first commit

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

@@ -0,0 +1,49 @@
+package net.sf.jasperreports.engine.fill;
+
+class JRIntegerVarianceIncrementer extends JRAbstractExtendedIncrementer {
+  private static JRIntegerVarianceIncrementer mainInstance = new JRIntegerVarianceIncrementer();
+  
+  public static JRIntegerVarianceIncrementer getInstance() {
+    return mainInstance;
+  }
+  
+  public Object increment(JRCalculable variable, Object expressionValue, AbstractValueProvider valueProvider) {
+    Number value = (Number)variable.getIncrementedValue();
+    Number newValue = (Number)expressionValue;
+    if (newValue == null) {
+      if (variable.isInitialized())
+        return null; 
+      return value;
+    } 
+    if (value == null || variable.isInitialized())
+      return JRIntegerIncrementerFactory.ZERO; 
+    Number countValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)0));
+    Number sumValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)1));
+    return new Integer((countValue.intValue() - 1) * value.intValue() / countValue.intValue() + (sumValue.intValue() / countValue.intValue() - newValue.intValue()) * (sumValue.intValue() / countValue.intValue() - newValue.intValue()) / (countValue.intValue() - 1));
+  }
+  
+  public Object combine(JRCalculable calculable, JRCalculable calculableValue, AbstractValueProvider valueProvider) {
+    Number value = (Number)calculable.getIncrementedValue();
+    if (calculableValue.getValue() == null) {
+      if (calculable.isInitialized())
+        return null; 
+      return value;
+    } 
+    if (value == null || calculable.isInitialized())
+      return new Integer(((Number)calculableValue.getIncrementedValue()).intValue()); 
+    double v1 = value.doubleValue();
+    double c1 = ((Number)valueProvider.getValue(calculable.getHelperVariable((byte)0))).doubleValue();
+    double s1 = ((Number)valueProvider.getValue(calculable.getHelperVariable((byte)1))).doubleValue();
+    double v2 = ((Number)calculableValue.getIncrementedValue()).doubleValue();
+    double c2 = ((Number)valueProvider.getValue(calculableValue.getHelperVariable((byte)0))).doubleValue();
+    double s2 = ((Number)valueProvider.getValue(calculableValue.getHelperVariable((byte)1))).doubleValue();
+    c1 -= c2;
+    s1 -= s2;
+    double c = c1 + c2;
+    return new Integer((int)(c1 / c * v1 + c2 / c * v2 + c2 / c1 * s1 / c * s1 / c + c1 / c2 * s2 / c * s2 / c - 2.0D * s1 / c * s2 / c));
+  }
+  
+  public Object initialValue() {
+    return JRIntegerIncrementerFactory.ZERO;
+  }
+}