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/*
IXPostingSet.h
Copyright 1991,NeXT Computer,Inc.
*/
#import <objc/Object.h>
#import "protocols.h"
/* This class implements a dynamic array of postings, sorted by handle. Its */
/* primary use is for combining sets of postings - i.e., performing set union, */
/* intersection and subtraction.*/
#ifdef NX_COMPILER_RELEASE_3_0
#import <remote/transport.h>
typedef id <IXPostingExchange> IXPostingExchangeType;
@interface IXPostingSet: Object <NXTransport, IXPostingExchange, IXPostingOperations>
#else
typedef id IXPostingExchangeType;
@interface IXPostingSet: Object
#endif
{
@public
unsigned thisElement;
unsigned numElements;
unsigned maxElements;
struct IXPosting *postings;
}
/* These two methods initialize the posting set with existing postings. The*/
/* first method takes the postings from an object that conforms to the posting */
/* exchange protocol. The second one takes the postings from the caller.*/
- initWithPostingsIn:(IXPostingExchangeType)anObject;
- initCount:(unsigned)theCount andPostings:(const IXPosting *)thePostings;
/* These methods perform set union, intersection and subtraction between the */
/* posting set and an object that conforms to the posting exchange protocol, */
/* leaving the result in the posting set. These are commonly used to refine or */
/* expand query results on a posting cursor.*/
- formUnionWithPostingsIn:(IXPostingExchangeType)anObject;
- formIntersectionWithPostingsIn:(IXPostingExchangeType)anObject;
- subtractPostingsIn:(IXPostingExchangeType)anObject;
/* This method sets the posting set to a specific position or element. The */
/* numbering starts with zero. The count is returned by the count method.*/
- (unsigned)setPosition:(unsigned)aPosition;
- setCount:(unsigned)theCount /* sets the postings without copying.*/
andPostings:(IXPosting *)thePostings byCopy:(BOOL)aBoolean;
/* The posting set can be archived to and unarchived from a typed stream. It */
/* can also be passed between processes using the distributed object substrate.*/
- read:(NXTypedStream *)typedStream;
- write:(NXTypedStream *)typedStream;
@end
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