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The StockItem class s attributes are all validated For example, the productid attribute can be set only to a nonempty string that starts with three uppercase letters and ends with four digits, the category attribute can be set only to a nonempty string that is one of the speci ed values, and the quantity attribute can be set only to a number between 1 and 1 000 inclusive If we try to set an invalid value an exception is raised

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As an example, consider the straightforward implementation of a method to performs a mergesort in Java shown in Fig 529 The method takes a reference to the array to be sorted and sorts the elements with indices ranging from lo (inclusive) to hi (exclusive) Sorting the entire array A is done by invoking sort(A,0,Alength)

The validation is achieved by combining class decorators with descriptors As we noted earlier, class decorators can take only a single argument the class they are to decorate So here we have used the technique shown when we rst discussed class decorators, and have the valid_string() and valid_number() functions take whatever arguments we want, and then return a decorator, which in turn takes the class and returns a modi ed version of the class Let s now look at the valid_string() function:

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def valid_string(attr_name, empty_allowed=True, regex=None, acceptable=None): def decorator(cls): name = "__" + attr_name def getter(self): return getattr(self, name) def setter(self, value): assert isinstance(value, str), (attr_name + " must be a string") if not empty_allowed and not value: raise ValueError("{0} may not be empty"format( attr_name)) if ((acceptable is not None and value not in acceptable) or (regex is not None and not regexmatch(value))): raise ValueError("{attr_name} cannot be set to " "{value}"format(**locals())) setattr(self, name, value) setattr(cls, attr_name, GenericDescriptor(getter, setter)) return cls return decorator

This allows your customer service employees to see the data they are meant to see In addition, what if you need to add a sensitive piece of information to a table that not everyone needs to see For example, suppose you need to start storing all your customers social security numbers; you add a new column to tbl_customer called SSN Any users who currently have read access to the table can now see this new SSN column, whether or not you want them to have that access Extra steps need to be taken to prevent them from seeing the new data But when you use an abstraction layer, this problem ceases to exist Adding a column to a table does not automatically add it to your view, provided you didn t create your view using the SELECT * syntax Now the extra steps would be required to expose the data, and not to hide it To expose the information, you would need to modify any views you want this new column to appear in, or create new views

The function starts by creating a class decorator function which takes a class as its sole argument The decorator adds two attributes to the class it decorates: a private data attribute and a descriptor For example, when the valid_string()

static void sort(final int[] A,final int lo, final int hi) { int n = hi - lo; //if not large enough to do in parallel, sort sequentially if (n <= THRESHOLD){ Arrayssort(A,lo,hi); return; } else { //split array final int pivot = (hi+lo)/2; //create and start new thread to sort lower half Thread t = new Thread() { public void run() { sort(A, lo, pivot); } }; tstart(); //sort upper half in current thread sort(A,pivot,hi); //wait for other thread try{t join();} catch (InterruptedException e){ThreaddumpStack();} //merge sorted arrays int [] ws = new int [n] ; Systemarraycopy(A,lo,ws,0,n); int wpivot = pivot - lo; int wlo = 0; int whi = wpivot; for (int i = lo; i != hi; i++) { if((wlo < wpivot) && (whi >= n II ws[wlo] <= ws[whi])) { A[i] = ws[wlo++]; } else { A[i] = ws[whi++]; }

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