Simplified factory classes.

Author: jdereg

pom.xml

@@ -30,7 +30,7 @@
         <!-- testing only -->
         <version.junit-jupiter-params>5.10.0</version.junit-jupiter-params>
         <version.assertj-core>3.24.2</version.assertj-core>
-        <version.java-util>2.19.0</version.java-util>
+        <version.java-util>3.0.0</version.java-util>
         <version.gson>2.11.0</version.gson>
         <version.jackson-core>2.18.0</version.jackson-core>
 

src/main/java/com/cedarsoftware/io/factory/EmptyEnumerationFactory.java

@@ -0,0 +1,60 @@
+package com.cedarsoftware.io.factory;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.NavigableSet;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.SortedSet;
+
+import com.cedarsoftware.io.JsonIoException;
+import com.cedarsoftware.io.JsonObject;
+import com.cedarsoftware.io.JsonReader;
+import com.cedarsoftware.io.Resolver;
+
+/**
+ * @author John DeRegnaucourt ([email protected])
+ *         <br>
+ *         Copyright (c) Cedar Software LLC
+ *         <br><br>
+ *         Licensed under the Apache License, Version 2.0 (the "License");
+ *         you may not use this file except in compliance with the License.
+ *         You may obtain a copy of the License at
+ *         <br><br>
+ *         <a href="http://www.apache.org/licenses/LICENSE-2.0">License</a>
+ *         <br><br>
+ *         Unless required by applicable law or agreed to in writing, software
+ *         distributed under the License is distributed on an "AS IS" BASIS,
+ *         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *         See the License for the specific language governing permissions and
+ *         limitations under the License.
+ */
+public class EmptyFactory implements JsonReader.ClassFactory {
+    public Object newInstance(Class<?> c, JsonObject jObj, Resolver resolver) {
+        if (NavigableSet.class.isAssignableFrom(c) || SortedSet.class.isAssignableFrom(c)) {
+            return Collections.emptyNavigableSet();
+        } else if (Set.class.isAssignableFrom(c)) {
+            return Collections.emptySet();
+        } else if (List.class.isAssignableFrom(c) || Collection.class.isAssignableFrom(c)) {
+            return Collections.emptyList();
+        } else if (NavigableMap.class.isAssignableFrom(c) || SortedMap.class.isAssignableFrom(c)) {
+            return Collections.emptyNavigableMap();
+        } else if (Map.class.isAssignableFrom(c)) {
+            return Collections.emptyMap();
+        } else if (ListIterator.class.isAssignableFrom(c)) {
+            return Collections.emptyListIterator();
+        } else if (Iterator.class.isAssignableFrom(c)) {
+            return Collections.emptyIterator();
+        } else if (Enumeration.class.isAssignableFrom(c)) {
+            return Collections.emptyEnumeration();
+        }
+        throw new JsonIoException("EmptyFactory handed Class for which it was not expecting: " + c.getName());
+    }
+}
+