content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.nacos.consistency.snapshot;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Snapshot write interface.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public class Writer {
      
      private final Map<String, LocalFileMeta> files = new HashMap<>();
      
      private String path;
      
      public Writer(String path) {
          this.path = path;
      }
      
      public String getPath() {
          return path;
      }
      
      /**
       * Adds a snapshot file without metadata.
       *
       * @param fileName file name
       * @return true on success
       */
      public boolean addFile(final String fileName) {
          files.put(fileName, new LocalFileMeta().append("file-name", fileName));
          return true;
      }
      
      /**
       * Adds a snapshot file with metadata.
       *
       * @param fileName file name
       * @return true on success
       */
      public boolean addFile(final String fileName, final LocalFileMeta meta) {
          files.put(fileName, meta);
          return true;
      }
      
      /**
       * Remove a snapshot file.
       *
       * @param fileName file name
       * @return true on success
       */
      public boolean removeFile(final String fileName) {
          files.remove(fileName);
          return true;
      }
      
      public Map<String, LocalFileMeta> listFiles() {
          return Collections.unmodifiableMap(files);
      }
      
  }
  