chore: big code refactoring

build.gradle

@@ -12,5 +12,5 @@ repositories {
  //TODO: figure out how to make annotationProcessor inherit its dependencies
 dependencies {
     implementation 'com.squareup:javapoet:1.13.0'
-    implementation 'ftbsc:lll:0.2.1'
+    implementation 'ftbsc:lll:0.2.2'
 }

src/main/java/ftbsc/lll/processor/ASTUtils.java

@@ -0,0 +1,88 @@
+package ftbsc.lll.processor;
+
+import com.squareup.javapoet.ArrayTypeName;
+import com.squareup.javapoet.ClassName;
+import com.squareup.javapoet.MethodSpec;
+import com.squareup.javapoet.TypeName;
+import ftbsc.lll.tools.DescriptorBuilder;
+
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.type.TypeMirror;
+import java.lang.annotation.Annotation;
+
+/**
+ * Collection of static utils that didn't really fit into the main class.
+ */
+public class ASTUtils {
+	/**
+	 * Finds, among the methods of a class cl, the one annotated with ann, and tries to build
+	 * a {@link ExecutableElement} from it.
+	 * In case of multiple occurrences, only the first one is returned.
+	 * No check existance check is performed within the method.
+	 * @param cl the {@link ExecutableElement} for the class containing the desired method
+	 * @param ann the {@link Class} corresponding to the desired annotation
+	 * @return the {@link MethodSpec} representing the desired method
+	 */
+	@SuppressWarnings("OptionalGetWithoutIsPresent")
+	public static ExecutableElement findAnnotatedMethod(TypeElement cl, Class<? extends Annotation> ann) {
+		return (ExecutableElement) cl.getEnclosedElements()
+			.stream()
+			.filter(e -> e.getAnnotation(ann) != null)
+			.findFirst()
+			.get(); //will never be null so can ignore warning
+	}
+
+	/**
+	 * Builds a type descriptor from the given {@link TypeMirror}
+	 * @param t the {@link TypeMirror} representing the desired type
+	 * @return a {@link String} containing the relevant descriptor
+	 */
+	public static String descriptorFromType(TypeMirror t) {
+		TypeName type = TypeName.get(t);
+		StringBuilder desc = new StringBuilder();
+		//add array brackets
+		while(type instanceof ArrayTypeName) {
+			desc.append("[");
+			type = ((ArrayTypeName) type).componentType;
+		}
+		if(type instanceof ClassName) {
+			ClassName var = (ClassName) type;
+			desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
+		} else {
+			if(TypeName.BOOLEAN.equals(type))
+				desc.append("Z");
+			else if(TypeName.CHAR.equals(type))
+				desc.append("C");
+			else if(TypeName.BYTE.equals(type))
+				desc.append("B");
+			else if(TypeName.SHORT.equals(type))
+				desc.append("S");
+			else if(TypeName.INT.equals(type))
+				desc.append("I");
+			else if(TypeName.FLOAT.equals(type))
+				desc.append("F");
+			else if(TypeName.LONG.equals(type))
+				desc.append("J");
+			else if(TypeName.DOUBLE.equals(type))
+				desc.append("D");
+			else if(TypeName.VOID.equals(type))
+				desc.append("V");
+		}
+		return desc.toString();
+	}
+
+	/**
+	 * Builds a method descriptor from the given {@link ExecutableElement}.
+	 * @param m the {@link ExecutableElement} for the method
+	 * @return a {@link String} containing the relevant descriptor
+	 */
+	public static String descriptorFromMethodSpec(ExecutableElement m) {
+		StringBuilder methodSignature = new StringBuilder();
+		methodSignature.append("(");
+		m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
+		methodSignature.append(")");
+		methodSignature.append(descriptorFromType(m.getReturnType()));
+		return methodSignature.toString();
+	}
+}

src/main/java/ftbsc/lll/processor/LilleroProcessor.java

@@ -5,8 +5,6 @@ import ftbsc.lll.IInjector;
 import ftbsc.lll.processor.annotations.Injector;
 import ftbsc.lll.processor.annotations.Patch;
 import ftbsc.lll.processor.annotations.Target;
-import ftbsc.lll.processor.exceptions.MappingNotFoundException;
-import ftbsc.lll.processor.exceptions.MappingsFileNotFoundException;
 import ftbsc.lll.tools.DescriptorBuilder;
 import ftbsc.lll.tools.SrgMapper;
 
@@ -29,6 +27,9 @@ import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import static ftbsc.lll.processor.ASTUtils.descriptorFromMethodSpec;
+import static ftbsc.lll.processor.ASTUtils.findAnnotatedMethod;
+
 /**
  * The actual annotation processor behind the magic.
  * It (implicitly) implements the {@link Processor} interface by extending {@link AbstractProcessor}.
@@ -102,91 +103,6 @@ public class LilleroProcessor extends AbstractProcessor {
 		}
 	}
 
-	/**
-	 * Finds, among the methods of a class cl, the one annotated with ann, and tries to build
-	 * a {@link MethodSpec} from it.
-	 * In case of multiple occurrences, only the first one is returned.
-	 * No check existance check is performed within the method.
-	 * @param cl the {@link TypeElement} for the class containing the desired method
-	 * @param ann the {@link Class} corresponding to the desired annotation
-	 * @return the {@link MethodSpec} representing the desired method
-	 */
-	@SuppressWarnings("OptionalGetWithoutIsPresent")
-	private static ExecutableElement findAnnotatedMethod(TypeElement cl, Class<? extends Annotation> ann) {
-		return (ExecutableElement) cl.getEnclosedElements()
-			.stream()
-			.filter(e -> e.getAnnotation(ann) != null)
-			.findFirst()
-			.get(); //will never be null so can ignore warning
-	}
-
-	/**
-	 * Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
-	 * @param name the name of the method
-	 * @param returnString the {@link String} to return
-	 * @return the built {@link MethodSpec}
-	 */
-	private static MethodSpec buildStringReturnMethod(String name, String returnString) {
-		return MethodSpec.methodBuilder(name)
-			.addModifiers(Modifier.PUBLIC)
-			.returns(String.class)
-			.addStatement("return $S", returnString)
-			.build();
-	}
-
-	/**
-	 * Builds a type descriptor from the given {@link TypeMirror}
-	 * @param t the {@link TypeMirror} representing the desired type
-	 * @return a {@link String} containing the relevant descriptor
-	 */
-	public static String descriptorFromType(TypeMirror t) {
-		TypeName type = TypeName.get(t);
-		StringBuilder desc = new StringBuilder();
-		//add array brackets
-		while(type instanceof ArrayTypeName) {
-			desc.append("[");
-			type = ((ArrayTypeName) type).componentType;
-		}
-		if(type instanceof ClassName) {
-			ClassName var = (ClassName) type;
-			desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
-		} else {
-			if(TypeName.BOOLEAN.equals(type))
-				desc.append("Z");
-			else if(TypeName.CHAR.equals(type))
-				desc.append("C");
-			else if(TypeName.BYTE.equals(type))
-				desc.append("B");
-			else if(TypeName.SHORT.equals(type))
-				desc.append("S");
-			else if(TypeName.INT.equals(type))
-				desc.append("I");
-			else if(TypeName.FLOAT.equals(type))
-				desc.append("F");
-			else if(TypeName.LONG.equals(type))
-				desc.append("J");
-			else if(TypeName.DOUBLE.equals(type))
-				desc.append("D");
-			else if(TypeName.VOID.equals(type))
-				desc.append("V");
-		}
-		return desc.toString();
-	}
-
-	/**
-	 * Builds a method descriptor from the given {@link ExecutableElement}.
-	 * @param m the {@link ExecutableElement} for the method
-	 * @return a {@link String} containing the relevant descriptor
-	 */
-	public static String descriptorFromMethodSpec(ExecutableElement m) {
-		StringBuilder methodSignature = new StringBuilder();
-		methodSignature.append("(");
-		m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
-		methodSignature.append(")");
-		methodSignature.append(descriptorFromType(m.getReturnType()));
-		return methodSignature.toString();
-	}
-
 	/**
 	 * Generates the Injector corresponding to the given class.
 	 * Basically implements the {@link IInjector} interface for you.
@@ -201,7 +117,7 @@ public class LilleroProcessor extends AbstractProcessor {
 				StandardCharsets.UTF_8)).lines());
 			is.close();
 		} catch(IOException e) {
-			throw new MappingsFileNotFoundException();
+			throw new RuntimeException("Could not open the specified TSRG file!", e);
 		}
 
 		Patch ann = cl.getAnnotation(Patch.class);
@@ -212,8 +128,6 @@ public class LilleroProcessor extends AbstractProcessor {
 			targetClassCanonicalName = e.getTypeMirror().toString();
 		} //pretty sure class names de facto never change but better safe than sorry
 		String targetClassSrgName = mapper.getMcpClass(targetClassCanonicalName.replace('.', '/'));
-		if(targetClassSrgName == null)
-			throw new MappingNotFoundException(targetClassCanonicalName);
 
 		ExecutableElement targetMethod = findAnnotatedMethod(cl, Target.class);
 		String targetMethodDescriptor = descriptorFromMethodSpec(targetMethod);
@@ -222,9 +136,6 @@ public class LilleroProcessor extends AbstractProcessor {
 			targetMethod.getSimpleName() + " " + targetMethodDescriptor
 		);
 
-		if(targetMethodSrgName == null)
-			throw new MappingNotFoundException(targetMethod.getSimpleName() + " " + targetMethodDescriptor);
-
 		ExecutableElement injectorMethod = findAnnotatedMethod(cl, Injector.class);
 
 		Element packageElement = cl.getEnclosingElement();
@@ -274,6 +185,20 @@ public class LilleroProcessor extends AbstractProcessor {
 		this.generatedInjectors.add(injectorClassName);
 	}
 
+	/**
+	 * Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
+	 * @param name the name of the method
+	 * @param returnString the {@link String} to return
+	 * @return the built {@link MethodSpec}
+	 */
+	private static MethodSpec buildStringReturnMethod(String name, String returnString) {
+		return MethodSpec.methodBuilder(name)
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addStatement("return $S", returnString)
+			.build();
+	}
+
 	/**
 	 * Generates the Service Provider file for the generated injectors.
 	 */

src/main/java/ftbsc/lll/processor/exceptions/MappingNotFoundException.java

@@ -1,7 +0,0 @@
-package ftbsc.lll.processor.exceptions;
-
-public class MappingNotFoundException extends RuntimeException {
-	public MappingNotFoundException(String mapping) {
-		super("Could not find mapping for " + mapping + "!");
-	}
-}

src/main/java/ftbsc/lll/processor/exceptions/MappingsFileNotFoundException.java

@@ -1,10 +0,0 @@
-package ftbsc.lll.processor.exceptions;
-
-/**
- * Thrown upon failure to locate the output.tsrg file at runtime.
- */
-public class MappingsFileNotFoundException extends RuntimeException {
-	public MappingsFileNotFoundException() {
-		super("Could not find a mappings file in the specified location!");
-	}
-}