Introducing the RedeemHtlcOperation class

graphenej/src/main/java/cy/agorise/graphenej/operations/RedeemHtlcOperation.java

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+package cy.agorise.graphenej.operations;
+
+import com.google.common.primitives.Bytes;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import cy.agorise.graphenej.AssetAmount;
+import cy.agorise.graphenej.BaseOperation;
+import cy.agorise.graphenej.Htlc;
+import cy.agorise.graphenej.OperationType;
+import cy.agorise.graphenej.UserAccount;
+import cy.agorise.graphenej.Util;
+import cy.agorise.graphenej.Varint;
+
+/**
+ * Class used to encapsulate the redeem_htlc operation.
+ */
+public class RedeemHtlcOperation extends BaseOperation {
+    static final String KEY_REDEEMER = "redeemer";
+    static final String KEY_PREIMAGE = "preimage";
+    static final String KEY_HTLC_ID = "htlc_id";
+
+    private AssetAmount fee;
+    private UserAccount redeemer;
+    private Htlc htlc;
+    private byte[] preimage;
+
+    /**
+     * Public constructor
+     *
+     * @param fee   The fee associated with this operation.
+     * @param redeemer  The user account that will redeem the HTLC.
+     * @param htlc    The existing HTLC operation.
+     */
+    public RedeemHtlcOperation(AssetAmount fee, UserAccount redeemer, Htlc htlc, byte[] preimage) {
+        super(OperationType.HTLC_REDEEM_OPERATION);
+        this.fee = fee;
+        this.redeemer = redeemer;
+        this.htlc = htlc;
+        this.preimage = preimage;
+    }
+
+    @Override
+    public void setFee(AssetAmount fee) {
+        this.fee = fee;
+    }
+
+    public AssetAmount getFee(){
+        return this.fee;
+    }
+
+    public UserAccount getRedeemer() {
+        return redeemer;
+    }
+
+    public void setRedeemer(UserAccount redeemer) {
+        this.redeemer = redeemer;
+    }
+
+    public Htlc getHtlc() {
+        return htlc;
+    }
+
+    public void setHtlc(Htlc htlc) {
+        this.htlc = htlc;
+    }
+
+    @Override
+    public byte[] toBytes() {
+        byte[] feeBytes = this.fee.toBytes();
+        byte[] htlcBytes = this.htlc.toBytes();
+        byte[] redeemerBytes = this.redeemer.toBytes();
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        DataOutput out = new DataOutputStream(byteArrayOutputStream);
+        try{
+            Varint.writeUnsignedVarLong(this.preimage.length, out);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        byte[] preimageLength = byteArrayOutputStream.toByteArray();
+        return Bytes.concat(feeBytes, htlcBytes, redeemerBytes, preimageLength, this.preimage);
+    }
+
+    @Override
+    public JsonElement toJsonObject() {
+        JsonArray array = new JsonArray();
+        array.add(this.getId());
+        JsonObject jsonObject = new JsonObject();
+        jsonObject.add(KEY_FEE, fee.toJsonObject());
+        jsonObject.add(KEY_REDEEMER, this.redeemer.toJsonObject());
+        jsonObject.addProperty(KEY_PREIMAGE, Util.bytesToHex(this.preimage));
+        jsonObject.addProperty(KEY_HTLC_ID, this.htlc.getObjectId());
+        jsonObject.add(KEY_EXTENSIONS, new JsonArray());
+        array.add(jsonObject);
+        return array;
+    }
+
+    @Override
+    public String toJsonString() {
+        GsonBuilder gsonBuilder = new GsonBuilder();
+        return gsonBuilder.create().toJson(this);
+    }
+}