Sort on attestations

.gitignore

@@ -1,2 +1,3 @@
+out/
 .idea/
 target/

src/main/java/com/eternitywall/BitcoinBlockHeaderAttestation.java

@@ -2,6 +2,7 @@
  * Created by luca on 25/02/2017.
  */
 
+import java.util.Arrays;
 import java.util.logging.Logger;
 
 /**
@@ -59,4 +60,11 @@ public void serializePayload(StreamSerializationContext ctx) {
     public String toString() {
         return "com.eternitywall.BitcoinBlockHeaderAttestation(" + this.height + ")";
     }
+
+
+    @Override
+    public int compareTo(TimeAttestation o) {
+        BitcoinBlockHeaderAttestation ob = (BitcoinBlockHeaderAttestation) o;
+        return this.height - ob.height;
+    }
 }

src/main/java/com/eternitywall/PendingAttestation.java

@@ -1,5 +1,7 @@
 package com.eternitywall;
 
+import org.bouncycastle.util.Arrays;
+
 import java.nio.charset.StandardCharsets;
 import java.util.logging.Logger;
 
@@ -78,4 +80,10 @@ public void serializePayload(StreamSerializationContext ctx) {
     public String toString() {
         return "PendingAttestation(\'" + new String(this.uri, StandardCharsets.UTF_8) + "\')";
     }
+
+    @Override
+    public int compareTo(TimeAttestation o) {
+        PendingAttestation opa = (PendingAttestation) o;
+        return Arrays.compareUnsigned(this.uri, opa.uri) ;
+    }
 }

src/main/java/com/eternitywall/TimeAttestation.java

@@ -8,11 +8,13 @@
  */
 
 
+import com.eternitywall.op.Op;
+
 import java.util.Arrays;
 import java.util.logging.Logger;
 
 /** Class representing com.eternitywall.Timestamp signature verification */
-class TimeAttestation {
+class TimeAttestation  implements Comparable<TimeAttestation> {
 
 
     private static Logger log = Logger.getLogger(TimeAttestation.class.getName());
@@ -70,4 +72,14 @@ public void serialize(StreamSerializationContext ctx) {
     public void serializePayload(StreamSerializationContext ctxPayload) {
 
     }
+
+    @Override
+    public int compareTo(TimeAttestation o) {
+        int deltaTag = org.bouncycastle.util.Arrays.compareUnsigned(this._TAG(),o._TAG());
+        if( deltaTag == 0){
+            return this.compareTo(o);
+        } else {
+            return deltaTag;
+        }
+    }
 }

src/main/java/com/eternitywall/Timestamp.java

@@ -88,6 +88,8 @@ public void serialize(StreamSerializationContext ctx) {
 
         // sort
         List<TimeAttestation> sortedAttestations = this.attestations;
+        Collections.sort(sortedAttestations);
+
         if (sortedAttestations.size() > 1) {
             for (int i = 0; i < sortedAttestations.size(); i++) {
                 ctx.writeBytes(new byte[]{(byte) 0xff, (byte) 0x00});

src/main/java/com/eternitywall/UnknownAttestation.java

@@ -1,5 +1,7 @@
 package com.eternitywall;
 
+import org.bouncycastle.util.Arrays;
+
 import java.util.logging.Logger;
 
 /**
@@ -39,4 +41,11 @@ public static UnknownAttestation deserialize(StreamDeserializationContext ctxPay
     public String toString() {
         return "com.eternitywall.UnknownAttestation " + this._TAG() + ' ' + this.payload;
     }
+
+
+    @Override
+    public int compareTo(TimeAttestation o) {
+        UnknownAttestation ota = (UnknownAttestation) o;
+        return Arrays.compareUnsigned(this.payload, ota.payload) ;
+    }
 }