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

import com.google.inject.Key;
import com.google.inject.ProvidedBy;
import com.google.inject.internal.InjectorImpl.JitLimitation;
import com.google.inject.spi.Dependency;
import javax.inject.Provider;

/**
 * An {@link InternalFactory} for {@literal @}{@link ProvidedBy} bindings.
 *
 * @author [email protected] (Sam Berlin)
 */
class ProvidedByInternalFactory extends ProviderInternalFactory implements DelayedInitialize {

  private final Class rawType;
  private final Class> providerType;
  private final Key> providerKey;
  private BindingImpl> providerBinding;
  private ProvisionListenerStackCallback provisionCallback;

  ProvidedByInternalFactory(
      Class rawType,
      Class> providerType,
      Key> providerKey) {
    super(providerKey);
    this.rawType = rawType;
    this.providerType = providerType;
    this.providerKey = providerKey;
  }

  void setProvisionListenerCallback(ProvisionListenerStackCallback listener) {
    provisionCallback = listener;
  }

  @Override
  public void initialize(InjectorImpl injector, Errors errors) throws ErrorsException {
    providerBinding =
        injector.getBindingOrThrow(providerKey, errors, JitLimitation.NEW_OR_EXISTING_JIT);
  }

  @Override
  public T get(InternalContext context, Dependency dependency, boolean linked)
      throws InternalProvisionException {
    BindingImpl> localProviderBinding = providerBinding;
    if (localProviderBinding == null) {
      throw new IllegalStateException("not initialized");
    }
    Key> localProviderKey = providerKey;
    context.pushState(localProviderKey, localProviderBinding.getSource());

    try {
      Provider provider =
          localProviderBinding.getInternalFactory().get(context, dependency, true);
      return circularGet(provider, context, dependency, provisionCallback);
    } catch (InternalProvisionException ipe) {
      throw ipe.addSource(localProviderKey);
      } finally {
        context.popState();

    }
  }

  @Override
  protected T provision(
      javax.inject.Provider provider,
      Dependency dependency,
      ConstructionContext constructionContext)
      throws InternalProvisionException {
    try {
      Object o = super.provision(provider, dependency, constructionContext);
      if (o != null && !rawType.isInstance(o)) {
        throw InternalProvisionException.subtypeNotProvided(providerType, rawType);
      }
      @SuppressWarnings("unchecked") // protected by isInstance() check above
      T t = (T) o;
      return t;
    } catch (RuntimeException e) {
      throw InternalProvisionException.errorInProvider(e).addSource(source);
    }
  }
}