1 files changed, 68 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/utils/LazyInitializedList.java b/main/src/cgeo/geocaching/utils/LazyInitializedList.java
new file mode 100644
index 0000000..6061394
--- /dev/null
+++ b/main/src/cgeo/geocaching/utils/LazyInitializedList.java
@@ -0,0 +1,68 @@
+package cgeo.geocaching.utils;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public abstract class LazyInitializedList<ElementType> implements Iterable<ElementType> {
+
+    private List<ElementType> list;
+
+    public List<ElementType> get() {
+        initializeList();
+        return list;
+    }
+
+    private void initializeList() {
+        if (list == null) {
+            list = loadFromDatabase();
+        }
+    }
+
+    protected abstract List<ElementType> loadFromDatabase();
+
+    public void add(final ElementType element) {
+        initializeList();
+        list.add(element);
+    }
+
+    public void prepend(final ElementType element) {
+        initializeList();
+        list.add(0, element);
+    }
+
+    public void set(final List<ElementType> elements) {
+        list = new ArrayList<ElementType>(elements);
+    }
+
+    public boolean isEmpty() {
+        initializeList();
+        return list.isEmpty();
+    }
+
+    public ElementType remove(final int index) {
+        initializeList();
+        return list.remove(index);
+    }
+
+    public void add(int index, final ElementType element) {
+        initializeList();
+        list.add(index, element);
+    }
+
+    public int size() {
+        initializeList();
+        return list.size();
+    }
+
+    @Override
+    public Iterator<ElementType> iterator() {
+        initializeList();
+        return list.iterator();
+    }
+
+    public ElementType get(final int index) {
+        initializeList();
+        return list.get(index);
+    }
+}