From 47de23b97f65b9c97e7bce4bb2f4a496e5190bea Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Tue, 15 Mar 2016 20:36:43 +0100
Subject: Make filters and mappers static for easier future state computation

---
 src/ch/epfl/xblast/server/GameState.java | 51 ++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 12 deletions(-)

(limited to 'src')

diff --git a/src/ch/epfl/xblast/server/GameState.java b/src/ch/epfl/xblast/server/GameState.java
index cbe29b5..d750732 100644
--- a/src/ch/epfl/xblast/server/GameState.java
+++ b/src/ch/epfl/xblast/server/GameState.java
@@ -27,7 +27,42 @@ public final class GameState {
     private final List<Sq<Cell>> blasts;
 
     /**
-     * Compute the next state of a blast.
+     * Filters the given list of players and returns the lively ones.
+     *
+     * @param players a list of players
+     * @return the list of alive players
+     */
+    private static List<Player> alivePlayers(List<Player> players) {
+        return players.stream()
+                .filter(Player::isAlive)
+                .collect(Collectors.toList());
+    }
+
+    /**
+     * Maps the given bombs to their position.
+     *
+     * @param bombs a list of bombs
+     * @return a map of positions and their bombs
+     */
+    private static Map<Cell, Bomb> bombedCells(List<Bomb> bombs) {
+        return bombs.stream()
+                .collect(Collectors.toMap(Bomb::position, Function.identity()));
+    }
+
+    /**
+     * Returns a set of cells that contains at least one blast in the given blasts sequences.
+     *
+     * @param blasts the list of blast sequences
+     * @return the set of blasted cells
+     */
+    private static Set<Cell> blastedCells(List<Sq<Cell>> blasts) {
+        return blasts.stream()
+                .map(Sq::head)
+                .collect(Collectors.toSet());
+    }
+
+    /**
+     * Computes the next state of a blast.
      *
      * @param blasts0     existing particles
      * @param board0      the game's board
@@ -194,10 +229,7 @@ public final class GameState {
      * @return a list of the alive players
      */
     public List<Player> alivePlayers() {
-        return this.players
-                .stream()
-                .filter(Player::isAlive)
-                .collect(Collectors.toList());
+        return GameState.alivePlayers(this.players);
     }
 
     /**
@@ -206,9 +238,7 @@ public final class GameState {
      * @return the map of bombs
      */
     public Map<Cell, Bomb> bombedCells() {
-        return this.bombs
-                .stream()
-                .collect(Collectors.toMap(Bomb::position, Function.identity()));
+        return GameState.bombedCells(this.bombs);
     }
 
     /**
@@ -217,10 +247,7 @@ public final class GameState {
      * @return the set of blasted cells
      */
     public Set<Cell> blastedCells() {
-        return this.blasts
-                .stream()
-                .map(Sq::head)
-                .collect(Collectors.toSet());
+        return GameState.blastedCells(this.blasts);
     }
 
     /**
-- 
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