Resolve Java 6/7/8 concurrent map compatibility & cleanup imports for Android

FIXES storesafe#726 (keySet error)

THANKS to @NeoLSN (Jason Yang/楊朝傑) for pointer to the solution in
storesafe#727

Author: Christopher J. Brody

CHANGES.md

@@ -1,8 +1,8 @@
 # Changes
 
-###### cordova-sqlite-legacy-express-core 1.0.3-pre01
+###### cordova-sqlite-legacy-express-core 1.0.3
 
-TBD
+- Resolved Java 6/7/8 concurrent map compatibility issue reported in litehelpers/Cordova-sqlite-storage#726, THANKS to pointer by @NeoLSN (Jason Yang/楊朝傑) in litehelpers/Cordova-sqlite-storage#727.
 
 ###### cordova-sqlite-legacy-express-core 1.0.2
 

README.md

@@ -72,6 +72,7 @@ Use the `location` or `iosDatabaseLocation` option in `sqlitePlugin.openDatabase
 
 ## Announcements
 
+- Resolved Java 6/7/8 concurrent map compatibility issue reported in [litehelpers/Cordova-sqlite-storage#726](https://github.com/litehelpers/Cordova-sqlite-storage/issues/726), THANKS to pointer by [@NeoLSN (Jason Yang/楊朝傑)](https://github.com/NeoLSN) in [litehelpers/Cordova-sqlite-storage#727](https://github.com/litehelpers/Cordova-sqlite-storage/issues/727).
 - Fixed iOS/macOS platform version to use [PSPDFThreadSafeMutableDictionary.m](https://gist.github.com/steipete/5928916) to avoid threading issue ref: [litehelpers/Cordova-sqlite-storage#716](https://github.com/litehelpers/Cordova-sqlite-storage/issues/716)
 - Resolved transaction problem after window.location (page) change with possible data loss ref: [litehelpers/Cordova-sqlite-storage#666](https://github.com/litehelpers/Cordova-sqlite-storage/issues/666)
 - [brodybits / cordova-sqlite-test-app](https://github.com/brodybits/cordova-sqlite-test-app) project is a CC0 (public domain) starting point (NOTE that this plugin must be added) and may also be used to reproduce issues with this plugin.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cordova-sqlite-legacy-express-core",
-  "version": "1.0.3-pre01",
+  "version": "1.0.3",
   "description": "Native interface to SQLite for PhoneGap/Cordova (legacy express core version)",
   "cordova": {
     "id": "cordova-sqlite-legacy-express-core",

plugin.xml

@@ -2,7 +2,7 @@
 <plugin xmlns="http://www.phonegap.com/ns/plugins/1.0"
     xmlns:android="http://schemas.android.com/apk/res/android"
     id="cordova-sqlite-legacy-express-core"
-    version="1.0.3-pre01">
+    version="1.0.3">
 
     <name>Cordova sqlite storage plugin - legacy express core version</name>
 

src/android/io/sqlc/SQLitePlugin.java

@@ -8,15 +8,18 @@
 
 import android.annotation.SuppressLint;
 
-import android.util.Base64;
 import android.util.Log;
 
 import java.io.File;
+
 import java.lang.IllegalArgumentException;
 import java.lang.Number;
-import java.util.concurrent.ConcurrentHashMap;
+
+import java.util.Map;
 import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.LinkedBlockingQueue;
+
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -27,19 +30,24 @@
 import org.json.JSONException;
 import org.json.JSONObject;
 
-import java.io.FileOutputStream;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.io.IOException;
-
 public class SQLitePlugin extends CordovaPlugin {
 
     /**
      * Multiple database runner map (static).
-     * NOTE: no public static accessor to db (runner) map since it would not work with db threading.
-     * FUTURE put DBRunner into a public class that can provide external accessor.
+     *
+     * NOTE: no public static accessor to db (runner) map since it is not
+     * expected to work properly with db threading.
+     *
+     * FUTURE TBD put DBRunner into a public class that can provide external accessor.
+     *
+     * ADDITIONAL NOTE: Storing as Map<String, DBRunner> to avoid portabiity issue
+     * between Java 6/7/8 as discussed in:
+     * https://gist.github.com/AlainODea/1375759b8720a3f9f094
+     *
+     * THANKS to @NeoLSN (Jason Yang/楊朝傑) for giving the pointer in:
+     * https://github.com/litehelpers/Cordova-sqlite-storage/issues/727
      */
-    static ConcurrentHashMap<String, DBRunner> dbrmap = new ConcurrentHashMap<String, DBRunner>();
+    static Map<String, DBRunner> dbrmap = new ConcurrentHashMap<String, DBRunner>();
 
     /**
      * NOTE: Using default constructor, no explicit constructor.