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If this type check were missing and the equals method were passed an argument of the wrong type, the equals method would throw a ClassCastException, which violates the equals contract But the instanceof operator is specified to return false if its first operand is null, regardless of what type appears in the second operand [JLS, 15192] Therefore the type check will return false if null is passed in, so you don't need a separate null check Putting it all together, here's a recipe for a high-quality equals method: 1 Use the == operator to check if the argument is a reference to this object If so, return true This is just a performance optimization, but one that is worth doing if the comparison is potentially expensive 2 Use the instanceof operator to check if the argument is of the correct type If not, return false Typically, the correct type is the class in which the method occurs Occasionally, it is some interface implemented by this class Use an interface if the class implements an interface that refines the equals contract to permit comparisons across classes that implement the interface The collection interfaces Set, List, Map, and MapEntry have this property 3 Cast the argument to the correct type Because this cast was preceded by an instanceof test, it is guaranteed to succeed 4 For each significant field in the class, check to see if that field of the argument matches the corresponding field of this object If all these tests succeed, return true; otherwise, return false If the type in Step 2 is an interface, you must access the argument's significant fields via interface methods; if the type is a class, you may be able to access the fields directly, depending on their accessibility For primitive fields whose type is not float or double, use the == operator for comparisons; for object reference fields, invoke the equals method recursively; for float fields, translate to int values using FloatfloatToIntBits and compare the int values using the == operator; for double fields, translate to long values using DoubledoubleToLongBits and compare the long values using the == operator (The special treatment of float and double fields is made necessary by the existence of FloatNaN, -00f, and the analogous double constants; see the Floatequals documentation for details) For array fields, apply these guidelines to each element Some object reference fields may legitimately contain null To avoid the possibility of a NullPointerException, use the following idiom to compare such fields:.

For the content provider, use the built-in ArrayContentProvider class that maps an input collection to an array The input object is set using the setInput() method The viewer sorter defines a custom compare() method that sorts the elements based on a person s last name Finally, a selectionChanged listener and a doubleClick listener are added that override the selectionChanged() method and the doubleClick() method, respectively

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The TableViewer class wraps the Table widget A table viewer provides an editable, vertical, multicolumn list of items, which shows a row of cells for each item in the list where each cell represents a different attribute of the item at that row A table viewer needs to be configured with a label provider, a content provider, and a set of columns The CheckboxTableViewer enhances this further by adding support for graying out individual items and toggling on and off an associated checkbox with each item Useful APIs include:

// Example implementation of standard-library function size_t strlen(const char* p) { size_t size = 0; while (*p++ != '\0') ++size; return size; }

add(Object) Adds the given element to this table viewer This method should be called (by the content provider) when a single element has been added to the model to cause the viewer to accurately reflect the model This method only affects the viewer, not the model add(Object[]) Adds the given elements to this table viewer This method should be called (by the content provider) when elements have been added to the model to cause the viewer to accurately reflect the model This method only affects the viewer, not the model

Recall from 1013/174 that size_t is an unsigned integral type that is appropriate to contain the size of any array, which makes it the appropriate type for size The strlen function counts characters in the array denoted by p up to but not including the null Because the variable hello has the same meaning as the string literal "Hello",

editElement(Object, int) Starts editing the given element getElementAt(int) Returns the element with the given index from

(field == null ofield == null : fieldequals(ofield))

getTable() Returns this table viewer s table control insert(Object, int) Inserts the given element into this table viewer

string s(hello);

remove(Object) Removes the given element from this table viewer This method should be called (by the content provider) when a single element has been removed from the model to cause the viewer to accurately reflect the model This method only affects the viewer, not the model remove(Object[]) Removes the given elements from this table

viewer This method should be called (by the content provider) when elements have been removed from the model in order to cause the viewer to accurately reflect the model This method only affects the viewer, not the model

will define a string variable named s that contains a copy of the characters stored in hello, just as

reveal(Object) Ensures that the given element is visible, scrolling the viewer if necessary setCellEditors(CellEditor[]) Sets the cell editors of this table

This alternative may be faster if field and ofield are often identical object references:

string s("Hello");

setLabelProvider(IBaseLabelProvider) The table viewer implementation of this Viewer framework method ensures that the given label provider is an instance of either ITableLabelProvider or ILabelProvider

The CheckboxTableViewer adds the following useful APIs:

defines a string variable named s that contains a copy of the characters in "Hello" Moreover, because we can construct a string from two iterators, we can also write

addCheckStateListener(ICheckStateListener) Adds a listener for changes to the checked state of elements in this viewer

getChecked(Object) Returns the checked state of the given element getCheckedElements() Returns a list of elements corresponding to

string s(hello, hello + strlen(hello));

(field == ofield || (field != null && fieldequals(ofield)))

getGrayed(Object) Returns the grayed state of the given element getGrayedElements() Returns a list of elements corresponding to grayed nodes in this viewer setAllChecked(boolean) Sets to the given value the checked state for all elements in this viewer setAllGrayed(boolean) Sets to the given value the grayed state for

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