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Java example source code file (MembersInjectorStore.java)

This example Java source code file (MembersInjectorStore.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

configurationexception, encounterimpl, errors, errorsexception, failablecache, field, immutablelist, injectionpoint, membersinjectorimpl, membersinjectorstore, reflection, runtimeexception, set, suppresswarnings, typelistenerbinding, util

The MembersInjectorStore.java Java example source code

/**
 * Copyright (C) 2009 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.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.inject.ConfigurationException;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.TypeListener;
import com.google.inject.spi.TypeListenerBinding;

import java.lang.reflect.Field;
import java.util.List;
import java.util.Set;

/**
 * Members injectors by type.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 */
final class MembersInjectorStore {
  private final InjectorImpl injector;
  private final ImmutableList<TypeListenerBinding> typeListenerBindings;

  private final FailableCache<TypeLiteral> cache
      = new FailableCache<TypeLiteral>() {
    @Override protected MembersInjectorImpl<?> create(TypeLiteral type, Errors errors)
        throws ErrorsException {
      return createWithListeners(type, errors);
    }
  };

  MembersInjectorStore(InjectorImpl injector,
      List<TypeListenerBinding> typeListenerBindings) {
    this.injector = injector;
    this.typeListenerBindings = ImmutableList.copyOf(typeListenerBindings);
  }

  /**
   * Returns true if any type listeners are installed. Other code may take shortcuts when there
   * aren't any type listeners.
   */
  public boolean hasTypeListeners() {
    return !typeListenerBindings.isEmpty();
  }

  /**
   * Returns a new complete members injector with injection listeners registered.
   */
  @SuppressWarnings("unchecked") // the MembersInjector type always agrees with the passed type
  public <T> MembersInjectorImpl get(TypeLiteral key, Errors errors) throws ErrorsException {
    return (MembersInjectorImpl<T>) cache.get(key, errors);
  }

  /**
   * Purges a type literal from the cache. Use this only if the type is not actually valid for
   * binding and needs to be purged. (See issue 319 and
   * ImplicitBindingTest#testCircularJitBindingsLeaveNoResidue and
   * #testInstancesRequestingProvidersForThemselvesWithChildInjectors for examples of when this is
   * necessary.)
   * 
   * Returns true if the type was stored in the cache, false otherwise.
   */
  boolean remove(TypeLiteral<?> type) {
    return cache.remove(type);
  }

  /**
   * Creates a new members injector and attaches both injection listeners and method aspects.
   */
  private <T> MembersInjectorImpl createWithListeners(TypeLiteral type, Errors errors)
      throws ErrorsException {
    int numErrorsBefore = errors.size();

    Set<InjectionPoint> injectionPoints;
    try {
      injectionPoints = InjectionPoint.forInstanceMethodsAndFields(type);
    } catch (ConfigurationException e) {
      errors.merge(e.getErrorMessages());
      injectionPoints = e.getPartialValue();
    }
    ImmutableList<SingleMemberInjector> injectors = getInjectors(injectionPoints, errors);
    errors.throwIfNewErrors(numErrorsBefore);

    EncounterImpl<T> encounter = new EncounterImpl(errors, injector.lookups);
    Set<TypeListener> alreadySeenListeners = Sets.newHashSet();
    for (TypeListenerBinding binding : typeListenerBindings) {
      TypeListener typeListener = binding.getListener();
      if (!alreadySeenListeners.contains(typeListener) && binding.getTypeMatcher().matches(type)) {
        alreadySeenListeners.add(typeListener);
        try {
          typeListener.hear(type, encounter);
        } catch (RuntimeException e) {
          errors.errorNotifyingTypeListener(binding, type, e);
        }
      }
    }
    encounter.invalidate();
    errors.throwIfNewErrors(numErrorsBefore);

    return new MembersInjectorImpl<T>(injector, type, encounter, injectors);
  }

  /**
   * Returns the injectors for the specified injection points.
   */
  ImmutableList<SingleMemberInjector> getInjectors(
      Set<InjectionPoint> injectionPoints, Errors errors) {
    List<SingleMemberInjector> injectors = Lists.newArrayList();
    for (InjectionPoint injectionPoint : injectionPoints) {
      try {
        Errors errorsForMember = injectionPoint.isOptional()
            ? new Errors(injectionPoint)
            : errors.withSource(injectionPoint);
        SingleMemberInjector injector = injectionPoint.getMember() instanceof Field
            ? new SingleFieldInjector(this.injector, injectionPoint, errorsForMember)
            : new SingleMethodInjector(this.injector, injectionPoint, errorsForMember);
        injectors.add(injector);
      } catch (ErrorsException ignoredForNow) {
        // ignored for now
      }
    }
    return ImmutableList.copyOf(injectors);
  }
}

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