refactor transactionpart to message and childmessage

src/main/java/com/sparrowwallet/drongo/protocol/BlockHeader.java

@@ -0,0 +1,4 @@
+package com.sparrowwallet.drongo.protocol;
+
+public class BlockHeader {
+}

src/main/java/com/sparrowwallet/drongo/protocol/ChildMessage.java

@@ -0,0 +1,30 @@
+package com.sparrowwallet.drongo.protocol;
+
+public abstract class ChildMessage extends Message {
+
+    protected Message parent;
+
+    public ChildMessage(byte[] rawtx, int offset) {
+        super(rawtx, offset);
+    }
+
+    public Message getParent() {
+        return parent;
+    }
+
+    public final void setParent(Message parent) {
+        this.parent = parent;
+    }
+
+    protected void adjustLength(int adjustment) {
+        adjustLength(0, adjustment);
+    }
+
+    protected void adjustLength(int newArraySize, int adjustment) {
+        super.adjustLength(newArraySize, adjustment);
+
+        if(parent != null) {
+            parent.adjustLength(newArraySize, adjustment);
+        }
+    }
+}

src/main/java/com/sparrowwallet/drongo/protocol/Message.java

@@ -7,8 +7,8 @@ import org.slf4j.LoggerFactory;
 import java.io.IOException;
 import java.io.OutputStream;
 
-public abstract class TransactionPart {
+public abstract class Message {
-    private static final Logger log = LoggerFactory.getLogger(TransactionPart.class);
+    private static final Logger log = LoggerFactory.getLogger(Message.class);
 
     public static final int MAX_SIZE = 0x02000000; // 32MB
     public static final int UNKNOWN_LENGTH = Integer.MIN_VALUE;
@@ -21,11 +21,9 @@ public abstract class TransactionPart {
     // Note that it's relative to the start of the array NOT the start of the message payload.
     protected int cursor;
 
-    protected TransactionPart parent;
-
     protected int length = UNKNOWN_LENGTH;
 
-    public TransactionPart(byte[] rawtx, int offset) {
+    public Message(byte[] rawtx, int offset) {
         this.rawtx = rawtx;
         this.cursor = this.offset = offset;
 
@@ -34,14 +32,6 @@ public abstract class TransactionPart {
 
     protected abstract void parse() throws ProtocolException;
 
-    public TransactionPart getParent() {
-        return parent;
-    }
-
-    public final void setParent(TransactionPart parent) {
-        this.parent = parent;
-    }
-
     public int getOffset() {
         return offset;
     }
@@ -137,9 +127,5 @@ public abstract class TransactionPart {
             length++;  // The assumption here is we never call adjustLength with the same arraySize as before.
         else if (newArraySize != 0)
             length += VarInt.sizeOf(newArraySize) - VarInt.sizeOf(newArraySize - 1);
-
-        if (parent != null) {
-            parent.adjustLength(newArraySize, adjustment);
-        }
     }
 }

src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java

@@ -2,7 +2,6 @@ package com.sparrowwallet.drongo.protocol;
 
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.address.Address;
-import com.sparrowwallet.drongo.address.P2PKHAddress;
 import com.sparrowwallet.drongo.crypto.ECKey;
 
 import java.io.ByteArrayOutputStream;
@@ -17,7 +16,7 @@ import java.util.List;
 import static com.sparrowwallet.drongo.Utils.uint32ToByteStreamLE;
 import static com.sparrowwallet.drongo.Utils.uint64ToByteStreamLE;
 
-public class Transaction extends TransactionPart {
+public class Transaction extends ChildMessage {
     public static final int MAX_BLOCK_SIZE = 1000 * 1000;
     public static final long MAX_BITCOIN = 21 * 1000 * 1000L;
     public static final long SATOSHIS_PER_BITCOIN = 100 * 1000 * 1000L;

src/main/java/com/sparrowwallet/drongo/protocol/TransactionInput.java

@@ -5,7 +5,7 @@ import com.sparrowwallet.drongo.Utils;
 import java.io.IOException;
 import java.io.OutputStream;
 
-public class TransactionInput extends TransactionPart {
+public class TransactionInput extends ChildMessage {
     public static final long SEQUENCE_LOCKTIME_DISABLED = 4294967295L;
     public static final long SEQUENCE_RBF_ENABLED = 4294967293L;
     public static final long MAX_RELATIVE_TIMELOCK = 2147483647L;

src/main/java/com/sparrowwallet/drongo/protocol/TransactionOutPoint.java

@@ -7,7 +7,7 @@ import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Objects;
 
-public class TransactionOutPoint extends TransactionPart {
+public class TransactionOutPoint extends ChildMessage {
 
     static final int MESSAGE_LENGTH = 36;
 
@@ -18,7 +18,7 @@ public class TransactionOutPoint extends TransactionPart {
 
     private Address[] addresses = new Address[0];
 
-    public TransactionOutPoint(byte[] rawtx, int offset, TransactionPart parent) {
+    public TransactionOutPoint(byte[] rawtx, int offset, Message parent) {
         super(rawtx, offset);
         setParent(parent);
     }

src/main/java/com/sparrowwallet/drongo/protocol/TransactionOutput.java

@@ -7,7 +7,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 
-public class TransactionOutput extends TransactionPart {
+public class TransactionOutput extends ChildMessage {
     // The output's value is kept as a native type in order to save class instances.
     private long value;
 

src/main/java/com/sparrowwallet/drongo/protocol/TransactionWitness.java

@@ -10,7 +10,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
-public class TransactionWitness extends TransactionPart {
+public class TransactionWitness extends ChildMessage {
     private List<byte[]> pushes;
 
     public TransactionWitness(Transaction parent, byte[] rawtx, int offset) {