add nbt utils (experimental)

nmsutils-core/src/main/java/de/cubeside/nmsutils/NMSUtils.java

@@ -1,5 +1,6 @@
 package de.cubeside.nmsutils;
 
+import de.cubeside.nmsutils.nbt.NbtUtils;
 import org.bukkit.Bukkit;
 import org.bukkit.Server;
 import org.bukkit.plugin.Plugin;
@@ -35,6 +36,15 @@ public default BiomeUtils getBiomeUtils() {
         throw new UnsupportedOperationException();
     }
 
+    /**
+     * Gets an instance of NbtUtils for manipulating nbt.
+     *
+     * @return the NbtUtils
+     */
+    public default NbtUtils getNbtUtils() {
+        throw new UnsupportedOperationException();
+    }
+
     /**
      * Gets an instance of MiscUtils for various features.
      *

nmsutils-core/src/main/java/de/cubeside/nmsutils/nbt/ByteArrayTag.java

@@ -0,0 +1,37 @@
+package de.cubeside.nmsutils.nbt;
+
+import com.google.common.base.Preconditions;
+import java.util.Arrays;
+
+public final class ByteArrayTag extends Tag {
+    private byte[] value;
+
+    public ByteArrayTag(byte[] value) {
+        Preconditions.checkNotNull(value);
+        this.value = value;
+    }
+
+    public byte[] getValue() {
+        return value;
+    }
+
+    public void setValue(byte[] value) {
+        Preconditions.checkNotNull(value);
+        this.value = value;
+    }
+
+    @Override
+    public TagType getType() {
+        return TagType.BYTE_ARRAY;
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(this.value);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof ByteArrayTag o && Arrays.equals(value, o.value);
+    }
+}

nmsutils-core/src/main/java/de/cubeside/nmsutils/nbt/ByteTag.java

@@ -0,0 +1,47 @@
+package de.cubeside.nmsutils.nbt;
+
+public final class ByteTag extends Tag implements NumericTag {
+    private byte value;
+
+    public ByteTag(byte value) {
+        this.value = value;
+    }
+
+    public byte getValue() {
+        return value;
+    }
+
+    public void setValue(byte value) {
+        this.value = value;
+    }
+
+    @Override
+    public int getValueAsInt() {
+        return value;
+    }
+
+    @Override
+    public long getValueAsLong() {
+        return value;
+    }
+
+    @Override
+    public double getValueAsDouble() {
+        return value;
+    }
+
+    @Override
+    public TagType getType() {
+        return TagType.BYTE;
+    }
+
+    @Override
+    public int hashCode() {
+        return this.value;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof ByteTag o && value == o.value;
+    }
+}