1 files changed, 108 insertions, 0 deletions
diff --git a/src/core/DataSourceTypes.vala b/src/core/DataSourceTypes.vala
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+++ b/src/core/DataSourceTypes.vala
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+/* Copyright 2011-2014 Yorba Foundation
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later).  See the COPYING file in this distribution.
+ */
+
+//
+// Media sources
+//
+
+public abstract class ThumbnailSource : DataSource {
+    public virtual signal void thumbnail_altered() {
+    }
+    
+    public ThumbnailSource(int64 object_id = INVALID_OBJECT_ID) {
+        base (object_id);
+    }
+    
+    public virtual void notify_thumbnail_altered() {
+        // fire signal on self
+        thumbnail_altered();
+        
+        // signal reflection to DataViews
+        contact_subscribers(subscriber_thumbnail_altered);
+    }
+    
+    private void subscriber_thumbnail_altered(DataView view) {
+        ((ThumbnailView) view).notify_thumbnail_altered();
+    }
+
+    public abstract Gdk.Pixbuf? get_thumbnail(int scale) throws Error;
+    
+    // get_thumbnail( ) may return a cached pixbuf; create_thumbnail( ) is guaranteed to create
+    // a new pixbuf (e.g., by the source loading, decoding, and scaling image data)
+    public abstract Gdk.Pixbuf? create_thumbnail(int scale) throws Error;
+    
+    // A ThumbnailSource may use another ThumbnailSource as its representative.  It's up to the
+    // subclass to forward on the appropriate methods to this ThumbnailSource.  But, since multiple
+    // ThumbnailSources may be referring to a single ThumbnailSource, this allows for that to be
+    // detected and optimized (in caching).
+    //
+    // Note that it's the responsibility of this ThumbnailSource to fire "thumbnail-altered" if its
+    // representative does the same.
+    //
+    // Default behavior is to return the ID of this.
+    public virtual string get_representative_id() {
+        return get_source_id();
+    }
+    
+    public abstract PhotoFileFormat get_preferred_thumbnail_format();
+}
+
+public abstract class PhotoSource : MediaSource {
+    public PhotoSource(int64 object_id = INVALID_OBJECT_ID) {
+        base (object_id);
+    }
+
+    public abstract PhotoMetadata? get_metadata();
+    
+    public abstract Gdk.Pixbuf get_pixbuf(Scaling scaling) throws Error;
+}
+
+public abstract class VideoSource : MediaSource {
+}
+
+//
+// EventSource
+//
+
+public abstract class EventSource : ThumbnailSource {
+    public EventSource(int64 object_id = INVALID_OBJECT_ID) {
+        base (object_id);
+    }
+    
+    public abstract time_t get_start_time();
+    
+    public abstract time_t get_end_time();
+    
+    public abstract uint64 get_total_filesize();
+    
+    public abstract int get_media_count();
+    
+    public abstract Gee.Collection<MediaSource> get_media();
+    
+    public abstract string? get_comment();
+    
+    public abstract bool set_comment(string? comment);
+}
+
+//
+// ContainerSource
+//
+
+public interface ContainerSource : DataSource {
+    public abstract bool has_links();
+    
+    public abstract SourceBacklink get_backlink();
+    
+    public abstract void break_link(DataSource source);
+    
+    public abstract void break_link_many(Gee.Collection<DataSource> sources);
+    
+    public abstract void establish_link(DataSource source);
+    
+    public abstract void establish_link_many(Gee.Collection<DataSource> sources);
+}
+
+