[gnome-documents] manager: add a BaseManager class implementation

[Cosimo Cecchi <cosimoc src gnome org>]

commit 786d55ae0ddfd8be9dedd480439fe27b100bf409
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Fri Oct 14 13:26:15 2011 -0400

    manager: add a BaseManager class implementation
    
    This will be useful to share code between the various manager in
    gnome-documents.

 src/Makefile-js.am |    1 +
 src/manager.js     |  113 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 114 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile-js.am b/src/Makefile-js.am
index dff929c..6371328 100644
--- a/src/Makefile-js.am
+++ b/src/Makefile-js.am
@@ -17,6 +17,7 @@ dist_js_DATA = \
     main.js \
     mainToolbar.js \
     mainWindow.js \
+    manager.js \
     offsetController.js \
     preview.js \
     query.js \
diff --git a/src/manager.js b/src/manager.js
new file mode 100644
index 0000000..39ba11a
--- /dev/null
+++ b/src/manager.js
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2011 Red Hat, Inc.
+ *
+ * Gnome Documents is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Gnome Documents is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Gnome Documents; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Author: Cosimo Cecchi <cosimoc redhat com>
+ *
+ */
+
+const Signals = imports.signals;
+
+function BaseManager() {
+    this._init();
+};
+
+BaseManager.prototype = {
+    _init: function() {
+        this._items = {};
+        this._activeItem = null;
+    },
+
+    getItemById: function(id) {
+        let retval = this._items[id];
+
+        if (!retval)
+            retval = null;
+
+        return retval;
+    },
+
+    addItem: function(item) {
+        this._items[item.id] = item;
+        this.emit('item-added', item);
+    },
+
+    setActiveItem: function(item) {
+        if (!item)
+            return false;
+
+        if (item != this._activeItem) {
+            this._activeItem = item;
+            this.emit('active-changed', this._activeItem);
+
+            return true;
+        }
+
+        return false;
+    },
+
+    setActiveItemById: function(id) {
+        let item = this.getItemById(id);
+        return this.setActiveItem(item);
+    },
+
+    getItems: function() {
+        return this._items;
+    },
+
+    getItemsCount: function() {
+        return Object.keys(this._items).length;
+    },
+
+    getActiveItem: function() {
+        return this._activeItem;
+    },
+
+    removeItem: function(item) {
+        this.removeItemById(item.id);
+    },
+
+    removeMatchingItems: function(filterFunc) {
+        for (idx in this._items) {
+            let item = this._items[idx];
+            if (!filterFunc(item))
+                this.removeItemById(idx);
+        }
+    },
+
+    removeItemById: function(id) {
+        let item = this._items[id];
+
+        if (item) {
+            delete this._items[id];
+            this.emit('item-removed', item);
+        }
+    },
+
+    clear: function() {
+        this._items = {};
+        this._activeItem = null;
+    },
+
+    getFilter: function() {
+        let item = this.getActiveItem();
+        if (item && item.getFilter())
+            return item.getFilter();
+
+        return '';
+    }
+};
+Signals.addSignalMethods(BaseManager.prototype);