add OHLC plugin

src/main/java/ats/plugin/OHLCValue.java

@@ -0,0 +1,54 @@
+package ats.plugin;
+
+import org.joda.time.DateTime;
+
+/**
+ * OHLCValue stores one bar of OHLC info.
+ */
+public class OHLCValue {
+    private DateTime time;
+    private double open;
+    private double high;
+    private double low;
+    private double close;
+
+    
+    public OHLCValue(DateTime time,
+					 double open, double high,
+					 double low, double close)
+	{
+        this.time  = time;
+        this.open  = open;
+        this.high  = high;
+        this.low   = low;
+        this.close = close;
+    }
+
+    public DateTime getTime() {
+        return time;
+    }
+
+    public Double getOpen() {
+        return open;
+    }
+
+    public Double getHigh() {
+        return high;
+    }
+
+    public Double getLow() {
+        return low;
+    }
+
+    public Double getClose() {
+        return close;
+    }
+	
+	/**
+	 * Return a human readable representation of this event.
+	 */
+	public String toString() {
+		return String.format("OHLCValue[%s,open=%s,high=%s,low=%s,close=%s]",
+							 time, open, high, low, close);
+	}
+}