support dauration data type

client/src/main/java/com/vesoft/nebula/client/graph/data/DurationWrapper.java

@@ -0,0 +1,78 @@
+/* Copyright (c) 2021 vesoft inc. All rights reserved.
+ *
+ * This source code is licensed under Apache 2.0 License.
+ */
+
+package com.vesoft.nebula.client.graph.data;
+
+import com.vesoft.nebula.Duration;
+import java.util.Objects;
+
+public class DurationWrapper extends BaseDataObject {
+    private final Duration duration;
+
+    /**
+     * DurationWrapper is a wrapper for the duration type of nebula-graph
+     */
+    public DurationWrapper(Duration duration) {
+        this.duration = duration;
+    }
+
+    /**
+     * @return utc duration seconds
+     */
+    public long getSeconds() {
+        return duration.seconds;
+    }
+
+    /**
+     * @retrun utc duration microseconds
+     */
+    public int getMicroseconds() {
+        return duration.microseconds;
+    }
+
+    /**
+     * @return utc duration months
+     */
+    public int getMonths() {
+        return duration.months;
+    }
+
+    /**
+     * @return the duration string
+     */
+    public String getDurationString() {
+        return String.format("duration({months:%d, seconds:%d, microseconds:%d})",
+                getMonths(), getSeconds(), getMicroseconds());
+    }
+
+
+    @Override
+    public String toString() {
+        long year = duration.seconds / (60 * 60 * 24);
+        long remainSeconds = duration.seconds - (year) * (60 * 60 * 24);
+        return String.format("P%dM%dDT%sS",
+                duration.months, year, remainSeconds + duration.microseconds / 1000000.0);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DurationWrapper that = (DurationWrapper) o;
+        return duration.months == that.getMonths()
+                && duration.seconds == that.getSeconds()
+                && duration.microseconds == that.getMicroseconds();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(duration);
+    }
+
+}