Implements Page "/Tabs" getter/setters

src/main/java/org/sejda/sambox/cos/COSName.java

@@ -506,6 +506,7 @@ public final class COSName extends COSBase implements Comparable<COSName>
     public static final COSName SW = newCommonInstance("SW");
     // T
     public static final COSName T = newCommonInstance("T");
+    public static final COSName Tabs = newCommonInstance("Tabs");
     public static final COSName TARGET = newCommonInstance("Target");
     public static final COSName TEMPLATES = newCommonInstance("Templates");
     public static final COSName THREADS = newCommonInstance("Threads");

src/main/java/org/sejda/sambox/pdmodel/PDPage.java

@@ -54,6 +54,7 @@
 import org.sejda.sambox.pdmodel.interactive.action.PDPageAdditionalActions;
 import org.sejda.sambox.pdmodel.interactive.annotation.AnnotationFilter;
 import org.sejda.sambox.pdmodel.interactive.annotation.PDAnnotation;
+import org.sejda.sambox.pdmodel.interactive.form.Tabs;
 import org.sejda.sambox.pdmodel.interactive.measurement.PDViewportDictionary;
 import org.sejda.sambox.pdmodel.interactive.pagenavigation.PDThreadBead;
 import org.sejda.sambox.pdmodel.interactive.pagenavigation.PDTransition;
@@ -938,4 +939,20 @@ public COSDictionary getPageTreeParent()
     {
         return pageTreeParent;
     }
+
+    public Tabs getTabs()
+    {
+        return Tabs.fromString(page.getString(COSName.Tabs));
+    }
+
+    public void setTabs(Tabs value)
+    {
+        if (value == null)
+        {
+            page.removeItem(COSName.Tabs);
+            return;
+        }
+
+        page.setString(COSName.Tabs, value.stringValue());
+    }
 }

src/main/java/org/sejda/sambox/pdmodel/interactive/form/Tabs.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+package org.sejda.sambox.pdmodel.interactive.form;
+
+public enum Tabs { 
+    ROW_ORDER("R"),
+    COLUMN_ORDER("C"),
+    STRUCTURE_ORDER("S");
+
+    public static Tabs fromString(String value)
+    {
+        if (value == null)
+        {
+            return null;
+        }
+
+        for (Tabs instance : Tabs.values())
+        {
+            if (instance.value.equals(value))
+            {
+                return instance;
+            }
+        }
+
+        return null;
+    }
+
+    private final String value;
+
+    Tabs(String value)
+    {
+        this.value = value;
+    }
+
+    public String stringValue()
+    {
+        return value;
+    }
+}