Add some helper functions, adjust visibility on variables

lib/nbt/Tag.dart

@@ -147,4 +147,84 @@ abstract class Tag {
         }
     }
   }
+
+  int asByte() {
+    if (this is ByteTag) {
+      return (this as ByteTag).value;
+    } else {
+      return 0;
+    }
+  }
+
+  List<int> asByteArray() {
+    if (this is ByteArrayTag) {
+      return (this as ByteArrayTag).value;
+    } else {
+      return [];
+    }
+  }
+
+  double asDouble() {
+    if (this is DoubleTag) {
+      return (this as DoubleTag).value;
+    } else {
+      return 0.0;
+    }
+  }
+
+  double asFloat() {
+    if (this is FloatTag) {
+      return (this as FloatTag).value;
+    } else {
+      return 0.0;
+    }
+  }
+
+  List<int> asIntArray() {
+    if (this is IntArrayTag) {
+      return (this as IntArrayTag).value;
+    } else {
+      return [];
+    }
+  }
+
+  int asInt() {
+    if (this is IntTag) {
+      return (this as IntTag).value;
+    } else {
+      return 0;
+    }
+  }
+
+  List<int> asLongArray() {
+    if (this is LongArrayTag) {
+      return (this as LongArrayTag).value;
+    } else {
+      return [];
+    }
+  }
+
+  int asLong() {
+    if (this is LongTag) {
+      return (this as LongTag).value;
+    } else {
+      return 0;
+    }
+  }
+
+  int asShort() {
+    if (this is ShortTag) {
+      return (this as ShortTag).value;
+    } else {
+      return 0;
+    }
+  }
+
+  String asString() {
+    if (this is StringTag) {
+      return (this as StringTag).value;
+    } else {
+      return "";
+    }
+  }
 }

lib/nbt/impl/ByteArrayTag.dart

@@ -2,12 +2,12 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class ByteArrayTag extends Tag {
-  final List<int> _value = [];
+  final List<int> value = [];
 
   ByteArrayTag();
 
   ByteArrayTag._(List<int> value) {
-    _value.addAll(value);
+    this.value.addAll(value);
   }
 
   static ByteArrayTag valueOf(List<int> value) {
@@ -18,14 +18,14 @@ class ByteArrayTag extends Tag {
   void readValue(ByteLayer data) {
     int len = data.readInt();
     for (int i = 0; i < len; i++) {
-      _value.add(data.readByte());
+      value.add(data.readByte());
     }
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeInt(_value.length);
-    for (int i in _value) {
+    data.writeInt(value.length);
+    for (int i in value) {
       data.writeByte(i);
     }
   }

lib/nbt/impl/ByteTag.dart

@@ -2,10 +2,10 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class ByteTag extends Tag {
-  int _value = 0;
+  int value = 0;
 
   ByteTag._(int value) {
-    _value = value;
+    this.value = value;
   }
 
   ByteTag();
@@ -16,12 +16,12 @@ class ByteTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readByte();
+    value = data.readByte();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeByte(_value);
+    data.writeByte(value);
   }
 
   @override

lib/nbt/impl/CompoundTag.dart

@@ -2,15 +2,13 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class CompoundTag extends Tag {
-  late final Map<String, Tag> _value;
+  late final Map<String, Tag> value = {};
 
-  CompoundTag() {
-    _value = <String, Tag>{};
-  }
+  CompoundTag();
 
   @override
   void readValue(ByteLayer data) {
-    _value.clear();
+    value.clear();
 
     while (true) {
       Tag tag = Tag.readNamedTag(data);
@@ -24,7 +22,7 @@ class CompoundTag extends Tag {
 
   @override
   void writeValue(ByteLayer data) {
-    Iterator<Tag> it = _value.values.iterator;
+    Iterator<Tag> it = value.values.iterator;
 
     while (it.moveNext()) {
       Tag tag = it.current;
@@ -35,16 +33,16 @@ class CompoundTag extends Tag {
   }
 
   void put(String name, Tag tag) {
-    _value[name] = tag;
+    value[name] = tag;
   }
 
   bool contains(String name) {
-    return _value.containsKey(name);
+    return value.containsKey(name);
   }
 
   Tag? get(String name) {
     if (contains(name)) {
-      return _value[name] as Tag;
+      return value[name] as Tag;
     } else {
       // Does not exist!
       return null;
@@ -52,7 +50,7 @@ class CompoundTag extends Tag {
   }
 
   void remove(String name) {
-    _value.remove(name);
+    value.remove(name);
   }
 
   @override

lib/nbt/impl/DoubleTag.dart

@@ -2,12 +2,12 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class DoubleTag extends Tag {
-  double _value = 0.0;
+  double value = 0.0;
 
   DoubleTag();
 
   DoubleTag._(double value) {
-    _value = value;
+    this.value = value;
   }
 
   static DoubleTag valueOf(double value) {
@@ -16,12 +16,12 @@ class DoubleTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readDouble();
+    value = data.readDouble();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeDouble(_value);
+    data.writeDouble(value);
   }
 
   @override

lib/nbt/impl/FloatTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class FloatTag extends Tag {
-  double _value = 0.0;
+  double value = 0.0;
   FloatTag();
 
   FloatTag._(double value) {
-    _value = value;
+    this.value = value;
   }
 
   static FloatTag valueOf(double value) {
@@ -15,12 +15,12 @@ class FloatTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readFloat();
+    value = data.readFloat();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeFloat(_value);
+    data.writeFloat(value);
   }
 
   @override

lib/nbt/impl/IntArrayTag.dart

@@ -2,25 +2,25 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class IntArrayTag extends Tag {
-  final List<int> _value = [];
+  final List<int> value = [];
   IntArrayTag();
 
   IntArrayTag._(List<int> value) {
-    _value.addAll(value);
+    this.value.addAll(value);
   }
 
   @override
   void readValue(ByteLayer data) {
     int count = data.readInt();
     for (int i = 0; i < count; i++) {
-      _value.add(data.readInt());
+      value.add(data.readInt());
     }
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeInt(_value.length);
-    for (int i in _value) {
+    data.writeInt(value.length);
+    for (int i in value) {
       data.writeInt(i);
     }
   }

lib/nbt/impl/IntTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class IntTag extends Tag {
-  int _value = 0;
+  int value = 0;
   IntTag();
 
   IntTag._(int value) {
-    _value = value;
+    this.value = value;
   }
 
   static IntTag valueOf(int value) {
@@ -15,12 +15,12 @@ class IntTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readInt();
+    value = data.readInt();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeInt(_value);
+    data.writeInt(value);
   }
 
   @override

lib/nbt/impl/ListTag.dart

@@ -2,11 +2,9 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class ListTag extends Tag {
-  List<Tag> _value = [];
+  List<Tag> value = [];
 
-  ListTag() {
-    _value = List.empty(growable: true);
-  }
+  ListTag();
 
   @override
   void readValue(ByteLayer data) {
@@ -24,36 +22,36 @@ class ListTag extends Tag {
   void writeValue(ByteLayer data) {
     TagType type = TagType.End;
     if (size() > 0) {
-      type = _value[0].getTagType();
+      type = value[0].getTagType();
     }
 
     data.writeByte(type.byte);
     data.writeInt(size());
     for (int i = 0; i < size(); i++) {
-      _value[i].writeValue(data);
+      value[i].writeValue(data);
     }
   }
 
   void add(Tag tag) {
     TagType type = TagType.End;
     if (size() > 0) {
-      type = _value[0].getTagType();
+      type = value[0].getTagType();
     }
     if (type == TagType.End || type == tag.getTagType()) {
-      _value.add(tag);
+      value.add(tag);
     }
   }
 
   void remove(Tag tag) {
-    _value.remove(tag);
+    value.remove(tag);
   }
 
   void removeAt(int index) {
-    _value.removeAt(index);
+    value.removeAt(index);
   }
 
   int indexOf(Tag tag) {
-    return _value.indexOf(tag);
+    return value.indexOf(tag);
   }
 
   @override
@@ -62,6 +60,6 @@ class ListTag extends Tag {
   }
 
   int size() {
-    return _value.length;
+    return value.length;
   }
 }

lib/nbt/impl/LongArrayTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class LongArrayTag extends Tag {
-  final List<int> _value = [];
+  final List<int> value = [];
   LongArrayTag();
 
   LongArrayTag._(List<int> lst) {
-    _value.addAll(lst);
+    value.addAll(lst);
   }
 
   static LongArrayTag valueOf(List<int> value) {
@@ -17,20 +17,20 @@ class LongArrayTag extends Tag {
   void readValue(ByteLayer data) {
     int count = data.readInt();
     for (int i = 0; i < count; i++) {
-      _value.add(data.readLong());
+      value.add(data.readLong());
     }
   }
 
   @override
   void writeValue(ByteLayer data) {
     data.writeInt(size());
-    for (int i in _value) {
+    for (int i in value) {
       data.writeLong(i);
     }
   }
 
   int size() {
-    return _value.length;
+    return value.length;
   }
 
   @override

lib/nbt/impl/LongTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class LongTag extends Tag {
-  int _value = 0;
+  int value = 0;
   LongTag();
 
   LongTag._(int value) {
-    _value = value;
+    this.value = value;
   }
 
   static LongTag valueOf(int value) {
@@ -15,12 +15,12 @@ class LongTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readLong();
+    value = data.readLong();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeLong(_value);
+    data.writeLong(value);
   }
 
   @override

lib/nbt/impl/ShortTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class ShortTag extends Tag {
-  int _value = 0;
+  int value = 0;
   ShortTag();
 
   ShortTag._(int value) {
-    _value = value;
+    this.value = value;
   }
 
   static ShortTag valueOf(int value) {
@@ -15,12 +15,12 @@ class ShortTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readShort();
+    value = data.readShort();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeShort(_value);
+    data.writeShort(value);
   }
 
   @override

lib/nbt/impl/StringTag.dart

@@ -2,11 +2,11 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class StringTag extends Tag {
-  String _value = "";
+  String value = "";
   StringTag();
 
   StringTag._(String str) {
-    _value = str;
+    value = str;
   }
 
   static StringTag valueOf(String str) {
@@ -15,12 +15,12 @@ class StringTag extends Tag {
 
   @override
   void readValue(ByteLayer data) {
-    _value = data.readString();
+    value = data.readString();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    data.writeString(_value);
+    data.writeString(value);
   }
 
   @override