minecraft-kajetans-mod/src/main/java/me/km/utils/ReflectionUtils.java

package me.km.utils;

import cpw.mods.modlauncher.api.INameMappingService;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Set;
import net.minecraft.block.Block;
import net.minecraft.block.Blocks;
import net.minecraft.block.FireBlock;
import net.minecraft.command.Commands;
import net.minecraft.entity.ai.goal.GoalSelector;
import net.minecraft.entity.ai.goal.PrioritizedGoal;
import net.minecraft.entity.player.PlayerAbilities;
import net.minecraft.entity.player.ServerPlayerEntity;
import net.minecraft.resources.DataPackRegistries;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.management.PlayerInteractionManager;
import net.minecraft.server.management.PlayerList;
import net.minecraft.util.FoodStats;
import net.minecraft.world.Explosion;
import net.minecraft.world.GameRules;
import net.minecraft.world.GameType;
import net.minecraft.world.IWorld;
import net.minecraft.world.server.ServerWorld;
import net.minecraftforge.fml.common.ObfuscationReflectionHelper;
import static net.minecraftforge.fml.common.ObfuscationReflectionHelper.remapName;
import org.apache.logging.log4j.LogManager;

public class ReflectionUtils {
    // -----------------------------------------------------------------------------------
    // helper stuff
    // -----------------------------------------------------------------------------------

    public static Method getMethod(Class c, String name, Class... pars) {
        try {
            return ObfuscationReflectionHelper.findMethod(c, name, pars);
        } catch(Exception ex) {
            LogManager.getLogger().warn(name + " - " + ex);
        }
        return null;
    }

    public static Field getField(Class c, String field) {
        try {
            Field f = c.getDeclaredField(remapName(INameMappingService.Domain.FIELD, field));
            f.setAccessible(true);
            return f;
        } catch(Exception ex) {
            LogManager.getLogger().warn(field + " - " + ex);
        }
        return null;
    }

    private static <T> void setInt(T t, Field f, int i) {
        try {
            f.setInt(t, i);
        } catch(SecurityException | IllegalArgumentException | IllegalAccessException | NullPointerException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
        }
    }

    private static <T> int getInt(T t, Field f, int error) {
        try {
            return f.getInt(t);
        } catch(SecurityException | IllegalArgumentException | IllegalAccessException | NullPointerException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
            return error;
        }
    }

    private static <T> void setFloat(T t, Field f, float fl) {
        try {
            f.setFloat(t, fl);
        } catch(SecurityException | IllegalArgumentException | IllegalAccessException | NullPointerException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
        }
    }

    private static <T> float getFloat(T t, Field f, float error) {
        try {
            return f.getFloat(t);
        } catch(SecurityException | IllegalArgumentException | IllegalAccessException | NullPointerException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
            return error;
        }
    }

    private static <T> boolean getBoolean(T t, Field f, boolean error) {
        try {
            return f.getBoolean(t);
        } catch(SecurityException | IllegalArgumentException | IllegalAccessException | NullPointerException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
            return error;
        }
    }

    public static <T> T getFieldValue(Class<T> cast, Object o, Field f) {
        try {
            return (T) f.get(o);
        } catch(SecurityException | IllegalAccessException | IllegalArgumentException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
            return null;
        }
    }

    public static void setFieldValue(Object instance, Field f, Object value) {
        try {
            f.set(instance, value);
        } catch(SecurityException | IllegalAccessException | IllegalArgumentException ex) {
            LogManager.getLogger().warn(f + " - " + ex);
        }
    }

    public static <T> T getFieldValue(Class<T> cast, Class c, Object instance, String field) {
        Field f = getField(c, field);
        if(f == null) {
            return null;
        }
        return getFieldValue(cast, instance, f);
    }

    // -----------------------------------------------------------------------------------
    // food stats
    // -----------------------------------------------------------------------------------
    private final static Field FOOD_EXHAUSTION_LEVEL = getField(FoodStats.class, "field_75126_c"); // foodExhaustionLevel

    public static void setExhaustion(FoodStats stats, float f) {
        setFloat(stats, FOOD_EXHAUSTION_LEVEL, f);
    }

    public static float getExhaustion(FoodStats stats) {
        return getFloat(stats, FOOD_EXHAUSTION_LEVEL, 0);
    }

    private final static Field FOOD_SATURATION_LEVEL = getField(FoodStats.class, "field_75125_b"); // foodSaturationLevel

    public static void setSaturation(FoodStats stats, float f) {
        setFloat(stats, FOOD_SATURATION_LEVEL, f);
    }

    // -----------------------------------------------------------------------------------
    // player stats
    // -----------------------------------------------------------------------------------
    private final static Field FLY_SPEED = getField(PlayerAbilities.class, "field_75096_f"); // flySpeed

    public static void setFlySpeed(PlayerAbilities cap, float f) {
        setFloat(cap, FLY_SPEED, f);
    }

    private final static Field WALK_SPEED = getField(PlayerAbilities.class, "field_75097_g"); // walkSpeed

    public static void setWalkSpeed(PlayerAbilities cap, float f) {
        setFloat(cap, WALK_SPEED, f);
    }

    // -----------------------------------------------------------------------------------
    // PlayerList
    // -----------------------------------------------------------------------------------
    private final static Method SET_GAMETYPE = getMethod(PlayerList.class, "func_72381_a",
            ServerPlayerEntity.class, ServerPlayerEntity.class, ServerWorld.class); // setPlayerGameTypeBasedOnOther

    public static void setPlayerGameTypeBasedOnOther(PlayerList pl, ServerPlayerEntity target, ServerPlayerEntity source, ServerWorld sw) {
        try {
            SET_GAMETYPE.invoke(pl, target, source, sw);
        } catch(IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
            LogManager.getLogger().warn("setPlayerGameTypeBasedOnOther - " + ex);
        }
    }

    // -----------------------------------------------------------------------------------
    // minecraft server 
    // -----------------------------------------------------------------------------------
    private final static Field COMMAND_MANAGER = getField(DataPackRegistries.class, "field_240953_c_"); // commands

    public static void setCommandManager(MinecraftServer server, Commands manager) {
        setFieldValue(server.getDataPackRegistries(), COMMAND_MANAGER, manager);
    }

    private final static Field MODE = getField(Explosion.class, "field_222260_b"); // mode

    public static void setNoBreakMode(Explosion ex) {
        Explosion.Mode mode = getFieldValue(Explosion.Mode.class, ex, MODE);
        if(mode == Explosion.Mode.DESTROY) {
            setFieldValue(ex, MODE, Explosion.Mode.BREAK);
        }
    }

    private final static Field INTEGER_VALUE = getField(GameRules.IntegerValue.class, "field_223566_a"); // value

    public static void setIntegerValue(GameRules.IntegerValue rule, int value) {
        setInt(rule, INTEGER_VALUE, value);
    }

    // -----------------------------------------------------------------------------------
    // game type setter without update for dirty hack
    // -----------------------------------------------------------------------------------
    private final static Field GAME_TYPE = getField(PlayerInteractionManager.class, "field_73091_c");

    public static void setGameType(PlayerInteractionManager m, GameType type) {
        setFieldValue(m, GAME_TYPE, type);
    }

    // -----------------------------------------------------------------------------------
    // for clearing ai
    // -----------------------------------------------------------------------------------
    private final static Field GOALS = getField(GoalSelector.class, "field_220892_d");

    public static Set<PrioritizedGoal> getGoals(GoalSelector gs) {
        return getFieldValue(Set.class, gs, GOALS);
    }

    private final static Method SET_FIRE_INFO = getMethod(FireBlock.class, "func_180686_a", Block.class, int.class, int.class);

    public static void setFireInfo(Block b, int encouragement, int flammability) {
        FireBlock fireblock = (FireBlock) Blocks.FIRE;
        try {
            SET_FIRE_INFO.invoke(fireblock, b, encouragement, flammability);
        } catch(IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
            LogManager.getLogger().warn("setFireInfo - " + ex);
        }
    }
}