first commit

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

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+package net.sf.jasperreports.engine.fill;
+
+class JRDoubleAverageIncrementer extends JRAbstractExtendedIncrementer {
+  private static JRDoubleAverageIncrementer mainInstance = new JRDoubleAverageIncrementer();
+  
+  public static JRDoubleAverageIncrementer getInstance() {
+    return mainInstance;
+  }
+  
+  public Object increment(JRCalculable variable, Object expressionValue, AbstractValueProvider valueProvider) {
+    if (expressionValue == null) {
+      if (variable.isInitialized())
+        return null; 
+      return variable.getValue();
+    } 
+    Number countValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)0));
+    Number sumValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)1));
+    return new Double(sumValue.doubleValue() / countValue.doubleValue());
+  }
+  
+  public Object initialValue() {
+    return JRDoubleIncrementerFactory.ZERO;
+  }
+}