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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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