Implemented content based syncing

src/main/java/ru/bclib/util/Pair.java

@@ -1,11 +1,31 @@
 package ru.bclib.util;
 
-public class Pair <A, B>{
-    public final A first;
-    public final B second;
+import java.util.Objects;
 
-    public Pair(A first, B second) {
-        this.first = first;
-        this.second = second;
-    }
+public class Pair<A, B> {
+	public final A first;
+	public final B second;
+	
+	public Pair(A first, B second) {
+		this.first = first;
+		this.second = second;
+	}
+	
+	@Override
+	public String toString() {
+		return "Pair{" + "first=" + first + ", second=" + second + '}';
+	}
+	
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (!(o instanceof Pair)) return false;
+		Pair<?, ?> pair = (Pair<?, ?>) o;
+		return Objects.equals(first, pair.first) && Objects.equals(second, pair.second);
+	}
+	
+	@Override
+	public int hashCode() {
+		return Objects.hash(first, second);
+	}
 }