Implement hashCode where missing.

Author: cpovirk

src/com/google/common/geometry/ParametrizedS2Point.java

@@ -55,7 +55,6 @@ public int compareTo(ParametrizedS2Point o) {
     return point.compareTo(o.point);
   }
 
-  @SuppressWarnings("EqualsHashCode")
   @Override
   public boolean equals(Object other) {
     if (other instanceof ParametrizedS2Point) {
@@ -65,4 +64,11 @@ public boolean equals(Object other) {
       return false;
     }
   }
+
+  @Override
+  public int hashCode() {
+    // TODO(jrosenstock): Use Objects.hash when API 19 (2014-06) is allowed.  Current min is 14
+    // (2011-10).  Double.hashCode requires an even higher API level, so just hash the point.
+    return point.hashCode();
+  }
 }

src/com/google/common/geometry/S2RegionIntersection.java

@@ -99,12 +99,16 @@ public boolean mayIntersect(S2Cell cell) {
    * NOTE: This should be rewritten to disregard order if such functionality is ever required.
    */
   @Override
-  @SuppressWarnings("EqualsHashCode")
   public boolean equals(Object thatObject) {
     if (!(thatObject instanceof S2RegionIntersection)) {
       return false;
     }
     S2RegionIntersection that = (S2RegionIntersection) thatObject;
     return Arrays.deepEquals(regions, that.regions);
   }
+
+  @Override
+  public int hashCode() {
+    return Arrays.hashCode(regions);
+  }
 }

src/com/google/common/geometry/S2RegionUnion.java

@@ -104,12 +104,16 @@ public boolean mayIntersect(S2Cell cell) {
    * should be rewritten to disregard order if such functionality is ever required.
    */
   @Override
-  @SuppressWarnings("EqualsHashCode")
   public boolean equals(Object thatObject) {
     if (!(thatObject instanceof S2RegionUnion)) {
       return false;
     }
     S2RegionUnion that = (S2RegionUnion) thatObject;
     return Arrays.deepEquals(regions, that.regions);
   }
+
+  @Override
+  public int hashCode() {
+    return Arrays.hashCode(regions);
+  }
 }