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When we pass a predicate to remove_copy_if, we are asking it "remove" each element that satisfies the predicate In this context, "removing" an element means not copying it, so we copy only those elements that do not satisfy the predicate Therefore, passing pgrade to remove_copy_if copies only the student records with failing grades The next statement is somewhat complicated First, we call remove_if to "remove" the elements that correspond to failing grades Again, the quotes around "remove" are because nothing is actually removed Instead, remove_if copies all the elements that do not satisfy the predicate in this case, all the student records with passing grades This call is tricky to understand because remove_if uses the same sequence as its source and destination What it

A content provider is another common adapter type used in list viewers This provider is used to map between a domain model object or a collection of

Cheese[] cheeses = shopgetCheeses(); if (cheeses != null && ArraysasList(shopgetCheeses())contains(CheeseSTILTON)) Systemoutprintln("Jolly good, just the thing");

domain model objects used as the input to the viewer and the internal list structure needed by the viewer itself The two most common types of content providers are IStructuredContentProvider, used in lists and tables, and ITreeContentProvider, used in trees (see Figure 5 4) The former maps a domain model input into an array while the latter adds support for retrieving an item s parent or children within a tree A content provider is associated with a viewer using the setContentProvider() method A domain model input is associated with a viewer using the setInput() method

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really does is copy to the beginning of the sequence the elements that don't meet the predicate For example, suppose we started with seven students with grades as follows:

Useful APIs defined by IStructuredContentProvider include:

Then the call to remove_if would leave the first two records untouched, because they're already in the right places It would "remove" the next two records by treating them as free space to be overwritten by the next records that should be kept So, when it sees the fifth record, which represents a student who passed, it would copy that record into the now free position that used to hold the first of the "removed" failing records, and so on:

getElements(Object) Returns the elements to display in the viewer when its input is set to the given element inputChanged(Viewer, Object, Object) Notifies this content provider that the given viewer s input has been switched to a different element

Useful APIs added by ITreeContentProvider include:

instead of:

The result in this case would be to copy the four passing records to the beginning of the sequence, leaving the remaining three records untouched So that we can know how much of the sequence is still relevant, remove_if returns an iterator that refers to one past the last element that it did not "remove":

Object[] getChildren(Object) Returns the child elements of the given parent element The difference between this method and the previously listed getElements(Object) method is that it is called to obtain the tree viewer s root elements, whereas getChildren(Object) is used to obtain the children of a given parent element in the tree (including a root) getParent(Object) Returns either the parent for the given element or null, indicating that the parent can t be computed hasChildren(Object) Returns whether the given element has chil-

A viewer sorter (see Figure 5 5 for the ViewerSorter hierarchy) is used to sort the elements provided by the content provider (see Figure 5 1) If a viewer does not have a viewer sorter, the elements are shown in the order returned by the content provider A viewer sorter is associated with a viewer using the setSorter() method

Next, we need to erase these unneeded records from students We have not used this version of erase before It takes two iterators, and erases all the elements in the range delimited by those iterators If we erase the elements between the iterator returned from the call to remove_if and studentsend(), we are left with just the passing records:

The default sorting algorithm uses a two-step process First, it groups elements into categories (ranked 0 through n); and second, it sorts each category based on the text labels returned by the label provider By default, all items are in the same category, so all the items are sorted relative to their text labels Your application can override the default categorization as well as the default comparison routine to use some criteria other than the item s text label Useful APIs defined by ViewerSorter include:

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