Add Path.java from mc-dev for diff visibility

src/main/java/net/minecraft/server/Path.java

@@ -0,0 +1,128 @@
+package net.minecraft.server;
+
+public class Path {
+
+    private PathPoint[] a = new PathPoint[1024];
+    private int b = 0;
+
+    public Path() {}
+
+    public PathPoint a(PathPoint pathpoint) {
+        if (pathpoint.d >= 0) {
+            throw new IllegalStateException("OW KNOWS!");
+        } else {
+            if (this.b == this.a.length) {
+                PathPoint[] apathpoint = new PathPoint[this.b << 1];
+
+                System.arraycopy(this.a, 0, apathpoint, 0, this.b);
+                this.a = apathpoint;
+            }
+
+            this.a[this.b] = pathpoint;
+            pathpoint.d = this.b;
+            this.a(this.b++);
+            return pathpoint;
+        }
+    }
+
+    public void a() {
+        this.b = 0;
+    }
+
+    public PathPoint b() {
+        PathPoint pathpoint = this.a[0];
+
+        this.a[0] = this.a[--this.b];
+        this.a[this.b] = null;
+        if (this.b > 0) {
+            this.b(0);
+        }
+
+        pathpoint.d = -1;
+        return pathpoint;
+    }
+
+    public void a(PathPoint pathpoint, float f) {
+        float f1 = pathpoint.g;
+
+        pathpoint.g = f;
+        if (f < f1) {
+            this.a(pathpoint.d);
+        } else {
+            this.b(pathpoint.d);
+        }
+    }
+
+    private void a(int i) {
+        PathPoint pathpoint = this.a[i];
+
+        int j;
+
+        for (float f = pathpoint.g; i > 0; i = j) {
+            j = i - 1 >> 1;
+            PathPoint pathpoint1 = this.a[j];
+
+            if (f >= pathpoint1.g) {
+                break;
+            }
+
+            this.a[i] = pathpoint1;
+            pathpoint1.d = i;
+        }
+
+        this.a[i] = pathpoint;
+        pathpoint.d = i;
+    }
+
+    private void b(int i) {
+        PathPoint pathpoint = this.a[i];
+        float f = pathpoint.g;
+
+        while (true) {
+            int j = 1 + (i << 1);
+            int k = j + 1;
+
+            if (j >= this.b) {
+                break;
+            }
+
+            PathPoint pathpoint1 = this.a[j];
+            float f1 = pathpoint1.g;
+            PathPoint pathpoint2;
+            float f2;
+
+            if (k >= this.b) {
+                pathpoint2 = null;
+                f2 = Float.POSITIVE_INFINITY;
+            } else {
+                pathpoint2 = this.a[k];
+                f2 = pathpoint2.g;
+            }
+
+            if (f1 < f2) {
+                if (f1 >= f) {
+                    break;
+                }
+
+                this.a[i] = pathpoint1;
+                pathpoint1.d = i;
+                i = j;
+            } else {
+                if (f2 >= f) {
+                    break;
+                }
+
+                this.a[i] = pathpoint2;
+                pathpoint2.d = i;
+                i = k;
+            }
+        }
+
+        this.a[i] = pathpoint;
+        pathpoint.d = i;
+    }
+
+    public boolean c() {
+        return this.b == 0;
+    }
+}