content: /*
   * 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.distributedlog.config;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.util.Properties;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Writer to write properties to files.
   */
  public class PropertiesWriter {
      static final Logger LOG = LoggerFactory.getLogger(PropertiesWriter.class);
  
      final FileOutputStream outputStream;
      final File configFile;
      final Properties properties;
  
      public PropertiesWriter() throws Exception {
          this(null);
      }
  
      public PropertiesWriter(File configFile) throws Exception {
          if (null == configFile) {
              this.configFile = File.createTempFile("temp", ".conf");
          } else {
              this.configFile = configFile;
          }
          this.configFile.deleteOnExit();
          this.properties = new Properties();
          this.outputStream = new FileOutputStream(this.configFile);
      }
  
      public void setProperty(String key, String value) {
          properties.setProperty(key, value);
      }
  
      public void removeProperty(String key) {
          properties.remove(key);
      }
  
      public void save() throws Exception {
          FileOutputStream outputStream = new FileOutputStream(configFile);
          properties.store(outputStream, null);
          configFile.setLastModified(configFile.lastModified() + 1000);
          if (LOG.isDebugEnabled()) {
              LOG.debug("save modified={}", configFile.lastModified());
          }
      }
  
      public File getFile() {
          return configFile;
      }
  }
  