Add toString, equals, hashCode in JsonMergePatch

Signed-off-by: Jorge Bescos Gascon <jorge.bescos.gascon@oracle.com>

impl/src/main/java/org/eclipse/parsson/JsonMergePatchImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2022 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -113,5 +113,38 @@ static JsonValue diff(JsonValue source, JsonValue target) {
         return builder.build();
     }
 
+    /**
+     * Compares this {@code JsonMergePatchImpl} with another object.
+     * @param obj the object to compare this {@code JsonMergePatchImpl} against
+     * @return true if the given object is a {@code JsonMergePatchImpl} with the same
+     * reference tokens as this one, false otherwise.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || obj.getClass() != JsonMergePatchImpl.class)
+            return false;
+        return patch.equals(((JsonMergePatchImpl)obj).patch);
+    }
+
+    /**
+     * Returns the hash code value for this {@code JsonMergePatchImpl}.
+     *
+     * @return the hash code value for this {@code JsonMergePatchImpl} object
+     */
+    @Override
+    public int hashCode() {
+        return patch.hashCode();
+    }
+
+    /**
+     * Returns the JSON Patch text
+     * @return the JSON Patch text
+     */
+    @Override
+    public String toString() {
+        return patch.toString();
+    }
 }
 

impl/src/test/java/org/eclipse/parsson/tests/JsonMergePatch2Test.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.eclipse.parsson.tests;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import jakarta.json.Json;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonMergePatch;
+import jakarta.json.JsonPatch;
+
+public class JsonMergePatch2Test {
+
+    @Test
+    public void testToString() {
+        JsonArray jsonArray = Json.createArrayBuilder().add(Json.createValue(1)).build();
+        JsonPatch jsonPatch = Json.createPatchBuilder(jsonArray).build();
+        assertEquals("[1]", jsonPatch.toString());
+        JsonMergePatch jsonMergePatch = Json.createMergePatch(jsonArray);
+        assertEquals("[1]", jsonMergePatch.toString());
+    }
+}