161 lines
6.8 KiB
Java
161 lines
6.8 KiB
Java
package modtweaker2.helpers;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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public class ReflectionHelper {
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/**
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* Creates a new instance with the provided constructor and arguments.
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* @param constructor The constructor of the class for which a new instance should be created.
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* @param arguments Array of objects to be passed as arguments to the constructor call.
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* @return A new object created by calling the constructor.
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*/
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public static <T> T getInstance(Constructor<T> constructor, Object... arguments) {
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try {
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return constructor.newInstance(arguments);
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} catch (Exception e) { LogHelper.logError("Exception creating instance of " + constructor.getClass().getName(), e); }
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return null;
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}
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/**
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* Obtains the constructor for the named class identified by the parameter types.
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* @param className The fully qualified name of the class.
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* @param argumentTypes Parameter types to identify the constructor.
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* @return Constructor object representing the declared constructor for the parameter types.
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*/
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public static Constructor<?> getConstructor(final String className, final Class<?>... argumentTypes) {
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if(className == null || argumentTypes == null) {
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LogHelper.logError("The provided class name or arguments can't be null.");
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return null;
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}
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try {
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Class<?> clazz = Class.forName(className);
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Constructor<?> constructor = clazz.getDeclaredConstructor(argumentTypes);
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constructor.setAccessible(true);
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return constructor;
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} catch (Exception ex) { LogHelper.logError("Exception getting constructor of " + className, ex); }
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return null;
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}
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/**
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* Obtains the constructor for the class identified by the parameter types.
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* @param clazz The Class for which the constructor should be obtained.
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* @param argumentTypes Parameter types to identify the constructor.
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* @return Constructor object representing the declared constructor for the parameter types.
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*/
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public static <T> Constructor<T> getConstructor(Class<T> clazz, Class<?>... types) {
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try {
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Constructor<T> constructor = clazz.getDeclaredConstructor(types);
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constructor.setAccessible(true);
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return constructor;
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} catch (Exception ex) { LogHelper.logError("Exception getting constructor of " + clazz.getName(), ex); }
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return null;
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}
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/**
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* Returns the value of a private field for an object instance.
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* @param object An object instance from which the field value is to be extracted.
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* @param fieldNames A list of field names for which the value should be extracted.
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* The functions returns value of the first field found.
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* @return The value of the provided field name.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T getObject(Object object, String... fieldNames) {
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Class<?> cls = object.getClass();
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for (String field : fieldNames) {
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try {
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Field result = cls.getDeclaredField(field);
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result.setAccessible(true);
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return (T) result.get(object);
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} catch (Exception ex) { LogHelper.logError("Exception in getObject()", ex); }
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}
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LogHelper.logError("Could not retrieve any object for the provided field names.");
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return null;
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}
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/**
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* Returns the value of a private final field for an object instance and removes the final modifier.
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* @param object An object instance from which the field value is to be extracted.
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* @param fieldNames A list of field names for which the value should be extracted.
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* The functions returns value of the first field found.
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* @return The value of the provided field name.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T getFinalObject(Object object, String... fieldNames) {
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Class<?> cls = object.getClass();
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for (String field : fieldNames) {
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try {
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Field result = cls.getDeclaredField(field);
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result.setAccessible(true);
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Field modifiersField = Field.class.getDeclaredField("modifiers");
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modifiersField.setAccessible(true);
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modifiersField.setInt(result, result.getModifiers() & ~Modifier.FINAL);
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return (T) result.get(object);
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} catch (Exception ex) { LogHelper.logError("Exception in getFinalObject()", ex); }
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}
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LogHelper.logError("Could not retrieve any final object for the provided field names.");
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return null;
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}
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/**
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* Returns the value of a private static field for a class.
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* @param clazz The class for which the field value is to be extracted.
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* @param fieldNames A list of field names for which the value should be extracted.
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* @return The value of the provided field name.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T getStaticObject(Class<?> clazz, String... fieldNames) {
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for (String field : fieldNames) {
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try {
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Field result = clazz.getDeclaredField(field);
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result.setAccessible(true);
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return (T) result.get(null);
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} catch (Exception e) { LogHelper.logError("Exception in getStaticObject()", e); }
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}
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LogHelper.logError("Could not retrieve any static object for the provided field names.");
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return null;
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}
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/**
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* Returns the value of a private static field for a class.
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* @param className The fully qualified name of the class.
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* @param fieldNames A list of field names for which the value should be extracted.
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* @return The value of the provided field name.
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*/
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public static <T> T getStaticObject(String className, String... fieldNames) {
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try {
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Class<?> clazz = Class.forName(className);
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return getStaticObject(clazz, fieldNames);
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} catch (ClassNotFoundException e) { LogHelper.logError("Exception in getStaticObject()", e); }
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LogHelper.logError("Could not retrieve any static object for the provided field names.");
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return null;
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}
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public static void setPrivateValue(Class<?> cls, String field, int var) {
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try {
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Field f = cls.getDeclaredField(field);
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f.setAccessible(true);
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f.setInt(null, var);
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} catch (Exception e) { LogHelper.logError("Exception in setPrivateValue()", e); }
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}
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@SuppressWarnings({ "rawtypes", "unchecked" })
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public static void setPrivateValue( Class cls, Object o, String field, Object var) {
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net.minecraftforge.fml.relauncher.ReflectionHelper.setPrivateValue(cls, o, var, field);
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}
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}
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