package com.atlassian.plugin;
   
   import com.atlassian.fugue.Option;
   import com.google.common.base.Objects;
   
   import static com.atlassian.fugue.Option.some;
   import static com.google.common.base.Preconditions.checkNotNull;
   
   /**
   * <p>Represents a plugin permission as parsed from the plugin descriptor.
   * <p>A plugin permission here is:
   * <ul>
   * <li>A <strong>name</strong> which denotes the permission itself.</li>
   * <li>An <strong>{@link InstallationMode installation mode}</strong> which tells whether the permission is required
   * for a given type of installation of the plugin. No installation mode defined means that the permission is always
   * required.</li>
   * </ul>
   *
   * @since 3.0
   */
  public final class PluginPermission {
      public final static PluginPermission ALL = new PluginPermission(Permissions.ALL_PERMISSIONS);
      public final static PluginPermission EXECUTE_JAVA = new PluginPermission(Permissions.EXECUTE_JAVA);
  
      private final String name;
      private final Option<InstallationMode> installationMode;
  
      public PluginPermission(String name) {
          this(checkNotNull(name), Option.<InstallationMode>none());
      }
  
      public PluginPermission(String name, InstallationMode installationMode) {
          this(checkNotNull(name), some(checkNotNull(installationMode)));
      }
  
      public PluginPermission(String name, Option<InstallationMode> installationMode) {
          this.name = checkNotNull(name);
          this.installationMode = checkNotNull(installationMode);
      }
  
      public String getName() {
          return name;
      }
  
      /**
       * The installation mode for that permission.
       *
       * @return the installation mode as an {@link Option}. If the option is {@link Option#none()}
       * then this means this permission is always valid, however when it is {@link Option#defined() defined}
       * it will only be valid for the given installation mode.
       */
      public Option<InstallationMode> getInstallationMode() {
          return installationMode;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
  
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          final PluginPermission that = (PluginPermission) o;
          return Objects.equal(this.name, that.name);
      }
  
      @Override
      public int hashCode() {
          return Objects.hashCode(this.name);
      }
  }