text: /*
   * 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 org.pf4j;
  
  import org.pf4j.util.FileUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.List;
  
  /**
   * The default implementation for {@link PluginStatusProvider}.
   * The enabled plugins are read from {@code enabled.txt} file and
   * the disabled plugins are read from {@code disabled.txt} file.
   *
   * @author Decebal Suiu
   * @author Mário Franco
   */
  public class DefaultPluginStatusProvider implements PluginStatusProvider {
  
      private static final Logger log = LoggerFactory.getLogger(DefaultPluginStatusProvider.class);
  
      private final Path pluginsRoot;
  
      private List<String> enabledPlugins;
      private List<String> disabledPlugins;
  
      public DefaultPluginStatusProvider(Path pluginsRoot) {
          this.pluginsRoot = pluginsRoot;
  
          try {
              // create a list with plugin identifiers that should be only accepted by this manager (whitelist from plugins/enabled.txt file)
              enabledPlugins = FileUtils.readLines(getEnabledFilePath(), true);
              log.info("Enabled plugins: {}", enabledPlugins);
  
              // create a list with plugin identifiers that should not be accepted by this manager (blacklist from plugins/disabled.txt file)
              disabledPlugins = FileUtils.readLines(getDisabledFilePath(), true);
              log.info("Disabled plugins: {}", disabledPlugins);
          } catch (IOException e) {
              log.error(e.getMessage(), e);
          }
      }
  
      @Override
      public boolean isPluginDisabled(String pluginId) {
          if (disabledPlugins.contains(pluginId)) {
              return true;
          }
  
          return !enabledPlugins.isEmpty() && !enabledPlugins.contains(pluginId);
      }
  
      @Override
      public void disablePlugin(String pluginId) {
          if (isPluginDisabled(pluginId)) {
              // do nothing
              return;
          }
  
          if (Files.exists(getEnabledFilePath())) {
              enabledPlugins.remove(pluginId);
  
              try {
                  FileUtils.writeLines(enabledPlugins, getEnabledFilePath());
              } catch (IOException e) {
                  throw new PluginRuntimeException(e);
              }
          } else {
              disabledPlugins.add(pluginId);
  
              try {
                  FileUtils.writeLines(disabledPlugins, getDisabledFilePath());
              } catch (IOException e) {
                  throw new PluginRuntimeException(e);
              }
          }
      }
  
      @Override
      public void enablePlugin(String pluginId) {
          if (!isPluginDisabled(pluginId)) {
              // do nothing
              return;
          }
  
          if (Files.exists(getEnabledFilePath())) {
              enabledPlugins.add(pluginId);
  
              try {
                  FileUtils.writeLines(enabledPlugins, getEnabledFilePath());
              } catch (IOException e) {
                  throw new PluginRuntimeException(e);
              }
          } else {
              disabledPlugins.remove(pluginId);
  
              try {
                  FileUtils.writeLines(disabledPlugins, getDisabledFilePath());
              } catch (IOException e) {
                  throw new PluginRuntimeException(e);
              }
          }
      }
  
      public Path getEnabledFilePath() {
          return getEnabledFilePath(pluginsRoot);
      }
  
      public Path getDisabledFilePath() {
          return getDisabledFilePath(pluginsRoot);
      }
  
      public static Path getEnabledFilePath(Path pluginsRoot) {
          return pluginsRoot.resolve("enabled.txt");
      }
  
      public static Path getDisabledFilePath(Path pluginsRoot) {
          return pluginsRoot.resolve("disabled.txt");
      }
  
  }
  