Item merchant reference support

Adding support to the Item model, builder and Order builder to allow an individual merchant reference to each. Item

Author: oddprints-karl

src/main/java/com/oddprints/prodigi/pojos/Item.java

@@ -14,18 +14,25 @@ public class Item {
     private String sizing = "fillPrintArea";
     private List<Asset> assets;
     private Map<String, String> attributes;
+    private String merchantReference;
 
     public static class Builder {
         private List<Asset> builderAssets;
         private String builderSku;
         private Map<String, String> builderAttributes = new HashMap<>();
         private int builderCopies;
+        private String builderMerchantReference;
 
         public Builder(String sku, int copies) {
+            this(sku, copies, null);
+        }
+
+        public Builder(String sku, int copies, String merchantReference) {
             this.builderAssets = new ArrayList<>();
             this.builderSku = sku;
             builderAttributes.put("finish", "lustre"); // default
             builderCopies = copies;
+            builderMerchantReference = merchantReference;
         }
 
         public Builder addAsset(URL url) {
@@ -40,6 +47,7 @@ public Item build() {
             item.setSku(builderSku);
             item.setAttributes(builderAttributes);
             item.setCopies(builderCopies);
+            item.setMerchantReference(builderMerchantReference);
             return item;
         }
     }
@@ -54,6 +62,14 @@ public void setSku(String sku) {
         this.sku = sku;
     }
 
+    public String getMerchantReference() {
+        return merchantReference;
+    }
+
+    public void setMerchantReference(String merchantReference) {
+        this.merchantReference = merchantReference;
+    }
+
     public int getCopies() {
         return copies;
     }

src/main/java/com/oddprints/prodigi/pojos/Order.java

@@ -42,6 +42,12 @@ public Builder addImage(URL url, String sku, int copies) {
             return this;
         }
 
+        public Builder addImage(URL url, String sku, int copies, String itemMerchantReference) {
+            Item item = new Item.Builder(sku, copies, itemMerchantReference).addAsset(url).build();
+            builderItems.add(item);
+            return this;
+        }
+
         public Builder merchantReference(String merchantReference) {
             builderMerchantReference = merchantReference;
             return this;