Add functionality for visibility of /OCMD /P (#682)

* Add PDOCMDDictionary class

* Add isContainsName method to PDOptionalContentPropeties

Author: LonelyMidoriya

src/main/java/org/verapdf/as/ASAtom.java

@@ -60,13 +60,17 @@ public class ASAtom implements Comparable<ASAtom> {
     public static final ASAtom AF_RELATIONSHIP = new ASAtom("AFRelationship");
     public static final ASAtom AFTER = new ASAtom("After");
     public static final ASAtom AIS = new ASAtom("AIS");
-    public static final ASAtom ALT = new ASAtom("Alt");
+    public static final ASAtom ALL_OFF = new ASAtom("AllOff");
+    public static final ASAtom ALL_ON = new ASAtom("AllOn");
     public static final ASAtom ALPHA = new ASAtom("Alpha");
+    public static final ASAtom ALT = new ASAtom("Alt");
     public static final ASAtom ALTERNATE = new ASAtom("Alternate");
     public static final ASAtom ALTERNATES = new ASAtom("Alternates");
     public static final ASAtom ANNOT = new ASAtom("Annot");
     public static final ASAtom ANNOTS = new ASAtom("Annots");
     public static final ASAtom ANTI_ALIAS = new ASAtom("AntiAlias");
+    public static final ASAtom ANY_OFF = new ASAtom("AnyOff");
+    public static final ASAtom ANY_ON = new ASAtom("AnyOn");
     public static final ASAtom AP = new ASAtom("AP");
     public static final ASAtom AP_REF = new ASAtom("APRef");
     public static final ASAtom APP = new ASAtom("App");
@@ -408,6 +412,7 @@ public class ASAtom implements Comparable<ASAtom> {
     public static final ASAtom OBJR = new ASAtom("OBJR");
     public static final ASAtom OBJ_STM = new ASAtom("ObjStm");
     public static final ASAtom OC = new ASAtom("OC");
+    public static final ASAtom OCMD = new ASAtom("OCMD");
     public static final ASAtom OCG = new ASAtom("OCG");
     public static final ASAtom OCGS = new ASAtom("OCGs");
     public static final ASAtom OCPROPERTIES = new ASAtom("OCProperties");

src/main/java/org/verapdf/pd/optionalcontent/PDOCMDDictionary.java

@@ -0,0 +1,37 @@
+package org.verapdf.pd.optionalcontent;
+
+import org.verapdf.as.ASAtom;
+import org.verapdf.cos.COSArray;
+import org.verapdf.cos.COSBase;
+import org.verapdf.cos.COSObjType;
+import org.verapdf.cos.COSObject;
+
+public class PDOCMDDictionary {
+    public static boolean isVisibleOCMDByP(COSBase property, PDOptionalContentProperties optProperties) {
+        COSObject ocgProperty = property.getKey(ASAtom.OCGS);
+        if (ocgProperty == null || ocgProperty.getType() != COSObjType.COS_ARRAY) {
+            return true;
+        }
+        COSArray ocgs = (COSArray) ocgProperty.getDirectBase();
+        ASAtom pValue = property.getNameKey(ASAtom.P);
+        for (COSObject obj : ocgs) {
+            boolean isVisible = optProperties.isVisibleLayer(obj.getStringKey(ASAtom.NAME));
+            if (isVisible) {
+                if (pValue == null || ASAtom.ANY_ON.equals(pValue)) {
+                    return true;
+                }
+                if (ASAtom.ALL_OFF.equals(pValue)) {
+                    return false;
+                }
+            } else {
+                if (ASAtom.ALL_ON.equals(pValue)) {
+                    return false;
+                }
+                if (ASAtom.ANY_OFF.equals(pValue)) {
+                    return true;
+                }
+            }
+        }
+        return ASAtom.ALL_OFF.equals(pValue) || ASAtom.ALL_ON.equals(pValue);
+    }
+}

src/main/java/org/verapdf/pd/optionalcontent/PDOptionalContentProperties.java

@@ -21,10 +21,7 @@
 package org.verapdf.pd.optionalcontent;
 
 import org.verapdf.as.ASAtom;
-import org.verapdf.cos.COSArray;
-import org.verapdf.cos.COSDictionary;
-import org.verapdf.cos.COSObjType;
-import org.verapdf.cos.COSObject;
+import org.verapdf.cos.*;
 import org.verapdf.pd.PDObject;
 
 import java.util.ArrayList;
@@ -55,6 +52,21 @@ public List<String> getGroupNames() {
         return groups;
 	}
 
+    public boolean isContainsName(String name) {
+        if (name == null) {
+            return false;
+        }
+        COSObject ocgs = getObject().getKey(ASAtom.OCGS);
+        if (!ocgs.empty() && ocgs.getType() == COSObjType.COS_ARRAY) {
+            for (COSObject obj : (COSArray) ocgs.getDirectBase()) {
+                if (!obj.empty() && obj.getType() == COSObjType.COS_DICT && name.equals(obj.getStringKey(ASAtom.NAME))) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     public boolean isVisibleLayer(String name) {
         if (name == null) {
             return true;