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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.spi.Dependency;
import org.elasticsearch.util.inject.spi.InjectionPoint;
import java.lang.reflect.Field;

/**
 * Sets an injectable field.
 */
class SingleFieldInjector implements SingleMemberInjector {
  final Field field;
  final InjectionPoint injectionPoint;
  final Dependency dependency;
  final InternalFactory factory;

  public SingleFieldInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)
      throws ErrorsException {
    this.injectionPoint = injectionPoint;
    this.field = (Field) injectionPoint.getMember();
    this.dependency = injectionPoint.getDependencies().get(0);

    // Ewwwww...
    field.setAccessible(true);
    factory = injector.getInternalFactory(dependency.getKey(), errors);
  }

  public InjectionPoint getInjectionPoint() {
    return injectionPoint;
  }

  public void inject(Errors errors, InternalContext context, Object o) {
    errors = errors.withSource(dependency);

    context.setDependency(dependency);
    try {
      Object value = factory.get(errors, context, dependency);
      field.set(o, value);
    } catch (ErrorsException e) {
      errors.withSource(injectionPoint).merge(e.getErrors());
    } catch (IllegalAccessException e) {
      throw new AssertionError(e); // a security manager is blocking us, we're hosed
    } finally {
      context.setDependency(null);
    }
  }
}