Apply new conventions to lang package (SkriptLang#6918)

* Update lang package to new annotation conventions, new warning conventions, and use try-with-resources for loggers

* Apply suggestions from code review

Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>

* Requested changes

---------

Co-authored-by: Moderocky <admin@moderocky.com>
Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>

src/main/java/ch/njol/skript/classes/Changer.java

@@ -29,14 +29,13 @@
  * isn't overridden.
  * <p>
  * Some useful Changers can be found in {@link DefaultChangers}
- * 
- * @author Peter Güttinger
+ *
  * @see DefaultChangers
  * @see Expression
  */
 public interface Changer<T> {
 
-	public static enum ChangeMode {
+	enum ChangeMode {
 		ADD, SET, REMOVE, REMOVE_ALL, DELETE, RESET;
 	}
 
@@ -45,45 +44,44 @@ public static enum ChangeMode {
 	 * <p>
 	 * Unlike {@link Expression#acceptChange(ChangeMode)} this method must not print errors.
 	 * 
-	 * @param mode
+	 * @param mode The {@link ChangeMode} to test.
 	 * @return An array of types that {@link #change(Object[], Object[], ChangeMode)} accepts as its <code>delta</code> parameter (which can be arrays to denote that multiple of
 	 *         that type are accepted), or null if the given mode is not supported. For {@link ChangeMode#DELETE} and {@link ChangeMode#RESET} this can return any non-null array to
 	 *         mark them as supported.
 	 */
-	@Nullable
-	public abstract Class<?>[] acceptChange(ChangeMode mode);
+	Class<?> @Nullable [] acceptChange(ChangeMode mode);
 
 	/**
 	 * @param what The objects to change
 	 * @param delta An array with one or more instances of one or more of the the classes returned by {@link #acceptChange(ChangeMode)} for the given change mode (null for
 	 *            {@link ChangeMode#DELETE} and {@link ChangeMode#RESET}). <b>This can be a Object[], thus casting is not allowed.</b>
-	 * @param mode
+	 * @param mode The {@link ChangeMode} to test.
 	 * @throws UnsupportedOperationException (optional) if this method was called on an unsupported ChangeMode.
 	 */
-	public abstract void change(T[] what, @Nullable Object[] delta, ChangeMode mode);
+	void change(T[] what, Object @Nullable [] delta, ChangeMode mode);
 
-	public static abstract class ChangerUtils {
-		
-		@SuppressWarnings("unchecked")
-		public static <T, V> void change(final Changer<T> changer, final Object[] what, final @Nullable Object[] delta, final ChangeMode mode) {
+	abstract class ChangerUtils {
+
+		public static <T> void change(Changer<T> changer, Object[] what, Object @Nullable [] delta, ChangeMode mode) {
+			//noinspection unchecked
 			changer.change((T[]) what, delta, mode);
 		}
 
 		/**
 		 * Tests whether an expression accepts changes of a certain type. If multiple types are given it test for whether any of the types is accepted.
 		 * 
-		 * @param e The expression to test
+		 * @param expression The expression to test
 		 * @param mode The ChangeMode to use in the test
 		 * @param types The types to test for
-		 * @return Whether <tt>e.{@link Expression#change(Event, Object[], ChangeMode) change}(event, type[], mode)</tt> can be used or not.
+		 * @return Whether <tt>expression.{@link Expression#change(Event, Object[], ChangeMode) change}(event, type[], mode)</tt> can be used or not.
 		 */
-		public static boolean acceptsChange(final Expression<?> e, final ChangeMode mode, final Class<?>... types) {
-			final Class<?>[] cs = e.acceptChange(mode);
-			if (cs == null)
+		public static boolean acceptsChange(final Expression<?> expression, final ChangeMode mode, final Class<?>... types) {
+			final Class<?>[] validTypes = expression.acceptChange(mode);
+			if (validTypes == null)
 				return false;
 			for (final Class<?> type : types) {
-				for (final Class<?> c : cs) {
-					if (c.isArray() ? c.getComponentType().isAssignableFrom(type) : c.isAssignableFrom(type))
+				for (final Class<?> validType : validTypes) {
+					if (validType.isArray() ? validType.getComponentType().isAssignableFrom(type) : validType.isAssignableFrom(type))
 						return true;
 				}
 			}

src/main/java/ch/njol/skript/classes/data/DefaultFunctions.java

@@ -379,7 +379,7 @@ public World[] executeSimple(Object[][] params) {
 		}, DefaultClasses.LOCATION, true) {
 			@Override
 			@Nullable
-			public Location[] execute(FunctionEvent<?> e, Object[][] params) {
+			public Location[] execute(FunctionEvent<?> event, Object[][] params) {
 				for (int i : new int[] {0, 1, 2, 4, 5}) {
 					if (params[i] == null || params[i].length == 0 || params[i][0] == null)
 						return null;

src/main/java/ch/njol/skript/lang/Condition.java

@@ -22,7 +22,7 @@
 import ch.njol.skript.lang.util.SimpleExpression;
 import ch.njol.util.Checker;
 import org.bukkit.event.Event;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Iterator;
 
@@ -67,12 +67,11 @@ public final boolean isNegated() {
 		return negated;
 	}
 
-	@Nullable
-	@SuppressWarnings({"rawtypes", "unchecked"})
-	public static Condition parse(String input, @Nullable String defaultError) {
+	public static @Nullable Condition parse(String input, @Nullable String defaultError) {
 		input = input.trim();
 		while (input.startsWith("(") && SkriptParser.next(input, 0, ParseContext.DEFAULT) == input.length())
 			input = input.substring(1, input.length() - 1);
+		//noinspection unchecked,rawtypes
 		return (Condition) SkriptParser.parse(input, (Iterator) Skript.getConditions().iterator(), defaultError);
 	}
 

src/main/java/ch/njol/skript/lang/Debuggable.java

@@ -19,7 +19,7 @@
 package ch.njol.skript.lang;
 
 import org.bukkit.event.Event;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Represents an element that can print details involving an event.

src/main/java/ch/njol/skript/lang/Effect.java

@@ -23,7 +23,7 @@
 import ch.njol.skript.log.ParseLogHandler;
 import ch.njol.skript.log.SkriptLogger;
 import org.bukkit.event.Event;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Iterator;
 
@@ -50,11 +50,8 @@ public final boolean run(Event event) {
 		return true;
 	}
 
-	@Nullable
-	@SuppressWarnings({"rawtypes", "unchecked"})
-	public static Effect parse(String input, @Nullable String defaultError) {
-		ParseLogHandler log = SkriptLogger.startParseLogHandler();
-		try {
+	public static @Nullable Effect parse(String input, @Nullable String defaultError) {
+		try (ParseLogHandler log = SkriptLogger.startParseLogHandler()) {
 			EffFunctionCall functionCall = EffFunctionCall.parse(input);
 			if (functionCall != null) {
 				log.printLog();
@@ -72,6 +69,7 @@ public static Effect parse(String input, @Nullable String defaultError) {
 			}
 			log.clear();
 
+			//noinspection unchecked,rawtypes
 			Effect effect = (Effect) SkriptParser.parse(input, (Iterator) Skript.getEffects().iterator(), defaultError);
 			if (effect != null) {
 				log.printLog();
@@ -80,8 +78,6 @@ public static Effect parse(String input, @Nullable String defaultError) {
 
 			log.printError();
 			return null;
-		} finally {
-			log.stop();
 		}
 	}
 

src/main/java/ch/njol/skript/lang/EffectSection.java

@@ -23,7 +23,7 @@
 import ch.njol.skript.lang.SkriptParser.ParseResult;
 import ch.njol.skript.lang.parser.ParserInstance;
 import ch.njol.util.Kleenean;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Iterator;
 import java.util.List;
@@ -69,11 +69,10 @@ public abstract boolean init(Expression<?>[] expressions,
 	/**
 	 * Similar to {@link Section#parse(String, String, SectionNode, List)}, but will only attempt to parse from other {@link EffectSection}s.
 	 */
-	@Nullable
-	@SuppressWarnings({"unchecked", "rawtypes"})
-	public static EffectSection parse(String input, @Nullable String defaultError, @Nullable SectionNode sectionNode, @Nullable List<TriggerItem> triggerItems) {
+	public static @Nullable EffectSection parse(String input, @Nullable String defaultError, @Nullable SectionNode sectionNode, @Nullable List<TriggerItem> triggerItems) {
 		SectionContext sectionContext = ParserInstance.get().getData(SectionContext.class);
 
+		//noinspection unchecked,rawtypes
 		return sectionContext.modify(sectionNode, triggerItems, () ->
 			(EffectSection) SkriptParser.parse(
 				input,

src/main/java/ch/njol/skript/lang/EffectSectionEffect.java

@@ -21,7 +21,7 @@
 import ch.njol.skript.lang.SkriptParser.ParseResult;
 import ch.njol.util.Kleenean;
 import org.bukkit.event.Event;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Represents the Effect aspect of an EffectSection. This allows for the use of EffectSections as effects, rather than just sections.

src/main/java/ch/njol/skript/lang/Expression.java

@@ -31,8 +31,7 @@
 import ch.njol.util.Checker;
 import org.bukkit.event.Event;
 import org.bukkit.inventory.ItemStack;
-import org.eclipse.jdt.annotation.NonNull;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 import org.skriptlang.skript.lang.converter.Converter;
 
 import java.util.HashMap;
@@ -64,8 +63,7 @@ public interface Expression<T> extends SyntaxElement, Debuggable {
 	 * @return The value or null if this expression doesn't have any value for the event
 	 * @throws UnsupportedOperationException (optional) if this was called on a non-single expression
 	 */
-	@Nullable
-	T getSingle(Event event);
+	@Nullable T getSingle(Event event);
 
 	/**
 	 * Get an optional of the single value of this expression.
@@ -107,7 +105,7 @@ default Optional<T> getOptionalSingle(Event event) {
 	 * @param event The event
 	 * @return A non-null stream of this expression's non-null values
 	 */
-	default Stream<@NonNull ? extends  T> stream(Event event) {
+	default Stream<? extends  T> stream(Event event) {
 		Iterator<? extends T> iterator = iterator(event);
 		if (iterator == null) {
 			return Stream.empty();
@@ -178,9 +176,8 @@ default boolean canBeSingle() {
 	 * @see Converter
 	 * @see ConvertedExpression
 	 */
-	@Nullable
 	@SuppressWarnings("unchecked")
-	<R> Expression<? extends R> getConvertedExpression(Class<R>... to);
+	<R> @Nullable Expression<? extends R> getConvertedExpression(Class<R>... to);
 
 	/**
 	 * Gets the return type of this expression.
@@ -265,8 +262,7 @@ default boolean canReturn(Class<?> returnType) {
 	 * @param event The event to be used for evaluation
 	 * @return An iterator to iterate over all values of this expression which may be empty and/or null, but must not return null elements.
 	 */
-	@Nullable
-	Iterator<? extends T> iterator(Event event);
+	@Nullable Iterator<? extends T> iterator(Event event);
 
 	/**
 	 * Checks whether the given 'loop-...' expression should match this loop, e.g. loop-block matches any loops that loop through blocks and loop-argument matches an
@@ -316,8 +312,7 @@ default boolean canReturn(Class<?> returnType) {
 	 *         that type are accepted), or null if the given mode is not supported. For {@link ChangeMode#DELETE} and {@link ChangeMode#RESET} this can return any non-null array to
 	 *         mark them as supported.
 	 */
-	@Nullable
-	Class<?>[] acceptChange(ChangeMode mode);
+	Class<?> @Nullable [] acceptChange(ChangeMode mode);
 
 	/**
 	 * Tests all accepted change modes, and if so what type it expects the <code>delta</code> to be.
@@ -343,7 +338,7 @@ default Map<ChangeMode, Class<?>[]> getAcceptedChangeModes() {
 	 * @param mode The {@link ChangeMode} of the attempted change
 	 * @throws UnsupportedOperationException (optional) - If this method was called on an unsupported ChangeMode.
 	 */
-	void change(Event event, @Nullable Object[] delta, ChangeMode mode);
+	void change(Event event, Object @Nullable [] delta, ChangeMode mode);
 
 	/**
 	 * This method is called before this expression is set to another one.
@@ -356,8 +351,7 @@ default Map<ChangeMode, Class<?>[]> getAcceptedChangeModes() {
 	 * @param delta Initial delta array.
 	 * @return Delta array to use for change.
 	 */
-	@Nullable
-	default Object[] beforeChange(Expression<?> changed, @Nullable Object[] delta) {
+	default Object @Nullable [] beforeChange(Expression<?> changed, Object @Nullable [] delta) {
 		if (delta == null || delta.length == 0) // Nothing to nothing
 			return null;
 

src/main/java/ch/njol/skript/lang/ExpressionInfo.java

@@ -18,15 +18,14 @@
  */
 package ch.njol.skript.lang;
 
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Represents an expression's information, for use when creating new instances of expressions.
  */
 public class ExpressionInfo<E extends Expression<T>, T> extends SyntaxElementInfo<E> {
 
-	@Nullable
-	public ExpressionType expressionType;
+	public @Nullable ExpressionType expressionType;
 	public Class<T> returnType;
 
 	public ExpressionInfo(String[] patterns, Class<T> returnType, Class<E> expressionClass, String originClassPath) throws IllegalArgumentException {
@@ -51,8 +50,7 @@ public Class<T> getReturnType() {
 	 * Get the type of this expression.
 	 * @return The type of this Expression
 	 */
-	@Nullable
-	public ExpressionType getExpressionType() {
+	public @Nullable ExpressionType getExpressionType() {
 		return expressionType;
 	}
 

src/main/java/ch/njol/skript/lang/ExpressionList.java

@@ -27,7 +27,7 @@
 import ch.njol.util.Kleenean;
 import ch.njol.util.coll.CollectionUtils;
 import org.bukkit.event.Event;
-import org.eclipse.jdt.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import java.lang.reflect.Array;
 import java.util.ArrayList;
@@ -47,8 +47,7 @@ public class ExpressionList<T> implements Expression<T> {
 	protected boolean and;
 	private final boolean single;
 
-	@Nullable
-	private final ExpressionList<?> source;
+	private final @Nullable ExpressionList<?> source;
 
 	public ExpressionList(Expression<? extends T>[] expressions, Class<T> returnType, boolean and) {
 		this(expressions, returnType, and, null);
@@ -89,40 +88,38 @@ public boolean init(Expression<?>[] expressions, int matchedPattern, Kleenean is
 	}
 
 	@Override
-	@Nullable
-	public T getSingle(Event event) {
+	public @Nullable T getSingle(Event event) {
 		if (!single)
 			throw new UnsupportedOperationException();
 		Expression<? extends T> expression = CollectionUtils.getRandom(expressions);
 		return expression != null ? expression.getSingle(event) : null;
 	}
 
 	@Override
-	@SuppressWarnings("unchecked")
 	public T[] getArray(Event event) {
 		if (and)
 			return getAll(event);
 		Expression<? extends T> expression = CollectionUtils.getRandom(expressions);
+		//noinspection unchecked
 		return expression != null ? expression.getArray(event) : (T[]) Array.newInstance(returnType, 0);
 	}
 
 	@Override
-	@SuppressWarnings("unchecked")
 	public T[] getAll(Event event) {
 		List<T> values = new ArrayList<>();
 		for (Expression<? extends T> expr : expressions)
 			values.addAll(Arrays.asList(expr.getAll(event)));
+		//noinspection unchecked
 		return values.toArray((T[]) Array.newInstance(returnType, values.size()));
 	}
 
 	@Override
-	@Nullable
-	public Iterator<? extends T> iterator(Event event) {
+	public @Nullable Iterator<? extends T> iterator(Event event) {
 		if (!and) {
 			Expression<? extends T> expression = CollectionUtils.getRandom(expressions);
 			return expression != null ? expression.iterator(event) : null;
 		}
-		return new Iterator<T>() {
+		return new Iterator<>() {
 			private int i = 0;
 			@Nullable
 			private Iterator<? extends T> current = null;
@@ -178,9 +175,8 @@ public boolean check(Event event, Checker<? super T> checker) {
 	}
 
 	@Override
-	@Nullable
 	@SuppressWarnings("unchecked")
-	public <R> Expression<? extends R> getConvertedExpression(Class<R>... to) {
+	public <R> @Nullable Expression<? extends R> getConvertedExpression(Class<R>... to) {
 		Expression<? extends R>[] exprs = new Expression[expressions.length];
 		Class<?>[] returnTypes = new Class[expressions.length];
 		for (int i = 0; i < exprs.length; i++) {
@@ -215,8 +211,7 @@ public void invertAnd() {
 	}
 
 	@Override
-	@Nullable
-	public Class<?>[] acceptChange(ChangeMode mode) {
+	public Class<?> @Nullable [] acceptChange(ChangeMode mode) {
 		Class<?>[] exprClasses = expressions[0].acceptChange(mode);
 		if (exprClasses == null)
 			return null;
@@ -234,7 +229,7 @@ public Class<?>[] acceptChange(ChangeMode mode) {
 	}
 
 	@Override
-	public void change(Event event, @Nullable Object[] delta, ChangeMode mode) throws UnsupportedOperationException {
+	public void change(Event event, Object @Nullable [] delta, ChangeMode mode) throws UnsupportedOperationException {
 		for (Expression<?> expr : expressions) {
 			expr.change(event, delta, mode);
 		}