mirror of
https://github.com/gnustep/libs-base.git
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* Source/NSKeyValueCoding.m: Added documentation.
* Source/NSKeyValueCoding.m ([NSObject -takeValue:forKey:]),
([NSObject -valueForKey:]): Corrected search order of instance
variables.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@16271 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
David Ayers
parent
f249b4c6a3
commit
7d885b66c8
2 changed files with 185 additions and 4 deletions
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@ -1,3 +1,10 @@
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2003-03-26 David Ayers <d.ayers@inode.at>
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* Source/NSKeyValueCoding.m: Added documentation.
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* Source/NSKeyValueCoding.m ([NSObject -takeValue:forKey:]),
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([NSObject -valueForKey:]): Corrected search order of instance
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variables.
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2003-03-25 Stephane Corthesy <stephane@sente.ch>
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* macosx: New directory holding MacOSX project for building
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@ -48,16 +48,36 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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*/
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@implementation NSObject (KeyValueCoding)
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/**
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* Controls whether the NSKeyValueCoding methods may attempt to
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* access instance variables directly.
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* NSObject's implementation returns YES.
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*/
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+ (BOOL) accessInstanceVariablesDirectly
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{
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return YES;
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}
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/**
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* Controls whether [NSObject-storedValueForKey:] and
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* [NSObject-takeStoredValueForKey:] may use the stored accessor mechainsm.
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* If not the calls get redirected to [NSObject-valueForKey:] and
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* [NSObject-takeValueForKey:] effectively changing the search order
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* of private/public accessor methods and instance variables.
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*/
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+ (BOOL) useStoredAccessor
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{
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return YES;
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}
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/**
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* Invoked when [NSObject-valueForKey:]/[NSObject-storedValueForKey:] are
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* called with a key, which can't be associated with an accessor method or
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* instance variable. Subclasses may override this method to add custom
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* handling. NSObject raises an NSUnknownKeyException, with a userInfo
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* dictionary containing NSTargetObjectUserInfoKey with the receiver
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* an NSUnknownUserInfoKey with the supplied key entries.
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*/
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- (id) handleQueryWithUnboundKey: (NSString*)aKey
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{
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NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
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@ -73,6 +93,15 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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return nil;
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}
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/**
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* Invoked when
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* [NSObject-takeValue:forKey:]/[NSObject-takeStoredValue:forKey:] are
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* called with a key which can't be associated with an accessor method or
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* instance variable. Subclasses may override this method to add custom
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* handling. NSObject raises an NSUnknownKeyException, with a userInfo
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* dictionary containing NSTargetObjectUserInfoKey with the receiver
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* an NSUnknownUserInfoKey with the supplied key entries.
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*/
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- (void) handleTakeValue: (id)anObject forUnboundKey: (NSString*)aKey
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{
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NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
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@ -87,6 +116,35 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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[exp raise];
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}
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/**
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* Returns the value associated with the supplied key as an object.
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* Scalar attributes are converted to corresponding objects.
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* The storedValue-NSKeyValueCoding use the private accessors
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* in favor of the public ones, if the receiver's class allows
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* [NSObject+useStoredAccessor]. Otherwise this method invokes
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* [NSObject-valueForKey:].
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* The search order is:<\br>
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* Private accessor methods:
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* <list>
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* <item>_getKey</item>
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* <item>_key</item>
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* </list>
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* If the receiver's class allows [NSObject+accessInstanceVariablesDirectly]
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* it continues with instance variables:
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* <list>
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* <item>_key</item>
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* <item>key</item>
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* </list>
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* Public accessor methods:
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* <list>
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* <item>getKey</item>
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* <item>key</item>
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* </list>
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* Invokes [NSObject-handleQueryWithUnboundKey:]
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* if no accessor mechanism can be found
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* and raises NSInvalidArgumentException if the accesor method takes
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* any arguments or the type is unsupported (e.g. structs).
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*/
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- (id) storedValueForKey: (NSString*)aKey
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{
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unsigned size;
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@ -165,6 +223,36 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* Sets the value associated with the supplied in the receiver.
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* The object is converted to the scalar attribute where applicable.
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* The storedValue-NSKeyValueCoding use the private accessors
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* in favor of the public ones, if the receiver's class allows
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* [NSObject+useStoredAccessor.]
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* Otherwise this method invokes [NSObject-takeValue:forKey:].
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* The search order is:<\br>
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* Private accessor methods:
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* <list>
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* <item>_setKey:</item>
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* </list>
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* If the receiver's class allows [NSObject+accessInstanceVariablesDirectly]
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* it continues with instance variables:
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* <list>
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* <item>_key</item>
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* <item>key</item>
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* </list>
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* Public accessor methods:
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* <list>
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* <item>setKey:</item>
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* </list>
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* Invokes [NSObject-handleTakeValue:forUnboundKey:]
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* if no accessor mechanism can be found
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* and raises NSInvalidArgumentException if the accesor method doesn't take
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* exactly one argument or the type is unsupported (e.g. structs).
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* If the receiver expects a scalar value and the value supplied
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* is the NSNull instance or nil, this method invokes
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* [NSObject-unableToSetNilForKey:].
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*/
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- (void) takeStoredValue: (id)anObject forKey: (NSString*)aKey
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{
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unsigned size;
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@ -234,6 +322,10 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* Iterates over the dictionary invoking [NSObject-takeStoredValue:forKey:]
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* on the receiver for each key-value pair, converting NSNull to nil.
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*/
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- (void) takeStoredValuesFromDictionary: (NSDictionary*)aDictionary
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{
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NSEnumerator *enumerator = [aDictionary keyEnumerator];
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@ -252,6 +344,31 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* Sets the value if the attribute associated with the key in the receiver.
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* The object is converted to a scalar attribute where applicable.
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* The value-NSKeyValueCoding use the public accessors
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* in favor of the private ones.
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* The search order is:<\br>
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* Accessor methods:
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* <list>
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* <item>setKey:</item>
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* <item>_setKey:</item>
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* </list>
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* If the receiver's class allows [NSObject+accessInstanceVariablesDirectly]
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* it continues with instance variables:
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* <list>
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* <item>key</item>
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* <item>_key</item>
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* </list>
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* Invokes [NSObject-handleTakeValue:forUnboundKey:]
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* if no accessor mechanism can be found
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* and raises NSInvalidArgumentException if the accesor method doesn't take
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* exactly one argument or the type is unsupported (e.g. structs).
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* If the receiver expects a scalar value and the value supplied
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* is the NSNull instance or nil, this method invokes
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* [NSObject-unableToSetNilForKey:].
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*/
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- (void) takeValue: (id)anObject forKey: (NSString*)aKey
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{
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unsigned size;
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@ -295,10 +412,10 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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buf[size+4] = '\0';
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buf[3] = '_';
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buf[4] = lo;
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name = &buf[3]; // _key
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name = &buf[4]; // key
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if (GSObjCFindVariable(self, name, &type, &size, &off) == NO)
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{
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name = &buf[4]; // key
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name = &buf[3]; // _key
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GSObjCFindVariable(self, name, &type, &size, &off);
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}
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}
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@ -308,6 +425,15 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* Retrieves the object returned by invoking [NSObject-valueForKey:]
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* on the receiver with the first key component supplied by the key path.
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* Then invokes [NSObject-takeValue:forKeyPath:] recursively on the
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* returned object with rest of the key path.
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* The key components are delimated by '.'.
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* If the key path doesn't contain any '.', this method simply
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* invokes [NSObject-takeValue:forKey:].
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*/
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- (void) takeValue: (id)anObject forKeyPath: (NSString*)aKey
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{
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NSRange r = [aKey rangeOfString: @"."];
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@ -325,6 +451,10 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* Iterates over the dictionary invoking [NSObject-takeValue:forKey:]
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* on the receiver for each key-value pair, converting NSNull to nil.
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*/
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- (void) takeValuesFromDictionary: (NSDictionary*)aDictionary
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{
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NSEnumerator *enumerator = [aDictionary keyEnumerator];
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@ -343,6 +473,12 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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}
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}
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/**
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* This method is invoked by the NSKeyValueCoding mechanism when an attempt
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* is made to set an null value for a scalar attribute. This implementation
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* raises an NSInvalidArgument exception. Subclasses my override this method
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* to do custom handling. (E.g. setting the value to the equivalent of 0.)
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*/
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- (void) unableToSetNilForKey: (NSString*)aKey
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{
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[NSException raise: NSInvalidArgumentException
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@ -350,6 +486,30 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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NSStringFromSelector(_cmd), NSStringFromClass([self class]), self, aKey];
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}
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/**
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* Returns the value associated with the supplied key as an object.
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* Scalar attributes are converted to corresponding objects.
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* The value-NSKeyValueCoding use the public accessors
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* in favor of the privat ones.
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* The search order is:<\br>
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* Accessor methods:
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* <list>
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* <item>getKey</item>
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* <item>key</item>
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* <item>_getKey</item>
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* <item>_key</item>
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* </list>
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* If the receiver's class allows accessInstanceVariablesDirectly
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* it continues with instance variables:
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* <list>
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* <item>key</item>
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* <item>_key</item>
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* </list>
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* Invokes [NSObject-handleQueryWithUnboundKey:]
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* if no accessor mechanism can be found
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* and raises NSInvalidArgumentException if the accesor method takes
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* any arguments or the type is unsupported (e.g. structs).
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*/
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- (id) valueForKey: (NSString*)aKey
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{
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unsigned size;
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@ -407,10 +567,10 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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{
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buf[4] = lo;
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buf[3] = '_';
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name = &buf[3]; // _key
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name = &buf[4]; // key
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if (GSObjCFindVariable(self, name, &type, &size, &off) == NO)
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{
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name = &buf[4]; // key
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name = &buf[3]; // _key
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GSObjCFindVariable(self, name, &type, &size, &off);
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}
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}
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}
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}
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/**
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* Retuns the object returned by invoking [NSObject-valueForKeyPath:]
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* recursively on the object returned by invoking [NSObject-valueForKey:]
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* on the receiver with the first key component supplied by the key path.
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* The key components are delimated by '.'.
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* If the key path doesn't contain any '.', this method simply
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* invokes [NSObject-valueForKey:].
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*/
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- (id) valueForKeyPath: (NSString*)aKey
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{
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NSRange r = [aKey rangeOfString: @"."];
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@ -437,6 +605,12 @@ NSString* const NSUnknownKeyException = @"NSUnknownKeyException";
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return o;
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}
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/**
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* Iterates over the array sending the receiver [NSObject-valueForKey:]
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* for each object in the array and inserting the result in a dictionary.
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* All nil values returned by [NSObject-valueForKey:] are replaced by the
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* NSNull instance in the dictionary.
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*/
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- (NSDictionary*) valuesForKeys: (NSArray*)keys
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{
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NSMutableDictionary *dict;
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