/**
* @param expr
* @return
*/
public static Expr negate(Expr expr) {
if (expr instanceof ConstExpr) {
ConstExpr ce = (ConstExpr) expr;
JsonValue t = ce.value;
if (t instanceof JsonLong) {
return new ConstExpr(new JsonLong(-((JsonLong) t).get()));
}
if (t instanceof MutableJsonLong) {
((MutableJsonLong) t).negate();
return expr;
}
if (t instanceof JsonDouble) {
return new ConstExpr(new JsonDouble(-((JsonDouble) t).get()));
}
if (t instanceof MutableJsonDouble) {
((MutableJsonDouble) t).negate();
return expr;
}
if (t instanceof JsonDecimal) {
return new ConstExpr(new JsonDecimal(((JsonDecimal) t).get().negate()));
}
if (t instanceof MutableJsonDecimal) {
((MutableJsonDecimal) t).negate();
return expr;
}
}
return new MathExpr(MathExpr.MINUS, new ConstExpr(JsonLong.ZERO), expr);
}
/*
* (non-Javadoc)
*
* @see com.ibm.jaql.json.meta.MetaAccessor#get(java.lang.Object,
* com.ibm.jaql.json.type.Item)
*/
@Override
public JsonValue get(Object obj, JsonValue target)
throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
double x = (Double) getter.invoke(obj);
((MutableJsonDouble) target).set(x);
return target;
}