| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.beam.sdk.io.cdap; |
| |
| import com.google.common.reflect.TypeToken; |
| import io.cdap.cdap.api.annotation.Name; |
| import io.cdap.cdap.api.plugin.PluginConfig; |
| import io.cdap.cdap.common.lang.InstantiatorFactory; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| import javax.annotation.Nullable; |
| import org.checkerframework.checker.initialization.qual.Initialized; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** Class for getting any filled {@link PluginConfig} configuration object. */ |
| public class PluginConfigInstantiationUtils { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(PluginConfigInstantiationUtils.class); |
| private static final String MACRO_FIELDS_FIELD_NAME = "macroFields"; |
| |
| /** |
| * Method for instantiating {@link PluginConfig} object of specific class {@param configClass}. |
| * After instantiating, it will go over all {@link Field}s with the {@link Name} annotation and |
| * set the appropriate parameter values from the {@param params} map for them. |
| * |
| * @param params map of config fields, where key is the name of the field, value must be String or |
| * boxed primitive |
| * @return Config object for given map of arguments and configuration class |
| */ |
| static @Nullable <T extends PluginConfig> T getPluginConfig( |
| Map<String, Object> params, Class<T> configClass) { |
| // Validate configClass |
| if (configClass == null) { |
| throw new IllegalArgumentException("Config class must be not null!"); |
| } |
| List<Field> allFields = new ArrayList<>(); |
| Class<?> currClass = configClass; |
| while (currClass != null && !currClass.equals(Object.class)) { |
| allFields.addAll( |
| Arrays.stream(currClass.getDeclaredFields()) |
| .filter(f -> !Modifier.isStatic(f.getModifiers())) |
| .collect(Collectors.toList())); |
| currClass = currClass.getSuperclass(); |
| } |
| InstantiatorFactory instantiatorFactory = new InstantiatorFactory(false); |
| |
| @Initialized T config = instantiatorFactory.get(TypeToken.of(configClass)).create(); |
| |
| if (config != null) { |
| for (Field field : allFields) { |
| field.setAccessible(true); |
| |
| Class<?> fieldType = field.getType(); |
| |
| Name declaredAnnotation = field.getDeclaredAnnotation(Name.class); |
| Object fieldValue = |
| declaredAnnotation != null ? params.get(declaredAnnotation.value()) : null; |
| |
| if (fieldValue != null && fieldType.equals(fieldValue.getClass())) { |
| try { |
| field.set(config, fieldValue); |
| } catch (IllegalAccessException e) { |
| LOG.error("Can not set a field with value {}", fieldValue); |
| } |
| } else if (field.getName().equals(MACRO_FIELDS_FIELD_NAME)) { |
| try { |
| field.set(config, Collections.emptySet()); |
| } catch (IllegalAccessException e) { |
| LOG.error("Can not set macro fields"); |
| } |
| } |
| } |
| } |
| return config; |
| } |
| } |