Spatial partition pattern #562 (#828)

* Spatial partition

* Update pom.xml

* Update Bubble.java - pmd

* Update Rect.java - pmd

spatial-partition/src/main/java/com/iluwatar/spatialpartition/Point.java

@@ -0,0 +1,66 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.spatialpartition;
+
+import java.util.ArrayList;
+import java.util.Hashtable;
+
+/**
+ * The abstract Point class which will be extended by any object in the field
+ * whose location has to be kept track of. Defined by x,y coordinates and an id
+ * for easy hashing into hashtable.
+ * @param <T> T will be type subclass
+ */
+
+public abstract class Point<T> {
+
+  public int x; 
+  public int y; 
+  public final int id;
+  
+  Point(int x, int y, int id) {
+    this.x = x;
+    this.y = y;
+    this.id = id;
+  }
+
+  /**
+   * defines how the object moves
+   */
+  abstract void move();
+  
+  /**
+   * defines conditions for interacting with an object obj
+   * @param obj is another object on field which also extends Point
+   * @return whether the object can interact with the other or not
+   */
+  abstract boolean touches(T obj);
+  
+  /**
+   * handling interactions/collisions with other objects
+   * @param pointsToCheck contains the objects which need to be checked
+   * @param allPoints contains hashtable of all points on field at this time
+   */
+  abstract void handleCollision(ArrayList<Point> pointsToCheck, Hashtable<Integer, T> allPoints);
+}