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//
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// Target.m
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// MYUtilities
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//
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// Created by Jens Alfke on 2/11/08.
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// Copyright 2008 Jens Alfke. All rights reserved.
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//
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#import "Target.h"
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@implementation MYTarget
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jens@7
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jens@7
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- (id) initWithReceiver: (id)receiver action: (SEL)action
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{
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self = [super init];
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if( self ) {
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NSMethodSignature *sig = [receiver methodSignatureForSelector: action];
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CAssert(sig,@"%@<%p> does not respond to %@",[receiver class],receiver,NSStringFromSelector(action));
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jens@7
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CAssert(sig.numberOfArguments==3,
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@"-[%@ %@] can't be used as a target because it takes >1 param",
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[receiver class],NSStringFromSelector(action));
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CAssert(0==strcmp([sig getArgumentTypeAtIndex: 2],"@"),
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@"-[%@ %@] can't be used as a target because it takes a non-object param",
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[receiver class],NSStringFromSelector(action));
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NSInvocation *inv = [NSInvocation invocationWithMethodSignature: sig];
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inv.target = receiver;
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inv.selector = action;
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_invocations = [inv retain];
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}
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return self;
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}
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+ (MYTarget*) targetWithReceiver: (id)receiver action: (SEL)action
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{
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return [[[self alloc] initWithReceiver: receiver action: action] autorelease];
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}
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- (void) dealloc
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{
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[_invocations release];
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[super dealloc];
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}
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- (NSArray*) invocations
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{
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NSMutableArray *invocations = $castIf(NSMutableArray,_invocations);
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if( ! invocations )
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invocations = [NSMutableArray arrayWithObject: _invocations];
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return invocations;
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}
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- (NSString*) description
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{
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NSMutableString *desc = [NSMutableString stringWithFormat: @"%@{", self.class];
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BOOL first = YES;
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for( NSInvocation *inv in self.invocations ) {
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if( first )
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first = NO;
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else
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[desc appendString: @", "];
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[desc appendFormat: @"-[%@ %s]", [inv.target class], inv.selector];
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}
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[desc appendString: @"}"];
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return desc;
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}
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static BOOL equalInvocations( NSInvocation *a, NSInvocation *b )
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{
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return a.target==b.target && a.selector==b.selector;
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}
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- (BOOL) isEqual: (MYTarget*)t
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{
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if( ! [t isKindOfClass: [self class]] )
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return NO;
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if( [_invocations isKindOfClass: [NSInvocation class]] && [t->_invocations isKindOfClass: [NSInvocation class]] )
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return equalInvocations(_invocations,t->_invocations);
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NSArray *myInvocations = self.invocations, *itsInvocations = t.invocations;
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unsigned n = myInvocations.count;
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if( n != itsInvocations.count )
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return NO;
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for( int i=0; i<n; i++ )
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if( ! equalInvocations( [myInvocations objectAtIndex: i],
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[itsInvocations objectAtIndex: i] ) )
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return NO;
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return YES;
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}
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jens@7
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- (void) addTarget: (MYTarget*)target
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{
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setObj(&_invocations,[self invocations]);
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[_invocations addObjectsFromArray: target.invocations];
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}
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static id invokeSingleTarget( NSInvocation *invocation, id param )
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{
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id result = nil;
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if( invocation && invocation.target ) {
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[invocation retain];
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@try{
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[invocation setArgument: ¶m atIndex: 2];
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[invocation invoke];
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NSMethodSignature *sig = invocation.methodSignature;
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NSUInteger returnLength = sig.methodReturnLength;
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if( returnLength==0 ) {
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result = nil; // void
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} else {
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const char *returnType = sig.methodReturnType;
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if( returnType[0]=='@' ) {
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[invocation getReturnValue: &result];
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} else {
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UInt8 returnBuffer[returnLength];
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[invocation getReturnValue: &returnBuffer];
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result = [NSValue valueWithBytes: &returnBuffer objCType: returnType];
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}
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}
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}@finally{
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[invocation release];
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}
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}
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return result;
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}
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jens@7
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- (id) invokeWithSender: (id)sender
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{
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id result;
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NSMutableArray *invocations = $castIf(NSMutableArray,_invocations);
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if( invocations ) {
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for( NSInvocation *invocation in invocations )
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result = invokeSingleTarget(invocation,sender);
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} else {
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result = invokeSingleTarget(_invocations,sender);
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}
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return result;
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}
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@end
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