Adds deque and queue support JSON plugin

plugins/json/src/main/java/org/apache/struts2/json/JSONPopulator.java

@@ -207,6 +207,8 @@ public class JSONPopulator {
                     newCollection = new TreeSet();
                 } else if (Set.class.isAssignableFrom(clazz)) {
                     newCollection = new HashSet();
+                } else if (Queue.class.isAssignableFrom(clazz)) {
+                    newCollection = new ArrayDeque();
                 } else {
                     newCollection = new ArrayList();
                 }

plugins/json/src/test/java/org/apache/struts2/json/JSONPopulatorTest.java

@@ -127,6 +127,16 @@ public class JSONPopulatorTest extends TestCase {
         assertEquals("A", bean.getNavigableSetField().first());
         assertEquals(true, bean.getNavigableSetField().contains("B"));
         assertEquals("C", bean.getNavigableSetField().last());
+
+        assertEquals(3, bean.getQueueField().size());
+        assertEquals("A", bean.getQueueField().poll());
+        assertEquals("B", bean.getQueueField().poll());
+        assertEquals("C", bean.getQueueField().poll());
+
+        assertEquals(3, bean.getDequeField().size());
+        assertEquals("A", bean.getDequeField().pollFirst());
+        assertEquals("B", bean.getDequeField().pollFirst());
+        assertEquals("C", bean.getDequeField().pollFirst());
     }
 
     public void testObjectBeanWithStrings() throws Exception {

plugins/json/src/test/java/org/apache/struts2/json/WrapperClassBean.java

@@ -18,9 +18,11 @@
  */
 package org.apache.struts2.json;
 
+import java.util.Deque;
 import java.util.List;
 import java.util.Map;
 import java.util.NavigableSet;
+import java.util.Queue;
 import java.util.Set;
 import java.util.SortedSet;
 
@@ -46,6 +48,8 @@ public class WrapperClassBean {
     private Set<String> setField;
     private SortedSet<String> sortedSetField;
     private NavigableSet<String> navigableSetField;
+    private Queue<String> queueField;
+    private Deque<String> dequeField;
 
     public List<SimpleValue> getListField() {
         return listField;
@@ -103,6 +107,22 @@ public class WrapperClassBean {
         this.navigableSetField = navigableSetField;
     }
 
+    public Queue<String> getQueueField() {
+        return queueField;
+    }
+
+    public void setQueueField(Queue<String> queueField) {
+        this.queueField = queueField;
+    }
+
+    public Deque<String> getDequeField() {
+        return dequeField;
+    }
+
+    public void setDequeField(Deque<String> dequeField) {
+        this.dequeField = dequeField;
+    }
+
     public Boolean getBooleanField() {
         return booleanField;
     }

plugins/json/src/test/resources/org/apache/struts2/json/json-7.txt

@@ -19,5 +19,7 @@
         "arrayMapField": [{"id1":2073501,"id2":3}],
         "setField": ["A", "C", "B"],
         "sortedSetField": ["A", "C", "B"],
-        "navigableSetField": ["A", "B", "C"]
+        "navigableSetField": ["A", "B", "C"],
+        "queueField": ["A", "B", "C"],
+        "dequeField": ["A", "B", "C"]
 }