X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2Forg%2Fmxchange%2Fjfinancials%2Fmodel%2Freceipt%2FReceipts.java;h=a2f6d8a317f78d5951f292616b8215ca269d3184;hb=4269f830856a18f6c65f1ba5ced59db10bfd4de3;hp=24fb923a928acbfcdc6b36197dfacf2153eb528b;hpb=7cae5a73ec5548541256567d5ffe364e5fd510b1;p=jfinancials-core.git

diff --git a/src/org/mxchange/jfinancials/model/receipt/Receipts.java b/src/org/mxchange/jfinancials/model/receipt/Receipts.java
index 24fb923..a2f6d8a 100644
--- a/src/org/mxchange/jfinancials/model/receipt/Receipts.java
+++ b/src/org/mxchange/jfinancials/model/receipt/Receipts.java
@@ -32,6 +32,42 @@ public class Receipts implements Serializable {
 	 */
 	private static final long serialVersionUID = 2_867_938_676_165_401L;
 
+	/**
+	 * Compares both receipt instances. This method returns -1 if second
+	 * instance is null.
+	 * <p>
+	 * @param receipt1 BillableReceipt instance 1
+	 * @param receipt2 BillableReceipt instance 2
+	 * <p>
+	 * @return Comparison value
+	 */
+	public static int compare (final BillableReceipt receipt1, final BillableReceipt receipt2) {
+		// Check euqality, then at least first must be given
+		if (Objects.equals(receipt1, receipt2)) {
+			// Both are same
+			return 0;
+		} else if (null == receipt1) {
+			// First is null
+			return -1;
+		} else if (null == receipt2) {
+			// Second is null
+			return 1;
+		}
+
+		// Invoke compareTo() method
+		return receipt1.compareTo(receipt2);
+	}
+
+	/**
+	 * Checks whether both receipts are the same, means not true entity equality
+	 * but if the receipt in general terms does already exist. A pre-check on
+	 * entity equality is however performed to avoid below much longer code.
+	 * <p>
+	 * @param receipt1 BillableReceipt instance 1
+	 * @param receipt2 BillableReceipt instance 2
+	 * <p>
+	 * @return Whether both receipts are the same (not instances)
+	 */
 	public static boolean isSameReceipt (final BillableReceipt receipt1, final BillableReceipt receipt2) {
 		// Pre-compare both as entities (same id)
 		if (Objects.equals(receipt1, receipt2)) {
@@ -58,7 +94,7 @@ public class Receipts implements Serializable {
 		} else if ((receipt1.getReceiptNumber() != null) && (receipt1.getReceiptNumber().isEmpty())) {
 			// Throw IAE
 			throw new IllegalArgumentException("receipt1.receiptNumber is empty.");
-		} else if (receipt1.getReceiptPaymentType()== null) {
+		} else if (receipt1.getReceiptPaymentType() == null) {
 			// Throw NPE
 			throw new NullPointerException("receipt1.receiptPaymentType is null");
 		} else if (null == receipt2) {
@@ -79,7 +115,7 @@ public class Receipts implements Serializable {
 		} else if ((receipt2.getReceiptNumber() != null) && (receipt2.getReceiptNumber().isEmpty())) {
 			// Throw IAE
 			throw new IllegalArgumentException("receipt2.receiptNumber is empty.");
-		} else if (receipt2.getReceiptPaymentType()== null) {
+		} else if (receipt2.getReceiptPaymentType() == null) {
 			// Throw NPE
 			throw new NullPointerException("receipt2.receiptPaymentType is null");
 		}