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Java example source code file (InjectionRequestProcessor.java)

This example Java source code file (InjectionRequestProcessor.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

assertionerror, boolean, configurationexception, errorsexception, immutablelist, initializer, injectionrequestprocessor, injectorimpl, override, set, singlememberinjector, staticinjection, staticinjectionrequest, util, void

The InjectionRequestProcessor.java Java example source code

/**
 * 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.internal;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.inject.ConfigurationException;
import com.google.inject.Stage;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.InjectionRequest;
import com.google.inject.spi.StaticInjectionRequest;

import java.util.List;
import java.util.Set;

/**
 * Handles {@code Binder.requestInjection} and {@code Binder.requestStaticInjection} commands.
 *
 * @author crazybob@google.com (Bob Lee)
 * @author jessewilson@google.com (Jesse Wilson)
 * @author mikeward@google.com (Mike Ward)
 */
final class InjectionRequestProcessor extends AbstractProcessor {

  private final List<StaticInjection> staticInjections = Lists.newArrayList();
  private final Initializer initializer;

  InjectionRequestProcessor(Errors errors, Initializer initializer) {
    super(errors);
    this.initializer = initializer;
  }

  @Override public Boolean visit(StaticInjectionRequest request) {
    staticInjections.add(new StaticInjection(injector, request));
    return true;
  }

  @Override public Boolean visit(InjectionRequest<?> request) {
    Set<InjectionPoint> injectionPoints;
    try {
      injectionPoints = request.getInjectionPoints();
    } catch (ConfigurationException e) {
      errors.merge(e.getErrorMessages());
      injectionPoints = e.getPartialValue();
    }

    initializer.requestInjection(
        injector, request.getInstance(), null, request.getSource(), injectionPoints);
    return true;
  }

  void validate() {
    for (StaticInjection staticInjection : staticInjections) {
      staticInjection.validate();
    }
  }

  void injectMembers() {
    /*
     * TODO: If you request both a parent class and one of its
     * subclasses, the parent class's static members will be
     * injected twice.
     */
    for (StaticInjection staticInjection : staticInjections) {
      staticInjection.injectMembers();
    }
  }

  /** A requested static injection. */
  private class StaticInjection {
    final InjectorImpl injector;
    final Object source;
    final StaticInjectionRequest request;
    ImmutableList<SingleMemberInjector> memberInjectors;

    public StaticInjection(InjectorImpl injector, StaticInjectionRequest request) {
      this.injector = injector;
      this.source = request.getSource();
      this.request = request;
    }

    void validate() {
      Errors errorsForMember = errors.withSource(source);
      Set<InjectionPoint> injectionPoints;
      try {
        injectionPoints = request.getInjectionPoints();
      } catch (ConfigurationException e) {
        errorsForMember.merge(e.getErrorMessages());
        injectionPoints = e.getPartialValue();
      }
      if (injectionPoints != null) {
        memberInjectors = injector.membersInjectorStore.getInjectors(
            injectionPoints, errorsForMember);
      } else {
        memberInjectors = ImmutableList.of();
      }
      
      errors.merge(errorsForMember);
    }

    void injectMembers() {
      try {
        injector.callInContext(new ContextualCallable<Void>() {
          public Void call(InternalContext context) {
            for (SingleMemberInjector memberInjector : memberInjectors) {
              // Run injections if we're not in tool stage (ie, PRODUCTION or DEV),
              // or if we are in tool stage and the injection point is toolable.
              if(injector.options.stage != Stage.TOOL || memberInjector.getInjectionPoint().isToolable()) {
                memberInjector.inject(errors, context, null);
              }
            }
            return null;
          }
        });
      } catch (ErrorsException e) {
        throw new AssertionError();
      }
    }
  }
}

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