보조지표 소수점 추가, cci 수정

backend/src/main/java/com/goldenchart/service/CciOnSourceIndicator.java

@@ -0,0 +1,45 @@
+package com.goldenchart.service;
+
+import org.ta4j.core.BarSeries;
+import org.ta4j.core.Indicator;
+import org.ta4j.core.indicators.CachedIndicator;
+import org.ta4j.core.indicators.averages.SMAIndicator;
+import org.ta4j.core.indicators.statistics.MeanDeviationIndicator;
+import org.ta4j.core.num.Num;
+
+/**
+ * TradingView/업비트 CCI — 임의 가격 소스에 대해
+ * (src - SMA) / (0.015 × MeanDeviation) 계산.
+ */
+public class CciOnSourceIndicator extends CachedIndicator<Num> {
+
+    private final Indicator<Num> price;
+    private final SMAIndicator sma;
+    private final MeanDeviationIndicator meanDeviation;
+    private final Num factor;
+    private final int barCount;
+
+    public CciOnSourceIndicator(Indicator<Num> price, int barCount) {
+        super(price);
+        this.price = price;
+        this.barCount = barCount;
+        this.factor = getBarSeries().numFactory().numOf(0.015);
+        this.sma = new SMAIndicator(price, barCount);
+        this.meanDeviation = new MeanDeviationIndicator(price, barCount);
+    }
+
+    @Override
+    protected Num calculate(int index) {
+        final Num meanDeviation = this.meanDeviation.getValue(index);
+        if (meanDeviation.isZero()) {
+            return getBarSeries().numFactory().zero();
+        }
+        return price.getValue(index).minus(sma.getValue(index))
+                .dividedBy(meanDeviation.multipliedBy(factor));
+    }
+
+    @Override
+    public int getCountOfUnstableBars() {
+        return barCount - 1;
+    }
+}