From 5a45593914a7f96f5d6dfe8526caa5dcc34ac16a Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Tue, 24 Nov 2015 18:36:44 +0100
Subject: Add World-aware case reducer

---
 .../physical/stragegies/reducer/CaseReducer.java   | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/ch/epfl/maze/physical/stragegies/reducer/CaseReducer.java

diff --git a/src/ch/epfl/maze/physical/stragegies/reducer/CaseReducer.java b/src/ch/epfl/maze/physical/stragegies/reducer/CaseReducer.java
new file mode 100644
index 0000000..837bd4b
--- /dev/null
+++ b/src/ch/epfl/maze/physical/stragegies/reducer/CaseReducer.java
@@ -0,0 +1,33 @@
+package ch.epfl.maze.physical.stragegies.reducer;
+
+import ch.epfl.maze.physical.World;
+import ch.epfl.maze.util.Direction;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * A filter reducer filtering possibilities case by case.
+ *
+ * @author Pacien TRAN-GIRARD
+ */
+public interface CaseReducer extends ChoiceReducer {
+
+    /**
+     * Checks if the given choice should be kept or excluded by the filter.
+     *
+     * @param choice A Direction
+     * @param world  The World
+     * @return T(The filter should keep the given choice)
+     */
+    boolean keepChoice(Direction choice, World world);
+
+    @Override
+    default Set<Direction> reduce(Set<Direction> choices, World world) {
+        return choices
+                .stream()
+                .filter(choice -> this.keepChoice(choice, world))
+                .collect(Collectors.toSet());
+    }
+
+}
-- 
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