shuffle classes around

src/main/java/com/falsepattern/lib/mapping/MappingManager.java

@@ -0,0 +1,118 @@
+package com.falsepattern.lib.mapping;
+
+import com.falsepattern.lib.internal.CoreLoadingPlugin;
+import com.falsepattern.lib.internal.FalsePatternLib;
+import com.falsepattern.lib.mapping.storage.Lookup;
+import com.falsepattern.lib.mapping.types.MappingType;
+import com.falsepattern.lib.mapping.types.NameType;
+import com.falsepattern.lib.mapping.types.UniversalClass;
+import com.falsepattern.lib.mapping.types.UniversalField;
+import com.falsepattern.lib.mapping.types.UniversalMethod;
+import com.falsepattern.lib.util.ResourceUtil;
+import lombok.SneakyThrows;
+import lombok.val;
+import org.objectweb.asm.tree.FieldInsnNode;
+import org.objectweb.asm.tree.MethodInsnNode;
+
+import java.util.HashMap;
+
+public class MappingManager {
+    private static boolean initialized = false;
+
+    private static final Lookup<UniversalClass> internalLookup = new Lookup<>();
+    private static final Lookup<UniversalClass> regularLookup = new Lookup<>();
+
+
+    @SneakyThrows
+    private static synchronized void initialize() {
+        if (initialized) return;
+        initialized = true;
+        long start = System.nanoTime();
+        val stringPool = new HashMap<String, String>();
+        {
+            val classMappings = ResourceUtil.getResourceStringFromJar("/classes.csv", FalsePatternLib.class).split("\n");
+            for (int i = 1; i < classMappings.length; i++) {
+                val line = classMappings[i].split(",");
+                val clazz = new UniversalClass(line, stringPool);
+                internalLookup.unwrap(clazz.internalName, clazz);
+                regularLookup.unwrap(clazz.regularName, clazz);
+            }
+        }
+        {
+            val fieldMappings = ResourceUtil.getResourceStringFromJar("/fields.csv", FalsePatternLib.class).split("\n");
+            for (int i = 1; i < fieldMappings.length; i++) {
+                val line = fieldMappings[i].split(",");
+                val clazz = internalLookup.get(MappingType.Notch, line[0].substring(0, line[0].lastIndexOf('/')));
+                new UniversalField(clazz, line, stringPool);
+            }
+        }
+        {
+            val methodMappings = ResourceUtil.getResourceStringFromJar("/methods.csv", FalsePatternLib.class).split("\n");
+            for (int i = 1; i < methodMappings.length; i++) {
+                val line = methodMappings[i].split(",");
+                val clazz = internalLookup.get(MappingType.Notch, line[0].substring(0, line[0].lastIndexOf('/')));
+                new UniversalMethod(clazz, line, stringPool);
+            }
+        }
+        long end = System.nanoTime();
+        System.out.println("Parsed in " + (end - start) / 1000000 + "ms");
+    }
+
+    public static UniversalClass classForName(NameType nameType, MappingType mappingType, String className) throws ClassNotFoundException {
+        initialize();
+        try {
+            switch (nameType) {
+                case Internal:
+                    return internalLookup.get(mappingType, className);
+                case Regular:
+                    return regularLookup.get(mappingType, className);
+                default:
+                    throw new IllegalArgumentException("Invalid enum value " + nameType);
+            }
+        } catch (Lookup.LookupException e) {
+            throw new ClassNotFoundException("Could not find class \"" + className + "\" with " + nameType.name().toLowerCase() + " name in the " + mappingType.name() + " mapping.");
+        }
+    }
+
+    public static UniversalField getField(FieldInsnNode instruction) throws ClassNotFoundException,
+            NoSuchFieldException {
+        if (!CoreLoadingPlugin.isObfuscated()) {
+            try {
+                return classForName(NameType.Internal, MappingType.MCP, instruction.owner).getField(MappingType.MCP, instruction.name);
+            } catch (ClassNotFoundException e) {
+                throw new ClassNotFoundException("Could not find the class " + instruction.owner + " in the MCP mappings. Are you sure it's a Minecraft class? (we're in dev, cannot use SRG or Notch here).");
+            }
+        } else {
+            try {
+                return classForName(NameType.Internal, MappingType.SRG, instruction.owner).getField(MappingType.SRG, instruction.name);
+            } catch (ClassNotFoundException e) {
+                try {
+                    return classForName(NameType.Internal, MappingType.Notch, instruction.owner).getField(MappingType.Notch, instruction.name);
+                } catch (ClassNotFoundException ex) {
+                    throw new ClassNotFoundException("Could not find the class " + instruction.owner + " neither in the SRG nor in the Notch mappings. Are you sure it's a Minecraft class? (we're in obf, cannot use MCP here)");
+                }
+            }
+        }
+    }
+
+    public static UniversalMethod getMethod(MethodInsnNode instruction)
+            throws ClassNotFoundException, NoSuchMethodException {
+        if (!CoreLoadingPlugin.isObfuscated()) {
+            try {
+                return classForName(NameType.Internal, MappingType.MCP, instruction.owner).getMethod(MappingType.MCP, instruction.name, instruction.desc);
+            } catch (ClassNotFoundException e) {
+                throw new ClassNotFoundException("Could not find the class " + instruction.owner + " in the MCP mappings. Are you sure it's a Minecraft class? (we're in dev, cannot use SRG or Notch here).");
+            }
+        } else {
+            try {
+                return classForName(NameType.Internal, MappingType.SRG, instruction.owner).getMethod(MappingType.SRG, instruction.name, instruction.desc);
+            } catch (ClassNotFoundException e) {
+                try {
+                    return classForName(NameType.Internal, MappingType.Notch, instruction.owner).getMethod(MappingType.Notch, instruction.name, instruction.desc);
+                } catch (ClassNotFoundException ex) {
+                    throw new ClassNotFoundException("Could not find the class " + instruction.owner + " neither in the SRG nor in the Notch mappings. Are you sure it's a Minecraft class? (we're in obf, cannot use MCP here)");
+                }
+            }
+        }
+    }
+}