From 12faad5115ebfb768e753bcfc38ac861d1d0a3bd Mon Sep 17 00:00:00 2001
From: =?utf8?q?Roland=20H=C3=A4der?= <roland@mxchange.org>
Date: Sun, 18 Mar 2018 22:05:28 +0100
Subject: [PATCH] Continued: - renamed ContactUtils -> Contacts - added public
 method Contacts.compare() for comparing two contact instances
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Signed-off-by: Roland Häder <roland@mxchange.org>
---
 .../{ContactUtils.java => Contacts.java}      | 32 +++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)
 rename src/org/mxchange/jcontacts/model/contact/{ContactUtils.java => Contacts.java} (92%)

diff --git a/src/org/mxchange/jcontacts/model/contact/ContactUtils.java b/src/org/mxchange/jcontacts/model/contact/Contacts.java
similarity index 92%
rename from src/org/mxchange/jcontacts/model/contact/ContactUtils.java
rename to src/org/mxchange/jcontacts/model/contact/Contacts.java
index d39444c..86d67dd 100644
--- a/src/org/mxchange/jcontacts/model/contact/ContactUtils.java
+++ b/src/org/mxchange/jcontacts/model/contact/Contacts.java
@@ -32,13 +32,41 @@ import org.mxchange.jphone.model.phonenumbers.mobileprovider.MobileProvider;
  * <p>
  * @author Roland Häder<roland@mxchange.org>
  */
-public class ContactUtils implements Serializable {
+public class Contacts implements Serializable {
 
 	/**
 	 * Serial number
 	 */
 	private static final long serialVersionUID = 26_785_734_719_670L;
 
+	/**
+	 * Compares both contact instances. This method returns -1 if second
+	 * instance is null.
+	 * <p>
+	 * @param contact1 Contact instance 1
+	 * @param contact2 Contact instance 2
+	 * <p>
+	 * @return Comparison value
+	 * <p>
+	 * @throws NullPointerException If first instance is null
+	 */
+	public static int compare (final Contact contact1, final Contact contact2) {
+		// Check euqality, then at least first must be given
+		if (Objects.equals(contact1, contact2)) {
+			// Both are same
+			return 0;
+		} else if (null == contact1) {
+			// First cannot be null
+			throw new NullPointerException("contact1 is null"); //NOI18N
+		} else if (null == contact2) {
+			// Second is null
+			return -1;
+		}
+
+		// Invoke compareTo() method
+		return contact1.compareTo(contact2);
+	}
+
 	/**
 	 * Copies all attributes from other contact object to this
 	 * <p>
@@ -268,7 +296,7 @@ public class ContactUtils implements Serializable {
 	/**
 	 * Private constructor for utilities
 	 */
-	private ContactUtils () {
+	private Contacts () {
 	}
 
 }
-- 
2.39.5