/**
  * This method is invoked when the builtin is called in a rule body.
  *
  * @param args the array of argument values for the builtin, this is an array of Nodes, some of
  *     which may be Node_RuleVariables.
  * @param length the length of the argument list, may be less than the length of the args array
  *     for some rule engines
  * @param context an execution context giving access to other relevant data
  * @return return true if the buildin predicate is deemed to have succeeded in the current
  *     environment
  */
 public boolean bodyCall(Node[] args, int length, RuleContext context) {
   checkArgs(length, context);
   BindingEnvironment env = context.getEnv();
   Node n1 = getArg(0, args, context);
   Node n2 = getArg(1, args, context);
   if (n1.isLiteral() && n2.isLiteral()) {
     Object v1 = n1.getLiteralValue();
     Object v2 = n2.getLiteralValue();
     Node sum = null;
     if (v1 instanceof Number && v2 instanceof Number) {
       Number nv1 = (Number) v1;
       Number nv2 = (Number) v2;
       if (v1 instanceof Float
           || v1 instanceof Double
           || v2 instanceof Float
           || v2 instanceof Double) {
         sum = Util.makeDoubleNode(nv1.doubleValue() - nv2.doubleValue());
       } else {
         sum = Util.makeLongNode(nv1.longValue() - nv2.longValue());
       }
       return env.bind(args[2], sum);
     }
   }
   // Doesn't (yet) handle partially bound cases
   return false;
 }
Exemple #2
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 private Object maxOfList(Node lst, RuleContext context) {
   java.util.List<Node> l = Util.convertList(lst, context);
   Number max = null;
   XSDDateTime maxDate = null;
   for (int i = 0; l != null && i < l.size(); i++) {
     Node elt = (Node) l.get(i);
     if (elt != null && elt.isLiteral()) {
       Object v1 = elt.getLiteralValue();
       if (v1 instanceof Number) {
         if (max == null || max.doubleValue() < ((Number) v1).doubleValue()) {
           max = (Number) v1;
         }
       } else if (v1 instanceof XSDDateTime) {
         if (maxDate == null || maxDate.compareTo((XSDDateTime) v1) < 0) {
           maxDate = (XSDDateTime) v1;
         }
       } else {
         throw new BuiltinException(
             this, context, "Element of list input to max not a number: " + v1.toString());
       }
     } else {
       throw new BuiltinException(
           this, context, "Element of list input to max not a Literal: " + elt.toString());
     }
   }
   if (maxDate != null) {
     return maxDate;
   }
   return max;
 }
Exemple #3
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 /**
  * This method is invoked when the builtin is called in a rule body.
  *
  * @param args the array of argument values for the builtin, this is an array of Nodes, some of
  *     which may be Node_RuleVariables.
  * @param length the length of the argument list, may be less than the length of the args array
  *     for some rule engines
  * @param context an execution context giving access to other relevant data
  * @return return true if the buildin predicate is deemed to have succeeded in the current
  *     environment
  */
 @SuppressWarnings("unused")
 public boolean bodyCall(Node[] args, int length, RuleContext context) {
   checkArgs(length, context);
   BindingEnvironment env = context.getEnv();
   Object maxVal = null;
   Node min = null;
   boolean allLongs = true;
   if (length >= 3) {
     for (int i = 0; i < length; i++) {
       Node n1 = getArg(i, args, context);
       if (n1.isLiteral()) {
         Object v1 = n1.getLiteralValue();
         if (v1 instanceof Number) {
           Number nv1 = (Number) v1;
           if (maxVal == null) {
             maxVal = nv1;
           } else {
             if (v1 instanceof Float || v1 instanceof Double) {
               double pwd = nv1.doubleValue();
               if (pwd > ((Number) maxVal).doubleValue()) {
                 maxVal = nv1;
               }
               allLongs = false;
             } else if (v1 instanceof Integer || v1 instanceof Long) {
               long pwd = nv1.longValue();
               if (pwd > ((Number) maxVal).doubleValue()) {
                 maxVal = nv1;
               }
             }
           }
         } else if (v1 instanceof XSDDateTime) {
           if (maxVal == null) {
             maxVal = v1;
           } else if (maxVal instanceof XSDDateTime) {
             if (((XSDDateTime) maxVal).compareTo((XSDDateTime) v1) < 0) {
               maxVal = v1;
             }
           } else {
             throw new BuiltinException(
                 this,
                 context,
                 "Can't compare datetime ("
                     + v1.toString()
                     + ") with non-datetime value ("
                     + maxVal.toString()
                     + ")");
           }
         } else {
           return false;
         }
       }
     } // end for
   } else {
     Node n1 = getArg(0, args, context);
     if (n1 == null || n1.equals(RDF.Nodes.nil)) {
       return false;
     } else {
       maxVal = maxOfList(n1, context);
     }
   }
   if (maxVal == null) {
     return false;
   }
   if (maxVal instanceof Float) {
     min = Utils.makeFloatNode(((Number) maxVal).floatValue());
   } else if (maxVal instanceof Double) {
     min = Util.makeDoubleNode(((Number) maxVal).doubleValue());
   } else if (maxVal instanceof XSDDateTime) {
     min = Utils.makeXSDDateTimeNode((XSDDateTime) maxVal);
   } else if (maxVal instanceof Integer) {
     min = Util.makeIntNode(((Number) maxVal).intValue());
   } else {
     min = Util.makeLongNode(((Number) maxVal).longValue());
   }
   return env.bind(args[length - 1], min);
 }