Revert "Remove unnecessary class"

This reverts commit d172d9a.

library/src/main/java/com/github/javiersantos/appupdater/AppUpdaterUtils.java

@@ -0,0 +1,165 @@
+package com.github.javiersantos.appupdater;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+
+import com.github.javiersantos.appupdater.enums.AppUpdaterError;
+import com.github.javiersantos.appupdater.enums.UpdateFrom;
+import com.github.javiersantos.appupdater.objects.GitHub;
+import com.github.javiersantos.appupdater.objects.Update;
+
+public class AppUpdaterUtils {
+    private Context context;
+    private UpdateListener updateListener;
+    private AppUpdaterListener appUpdaterListener;
+    private UpdateFrom updateFrom;
+    private GitHub gitHub;
+    private String xmlOrJSONUrl;
+    private UtilsAsync.LatestAppVersion latestAppVersion;
+
+    public interface UpdateListener {
+        /**
+         * onSuccess method called after it is successful
+         * onFailed method called if it can't retrieve the latest version
+         *
+         * @param update            object with the latest update information: version and url to download
+         * @see com.github.javiersantos.appupdater.objects.Update
+         * @param isUpdateAvailable compare installed version with the latest one
+         */
+        void onSuccess(Update update, Boolean isUpdateAvailable);
+
+        void onFailed(AppUpdaterError error);
+    }
+
+    @Deprecated
+    public interface AppUpdaterListener {
+        /**
+         * onSuccess method called after it is successful
+         * onFailed method called if it can't retrieve the latest version
+         *
+         * @param latestVersion     available in the provided source
+         * @param isUpdateAvailable compare installed version with the latest one
+         */
+        void onSuccess(String latestVersion, Boolean isUpdateAvailable);
+
+        void onFailed(AppUpdaterError error);
+    }
+
+    public AppUpdaterUtils(Context context) {
+        this.context = context;
+        this.updateFrom = UpdateFrom.GOOGLE_PLAY;
+    }
+
+    /**
+     * Set the source where the latest update can be found. Default: GOOGLE_PLAY.
+     *
+     * @param updateFrom source where the latest update is uploaded. If GITHUB is selected, .setGitHubAndRepo method is required.
+     * @return this
+     * @see com.github.javiersantos.appupdater.enums.UpdateFrom
+     * @see <a href="https://github.com/javiersantos/AppUpdater/wiki">Additional documentation</a>
+     */
+    public AppUpdaterUtils setUpdateFrom(UpdateFrom updateFrom) {
+        this.updateFrom = updateFrom;
+        return this;
+    }
+
+    /**
+     * Set the user and repo where the releases are uploaded. You must upload your updates as a release in order to work properly tagging them as vX.X.X or X.X.X.
+     *
+     * @param user GitHub user
+     * @param repo GitHub repository
+     * @return this
+     */
+    public AppUpdaterUtils setGitHubUserAndRepo(String user, String repo) {
+        this.gitHub = new GitHub(user, repo);
+        return this;
+    }
+
+    /**
+     * Set the url to the xml with the latest version info.
+     *
+     * @param xmlUrl file
+     * @return this
+     */
+    public AppUpdaterUtils setUpdateXML(@NonNull String xmlUrl) {
+        this.xmlOrJSONUrl = xmlUrl;
+        return this;
+    }
+
+    /**
+     * Set the url to the xml with the latest version info.
+     *
+     * @param jsonUrl file
+     * @return this
+     */
+    public AppUpdaterUtils setUpdateJSON(@NonNull String jsonUrl) {
+        this.xmlOrJSONUrl = jsonUrl;
+        return this;
+    }
+
+
+    /**
+     * Method to set the AppUpdaterListener for the AppUpdaterUtils actions
+     *
+     * @param appUpdaterListener the listener to be notified
+     * @return this
+     * @see com.github.javiersantos.appupdater.AppUpdaterUtils.AppUpdaterListener
+     * @deprecated
+     */
+    public AppUpdaterUtils withListener(AppUpdaterListener appUpdaterListener) {
+        this.appUpdaterListener = appUpdaterListener;
+        return this;
+    }
+
+    /**
+     * Method to set the UpdateListener for the AppUpdaterUtils actions
+     *
+     * @param updateListener the listener to be notified
+     * @return this
+     * @see com.github.javiersantos.appupdater.AppUpdaterUtils.UpdateListener
+     */
+    public AppUpdaterUtils withListener(UpdateListener updateListener) {
+        this.updateListener = updateListener;
+        return this;
+    }
+
+    /**
+     * Execute AppUpdaterUtils in background.
+     */
+    public void start() {
+        latestAppVersion = new UtilsAsync.LatestAppVersion(context, true, updateFrom, gitHub, xmlOrJSONUrl, new AppUpdater.LibraryListener() {
+            @Override
+            public void onSuccess(Update update) {
+                if (updateListener != null) {
+                    updateListener.onSuccess(update, UtilsLibrary.isUpdateAvailable(UtilsLibrary.getAppInstalledVersion(context), update.getLatestVersion()));
+                } else if (appUpdaterListener != null) {
+                    appUpdaterListener.onSuccess(update.getLatestVersion(), UtilsLibrary.isUpdateAvailable(UtilsLibrary.getAppInstalledVersion(context), update.getLatestVersion()));
+                } else {
+                    throw new RuntimeException("You must provide a listener for the AppUpdaterUtils");
+                }
+            }
+
+            @Override
+            public void onFailed(AppUpdaterError error) {
+                if (updateListener != null) {
+                    updateListener.onFailed(error);
+                } else if (appUpdaterListener != null) {
+                    appUpdaterListener.onFailed(error);
+                } else {
+                    throw new RuntimeException("You must provide a listener for the AppUpdaterUtils");
+                }
+            }
+        });
+
+        latestAppVersion.execute();
+    }
+
+    /**
+     * Stops the execution of AppUpdater.
+     */
+    public void stop() {
+        if (latestAppVersion != null && !latestAppVersion.isCancelled()) {
+            latestAppVersion.cancel(true);
+        }
+    }
+}