package com.atlassian.plugin.manager.store;
   
   import com.atlassian.annotations.ExperimentalApi;
   import com.atlassian.plugin.manager.PluginPersistentState;
   import com.atlassian.plugin.manager.PluginPersistentStateStore;
   
   /**
    * A read-only implementation of {@link PluginPersistentStateStore} which returns a state provided on construction.
    * <p/>
   * The held {@link PluginPersistentState} is not read-only - external modification to it is not prevented, and will be reflected
   * in the state returned from {@link #load()}.
   *
   * @since 3.2.0
   */
  @ExperimentalApi
  public class LoadOnlyPluginPersistentStateStore implements PluginPersistentStateStore
  {
      private final PluginPersistentState pluginPersistentState;
  
      public LoadOnlyPluginPersistentStateStore()
      {
          this(PluginPersistentState.Builder.create().toState());
      }
  
      public LoadOnlyPluginPersistentStateStore(final PluginPersistentState pluginPersistentState)
      {
          this.pluginPersistentState = pluginPersistentState;
      }
  
      /**
       * This implementation ignores the provided state and throws.
       *
       * @param state ignored
       * @throws IllegalStateException always
       */
      @Override
      public void save(final PluginPersistentState state)
      {
          throw new IllegalStateException("Cannot save state to " + LoadOnlyPluginPersistentStateStore.class);
      }
  
      @Override
      public PluginPersistentState load()
      {
          return pluginPersistentState;
      }
  }