query.nc

nesC写的heed算法

// $Id: Query.nc,v 1.2.8.2 2003/08/18 22:09:47 cssharp Exp $

/*									tab:4
 * "Copyright (c) 2000-2003 The Regents of the University  of California.  
 * All rights reserved.
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 * two paragraphs and the author appear in all copies of this software.
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 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */
module Query {
  provides {
    interface QueryIntf;
  }
}

implementation {
  command short QueryIntf.size(QueryPtr q) {
    return sizeof(Query) + (q->numFields-1)*sizeof(Field) + q->numExprs * sizeof(Expr);
  }

  command Field QueryIntf.getField(QueryPtr q, uint8_t idx) {
    return q->fields[idx];
  }

  command Field *QueryIntf.getFieldPtr(QueryPtr q, uint8_t idx) {
    return &q->fields[idx];
  }
  
  command result_t QueryIntf.setField(QueryPtr q, uint8_t idx, Field f) {
    q->fields[idx] = f;
    return SUCCESS;
  }

  command Expr QueryIntf.getExpr(QueryPtr q, uint8_t idx) {
    return *(Expr *)((char *)((char *)q + sizeof(Query) + 
			      (q->numFields-1)*sizeof(Field) + 
			      idx * sizeof(Expr)));
  }

  command result_t QueryIntf.setExpr(QueryPtr q, uint8_t idx, Expr e) {
    *(Expr *)((char *)((char *)q + sizeof(Query) + 
		       (q->numFields-1)*sizeof(Field) + 
		       idx * sizeof(Expr))) = e;
    return SUCCESS;
  }

  command bool QueryIntf.fieldsComplete(Query q) {
    return (q.knownFields & 0xFFFF) == 0xFFFF;
  }

  command bool QueryIntf.exprsComplete(Query q) {
    return (q.knownExprs & 0xFFFF) == 0xFFFF;
  }  
  
}