forked from community/device-mgt-core
Dharmakeerthi Lasantha
1 year ago
parent
5098c652ca
commit
349bb0a3dc
@ -1,122 +0,0 @@
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/*
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* Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
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*
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* Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package io.entgra.device.mgt.core.device.mgt.core.search.util;
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import io.entgra.device.mgt.core.device.mgt.common.search.Condition;
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import sun.reflect.ConstructorAccessor;
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import sun.reflect.FieldAccessor;
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import sun.reflect.ReflectionFactory;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Array;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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/**
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* Changes the Enum values of a given class.
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*/
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public class ChangeEnumValues {
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private static ReflectionFactory reflectionFactory = ReflectionFactory.getReflectionFactory();
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public ChangeEnumValues() {}
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private static void setFailSafeFieldValue(Field field, Object target, Object value) throws NoSuchFieldException,
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IllegalAccessException {
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field.setAccessible(true);
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Field modifiersField = Field.class.getDeclaredField("modifiers");
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modifiersField.setAccessible(true);
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int modifiers = modifiersField.getInt(field);
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modifiers &= ~Modifier.FINAL;
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modifiersField.setInt(field, modifiers);
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FieldAccessor fa = reflectionFactory.newFieldAccessor(field, false);
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fa.set(target, value);
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}
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private static void blankField(Class<?> enumClass, String fieldName) throws NoSuchFieldException,
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IllegalAccessException {
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for (Field field : Class.class.getDeclaredFields()) {
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if (field.getName().contains(fieldName)) {
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AccessibleObject.setAccessible(new Field[]{field}, true);
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setFailSafeFieldValue(field, enumClass, null);
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break;
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}
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}
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}
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private static void cleanEnumCache(Class<?> enumClass) throws NoSuchFieldException, IllegalAccessException {
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blankField(enumClass, "enumConstantDirectory");
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blankField(enumClass, "enumConstants");
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}
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private static ConstructorAccessor getConstructorAccessor(Class<?> enumClass, Class<?>[] additionalParameterTypes)
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throws NoSuchMethodException {
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Class<?>[] parameterTypes = new Class[additionalParameterTypes.length + 2];
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parameterTypes[0] = String.class;
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parameterTypes[1] = int.class;
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System.arraycopy(additionalParameterTypes, 0, parameterTypes, 2, additionalParameterTypes.length);
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return reflectionFactory.newConstructorAccessor(enumClass.getDeclaredConstructor(parameterTypes));
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}
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private static Object makeEnum(Class<?> enumClass, String value, int ordinal, Class<?>[] additionalTypes,
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Object[] additionalValues) throws Exception {
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Object[] parms = new Object[additionalValues.length + 2];
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parms[0] = value;
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parms[1] = ordinal;
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System.arraycopy(additionalValues, 0, parms, 2, additionalValues.length);
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return enumClass.cast(getConstructorAccessor(enumClass, additionalTypes).newInstance(parms));
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}
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/**
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* Add an enum instance to the enum class given as argument
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*
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* @param <T> the type of the enum
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* @param enumType the class of the enum to be modified
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* @param enumName the name of the new enum instance to be added to the class.
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*/
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public static <T extends Enum<?>> void addEnum(Class<T> enumType, String enumName) {
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if (!Enum.class.isAssignableFrom(enumType)) {
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throw new RuntimeException("class " + enumType + " is not an instance of Enum");
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}
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Field valuesField = null;
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Field[] fields = Condition.State.class.getDeclaredFields();
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for (Field field : fields) {
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if (field.getName().contains("$VALUES")) {
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valuesField = field;
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break;
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}
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}
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AccessibleObject.setAccessible(new Field[]{valuesField}, true);
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try {
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T[] previousValues = (T[]) valuesField.get(enumType);
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List<T> values = new ArrayList<T>(Arrays.asList(previousValues));
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T newValue = (T) makeEnum(enumType, enumName, values.size(), new Class<?>[]{}, new Object[]{});
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values.add(newValue);
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setFailSafeFieldValue(valuesField, null, values.toArray((T[]) Array.newInstance(enumType, 0)));
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cleanEnumCache(enumType);
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} catch (Exception e) {
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throw new RuntimeException(e.getMessage(), e);
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}
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}
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}
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