NbtCompound can now accepts arbitrary primitive, list or map objects.

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/nbt/MemoryElement.java

@@ -0,0 +1,65 @@
+package com.comphenix.protocol.wrappers.nbt;
+
+class MemoryElement<TType> implements NbtBase<TType> {
+	private String name;
+	private TType value;
+	private NbtType type;
+	
+	public MemoryElement(String name, TType value) {
+		if (name == null)
+			throw new IllegalArgumentException("Name cannot be NULL.");
+		if (value == null)
+			throw new IllegalArgumentException("Element cannot be NULL.");
+		
+		this.name = name;
+		this.value = value;
+		this.type = NbtType.getTypeFromClass(value.getClass());
+	}
+	
+	public MemoryElement(String name, TType value, NbtType type) {
+		if (name == null)
+			throw new IllegalArgumentException("Name cannot be NULL.");
+		if (type == null)
+			throw new IllegalArgumentException("Type cannot be NULL.");
+		
+		this.name = name;
+		this.value = value;
+		this.type = type;
+	}
+
+	@Override
+	public boolean accept(NbtVisitor visitor) {
+		return visitor.visit(this);
+	}
+
+	@Override
+	public NbtType getType() {
+		return type;
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	@Override
+	public TType getValue() {
+		return value;
+	}
+
+	@Override
+	public void setValue(TType newValue) {
+		this.value = newValue;
+	}
+
+	@Override
+	public NbtBase<TType> deepClone() {
+		// This assumes value is an immutable object
+		return new MemoryElement<TType>(name, value, type);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/nbt/NbtCompound.java

@@ -5,6 +5,8 @@ import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
 
+import javax.annotation.Nonnull;
+
 /**
  * Represents a mapping of arbitrary NBT elements and their unique names.
  * <p>
@@ -52,8 +54,9 @@ public interface NbtCompound extends NbtBase<Map<String, NbtBase<?>>>, Iterable<
 	 * Set a entry based on its name.
 	 * @param entry - entry with a name and value.
 	 * @return This compound, for chaining.
+	 * @throws IllegalArgumentException If entry is NULL.
 	 */
-	public abstract <T> NbtCompound put(NbtBase<T> entry);
+	public abstract <T> NbtCompound put(@Nonnull NbtBase<T> entry);
 
 	/**
 	 * Retrieve the string value of an entry identified by a given key.
@@ -256,6 +259,17 @@ public interface NbtCompound extends NbtBase<Map<String, NbtBase<?>>>, Iterable<
 	 */
 	public abstract NbtCompound put(String key, int[] value);
 	
+	/**
+	 * Associates a given Java primitive value, list, map or NbtBase<?> with a certain key.
+	 * <p>
+	 * If the value is NULL, the corresponding key is removed.
+	 * 
+	 * @param key - the name of the new entry,
+	 * @param value - the value of the new entry, or NULL to remove the current value.
+	 * @return This current compound, for chaining.
+	 */
+	public abstract NbtCompound putObject(String key, Object value);
+	
 	/**
 	 * Retrieve the compound (map) value of an entry identified by a given key.
 	 * @param key - the key of the entry.

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/nbt/WrappedCompound.java

@@ -152,7 +152,13 @@ class WrappedCompound implements NbtWrapper<Map<String, NbtBase<?>>>, Iterable<N
 	public void setValue(Map<String, NbtBase<?>> newValue) {
 		// Write all the entries
 		for (Map.Entry<String, NbtBase<?>> entry : newValue.entrySet()) {
-			put(entry.getValue());
+			Object value = entry.getValue();
+			
+			// We don't really know
+			if (value instanceof NbtBase)
+				put(entry.getValue());
+			else
+				putObject(entry.getKey(), entry.getValue());
 		}
 	}
 	
@@ -255,6 +261,19 @@ class WrappedCompound implements NbtWrapper<Map<String, NbtBase<?>>>, Iterable<N
 		return this;
 	}
 	
+	@Override
+	public NbtCompound putObject(String key, Object value) {
+		if (value == null) {
+			remove(key);
+		} else if (value instanceof NbtBase) {
+			put(key, (NbtBase<?>) value);
+		} else {
+			NbtBase<?> base = new MemoryElement<Object>(key, value);
+			put(base);
+		}
+		return this;
+	}
+	
 	/**
 	 * Retrieve the byte value of an entry identified by a given key.
 	 * @param key - the key of the entry.