1 files changed, 96 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/data/MediaSource.java b/src/com/android/gallery3d/data/MediaSource.java
new file mode 100644
index 000000000..95901283b
--- /dev/null
+++ b/src/com/android/gallery3d/data/MediaSource.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.gallery3d.data;
+
+import android.net.Uri;
+
+import com.android.gallery3d.data.MediaSet.ItemConsumer;
+
+import java.util.ArrayList;
+
+public abstract class MediaSource {
+    private static final String TAG = "MediaSource";
+    private String mPrefix;
+
+    protected MediaSource(String prefix) {
+        mPrefix = prefix;
+    }
+
+    public String getPrefix() {
+        return mPrefix;
+    }
+
+    public Path findPathByUri(Uri uri, String type) {
+        return null;
+    }
+
+    public abstract MediaObject createMediaObject(Path path);
+
+    public void pause() {
+    }
+
+    public void resume() {
+    }
+
+    public Path getDefaultSetOf(Path item) {
+        return null;
+    }
+
+    public long getTotalUsedCacheSize() {
+        return 0;
+    }
+
+    public long getTotalTargetCacheSize() {
+        return 0;
+    }
+
+    public static class PathId {
+        public PathId(Path path, int id) {
+            this.path = path;
+            this.id = id;
+        }
+        public Path path;
+        public int id;
+    }
+
+    // Maps a list of Paths (all belong to this MediaSource) to MediaItems,
+    // and invoke consumer.consume() for each MediaItem with the given id.
+    //
+    // This default implementation uses getMediaObject for each Path. Subclasses
+    // may override this and provide more efficient implementation (like
+    // batching the database query).
+    public void mapMediaItems(ArrayList<PathId> list, ItemConsumer consumer) {
+        int n = list.size();
+        for (int i = 0; i < n; i++) {
+            PathId pid = list.get(i);
+            MediaObject obj;
+            synchronized (DataManager.LOCK) {
+                obj = pid.path.getObject();
+                if (obj == null) {
+                    try {
+                        obj = createMediaObject(pid.path);
+                    } catch (Throwable th) {
+                        Log.w(TAG, "cannot create media object: " + pid.path, th);
+                    }
+                }
+            }
+            if (obj != null) {
+                consumer.consume(pid.id, (MediaItem) obj);
+            }
+        }
+    }
+}