equals and hashcode for Either and Pair

common/src/main/java/com/dfsek/terra/api/util/generic/either/Either.java

@@ -49,4 +49,21 @@ public final class Either<L, R> {
     public boolean hasRight() {
         return !leftPresent;
     }
+
+    @Override
+    public int hashCode() {
+        if(hasLeft()) return left.hashCode();
+        return right.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(!(o instanceof Either<?, ?>)) return false;
+
+        Either<?, ?> that = (Either<?, ?>) o;
+
+        if(hasLeft() && that.hasLeft()) return left.equals(that.left);
+        if(hasRight() && that.hasRight()) return right.equals(that.right);
+        return false;
+    }
 }

common/src/main/java/com/dfsek/terra/api/util/generic/pair/ImmutablePair.java

@@ -1,5 +1,7 @@
 package com.dfsek.terra.api.util.generic.pair;
 
+import java.util.Objects;
+
 public class ImmutablePair<L, R> {
     private final L left;
     private final R right;
@@ -24,4 +26,15 @@ public class ImmutablePair<L, R> {
     public Pair<L, R> mutable() {
         return new Pair<>(left, right);
     }
+    @Override
+    public int hashCode() {
+        return Objects.hash(left, right);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(!(o instanceof ImmutablePair)) return false;
+        ImmutablePair<?, ?> that = (ImmutablePair<?, ?>) o;
+        return that.left.equals(left) && that.right.equals(right);
+    }
 }

common/src/main/java/com/dfsek/terra/api/util/generic/pair/Pair.java

@@ -1,5 +1,7 @@
 package com.dfsek.terra.api.util.generic.pair;
 
+import java.util.Objects;
+
 public class Pair<L, R> {
     private L left;
     private R right;
@@ -32,4 +34,16 @@ public class Pair<L, R> {
     public ImmutablePair<L, R> immutable() {
         return new ImmutablePair<>(left, right);
     }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(left, right);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(!(o instanceof Pair)) return false;
+        Pair<?, ?> that = (Pair<?, ?>) o;
+        return that.left.equals(left) && that.right.equals(right);
+    }
 }