Android: provide an ID to document providers

This ID will be useful to get an instance of a document provider back
from a different activity.

Change-Id: I9419ea23d51f8e9ffd70252bd8e367cf51bde1ad

android/source/src/java/org/libreoffice/storage/DocumentProviderFactory.java

@@ -57,9 +57,9 @@ public final class DocumentProviderFactory {
 
             // initialize document providers list
             instance.providers = new IDocumentProvider[3];
-            instance.providers[0] = new LocalDocumentsDirectoryProvider();
-            instance.providers[1] = new LocalDocumentsProvider();
-            instance.providers[2] = new OwnCloudProvider(context);
+            instance.providers[0] = new LocalDocumentsDirectoryProvider(0);
+            instance.providers[1] = new LocalDocumentsProvider(1);
+            instance.providers[2] = new OwnCloudProvider(2, context);
 
             // initialize document provider names list
             instance.providerNames = new String[instance.providers.length];
@@ -80,13 +80,14 @@ public final class DocumentProviderFactory {
     }
 
     /**
-     * Retrieve the provider associated to a certain position.
+     * Retrieve the provider associated to a certain id.
      *
-     * @param position
-     * @return document provider in that position.
+     * @param id
+     * @return document provider with that id.
      */
-    public IDocumentProvider getProvider(int position) {
-        return providers[position];
+    public IDocumentProvider getProvider(int id) {
+        // as for now, id == position in providers array
+        return providers[id];
     }
 
     /**

android/source/src/java/org/libreoffice/storage/IDocumentProvider.java

@@ -43,4 +43,15 @@ public interface IDocumentProvider {
      * @return string resource pointing to the provider name.
      */
     int getNameResource();
+
+    /**
+     * Provides the unique ID for a document provider instance in a program.
+     *
+     * This ID should be set when the instance is built. It could be used to
+     * tell two instances of the same document provider apart, e. g. two
+     * instances of OwnCloudProvider pointing to different servers.
+     *
+     * @return Unique ID for a document provider instance.
+     */
+    int getId();
 }

android/source/src/java/org/libreoffice/storage/local/LocalDocumentsDirectoryProvider.java

@@ -25,6 +25,10 @@ import android.os.Environment;
  */
 public class LocalDocumentsDirectoryProvider extends LocalDocumentsProvider {
 
+    public LocalDocumentsDirectoryProvider(int id) {
+        super(id);
+    }
+
     @Override
     public IFile getRootDirectory() {
         File documentsDirectory = new File(

android/source/src/java/org/libreoffice/storage/local/LocalDocumentsProvider.java

@@ -23,6 +23,12 @@ import android.os.Environment;
  */
 public class LocalDocumentsProvider implements IDocumentProvider {
 
+    private int id;
+
+    public LocalDocumentsProvider(int id) {
+        this.id = id;
+    }
+
     @Override
     public IFile getRootDirectory() {
         return new LocalFile(Environment.getExternalStorageDirectory());
@@ -37,4 +43,9 @@ public class LocalDocumentsProvider implements IDocumentProvider {
     public int getNameResource() {
         return R.string.local_file_system;
     }
+
+    @Override
+    public int getId() {
+        return id;
+    }
 }

android/source/src/java/org/libreoffice/storage/owncloud/OwnCloudProvider.java

@@ -29,6 +29,8 @@ import com.owncloud.android.lib.resources.files.RemoteFile;
 public class OwnCloudProvider implements IDocumentProvider,
         OnSharedPreferenceChangeListener {
 
+    private int id;
+
     private Context context;
     private OwnCloudClient client;
     private File cacheDir;
@@ -37,7 +39,8 @@ public class OwnCloudProvider implements IDocumentProvider,
     private String userName;
     private String password;
 
-    public OwnCloudProvider(Context context) {
+    public OwnCloudProvider(int id, Context context) {
+        this.id = id;
         this.context = context;
 
         // read preferences
@@ -169,4 +172,9 @@ public class OwnCloudProvider implements IDocumentProvider,
         if (changed)
             setupClient();
     }
+
+    @Override
+    public int getId() {
+        return id;
+    }
 }