/*
 * Copyright 2011 Google Inc.
 *
 * 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.google.gwt.dev.codeserver;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * An in-memory directory of all the modules available on this code server. The {@link WebServer}
 * uses this directory to find the {@link ModuleState} associated with a URL and to list all the
 * modules on the front page.
 */
class Modules implements Iterable<String> {
  private final Map<String, ModuleState> moduleStateMap =
      new HashMap<String, ModuleState>();

  /**
   * Adds a {@link ModuleState} to the map.
   * @param state the module state to map
   */
  public void addModuleState(ModuleState state) {
    moduleStateMap.put(state.getModuleName(), state);
  }

  /**
   * Retrieves a {@link ModuleState} corresponding to a given module name.
   * @param moduleName the module name to look up
   */
  public ModuleState get(String moduleName) {
    return moduleStateMap.get(moduleName);
  }

  /**
   * Iterates over the list of modules.
   */
  @Override
  public Iterator<String> iterator() {
    return moduleStateMap.keySet().iterator();
  }
}