Page parameter of item list is now aware of different lists

ccm-cms/src/main/java/org/librecms/pages/models/ItemListModel.java

@@ -60,6 +60,7 @@ import org.librecms.contentsection.privileges.ItemPrivileges;
 import com.arsdigita.kernel.KernelConfig;
 
 import java.util.Arrays;
+import java.util.stream.Stream;
 
 /**
  *
@@ -87,6 +88,8 @@ public class ItemListModel {
 
     private static final int PAGE_SIZE_DEFAULT = 20;
 
+    private static final String PAGE_PARAM_NAME = "page";
+
     @Inject
     private CategoryModel categoryModel;
 
@@ -158,7 +161,8 @@ public class ItemListModel {
                         )
                 ),
                 getListOrderSetting(listName),
-                getPageSizeSetting(listName)
+                getPageSizeSetting(listName),
+                getOffset(listName, getPageSizeSetting(listName))
             )
         );
     }
@@ -167,7 +171,8 @@ public class ItemListModel {
         final Class<? extends ContentItem> limitToType,
         final List<Category> categories,
         final List<String> listOrder,
-        final int pageSize
+        final int pageSize,
+        final int offset
     ) {
         final CriteriaBuilder criteriaBuilder = entityManager
             .getCriteriaBuilder();
@@ -212,7 +217,7 @@ public class ItemListModel {
                     item, globalizationHelper.getNegotiatedLocale()
                 )
             )
-            .skip(getOffset(pageSize))
+            .skip(offset)
             .limit(pageSize)
             .map(this::buildListItemModel)
             .collect(Collectors.toList());
@@ -362,16 +367,36 @@ public class ItemListModel {
         }
     }
 
-    private int getOffset(final int pageSize) {
-        if (pageUrlModel.getQueryParameters().containsKey("page")) {
-            final String value = pageUrlModel.getQueryParameters().get("page");
-            if (value.matches("\\d*")) {
-                final int page = Integer.valueOf(value);
+    private int getOffset(final String listName, final int pageSize) {
+        final String pageParamName = Stream
+            .of(listName, PAGE_PARAM_NAME)
+            .filter(token -> token != null && !token.isBlank())
+            .collect(
+                Collectors.joining(".")
+            );
 
-                return page * pageSize;
-            } else {
-                return 0;
-            }
+        if (pageUrlModel.getQueryParameters().containsKey(pageParamName)) {
+            return calculateOffset(pageParamName, pageSize);
+        } else if (pageUrlModel.getQueryParameters().containsKey(PAGE_PARAM_NAME)) {
+            return calculateOffset(PAGE_PARAM_NAME, pageSize);
+        } else {
+            return 0;
+        }
+    }
+    
+    private int calculateOffset(
+        final String pageParamName,
+        final int pageSize
+    ) {
+        return parsePageParam(pageParamName) * pageSize;
+    }
+
+    private int parsePageParam(final String pageParamName) {
+        final String value = pageUrlModel
+            .getQueryParameters()
+            .get(pageParamName);
+        if (value.matches("\\d+")) {
+            return Integer.parseUnsignedInt(value);
         } else {
             return 0;
         }
@@ -436,13 +461,12 @@ public class ItemListModel {
         final String listName,
         final String settingKey
     ) {
-        return List
+        return Stream
             .of(
                 ITEM_LIST_SETTINGS_PREFIX,
                 listName,
                 settingKey
             )
-            .stream()
             .filter(token -> token != null && !token.isBlank())
             .collect(
                 Collectors.joining(".")