 instanceof Constant) || (expr2 instanceof Constant)) {
if (expr1.equals(Constant.TRUE)) {
return Constant.TRUE;
} else if (expr1.equals(Constant.FALSE)) {
return Constant.FALSE;
} else if (expr2.equals(Constant.TRUE)) {
return Constant.TRUE;
} else if (expr2.equals(Constant.FALSE)) {
return Constant.FALSE;
}
}
}
ary.setExpression1(expr1);
ary.setExpression2(expr2);
return ary;
}
@Override
public final Object eval() throws ArithmeticException {
FunctionsDefinitions def = FunctionsDefinitions.getInstance();
Function function = def.getFunction(key);
if (function == null) {
throw new ArithmeticException(
"Function " + key.getName() + "( " + key.getParamsSize() + " parameters) does not exist");
} else {
Method method = function.getMethod();
if (fields == null) {
initFieldsArray(function, method);
}
Object obj = function.getObject();
if (varargs) {
Class clazz = method.getParameterTypes()[fields.length - 1];
Class ctype = getVarargType(clazz);
if (ctype == Integer.TYPE) {
fillIntField(fields);
} else if (ctype == Float.TYPE) {
fillFloatField(fields);
} else {
fillObjectField(fields);
}
} else {
for (int i = 0; i < exprs.size(); i++) {
Expression expr = exprs.get(i);
Object _f = null;
if (expr.getResultType() == TYPE_INTEGER) {
_f = getField(expr.evalAsInt(), method.getParameterTypes()[i]);
} else if (expr.getResultType() == TYPE_FLOAT) {
_f = getField(expr.evalAsFloat(), method.getParameterTypes()[i]);
} else if (expr.getResultType() == TYPE_BOOL) {
_f = getField(expr.evalAsBoolean(), method.getParameterTypes()[i]);
} else {
_f = getField(expr.eval(), method.getParameterTypes()[i]);
}
fields[i] = _f;
}
}
try {
Object result = null;
if (varargs) {
result = method.invoke(obj, fields);
} else {
result = method.invoke(obj, fields);
}
if (method.getReturnType() == Integer.TYPE) {
return result;
} else if (method.getReturnType() == Short.TYPE) {
return ((Short) result).intValue();
} else if (method.getReturnType() == Double.TYPE) {
return ((Double) result).floatValue();
} else if (method.getReturnType() == Float.TYPE) {
Float f = (Float) result;
if (f.isInfinite()) {
throw newArithmeticException(function);
}
return f;
} else if (method.getReturnType() == Boolean.TYPE) {
return ((Boolean) result).booleanValue();
} else {
return result;
}
} catch (IllegalAccessException ex) {
ArithmeticException e =
new ArithmeticException("IllegalAccessException for function " + function.getName());
throw e;
} catch (IllegalArgumentException ex) {
ArithmeticException e =
new ArithmeticException("Illegal argument for function " + function.getName());
throw e;
} catch (InvocationTargetException ex) {
Throwable _ex = ex.getCause();
String message = null;
if (_ex != null) {
message = "Exception in function " + function.getName() + " (" + _ex.getMessage() + ")";
} else {
message = "Exception in function " + function.getName();
}
ArithmeticException e = new ArithmeticException(message);
e.initCause(_ex);
e.setStackTrace(_ex.getStackTrace());
throw e;
}
}
}