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Java example source code file (EncounterImpl.java)

This example Java source code file (EncounterImpl.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

encounterimpl, encounters, errors, immutablelist, immutableset, list, lookups, membersinjector, message, method, object, provider, reflection, typeencounter, util

The EncounterImpl.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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.internal;

import static com.google.common.base.Preconditions.checkState;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.inject.Key;
import com.google.inject.MembersInjector;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.google.inject.matcher.Matcher;
import com.google.inject.matcher.Matchers;
import com.google.inject.spi.InjectionListener;
import com.google.inject.spi.Message;
import com.google.inject.spi.TypeEncounter;

import java.lang.reflect.Method;
import java.util.List;

 * @author jessewilson@google.com (Jesse Wilson)
final class EncounterImpl<T> implements TypeEncounter {

  private final Errors errors;
  private final Lookups lookups;
  private List<MembersInjector membersInjectors; // lazy
  private List<InjectionListener injectionListeners; // lazy
  private List<MethodAspect> aspects; // lazy
  private boolean valid = true;

  EncounterImpl(Errors errors, Lookups lookups) {
    this.errors = errors;
    this.lookups = lookups;

  void invalidate() {
    valid = false;

  ImmutableList<MethodAspect> getAspects() {
    return aspects == null
        ? ImmutableList.<MethodAspect>of()
        : ImmutableList.copyOf(aspects);

  public void bindInterceptor(Matcher<? super Method> methodMatcher,
      org.aopalliance.intercept.MethodInterceptor... interceptors) {
    checkState(valid, "Encounters may not be used after hear() returns.");

    // make sure the applicable aspects is mutable
    if (aspects == null) {
      aspects = Lists.newArrayList();

    aspects.add(new MethodAspect(Matchers.any(), methodMatcher, interceptors));

  ImmutableSet<MembersInjector getMembersInjectors() {
    return membersInjectors == null
        ? ImmutableSet.<MembersInjectorof()
        : ImmutableSet.copyOf(membersInjectors);

  ImmutableSet<InjectionListener getInjectionListeners() {
    return injectionListeners == null
        ? ImmutableSet.<InjectionListenerof()
        : ImmutableSet.copyOf(injectionListeners);

  public void register(MembersInjector<? super T> membersInjector) {
    checkState(valid, "Encounters may not be used after hear() returns.");

    if (membersInjectors == null) {
      membersInjectors = Lists.newArrayList();


  public void register(InjectionListener<? super T> injectionListener) {
    checkState(valid, "Encounters may not be used after hear() returns.");

    if (injectionListeners == null) {
      injectionListeners = Lists.newArrayList();


  public void addError(String message, Object... arguments) {
    checkState(valid, "Encounters may not be used after hear() returns.");
    errors.addMessage(message, arguments);

  public void addError(Throwable t) {
    checkState(valid, "Encounters may not be used after hear() returns.");
    errors.errorInUserCode(t, "An exception was caught and reported. Message: %s", t.getMessage());

  public void addError(Message message) {
    checkState(valid, "Encounters may not be used after hear() returns.");

  public <T> Provider getProvider(Key key) {
    checkState(valid, "Encounters may not be used after hear() returns.");
    return lookups.getProvider(key);

  public <T> Provider getProvider(Class type) {
    return getProvider(Key.get(type));

  public <T> MembersInjector getMembersInjector(TypeLiteral typeLiteral) {
    checkState(valid, "Encounters may not be used after hear() returns.");
    return lookups.getMembersInjector(typeLiteral);

  public <T> MembersInjector getMembersInjector(Class type) {
    return getMembersInjector(TypeLiteral.get(type));

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