decouple SyncAdapter from ContentProvider

1 files changed, 96 insertions, 0 deletions

diff --git a/core/java/android/content/ContentProviderClient.java b/core/java/android/content/ContentProviderClient.java
new file mode 100644
index 0000000..9902807
--- /dev/null
+++ b/core/java/android/content/ContentProviderClient.java
@@ -0,0 +1,96 @@
+package android.content;
+
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.RemoteException;
+import android.os.ParcelFileDescriptor;
+import android.content.res.AssetFileDescriptor;
+
+import java.io.FileNotFoundException;
+
+/**
+ * The public interface object used to interact with a {@link ContentProvider}. This is obtained by
+ * calling {@link ContentResolver#acquireContentProviderClient}. This object must be released
+ * using {@link #release} in order to indicate to the system that the {@link ContentProvider} is
+ * no longer needed and can be killed to free up resources.
+ */
+public class ContentProviderClient {
+    private final IContentProvider mContentProvider;
+    private final ContentResolver mContentResolver;
+
+    /**
+     * @hide
+     */
+    ContentProviderClient(ContentResolver contentResolver, IContentProvider contentProvider) {
+        mContentProvider = contentProvider;
+        mContentResolver = contentResolver;
+    }
+
+    /** {@see ContentProvider#query} */
+    public Cursor query(Uri url, String[] projection, String selection,
+            String[] selectionArgs, String sortOrder) throws RemoteException {
+        return mContentProvider.query(url, projection, selection,  selectionArgs, sortOrder);
+    }
+
+    /** {@see ContentProvider#getType} */
+    public String getType(Uri url) throws RemoteException {
+        return mContentProvider.getType(url);
+    }
+
+    /** {@see ContentProvider#insert} */
+    public Uri insert(Uri url, ContentValues initialValues)
+            throws RemoteException {
+        return mContentProvider.insert(url, initialValues);
+    }
+
+    /** {@see ContentProvider#bulkInsert} */
+    public int bulkInsert(Uri url, ContentValues[] initialValues) throws RemoteException {
+        return mContentProvider.bulkInsert(url, initialValues);
+    }
+
+    /** {@see ContentProvider#delete} */
+    public int delete(Uri url, String selection, String[] selectionArgs)
+            throws RemoteException {
+        return mContentProvider.delete(url, selection, selectionArgs);
+    }
+
+    /** {@see ContentProvider#update} */
+    public int update(Uri url, ContentValues values, String selection,
+            String[] selectionArgs) throws RemoteException {
+        return mContentProvider.update(url, values, selection, selectionArgs);
+    }
+
+    /** {@see ContentProvider#openFile} */
+    public ParcelFileDescriptor openFile(Uri url, String mode)
+            throws RemoteException, FileNotFoundException {
+        return mContentProvider.openFile(url, mode);
+    }
+
+    /** {@see ContentProvider#openAssetFile} */
+    public AssetFileDescriptor openAssetFile(Uri url, String mode)
+            throws RemoteException, FileNotFoundException {
+        return mContentProvider.openAssetFile(url, mode);
+    }
+
+    /**
+     * Call this to indicate to the system that the associated {@link ContentProvider} is no
+     * longer needed by this {@link ContentProviderClient}.
+     * @return true if this was release, false if it was already released
+     */
+    public boolean release() {
+        return mContentResolver.releaseProvider(mContentProvider);
+    }
+
+    /**
+     * Get a reference to the {@link ContentProvider} that is associated with this
+     * client. If the {@link ContentProvider} is running in a different process then
+     * null will be returned. This can be used if you know you are running in the same
+     * process as a provider, and want to get direct access to its implementation details.
+     *
+     * @return If the associated {@link ContentProvider} is local, returns it.
+     * Otherwise returns null.
+     */
+    public ContentProvider getLocalContentProvider() {
+        return ContentProvider.coerceToLocalContentProvider(mContentProvider);
+    }
+}