first commit

hrmsEjb/net/sf/jasperreports/engine/fill/JRBigDecimalStandardDeviationIncrementer.java

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+package net.sf.jasperreports.engine.fill;
+
+import java.math.BigDecimal;
+
+class JRBigDecimalStandardDeviationIncrementer extends JRAbstractExtendedIncrementer {
+  private static JRBigDecimalStandardDeviationIncrementer mainInstance = new JRBigDecimalStandardDeviationIncrementer();
+  
+  public static JRBigDecimalStandardDeviationIncrementer getInstance() {
+    return mainInstance;
+  }
+  
+  public Object increment(JRCalculable variable, Object expressionValue, AbstractValueProvider valueProvider) {
+    if (expressionValue == null) {
+      if (variable.isInitialized())
+        return null; 
+      return variable.getValue();
+    } 
+    Number varianceValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)2));
+    return new BigDecimal(Math.sqrt(varianceValue.doubleValue()));
+  }
+  
+  public Object initialValue() {
+    return JRBigDecimalIncrementerFactory.ZERO;
+  }
+}