Ejemplo n.º 1
0
 /**
  * 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;
 }
Ejemplo n.º 2
0
 /**
  * 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
  */
 @Override
 public boolean bodyCall(Node[] args, int length, RuleContext context) {
   if (length < 2)
     throw new BuiltinException(this, context, "Must have at least 2 arguments to " + getName());
   String text = getString(getArg(0, args, context), context);
   String pattern = getString(getArg(1, args, context), context);
   Matcher m = Pattern.compile(pattern).matcher(text);
   if (!m.matches()) return false;
   if (length > 2) {
     // bind any capture groups
     BindingEnvironment env = context.getEnv();
     for (int i = 0; i < Math.min(length - 2, m.groupCount()); i++) {
       String gm = m.group(i + 1);
       Node match = (gm != null) ? Node.createLiteral(gm) : Node.createLiteral("");
       if (!env.bind(args[i + 2], match)) return false;
     }
   }
   return true;
 }
Ejemplo n.º 3
0
 /**
  * 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);
 }