text: /**
      Licensed to OffGrid Networks (OGN) under one
      or more contributor license agreements.  See the NOTICE file
      distributed with this work for additional information
      regarding copyright ownership.  OGN 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://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.
  */
  
  /* jshint sub:true, laxcomma:true, laxbreak:true */
  
  var fs = require('fs');
  var path = require('path');
  var PluginInfo = require('./PluginInfo');
  var events = require('../events');
  
  function PluginInfoProvider() {
      this._cache = {};
      this._getAllCache = {};
  }
  
  PluginInfoProvider.prototype.get = function(dirName) {
      var absPath = path.resolve(dirName);
      if (!this._cache[absPath]) {
          this._cache[absPath] = new PluginInfo(dirName);
      }
      return this._cache[absPath];
  };
  
  // Normally you don't need to put() entries, but it's used
  // when copying plugins, and in unit tests.
  PluginInfoProvider.prototype.put = function(pluginInfo) {
      var absPath = path.resolve(pluginInfo.dir);
      this._cache[absPath] = pluginInfo;
  };
  
  // Used for plugin search path processing.
  // Given a dir containing multiple plugins, create a PluginInfo object for
  // each of them and return as array.
  // Should load them all in parallel and return a promise, but not yet.
  PluginInfoProvider.prototype.getAllWithinSearchPath = function(dirName) {
      var absPath = path.resolve(dirName);
      if (!this._getAllCache[absPath]) {
          this._getAllCache[absPath] = getAllHelper(absPath, this);
      }
      return this._getAllCache[absPath];
  };
  
  function getAllHelper(absPath, provider) {
      if (!fs.existsSync(absPath)){
          return [];
      }
      // If dir itself is a plugin, return it in an array with one element.
      if (fs.existsSync(path.join(absPath, 'plugin.xml'))) {
          return [provider.get(absPath)];
      }
      var subdirs = fs.readdirSync(absPath);
      var plugins = [];
      subdirs.forEach(function(subdir) {
          var d = path.join(absPath, subdir);
          if (fs.existsSync(path.join(d, 'plugin.xml'))) {
              try {
                  plugins.push(provider.get(d));
              } catch (e) {
                  events.emit('warn', 'Error parsing ' + path.join(d, 'plugin.xml.\n' + e.stack));
              }
          }
      });
      return plugins;
  }
  
  module.exports = PluginInfoProvider;
  