Fix a potential bug caused by the wrong implementation of compareTo method in ObjectElement

2 files changed, 10 insertions, 13 deletions

diff --git a/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectCollectionFactory.java b/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectCollectionFactory.java
index 56fc052..17eddaf 100644
--- a/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectCollectionFactory.java
+++ b/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectCollectionFactory.java
@@ -9,8 +9,8 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.concurrent.ConcurrentSkipListSet;
 import java.util.function.Consumer;
 import java.util.function.Supplier;
 
@@ -25,20 +25,20 @@ public class ObjectCollectionFactory<T extends ObjectIdentifier> {
     private final FileIdentifierProvider<T> identifierFactory;
     private final int threads;
     private Exception exception = null; // fail in async
+    private final int minParallelProcessFileCountThreshold;
 
-    public ObjectCollectionFactory(FileIdentifierProvider<T> identifierFactory, int threads) {
+    public ObjectCollectionFactory(FileIdentifierProvider<T> identifierFactory, int threads, int minParallelProcessFileCountThreshold) {
         this.identifierFactory = identifierFactory;
         this.threads = threads;
+        this.minParallelProcessFileCountThreshold = minParallelProcessFileCountThreshold;
         if (threads <= 0)
             throw new IllegalArgumentException("thread count must be positive.");
+        if (minParallelProcessFileCountThreshold < 0)
+            throw new IllegalArgumentException("minParallelProcessFileCountThreshold must not be negative.");
     }
 
     public ObjectCollection fromDirectory(File directory, Set<String> ignoredFiles) throws IOException {
 
-        final int minParallelProcessFileCountThreshold = 0;
-
-        final Set<ObjectElement> subFiles = new ConcurrentSkipListSet<>();
-
         final Map<String, ObjectCollection> subCollections = new HashMap<>();
 
         if (!Objects.requireNonNull(directory).isDirectory())
@@ -61,6 +61,8 @@ public class ObjectCollectionFactory<T extends ObjectIdentifier> {
             }
         }
 
+        final Set<ObjectElement> subFiles = ConcurrentHashMap.newKeySet(files.size());
+
         // deal with all direct sub files
         if (threads == 1 || files.size() < minParallelProcessFileCountThreshold) {
             for (File file : files) {
@@ -90,7 +92,7 @@ public class ObjectCollectionFactory<T extends ObjectIdentifier> {
             }
         }
 
-        return new ObjectCollection(directory.getName(), new HashSet<>(subFiles), subCollections);
+        return new ObjectCollection(directory.getName(), subFiles, subCollections);
     }
 
     public ObjectCollection fromDirectory(File directory) throws IOException {
diff --git a/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectElement.java b/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectElement.java
index ee677fa..ff998f0 100644
--- a/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectElement.java
+++ b/src/main/java/com/keuin/kbackupfabric/backup/incremental/ObjectElement.java
@@ -1,7 +1,6 @@
 package com.keuin.kbackupfabric.backup.incremental;
 
 import com.keuin.kbackupfabric.backup.incremental.identifier.ObjectIdentifier;
-import org.jetbrains.annotations.NotNull;
 
 import java.io.Serializable;
 import java.util.Objects;
@@ -10,7 +9,7 @@ import java.util.Objects;
  * Representing a file in a ObjectCollection.
  * Immutable.
  */
-public class ObjectElement implements Serializable, Comparable<ObjectElement> {
+public class ObjectElement implements Serializable {
     private final String name;
     private final ObjectIdentifier identifier;
 
@@ -59,8 +58,4 @@ public class ObjectElement implements Serializable, Comparable<ObjectElement> {
                 '}';
     }
 
-    @Override
-    public int compareTo(@NotNull ObjectElement objectElement) {
-        return name.compareTo(objectElement.name);
-    }
 }