A Callable that just returns some Value.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2547 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/util/ValueCallable.java

@@ -0,0 +1,39 @@
+//
+// $Id$
+
+package com.samskivert.util;
+
+import java.util.concurrent.Callable;
+
+/**
+ * A Callable that just returns a predefined value.
+ */
+public class ValueCallable<V>
+    implements Callable<V>
+{
+    /**
+     * Factory to create a ValueCallable from a value while avoiding having to specify the type.
+     * TODO: I think I want <? super V> in the return value, not sure how to make it.
+     */
+    public static <V> ValueCallable<V> create (V value)
+    {
+        return new ValueCallable<V>(value);
+    }
+
+    /**
+     * Construct a ValueCallable.
+     */
+    public ValueCallable (V value)
+    {
+        _value = value;
+    }
+
+    // from interface Callable
+    public V call ()
+    {
+        return _value;
+    }
+
+    /** The value we'll be returning. */
+    protected V _value;
+}