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/**
 * 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 org.elasticsearch.util.inject;

import org.elasticsearch.util.inject.internal.Errors;
import org.elasticsearch.util.inject.internal.ErrorsException;
import org.elasticsearch.util.inject.internal.InternalContext;
import org.elasticsearch.util.inject.internal.InternalFactory;
import org.elasticsearch.util.inject.internal.ToStringBuilder;
import org.elasticsearch.util.inject.spi.Dependency;

/**
 * A placeholder which enables us to swap in the real factory once the injector is created.
 */
class FactoryProxy implements InternalFactory, BindingProcessor.CreationListener {

  private final InjectorImpl injector;
  private final Key key;
  private final Key targetKey;
  private final Object source;

  private InternalFactory targetFactory;

  FactoryProxy(InjectorImpl injector, Key key, Key targetKey, Object source) {
    this.injector = injector;
    this.key = key;
    this.targetKey = targetKey;
    this.source = source;
  }

  public void notify(final Errors errors) {
    try {
      targetFactory = injector.getInternalFactory(targetKey, errors.withSource(source));
    } catch (ErrorsException e) {
      errors.merge(e.getErrors());
    }
  }

  public T get(Errors errors, InternalContext context, Dependency dependency)
      throws ErrorsException {
    return targetFactory.get(errors.withSource(targetKey), context, dependency);
  }

  @Override public String toString() {
    return new ToStringBuilder(FactoryProxy.class)
        .add("key", key)
        .add("provider", targetFactory)
        .toString();
  }
}