add methods to search for nested folders and create them

forge-core/src/main/java/forge/util/storage/IStorage.java

@@ -29,21 +29,14 @@ import forge.util.IHasName;
  * @param <T> the generic type
  */
 public interface IStorage<T> extends Iterable<T>, IHasName {
-
     T get(final String name);
-
     T find(final Predicate<T> condition);
-    // todo: find(final Predicate<T> condition, boolean recursive).
-
     Collection<String> getItemNames();
-
     boolean contains(final String name);
-
     int size();
-
     void add(final T deck);
-
     void delete(final String deckName);
-
     IStorage<IStorage<T>> getFolders();
+    IStorage<T> tryGetFolder(String path);
+    IStorage<T> getFolderOrCreate(String path);
 }

forge-core/src/main/java/forge/util/storage/StorageBase.java

@@ -108,4 +108,14 @@ public class StorageBase<T> implements IStorage<T> {
         // TODO Auto-generated method stub
         return name;
     }
+
+    @Override
+    public IStorage<T> tryGetFolder(String path) {
+        throw new UnsupportedOperationException("This storage does not support subfolders");
+    }
+
+    @Override
+    public IStorage<T> getFolderOrCreate(String path) {
+        throw new UnsupportedOperationException("This storage does not support subfolders");
+    }
 }

forge-core/src/main/java/forge/util/storage/StorageImmediatelySerialized.java

@@ -22,6 +22,7 @@ import java.io.File;
 import com.google.common.base.Function;
 
 import forge.util.IItemSerializer;
+import forge.util.TextUtil;
 
 /**
  * <p>
@@ -89,4 +90,40 @@ public class StorageImmediatelySerialized<T> extends StorageBase<T> {
     public IStorage<IStorage<T>> getFolders() {
         return subfolders == null ? super.getFolders() : subfolders;
     }
+    
+    @Override
+    public IStorage<T> tryGetFolder(String path) {
+        String[] parts = TextUtil.split(path, '/', 2);
+        switch( parts.length ) {
+            case 0: return this;
+            case 1: return parts[0].equals(".") ? this : getFolders().get(parts[0]);
+            case 2:
+                IStorage<T> subFolder = getFolders().get(parts[0]);
+                return subFolder == null ? null : subFolder.tryGetFolder(parts[1]);
+        }
+     // should not reach this unless split is broken
+        throw new IllegalArgumentException(path); 
+    }
+
+    @Override
+    public IStorage<T> getFolderOrCreate(String path) {
+        String[] parts = TextUtil.split(path, '/', 2);
+        switch( parts.length ) {
+            case 0: return this;
+            case 1: return parts[0].equals(".") ? this : getOrCreateSubfolder(parts[0]);
+            case 2: return getOrCreateSubfolder(parts[0]).getFolderOrCreate(parts[1]);
+        }
+     // should not reach this unless split is broken
+        throw new IllegalArgumentException(path); 
+    }
+    
+    private IStorage<T> getOrCreateSubfolder(String name) {
+        // Have to filter name for incorrect symbols 
+        IStorage<T> storage = getFolders().get(name);
+        if( null == storage ) {
+            storage = new StorageImmediatelySerialized<>(name, serializer);
+            subfolders.add(storage);
+        }
+        return storage;
+    }
 }