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Command framework and dispatcher for the JVM
//
// MIT License
//
// Copyright (c) 2021 Alexander Söderberg & Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
package cloud.commandframework.bukkit.internal;
import com.google.common.annotations.Beta;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.bukkit.Bukkit;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Utilities for doing reflection on CraftBukkit, used by the cloud implementation.
*
* This is not API to any extent, and as such, may break, change, or be removed without any notice.
*/
@Beta
@SuppressWarnings("EmptyCatch")
public final class CraftBukkitReflection {
private static final String PREFIX_NMS = "net.minecraft.server";
private static final String PREFIX_MC = "net.minecraft.";
private static final String PREFIX_CRAFTBUKKIT = "org.bukkit.craftbukkit";
private static final String CRAFT_SERVER = "CraftServer";
private static final String CB_PKG_VERSION;
public static final int MAJOR_REVISION;
static {
final Class serverClass = Bukkit.getServer().getClass();
final String pkg = serverClass.getPackage().getName();
final String nmsVersion = pkg.substring(pkg.lastIndexOf(".") + 1);
if (!nmsVersion.contains("_")) {
int fallbackVersion = -1;
try {
final Method getMinecraftVersion = serverClass.getDeclaredMethod("getMinecraftVersion");
fallbackVersion = Integer.parseInt(getMinecraftVersion.invoke(Bukkit.getServer()).toString().split("\\.")[1]);
} catch (final Exception ignored) {
}
MAJOR_REVISION = fallbackVersion;
} else {
MAJOR_REVISION = Integer.parseInt(nmsVersion.split("_")[1]);
}
String name = serverClass.getName();
name = name.substring(PREFIX_CRAFTBUKKIT.length());
name = name.substring(0, name.length() - CRAFT_SERVER.length());
CB_PKG_VERSION = name;
}
@SafeVarargs
public static @Nullable T firstNonNullOrNull(
final @Nullable T @NonNull... elements
) {
for (final T element : elements) {
if (element != null) {
return element;
}
}
return null;
}
@SafeVarargs
@SuppressWarnings("varargs")
public static @NonNull T firstNonNullOrThrow(
final @NonNull Supplier<@NonNull String> errorMessage,
final @Nullable T @NonNull... elements
) {
final @Nullable T t = firstNonNullOrNull(elements);
if (t == null) {
throw new IllegalArgumentException(errorMessage.get());
}
return t;
}
public static @NonNull Class needNMSClassOrElse(
final @NonNull String nms,
final @NonNull String... classNames
) throws RuntimeException {
final Class nmsClass = findNMSClass(nms);
if (nmsClass != null) {
return nmsClass;
}
return firstNonNullOrThrow(
() -> String.format(
"Cound't find the NMS class '%s', or any of the following fallbacks: %s",
nms,
Arrays.toString(classNames)
),
Arrays.stream(classNames)
.map(CraftBukkitReflection::findClass)
.toArray(Class[]::new)
);
}
public static @NonNull Class needMCClass(final @NonNull String name) throws RuntimeException {
return needClass(PREFIX_MC + name);
}
public static @NonNull Class needNMSClass(final @NonNull String className) throws RuntimeException {
return needClass(PREFIX_NMS + CB_PKG_VERSION + className);
}
public static @NonNull Class needOBCClass(final @NonNull String className) throws RuntimeException {
return needClass(PREFIX_CRAFTBUKKIT + CB_PKG_VERSION + className);
}
public static @Nullable Class findMCClass(final @NonNull String name) throws RuntimeException {
return findClass(PREFIX_MC + name);
}
public static @Nullable Class findNMSClass(final @NonNull String className) throws RuntimeException {
return findClass(PREFIX_NMS + CB_PKG_VERSION + className);
}
public static @Nullable Class findOBCClass(final @NonNull String className) throws RuntimeException {
return findClass(PREFIX_CRAFTBUKKIT + CB_PKG_VERSION + className);
}
public static @NonNull Class needClass(final @NonNull String className) throws RuntimeException {
try {
return Class.forName(className);
} catch (final ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
public static @Nullable Class findClass(final @NonNull String className) {
try {
return Class.forName(className);
} catch (final ClassNotFoundException e) {
return null;
}
}
public static @NonNull Field needField(final @NonNull Class holder, final @NonNull String name) throws RuntimeException {
try {
final Field field = holder.getDeclaredField(name);
field.setAccessible(true);
return field;
} catch (final ReflectiveOperationException e) {
throw new RuntimeException(e);
}
}
public static @Nullable Field findField(final @NonNull Class holder, final @NonNull String name) throws RuntimeException {
try {
return needField(holder, name);
} catch (final RuntimeException e) {
return null;
}
}
public static @NonNull Constructor needConstructor(final @NonNull Class holder, final @NonNull Class... parameters) {
try {
return holder.getDeclaredConstructor(parameters);
} catch (final NoSuchMethodException ex) {
throw new RuntimeException(ex);
}
}
public static boolean classExists(final @NonNull String className) {
return findClass(className) != null;
}
public static @Nullable Method findMethod(
final @NonNull Class holder,
final @NonNull String name,
final @NonNull Class... params
) throws RuntimeException {
try {
return holder.getMethod(name, params);
} catch (final NoSuchMethodException e) {
return null;
}
}
public static @NonNull Method needMethod(
final @NonNull Class holder,
final @NonNull String name,
final @NonNull Class... params
) throws RuntimeException {
try {
return holder.getMethod(name, params);
} catch (final NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
public static Stream streamMethods(final @NonNull Class clazz) {
return Arrays.stream(clazz.getDeclaredMethods());
}
private CraftBukkitReflection() {
}
}