Introducing support for the GetBlockHeader api call in the single-connection mode

graphenej/src/main/java/cy/agorise/graphenej/api/android/DeserializationMap.java

@@ -15,9 +15,11 @@ import cy.agorise.graphenej.Authority;
 import cy.agorise.graphenej.Transaction;
 import cy.agorise.graphenej.api.calls.GetAccounts;
 import cy.agorise.graphenej.api.calls.GetBlock;
+import cy.agorise.graphenej.api.calls.GetBlockHeader;
 import cy.agorise.graphenej.api.calls.GetRelativeAccountHistory;
 import cy.agorise.graphenej.api.calls.GetRequiredFees;
 import cy.agorise.graphenej.models.Block;
+import cy.agorise.graphenej.models.BlockHeader;
 import cy.agorise.graphenej.models.OperationHistory;
 import cy.agorise.graphenej.objects.Memo;
 import cy.agorise.graphenej.operations.CustomOperation;
@@ -38,6 +40,8 @@ public class DeserializationMap {
     private HashMap<Class, Gson> mGsonMap = new HashMap<>();
 
     public DeserializationMap(){
+        Gson genericGson = new Gson();
+
         // GetBlock
         mClassMap.put(GetBlock.class, Block.class);
         Gson getBlockGson = new GsonBuilder()
@@ -76,6 +80,10 @@ public class DeserializationMap {
             .create();
         mGsonMap.put(GetRelativeAccountHistory.class, getRelativeAcountHistoryGson);
 
+        // GetBlockHeader
+        mClassMap.put(GetBlockHeader.class, BlockHeader.class);
+        mGsonMap.put(GetBlockHeader.class, genericGson);
+
     }
 
     public Class getReceivedClass(Class _class){

graphenej/src/main/java/cy/agorise/graphenej/api/android/NetworkService.java

@@ -29,6 +29,7 @@ import cy.agorise.graphenej.api.calls.GetRequiredFees;
 import cy.agorise.graphenej.models.AccountProperties;
 import cy.agorise.graphenej.models.ApiCall;
 import cy.agorise.graphenej.models.Block;
+import cy.agorise.graphenej.models.BlockHeader;
 import cy.agorise.graphenej.models.JsonRpcResponse;
 import cy.agorise.graphenej.models.OperationHistory;
 import io.reactivex.annotations.Nullable;
@@ -274,9 +275,13 @@ public class NetworkService extends Service {
                 Class responsePayloadClass = mDeserializationMap.getReceivedClass(requestClass);
                 Gson gson = mDeserializationMap.getGson(requestClass);
                 if(responsePayloadClass == Block.class){
-                    // If the response payload is a simple Block instance, we proceed to de-serialize it
+                    // If the response payload is a Block instance, we proceed to de-serialize it
                     Type GetBlockResponse = new TypeToken<JsonRpcResponse<Block>>() {}.getType();
                     parsedResponse = gson.fromJson(text, GetBlockResponse);
+                }else if(responsePayloadClass == BlockHeader.class){
+                    // If the response payload is a BlockHeader instance, we proceed to de-serialize it
+                    Type GetBlockHeaderResponse = new TypeToken<JsonRpcResponse<BlockHeader>>(){}.getType();
+                    parsedResponse = gson.fromJson(text, GetBlockHeaderResponse);
                 } else if(responsePayloadClass == List.class){
                     // If the response payload is a List, further inquiry is required in order to
                     // determine a list of what is expected here

graphenej/src/main/java/cy/agorise/graphenej/api/calls/GetBlockHeader.java

@@ -0,0 +1,30 @@
+package cy.agorise.graphenej.api.calls;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+
+import cy.agorise.graphenej.RPC;
+import cy.agorise.graphenej.api.ApiAccess;
+import cy.agorise.graphenej.models.ApiCall;
+
+/**
+ * Wrapper around the "get_block_header" API call. To be used in the single-connection mode.
+ */
+public class GetBlockHeader implements ApiCallable {
+    public static final int REQUIRED_API = ApiAccess.API_DATABASE;
+
+    private long blockNumber;
+
+    public GetBlockHeader(long number){
+        this.blockNumber = number;
+    }
+
+    @Override
+    public ApiCall toApiCall(int apiId, long sequenceId) {
+        ArrayList<Serializable> params = new ArrayList<>();
+        String blockNum = String.format("%d", this.blockNumber);
+        params.add(blockNum);
+
+        return new ApiCall(apiId, RPC.CALL_GET_BLOCK_HEADER, params, RPC.VERSION, sequenceId);
+    }
+}

graphenej/src/main/java/cy/agorise/graphenej/models/BlockHeader.java

@@ -1,12 +1,11 @@
 package cy.agorise.graphenej.models;
 
 /**
- * Created by nelson on 12/13/16.
+ * Class used to represent the response to the 'get_block_header' API call.
  */
 public class BlockHeader {
     public String previous;
     public String timestamp;
     public String witness;
     public String transaction_merkle_root;
-    public Object[] extension;
 }