Introducing the HTLC object instance

graphenej/src/main/java/cy/agorise/graphenej/Htlc.java

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+package cy.agorise.graphenej;
+
+import com.google.gson.JsonElement;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import cy.agorise.graphenej.interfaces.ByteSerializable;
+import cy.agorise.graphenej.interfaces.JsonSerializable;
+
+/**
+ * Class used to represent an existing HTLC contract.
+ */
+public class Htlc extends GrapheneObject implements ByteSerializable, JsonSerializable {
+
+    public Htlc(String id) {
+        super(id);
+    }
+
+    @Override
+    public byte[] toBytes() {
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        DataOutput out = new DataOutputStream(byteArrayOutputStream);
+        try {
+            Varint.writeUnsignedVarLong(this.instance, out);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return byteArrayOutputStream.toByteArray();
+    }
+
+    @Override
+    public String toJsonString() {
+        return this.getObjectId();
+    }
+
+    @Override
+    public JsonElement toJsonObject() {
+        return null;
+    }
+}

graphenej/src/test/java/cy/agorise/graphenej/HtlcTest.java

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+package cy.agorise.graphenej;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class HtlcTest {
+    private final Htlc htlc = new Htlc("1.16.124");
+
+    @Test
+    public void testByteSerialization(){
+        Htlc htlc1 = new Htlc("1.16.1");
+        Htlc htlc2 = new Htlc("1.16.100");
+        Htlc htlc3 = new Htlc("1.16.500");
+        Htlc htlc4 = new Htlc("1.16.1000");
+
+        byte[] expected_1 = Util.hexToBytes("01");
+        byte[] expected_2 = Util.hexToBytes("64");
+        byte[] expected_3 = Util.hexToBytes("f403");
+        byte[] expected_4 = Util.hexToBytes("e807");
+
+        Assert.assertArrayEquals(expected_1, htlc1.toBytes());
+        Assert.assertArrayEquals(expected_2, htlc2.toBytes());
+        Assert.assertArrayEquals(expected_3, htlc3.toBytes());
+        Assert.assertArrayEquals(expected_4, htlc4.toBytes());
+    }
+}