org.algernon.aam.opcode
Class Count

java.lang.Object
  org.jatha.dynatype.StandardLispValue
      org.algernon.aam.Opcode
          org.algernon.aam.opcode.Count

All Implemented Interfaces:

Comparable, LispValue

public class Count

extends Opcode

This class implements the COUNT Opcode in the AAM. Count binds a variable to the number of results returned from a query.

   Example: (:COUNT ?size ?sister (sister Mary ?sister))
   Example: (:COUNT ?size ?date (:DATE ?date))  ;; will bind ?size to 1
 

Succeeds if the query succeeds. Fails if the query fails.

Field Summary

Fields inherited from class org.algernon.aam.Opcode

f_algy, m_name, m_numberOfArguments

Fields inherited from class org.jatha.dynatype.StandardLispValue

f_lisp

Constructor Summary

Count(Algernon algy, String name, int numArgs)
Create a new AAM Count Opcode.

Method Summary

void	execute(Processor processor, AlgernonKBSet kbSet) Executes the Count opcode.

Methods inherited from class org.algernon.aam.Opcode

argumentToClass, argumentToClass, argumentToFacet, argumentToFacet, argumentToFrame, argumentToFrame, argumentToInstance, argumentToInstance, argumentToInstance, argumentToRelation, argumentToRelation, getName, getNumberOfArguments, setName, setNumberOfArguments, toString

Methods inherited from class org.jatha.dynatype.StandardLispValue

abs, acos, add, adjustSpecialCount, append, apply, apropos_print, asin, assoc, atan, atan2, atom, basic_atom, basic_bignump, basic_consp, basic_constantp, basic_floatp, basic_foreignp, basic_functionp, basic_integerp, basic_keywordp, basic_length, basic_listp, basic_macrop, basic_null, basic_numberp, basic_stringp, basic_symbolp, bignump, boundp, butlast, car, cdr, ceiling, characterp, clrhash, compareTo, concatenate, consp, constantp, contains, copy_list, copy, cos, cot, csc, degreesToRadians, divide, eighth, elt, elt, eq, eql, equal, equalNumeric, factorial, fboundp, fifth, first, floatp, floor, fourth, funcall, functionp, get_specialCount, gethash, gethash, getLisp, greaterThan, greaterThanOrEqual, hash_table_count, hash_table_rehash_size, hash_table_rehash_threshold, hash_table_size, hash_table_test, hashtablep, integerp, internal_getName, internal_prin1_as_cdr, internal_prin1, internal_princ_as_cdr, internal_princ, internal_print_as_cdr, internal_print, iterator, keywordp, last, length, lessThan, lessThanOrEqual, lisp_null, list, listp, max, member, min, multiply, nconc, negate, neql, ninth, nreverse, nstringCapitalize, nstringDowncase, nstringUpcase, numberp, pop, position, prin1, princ, print, push, radiansToDegrees, rassoc, reciprocal, remhash, remove, rest, reverse, rplaca, rplacd, sec, second, set_special, setf_gethash, setf_symbol_function, setf_symbol_plist, setf_symbol_value, setLisp, setPackage, setq, seventh, sin, sixth, specialP, sqrt, string, stringCapitalize, stringDowncase, stringEndsWith, stringEq, stringEqual, stringGreaterP, stringGreaterThan, stringGreaterThanOrEqual, stringLeftTrim, stringLeftTrim, stringLessP, stringLessThan, stringLessThanOrEqual, stringNeq, stringNotGreaterP, stringNotLessP, stringp, stringRightTrim, stringRightTrim, stringStartsWith, stringTrim, stringTrim, stringUpcase, subst, substring, substring, subtract, symbol_function, symbol_name, symbol_package, symbol_plist, symbol_value, symbolp, tan, tenth, third, toCollection, toJava, toJava, toString, toStringAsCdr_internal, toStringAsCdr, toStringShort, toStringShort, toStringSimple, type_of, typep, zerop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Count

public Count(Algernon algy,
             String name,
             int numArgs)

Create a new AAM Count Opcode.

Method Detail

execute

public void execute(Processor processor,
                    AlgernonKBSet kbSet)
             throws AlgernonDataException

Executes the Count opcode. Binds a variable to the number of bindings of another variable present in the topmost binding set. Always succeeds - but the result may be zero if the user specified an incorrect variable.

Overrides:

execute in class Opcode

Throws:

AlgernonDataException