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      1 /*
      2  * Copyright (C) 2010 Google Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.clearsilver.jsilver.functions.structure;
     18 
     19 import com.google.clearsilver.jsilver.data.Data;
     20 import com.google.clearsilver.jsilver.functions.NonEscapingFunction;
     21 import com.google.clearsilver.jsilver.values.Value;
     22 import static com.google.clearsilver.jsilver.values.Value.literalConstant;
     23 import com.google.clearsilver.jsilver.values.VariableValue;
     24 
     25 /**
     26  * Returns the number of child nodes for the HDF variable.
     27  */
     28 public class SubcountFunction extends NonEscapingFunction {
     29 
     30   /**
     31    * @param args A variable value referring to an HDF node
     32    * @return Number of children
     33    */
     34   public Value execute(Value... args) {
     35     VariableValue arg = (VariableValue) args[0];
     36     if (arg.getReference() == null) {
     37       return literalConstant(0, arg);
     38     }
     39 
     40     Data thisNode = arg.getReference().getSymlink();
     41     return literalConstant(thisNode.getChildCount(), arg);
     42   }
     43 
     44 }
     45