/**
 * 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.internal.BindingImpl;
import com.google.inject.internal.Errors;
import com.google.inject.internal.ErrorsException;
import com.google.inject.internal.InternalContext;
import com.google.inject.internal.InternalFactory;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.PrivateEnvironment;
import java.util.Map;

class ExposedKeyFactory<T> implements InternalFactory<T>, BindingProcessor.CreationListener {
  private final Key<T> key;
  private final PrivateEnvironment privateEnvironment;
  private BindingImpl<T> delegate;

  public ExposedKeyFactory(Key<T> key, PrivateEnvironment privateEnvironment) {
    this.key = key;
    this.privateEnvironment = privateEnvironment;
  }

  public void notify(Map<PrivateEnvironment, InjectorImpl> privateInjectors, Errors errors) {
    InjectorImpl privateInjector = privateInjectors.get(privateEnvironment);
    BindingImpl<T> explicitBinding = privateInjector.state.getExplicitBinding(key);

    if (explicitBinding.getInternalFactory() == this) {
      errors.withSource(explicitBinding.getSource()).exposedButNotBound(key);
      return;
    }

    this.delegate = explicitBinding;
  }

  public T get(Errors errors, InternalContext context, Dependency<?> dependency)
      throws ErrorsException {
    return delegate.getInternalFactory().get(errors, context, dependency);
  }
}