1 files changed, 40 insertions, 0 deletions
diff --git a/src/com/p4square/grow/provider/DelegateProvider.java b/src/com/p4square/grow/provider/DelegateProvider.java
new file mode 100644
index 0000000..66c5666
--- /dev/null
+++ b/src/com/p4square/grow/provider/DelegateProvider.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2014 Jesse Morgan
+ */
+
+package com.p4square.grow.provider;
+
+import java.io.IOException;
+
+/**
+ * DelegateProvider wraps an existing Provider an transforms the key from
+ * type K to type D.
+ *
+ * @author Jesse Morgan <jesse@jesterpm.net>
+ */
+public abstract class DelegateProvider<K, D, V> implements Provider<K, V> {
+
+    private Provider<D, V> mProvider;
+
+    public DelegateProvider(final Provider<D, V> provider) {
+        mProvider = provider;
+    }
+
+    @Override
+    public V get(final K key) throws IOException {
+        return mProvider.get(makeKey(key));
+    }
+
+    @Override
+    public void put(final K key, final V obj) throws IOException {
+        mProvider.put(makeKey(key), obj);
+    }
+
+    /**
+     * Make a Key for questionId.
+     *
+     * @param questionId The question id.
+     * @return a key for questionId.
+     */
+    protected abstract D makeKey(final K input);
+}