Reformat and clean up "provider" package

src/main/java/provider/wz/WZDirectoryEntry.java

@@ -29,9 +29,9 @@ import provider.DataFileEntry;
 import java.util.*;
 
 public class WZDirectoryEntry extends WZEntry implements DataDirectoryEntry {
-    private List<DataDirectoryEntry> subdirs = new ArrayList<>();
-    private List<DataFileEntry> files = new ArrayList<>();
-    private Map<String, DataEntry> entries = new HashMap<>();
+    private final List<DataDirectoryEntry> subdirs = new ArrayList<>();
+    private final List<DataFileEntry> files = new ArrayList<>();
+    private final Map<String, DataEntry> entries = new HashMap<>();
 
     public WZDirectoryEntry(String name, int size, int checksum, DataEntity parent) {
         super(name, size, checksum, parent);

src/main/java/provider/wz/WZEntry.java

@@ -25,11 +25,11 @@ import provider.DataEntity;
 import provider.DataEntry;
 
 public class WZEntry implements DataEntry {
-    private String name;
-    private int size;
-    private int checksum;
+    private final String name;
+    private final int size;
+    private final int checksum;
     private int offset;
-    private DataEntity parent;
+    private final DataEntity parent;
 
     public WZEntry(String name, int size, int checksum, DataEntity parent) {
         super();

src/main/java/provider/wz/XMLDomMapleData.java

@@ -42,7 +42,7 @@ import java.util.Iterator;
 import java.util.List;
 
 public class XMLDomMapleData implements Data {
-	private Node node;
+    private final Node node;
     private File imageDataDir;
 
     public XMLDomMapleData(FileInputStream fis, File imageDataDir) {

src/main/java/provider/wz/XMLWZFile.java

@@ -31,8 +31,8 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 
 public class XMLWZFile implements DataProvider {
-    private File root;
-    private WZDirectoryEntry rootForNavigation;
+    private final File root;
+    private final WZDirectoryEntry rootForNavigation;
 
     public XMLWZFile(File fileIn) {
         root = fileIn;