ActionWithResult interface, ActionWithBooleanResult.

Mage.Common/src/mage/interfaces/ActionWithResult.java

@@ -0,0 +1,25 @@
+package mage.interfaces;
+
+/**
+ * /**
+ * Light weight action interface
+ * For executing actions without any context.
+ *
+ * @param <T> Type to return as a result of execution.
+ *
+ * @author noxx
+ */
+public interface ActionWithResult<T> {
+
+    /**
+     * Executes and returns result.
+     * @return
+     */
+    public T execute();
+
+    /**
+     * Returns negative result specific for type <T>.
+     * @return
+     */
+    public T negativeResult();
+}

Mage.Common/src/mage/utils/ActionWithBooleanResult.java

@@ -0,0 +1,13 @@
+package mage.utils;
+
+import mage.interfaces.ActionWithResult;
+
+/**
+ * @author noxx
+ */
+public abstract class ActionWithBooleanResult implements ActionWithResult<Boolean> {
+    @Override
+    public Boolean negativeResult() {
+        return false;
+    }
+}