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Java example source code file (InheritingState.java)

This example Java source code file (InheritingState.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

annotation, bindingimpl, bindingimpls, immutablelist, inheritingstate, list, map, object, scopebinding, state, string, typeconverterbinding, typeliteral, util, weakkeyset

The InheritingState.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,
 * 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.checkNotNull;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.inject.Binding;
import com.google.inject.Key;
import com.google.inject.Scope;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.ModuleAnnotatedMethodScannerBinding;
import com.google.inject.spi.ProvisionListenerBinding;
import com.google.inject.spi.ScopeBinding;
import com.google.inject.spi.TypeConverterBinding;
import com.google.inject.spi.TypeListenerBinding;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

 * @author jessewilson@google.com (Jesse Wilson)
final class InheritingState implements State {

  private final State parent;

  // Must be a linked hashmap in order to preserve order of bindings in Modules.
  private final Map<Key> explicitBindingsMutable = Maps.newLinkedHashMap();
  private final Map<Key> explicitBindings
      = Collections.unmodifiableMap(explicitBindingsMutable);
  private final Map<Class scopes = Maps.newHashMap();
  private final List<TypeConverterBinding> converters = Lists.newArrayList();
  private final List<MethodAspect> methodAspects = Lists.newArrayList();
  private final List<TypeListenerBinding> typeListenerBindings = Lists.newArrayList();
  private final List<ProvisionListenerBinding> provisionListenerBindings = Lists.newArrayList();
  private final List<ModuleAnnotatedMethodScannerBinding> scannerBindings = Lists.newArrayList();
  private final WeakKeySet blacklistedKeys;
  private final Object lock;

  InheritingState(State parent) {
    this.parent = checkNotNull(parent, "parent");
    this.lock = (parent == State.NONE) ? this : parent.lock();
    this.blacklistedKeys = new WeakKeySet(lock);

  public State parent() {
    return parent;

  @SuppressWarnings("unchecked") // we only put in BindingImpls that match their key types
  public <T> BindingImpl getExplicitBinding(Key key) {
    Binding<?> binding = explicitBindings.get(key);
    return binding != null ? (BindingImpl<T>) binding : parent.getExplicitBinding(key);

  public Map<Key> getExplicitBindingsThisLevel() {
    return explicitBindings;

  public void putBinding(Key<?> key, BindingImpl binding) {
    explicitBindingsMutable.put(key, binding);

  public ScopeBinding getScopeBinding(Class<? extends Annotation> annotationType) {
    ScopeBinding scopeBinding = scopes.get(annotationType);
    return scopeBinding != null ? scopeBinding : parent.getScopeBinding(annotationType);

  public void putScopeBinding(Class<? extends Annotation> annotationType, ScopeBinding scope) {
    scopes.put(annotationType, scope);

  public Iterable<TypeConverterBinding> getConvertersThisLevel() {
    return converters;

  public void addConverter(TypeConverterBinding typeConverterBinding) {

  public TypeConverterBinding getConverter(
      String stringValue, TypeLiteral<?> type, Errors errors, Object source) {
    TypeConverterBinding matchingConverter = null;
    for (State s = this; s != State.NONE; s = s.parent()) {
      for (TypeConverterBinding converter : s.getConvertersThisLevel()) {
        if (converter.getTypeMatcher().matches(type)) {
          if (matchingConverter != null) {
            errors.ambiguousTypeConversion(stringValue, source, type, matchingConverter, converter);
          matchingConverter = converter;
    return matchingConverter;

  public void addMethodAspect(MethodAspect methodAspect) {

  public ImmutableList<MethodAspect> getMethodAspects() {
    return new ImmutableList.Builder<MethodAspect>()

  public void addTypeListener(TypeListenerBinding listenerBinding) {

  public List<TypeListenerBinding> getTypeListenerBindings() {
    List<TypeListenerBinding> parentBindings = parent.getTypeListenerBindings();
    List<TypeListenerBinding> result =
        Lists.newArrayListWithCapacity(parentBindings.size() + typeListenerBindings.size());
    return result;
  public void addProvisionListener(ProvisionListenerBinding listenerBinding) {

  public List<ProvisionListenerBinding> getProvisionListenerBindings() {
    List<ProvisionListenerBinding> parentBindings = parent.getProvisionListenerBindings();
    List<ProvisionListenerBinding> result =
        Lists.newArrayListWithCapacity(parentBindings.size() + provisionListenerBindings.size());
    return result;

  public void addScanner(ModuleAnnotatedMethodScannerBinding scanner) {

  public List<ModuleAnnotatedMethodScannerBinding> getScannerBindings() {
    List<ModuleAnnotatedMethodScannerBinding> parentBindings = parent.getScannerBindings();
    List<ModuleAnnotatedMethodScannerBinding> result =
        Lists.newArrayListWithCapacity(parentBindings.size() + scannerBindings.size());
    return result;

  public void blacklist(Key<?> key, State state, Object source) {
    parent.blacklist(key, state, source);
    blacklistedKeys.add(key, state, source);

  public boolean isBlacklisted(Key<?> key) {
    return blacklistedKeys.contains(key);
  public Set<Object> getSourcesForBlacklistedKey(Key key) {
    return blacklistedKeys.getSources(key);

  public Object lock() {
    return lock;

  public Map<Class getScopes() {
    ImmutableMap.Builder<Class builder = ImmutableMap.builder();
    for (Map.Entry<Class entry : scopes.entrySet()) {
      builder.put(entry.getKey(), entry.getValue().getScope());
    return builder.build();

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