content: /*
   * Copyright (C) 2012-present the original author or authors.
   *
   * Licensed 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 com.alipay.antchain.bridge.plugins.lib.pf4j.processor;
  
  import com.alipay.antchain.bridge.plugins.lib.BBCService;
  
  import javax.annotation.processing.Filer;
  import javax.lang.model.element.Element;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.util.Map;
  import java.util.Set;
  import java.util.regex.Pattern;
  
  /**
   * It's a storage (database) that persists {@link BBCService}s.
   * The standard operations supported by storage are {@link #read} and {@link #write}.
   * The storage is populated by {@link ServiceAnnotationProcessor}.
   *
   * <p>
   * We modify the code from {@link org.pf4j.processor.ExtensionStorage} to satisfy our needs.
   * </p>
   */
  public abstract class ExtensionStorage {
  
      private static final Pattern COMMENT = Pattern.compile("#.*");
      private static final Pattern WHITESPACE = Pattern.compile("\\s+");
  
      protected final ServiceAnnotationProcessor processor;
  
      public ExtensionStorage(ServiceAnnotationProcessor processor) {
          this.processor = processor;
      }
  
      public abstract Map<String, Set<String>> read();
  
      public abstract void write(Map<String, Set<String>> extensions);
  
      /**
       * Helper method.
       */
      protected Filer getFiler() {
          return processor.getProcessingEnvironment().getFiler();
      }
  
      /**
       * Helper method.
       */
      protected void error(String message, Object... args) {
          processor.error(message, args);
      }
  
      /**
       * Helper method.
       */
      protected void error(Element element, String message, Object... args) {
          processor.error(element, message, args);
      }
  
      /**
       * Helper method.
       */
      protected void info(String message, Object... args) {
          processor.info(message, args);
      }
  
      /**
       * Helper method.
       */
      protected void info(Element element, String message, Object... args) {
          processor.info(element, message, args);
      }
  
      public static void read(Reader reader, Set<String> entries) throws IOException {
          try (BufferedReader bufferedReader = new BufferedReader(reader)) {
              String line;
              while ((line = bufferedReader.readLine()) != null) {
                  line = COMMENT.matcher(line).replaceFirst("");
                  line = WHITESPACE.matcher(line).replaceAll("");
                  if (line.length() > 0) {
                      entries.add(line);
                  }
              }
          }
      }
  
  }
  