/**
 * Copyright (C) 2008 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.inject;

import com.google.inject.commands.GetProviderCommand;

/**
 * Handles {@link Binder#getProvider} commands.
 *
 * @author crazybob@google.com (Bob Lee)
 * @author jessewilson@google.com (Jesse Wilson)
 */
class GetProviderProcessor extends CommandProcessor {

  private final InjectorImpl injector;

  GetProviderProcessor(InjectorImpl injector) {
    super(injector.errorHandler);
    this.injector = injector;
  }

  @Override public <T> Boolean visitGetProvider(GetProviderCommand<T> command) {
    try {
      // ensure the provider can be created
      injector.getProvider(command.getKey());
    } catch (CreationException e) {
      injector.handleMissingBinding(command.getSource(), command.getKey());
    }

    return true;
  }
}