first commit

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

@@ -0,0 +1,49 @@
+package net.sf.jasperreports.engine.fill;
+
+class JRLongVarianceIncrementer extends JRAbstractExtendedIncrementer {
+  private static JRLongVarianceIncrementer mainInstance = new JRLongVarianceIncrementer();
+  
+  public static JRLongVarianceIncrementer 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 JRLongIncrementerFactory.ZERO; 
+    Number countValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)0));
+    Number sumValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)1));
+    return new Long((countValue.longValue() - 1L) * value.longValue() / countValue.longValue() + (sumValue.longValue() / countValue.longValue() - newValue.longValue()) * (sumValue.longValue() / countValue.longValue() - newValue.longValue()) / (countValue.longValue() - 1L));
+  }
+  
+  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 Long(((Number)calculableValue.getIncrementedValue()).longValue()); 
+    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 Long((long)(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 JRLongIncrementerFactory.ZERO;
+  }
+}