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CHAPTER 16 COLLECTION PATTERNS
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Creates an immutable set containing a single object. Creates an immutable set containing the objects in the variable argument list. The list is terminated by a nil object value. Creates an immutable set from a C array of object pointers. The parameters are the address of the first element in the array and the element count. Creates a new immutable set that s a shallow copy of the receiver plus one additional object. Creates a new immutable set that s a union of the receiver s set and the parameter set. Creates a new immutable set that s a union of the receiver s set and the objects in the array. Creates a new immutable set containing the objects in the receiver s set that match the predicate expression. Creates an immutable index set containing a single index. Creates an immutable index set with all of the indexes in the given range. Creates an immutable index set that s a copy of another index set.
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Collections created from other collections usually make shallow copies of the original collection, by simply copying the object pointers. This is highly optimized and is usually very fast. It is quite common to create a mutable collection to assemble a set of objects, and then return an immutable copy, as shown in Listing 16-1. This is comparable to creating a java.lang.StringBuilder object, building the string, then returning an immutable String via StringBuilder.toString().
Listin g 16-1. Returning an Immutable Collection
- (NSArray*)guestList { // Assemble array of guests NSMutableArray *scratchArray = [NSMutableArray new];
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CHAPTER 16 COLLECTION PATTERNS
for ( ) { [scratchArray addObject: ]; } // Return immutable array of guests return [NSArray arrayWithArray:scratchArray]; } A few constructors make deep copies. These have a copyItems parameter. When dictionaries are duplicated, the key objects are always copied. Since the mutable subclasses inherit all of the methods of their superclass, the mutable collection classes can use any of the class methods in Table 16-2 to pre-populate a new, mutable collection. You typically do this when you have an immutable collection that you need to make changes to, as shown in Listing 16-2.
Listin g 16-2. Creating a Mutable Copy of an Immutable Collection
- (void)hardwareNotification:(NSNotification*)notification { NSDictionary *hwInfo = [notification userInfo]; // details of hardware problem NSMutableDictionary *adminInfo = nil; // If the hardware alert is serious enough to notify the administrators, // post a new notification with the hardware failure and a time stamp. int alertLevel = [[hwInfo objectForKey:@"Level"] intValue]; if (alertLevel>=notifyAlertLevel) { // Make a mutable copy of the hardware failure info dictionary adminInfo = [NSMutableDictionary dictionaryWithDictionary:hwInfo]; // Add a time stamp to the hardware info dictionary [adminInfo setObject:[NSDate date] forKey:@"Date"]; [[NSNotificationCenter defaultCenter] postNotificationName:@"AdminAlert" object:[notification object] userInfo:adminInfo]; } } Objective-C has recently acquired some new collection classes: NSPointerArray, NSMapTable, and NSHashTable. These classes are inherently mutable and are more like the Java collection classes in that respect. They all have the ability to be programmed with a particular personality, such as maintaining weak references to objects, allowing memory blocks or primitive integers to be used as values, or permitting nil object pointers to be stored. The differences between these new classes and the old ones are detailed in the sections that discuss them.
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CHAPTER 16 COLLECTION PATTERNS
Ordered Collections
NSArray, NSMutableArray, and NSPointerArray organize ordered collections of values, equivalent to java.util.ArrayList. Specifically, Objective-C and Java array classes have these common features: Values in the collection are object references. Values are addressed by index. The same value can be stored at more than one index. New values can be appended to the end of the array, or inserted at an existing index pushing existing values up one index. Values cannot be inserted beyond the end of the array. Removing a value shifts all subsequent values down to occupy the vacated index. NSArray collections can be searched to locate the index of a known value. There are a number of key differences: NSArray objects cannot be used to store nil (null) values. Consequently, operations that would pad the array with nil values, like -setCount:, are not implemented. NSPointerArray objects will not search their content for values. Thus, methods like -containsObject, indexOfObject:, and removeObject: are not implemented. You can iterate over its content to find values. NSPointerArray can store much more than object pointer values. An NSMutableArray can be initialized with a predetermined capacity. But beyond that, the capacity of the array is opaque, save for the single -compact method implemented by NSPointerArray.
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