1 files changed, 64 insertions, 0 deletions
diff --git a/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java b/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java
new file mode 100644
index 0000000..ff7327c
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/utils/MappingUtils.java
@@ -0,0 +1,64 @@
+package ftbsc.lll.mapper.utils;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.utils.DescriptorBuilder;
+import org.objectweb.asm.Type;
+
+/**
+ * A collection of static utility methods correlated to
+ * mappers.
+ */
+public class MappingUtils {
+
+	/**
+	 * Maps a method descriptor, replacing its class references with their mapped counterparts.
+	 * @param descriptor a {@link String} containing the descriptor
+	 * @param mapper the {@link Mapper} to use for the process
+	 * @param reverse if true it uses the inverted mapper rather than the normal one
+	 * @return the mapped descriptor
+	 */
+	public static String mapMethodDescriptor(String descriptor, Mapper mapper, boolean reverse) {
+		Type method = Type.getMethodType(descriptor);
+		Type[] arguments = method.getArgumentTypes();
+		Type returnType = method.getReturnType();
+
+		Type[] mappedArguents = new Type[arguments.length];
+		for(int i = 0; i < mappedArguents.length; i++)
+			mappedArguents[i] = mapType(arguments[i], mapper, reverse);
+
+		return Type.getMethodDescriptor(mapType(returnType, mapper, reverse), mappedArguents);
+	}
+
+	/**
+	 * Given a {@link Type} and a valid {@link Mapper} it returns its mapped counterpart.
+	 * @param type the type in question
+	 * @param mapper the {@link Mapper} to use for the process
+	 * @param reverse if true it uses the inverted mapper rather than the normal one
+	 * @return the mapped type
+	 */
+	public static Type mapType(Type type, Mapper mapper, boolean reverse) {
+		//unwrap arrays
+		Type unwrapped = type;
+		int arrayLevel = 0;
+		while(unwrapped.getSort() == Type.ARRAY) {
+			unwrapped = unwrapped.getElementType();
+			arrayLevel++;
+		}
+
+		//if it's a primitive no operation is needed
+		if(type.getSort() < Type.ARRAY)
+			return type;
+
+		String internalName = type.getInternalName();
+
+		String internalNameMapped;
+		try {
+			internalNameMapped = reverse
+				? mapper.getInverted().getClassData(internalName).nameMapped
+				: mapper.getClassData(internalName).nameMapped;
+			return Type.getType(DescriptorBuilder.nameToDescriptor(internalNameMapped, arrayLevel));
+		} catch(MappingNotFoundException e) {
+			return type;
+		}
+	}
+}