refactor: Migrate Internal Constants class to kotlin

android-core/src/main/java/com/mparticle/identity/IdentityApi.java

@@ -93,7 +93,7 @@ public MParticleUser getCurrentUser() {
      */
     @Nullable
     public MParticleUser getUser(@NonNull Long mpid) {
-        if (!Constants.TEMPORARY_MPID.equals(mpid) && mConfigManager.mpidExists(mpid)) {
+        if (Constants.TEMPORARY_MPID != mpid && mConfigManager.mpidExists(mpid)) {
             return MParticleUserImpl.getInstance(mContext, mpid, mUserDelegate);
         } else {
             return null;
@@ -252,7 +252,7 @@ public BaseIdentityTask modify(@NonNull final IdentityApiRequest updateRequest)
         if (updateRequest.mpid == null) {
             updateRequest.mpid = mConfigManager.getMpid();
         }
-        if (Constants.TEMPORARY_MPID.equals(updateRequest.mpid)) {
+        if (Constants.TEMPORARY_MPID == updateRequest.mpid) {
             String message = "modify() requires a non-zero MPID, please make sure a MParticleUser is present before making a modify request.";
             if (devMode) {
                 throw new IllegalArgumentException(message);

android-core/src/main/kotlin/com/mparticle/internal/BatchId.kt

@@ -0,0 +1,48 @@
+package com.mparticle.internal
+
+import com.mparticle.internal.database.services.MessageService.ReadyMessage
+
+class BatchId {
+    var mpid: Long
+        get() = field
+    var sessionId: String?
+        get() = field
+    var dataplanId: String?
+        get() = field
+    var dataplanVersion: Int?
+        get() = field
+
+    constructor(mpid: Long, sessionId: String?, dataplanId: String?, dataplanVersion: Int?) {
+        this.mpid = mpid
+        this.sessionId = sessionId
+        this.dataplanId = dataplanId
+        this.dataplanVersion = dataplanVersion
+    }
+
+    constructor(readyMessage: ReadyMessage) {
+        mpid = readyMessage.mpid
+        sessionId = readyMessage.sessionId
+        dataplanId = readyMessage.dataplanId
+        dataplanVersion = readyMessage.dataplanVersion
+    }
+
+    override fun equals(obj: Any?): Boolean {
+        if (obj !is BatchId) {
+            return false
+        }
+        for (i in 0 until fields().size) {
+            if (!MPUtility.isEqual(fields()[i], obj.fields()[i])) {
+                return false
+            }
+        }
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return fields().contentHashCode()
+    }
+
+    private fun fields(): Array<Any?> {
+        return arrayOf(mpid, sessionId, dataplanId, dataplanVersion)
+    }
+}