1 files changed, 93 insertions, 0 deletions
diff --git a/src/de/danoeh/antennapod/util/QueueAccess.java b/src/de/danoeh/antennapod/util/QueueAccess.java
new file mode 100644
index 000000000..7a1c7fef2
--- /dev/null
+++ b/src/de/danoeh/antennapod/util/QueueAccess.java
@@ -0,0 +1,93 @@
+package de.danoeh.antennapod.util;
+
+import de.danoeh.antennapod.feed.FeedItem;
+
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Provides methods for accessing the queue. It is possible to load only a part of the information about the queue that
+ * is stored in the database (e.g. sometimes the user just has to test if a specific item is contained in the List.
+ * QueueAccess provides an interface for accessing the queue without having to care about the type of the queue
+ * representation.
+ */
+public abstract class QueueAccess {
+    /**
+     * Returns true if the item is in the queue, false otherwise.
+     */
+    public abstract boolean contains(long id);
+
+    /**
+     * Removes the item from the queue.
+     *
+     * @return true if the queue was modified by this operation.
+     */
+    public abstract boolean remove(long id);
+
+    private QueueAccess() {
+
+    }
+
+    public static QueueAccess IDListAccess(final List<Long> ids) {
+        return new QueueAccess() {
+            @Override
+            public boolean contains(long id) {
+                return (ids != null) && ids.contains(id);
+            }
+
+            @Override
+            public boolean remove(long id) {
+                return ids.remove(id);
+            }
+
+
+        };
+    }
+
+    public static QueueAccess ItemListAccess(final List<FeedItem> items) {
+        return new QueueAccess() {
+            @Override
+            public boolean contains(long id) {
+                if (items == null) {
+                    return false;
+                }
+                for (FeedItem item : items) {
+                    if (item.getId() == id) {
+                        return true;
+                    }
+                }
+                return false;
+            }
+
+            @Override
+            public boolean remove(long id) {
+                Iterator<FeedItem> it = items.iterator();
+                FeedItem item;
+                while (it.hasNext()) {
+                    item = it.next();
+                    if (item.getId() == id) {
+                        it.remove();
+                        return true;
+                    }
+                }
+                return false;
+            }
+        };
+    }
+
+    public static QueueAccess NotInQueueAccess() {
+        return new QueueAccess() {
+            @Override
+            public boolean contains(long id) {
+                return false;
+            }
+
+            @Override
+            public boolean remove(long id) {
+                return false;
+            }
+        };
+
+    }
+
+}