50 lines
2.4 KiB
Java
50 lines
2.4 KiB
Java
package net.sf.jasperreports.engine.fill;
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class JRLongVarianceIncrementer extends JRAbstractExtendedIncrementer {
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private static JRLongVarianceIncrementer mainInstance = new JRLongVarianceIncrementer();
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public static JRLongVarianceIncrementer getInstance() {
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return mainInstance;
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}
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public Object increment(JRCalculable variable, Object expressionValue, AbstractValueProvider valueProvider) {
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Number value = (Number)variable.getIncrementedValue();
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Number newValue = (Number)expressionValue;
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if (newValue == null) {
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if (variable.isInitialized())
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return null;
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return value;
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}
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if (value == null || variable.isInitialized())
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return JRLongIncrementerFactory.ZERO;
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Number countValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)0));
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Number sumValue = (Number)valueProvider.getValue(variable.getHelperVariable((byte)1));
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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));
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}
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public Object combine(JRCalculable calculable, JRCalculable calculableValue, AbstractValueProvider valueProvider) {
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Number value = (Number)calculable.getIncrementedValue();
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if (calculableValue.getValue() == null) {
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if (calculable.isInitialized())
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return null;
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return value;
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}
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if (value == null || calculable.isInitialized())
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return new Long(((Number)calculableValue.getIncrementedValue()).longValue());
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double v1 = value.doubleValue();
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double c1 = ((Number)valueProvider.getValue(calculable.getHelperVariable((byte)0))).doubleValue();
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double s1 = ((Number)valueProvider.getValue(calculable.getHelperVariable((byte)1))).doubleValue();
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double v2 = ((Number)calculableValue.getIncrementedValue()).doubleValue();
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double c2 = ((Number)valueProvider.getValue(calculableValue.getHelperVariable((byte)0))).doubleValue();
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double s2 = ((Number)valueProvider.getValue(calculableValue.getHelperVariable((byte)1))).doubleValue();
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c1 -= c2;
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s1 -= s2;
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double c = c1 + c2;
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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));
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}
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public Object initialValue() {
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return JRLongIncrementerFactory.ZERO;
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}
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}
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