com.google.inject.internal.RealMapBinder Maven / Gradle / Ivy
package com.google.inject.internal;
import static com.google.inject.internal.Element.Type.MAPBINDER;
import static com.google.inject.internal.Errors.checkConfiguration;
import static com.google.inject.internal.Errors.checkNotNull;
import static com.google.inject.internal.RealMultibinder.setOf;
import static com.google.inject.util.Types.newParameterizedType;
import static com.google.inject.util.Types.newParameterizedTypeWithOwner;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import com.google.inject.Binder;
import com.google.inject.Binding;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.google.inject.binder.LinkedBindingBuilder;
import com.google.inject.internal.InternalProviderInstanceBindingImpl.InitializationTiming;
import com.google.inject.multibindings.MapBinderBinding;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.multibindings.MultibindingsTargetVisitor;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.Element;
import com.google.inject.spi.ProviderInstanceBinding;
import com.google.inject.spi.ProviderWithExtensionVisitor;
import com.google.inject.util.Types;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* The actual mapbinder plays several roles:
*
* As a MapBinder, it acts as a factory for LinkedBindingBuilders for each of the map's values.
* It delegates to a {@link Multibinder} of entries (keys to value providers).
*
*
As a Module, it installs the binding to the map itself, as well as to a corresponding map
* whose values are providers.
*
*
As a module, this implements equals() and hashcode() in order to trick Guice into executing
* its configure() method only once. That makes it so that multiple mapbinders can be created for
* the same target map, but only one is bound. Since the list of bindings is retrieved from the
* injector itself (and not the mapbinder), each mapbinder has access to all contributions from all
* equivalent mapbinders.
*
*
Rather than binding a single Map.Entry<K, V>, the map binder binds keys and values
* independently. This allows the values to be properly scoped.
*/
public final class RealMapBinder implements Module {
/**
* Returns a new mapbinder that collects entries of {@code keyType}/{@code valueType} in a {@link
* Map} that is itself bound with no binding annotation.
*/
public static RealMapBinder newMapRealBinder(
Binder binder, TypeLiteral keyType, TypeLiteral valueType) {
binder = binder.skipSources(RealMapBinder.class);
return newRealMapBinder(
binder,
keyType,
valueType,
Key.get(mapOf(keyType, valueType)),
RealMultibinder.newRealSetBinder(binder, Key.get(entryOfProviderOf(keyType, valueType))));
}
/**
* Returns a new mapbinder that collects entries of {@code keyType}/{@code valueType} in a {@link
* Map} that is itself bound with {@code annotation}.
*/
public static RealMapBinder newRealMapBinder(
Binder binder, TypeLiteral keyType, TypeLiteral valueType, Annotation annotation) {
binder = binder.skipSources(RealMapBinder.class);
return newRealMapBinder(
binder,
keyType,
valueType,
Key.get(mapOf(keyType, valueType), annotation),
RealMultibinder.newRealSetBinder(
binder, Key.get(entryOfProviderOf(keyType, valueType), annotation)));
}
/**
* Returns a new mapbinder that collects entries of {@code keyType}/{@code valueType} in a {@link
* Map} that is itself bound with {@code annotationType}.
*/
public static RealMapBinder newRealMapBinder(
Binder binder,
TypeLiteral keyType,
TypeLiteral valueType,
Class annotationType) {
binder = binder.skipSources(RealMapBinder.class);
return newRealMapBinder(
binder,
keyType,
valueType,
Key.get(mapOf(keyType, valueType), annotationType),
RealMultibinder.newRealSetBinder(
binder, Key.get(entryOfProviderOf(keyType, valueType), annotationType)));
}
@SuppressWarnings("unchecked") // a map of is safely a Map
static TypeLiteral> mapOf(TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>)
TypeLiteral.get(Types.mapOf(keyType.getType(), valueType.getType()));
}
@SuppressWarnings("unchecked") // a provider map is safely a Map>
static TypeLiteral>> mapOfProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>)
TypeLiteral.get(Types.mapOf(keyType.getType(), Types.providerOf(valueType.getType())));
}
// provider map is safely a Map>>
@SuppressWarnings("unchecked")
static TypeLiteral>> mapOfJavaxProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>)
TypeLiteral.get(
Types.mapOf(
keyType.getType(),
newParameterizedType(javax.inject.Provider.class, valueType.getType())));
}
@SuppressWarnings("unchecked") // a provider map > is safely a Map>>
static TypeLiteral>>> mapOfSetOfProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>>)
TypeLiteral.get(
Types.mapOf(keyType.getType(), Types.setOf(Types.providerOf(valueType.getType()))));
}
@SuppressWarnings("unchecked") // a provider map > is safely a Map>>
static TypeLiteral>>> mapOfSetOfJavaxProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>>)
TypeLiteral.get(
Types.mapOf(
keyType.getType(), Types.setOf(Types.javaxProviderOf(valueType.getType()))));
}
@SuppressWarnings("unchecked") // a provider map > is safely a Map>>
static TypeLiteral>>> mapOfCollectionOfProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>>)
TypeLiteral.get(
Types.mapOf(
keyType.getType(), Types.collectionOf(Types.providerOf(valueType.getType()))));
}
@SuppressWarnings("unchecked") // a provider map > is safely a Map>>
static
TypeLiteral>>> mapOfCollectionOfJavaxProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>>)
TypeLiteral.get(
Types.mapOf(
keyType.getType(), Types.collectionOf(Types.javaxProviderOf(valueType.getType()))));
}
@SuppressWarnings("unchecked") // a provider entry is safely a Map.Entry>
static TypeLiteral>> entryOfProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>)
TypeLiteral.get(
newParameterizedTypeWithOwner(
Map.class,
Map.Entry.class,
keyType.getType(),
Types.providerOf(valueType.getType())));
}
@SuppressWarnings("unchecked") // a provider entry is safely a Map.Entry>
static TypeLiteral>> entryOfJavaxProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>)
TypeLiteral.get(
newParameterizedTypeWithOwner(
Map.class,
Map.Entry.class,
keyType.getType(),
Types.javaxProviderOf(valueType.getType())));
}
@SuppressWarnings("unchecked") // a provider entry is safely a Map.Entry>
static
TypeLiteral>>> setOfEntryOfJavaxProviderOf(
TypeLiteral keyType, TypeLiteral valueType) {
return (TypeLiteral>>>)
TypeLiteral.get(Types.setOf(entryOfJavaxProviderOf(keyType, valueType).getType()));
}
/** Given a Key will return a Key> */
@SuppressWarnings("unchecked")
private static Key> getKeyOfProvider(Key valueKey) {
return (Key>)
valueKey.ofType(Types.providerOf(valueKey.getTypeLiteral().getType()));
}
// Note: We use valueTypeAndAnnotation effectively as a Pair
// since it's an easy way to group a type and an optional annotation type or instance.
static RealMapBinder newRealMapBinder(
Binder binder, TypeLiteral keyType, Key valueTypeAndAnnotation) {
binder = binder.skipSources(RealMapBinder.class);
TypeLiteral valueType = valueTypeAndAnnotation.getTypeLiteral();
return newRealMapBinder(
binder,
keyType,
valueType,
valueTypeAndAnnotation.ofType(mapOf(keyType, valueType)),
RealMultibinder.newRealSetBinder(
binder, valueTypeAndAnnotation.ofType(entryOfProviderOf(keyType, valueType))));
}
private static RealMapBinder newRealMapBinder(
Binder binder,
TypeLiteral keyType,
TypeLiteral valueType,
Key> mapKey,
RealMultibinder>> entrySetBinder) {
RealMapBinder mapBinder =
new RealMapBinder(binder, keyType, valueType, mapKey, entrySetBinder);
binder.install(mapBinder);
return mapBinder;
}
// Until the injector initializes us, we don't know what our dependencies are,
// so initialize to the whole Injector.
private static final ImmutableSet> MODULE_DEPENDENCIES =
ImmutableSet.>of(Dependency.get(Key.get(Injector.class)));
private final BindingSelection bindingSelection;
private final Binder binder;
private final RealMultibinder>> entrySetBinder;
private RealMapBinder(
Binder binder,
TypeLiteral keyType,
TypeLiteral valueType,
Key> mapKey,
RealMultibinder>> entrySetBinder) {
this.bindingSelection = new BindingSelection<>(keyType, valueType, mapKey, entrySetBinder);
this.binder = binder;
this.entrySetBinder = entrySetBinder;
}
public void permitDuplicates() {
checkConfiguration(!bindingSelection.isInitialized(), "MapBinder was already initialized");
entrySetBinder.permitDuplicates();
binder.install(new MultimapBinder(bindingSelection));
}
/** Adds a binding to the map for the given key. */
Key getKeyForNewValue(K key) {
checkNotNull(key, "key");
checkConfiguration(!bindingSelection.isInitialized(), "MapBinder was already initialized");
RealMultibinder>> entrySetBinder =
bindingSelection.getEntrySetBinder();
Key valueKey =
Key.get(
bindingSelection.getValueType(),
new RealElement(
entrySetBinder.getSetName(), MAPBINDER, bindingSelection.getKeyType().toString()));
entrySetBinder.addBinding().toProvider(new ProviderMapEntry(key, valueKey));
return valueKey;
}
/**
* This creates two bindings. One for the {@code Map.Entry>} and another for {@code
* V}.
*/
public LinkedBindingBuilder addBinding(K key) {
return binder.bind(getKeyForNewValue(key));
}
@Override
public void configure(Binder binder) {
checkConfiguration(!bindingSelection.isInitialized(), "MapBinder was already initialized");
// Binds a Map>
RealProviderMapProvider providerMapProvider =
new RealProviderMapProvider(bindingSelection);
binder.bind(bindingSelection.getProviderMapKey()).toProvider(providerMapProvider);
// The map this exposes is internally an ImmutableMap, so it's OK to massage
// the guice Provider to javax Provider in the value (since Guice provider
// implements javax Provider).
@SuppressWarnings({"unchecked", "rawtypes"})
Provider>> javaxProviderMapProvider =
(Provider) providerMapProvider;
binder.bind(bindingSelection.getJavaxProviderMapKey()).toProvider(javaxProviderMapProvider);
RealMapProvider mapProvider = new RealMapProvider<>(bindingSelection);
binder.bind(bindingSelection.getMapKey()).toProvider(mapProvider);
// The Map.Entries are all ProviderMapEntry instances which do not allow setValue, so it is
// safe to massage the return type like this
@SuppressWarnings({"unchecked", "rawtypes"})
Key>>> massagedEntrySetProviderKey =
(Key) bindingSelection.getEntrySetBinder().getSetKey();
binder.bind(bindingSelection.getEntrySetJavaxProviderKey()).to(massagedEntrySetProviderKey);
}
@Override
public boolean equals(Object o) {
return o instanceof RealMapBinder
&& ((RealMapBinder) o).bindingSelection.equals(bindingSelection);
}
@Override
public int hashCode() {
return bindingSelection.hashCode();
}
/**
* The BindingSelection contains some of the core state and logic for the MapBinder.
*
* It lazily computes the value for keys for various permutations of Maps that are provided by
* this module. It also builds up maps from {@code K} to {@code Binding}, which is used by all
* of the internal factories to actually provide the desired maps.
*
* During initialization time there is only one BindingSelection. It is possible that multiple
* different BindingSelections are constructed. Specifically, in the case of two different modules
* each adding bindings to the same MapBinder. If that happens, we define the BindingSelection
* held by the {@link RealMapProvider} to be the authoritative one. The logic for this exists in
* {@link RealMultimapBinderProviderWithDependencies}. This is done to avoid confusion because the
* BindingSelection contains mutable state.
*/
private static final class BindingSelection {
private enum InitializationState {
UNINITIALIZED,
INITIALIZED,
HAS_ERRORS;
}
private final TypeLiteral keyType;
private final TypeLiteral valueType;
private final Key> mapKey;
// Lazily computed
private Key>> javaxProviderMapKey;
private Key>> providerMapKey;
private Key>> multimapKey;
private Key>>> providerSetMultimapKey;
private Key>>> javaxProviderSetMultimapKey;
private Key>>> providerCollectionMultimapKey;
private Key>>> javaxProviderCollectionMultimapKey;
private Key>>> entrySetJavaxProviderKey;
private final RealMultibinder>> entrySetBinder;
private InitializationState initializationState;
/**
* These are built during initialization and used by all factories to actually provide the
* relevant maps. These contain all of the necessary information about the map binder.
*/
private ImmutableMap> mapBindings;
private ImmutableMap>> multimapBindings;
private ImmutableList>> entries;
/**
* Indicates if this Map permits duplicates. It is initialized during initialization by querying
* the injector. This is done because multiple different modules can contribute to a MapBinder,
* and any one could set permitDuplicates.
*/
private boolean permitsDuplicates;
private BindingSelection(
TypeLiteral keyType,
TypeLiteral valueType,
Key> mapKey,
RealMultibinder>> entrySetBinder) {
this.keyType = keyType;
this.valueType = valueType;
this.mapKey = mapKey;
this.entrySetBinder = entrySetBinder;
this.initializationState = InitializationState.UNINITIALIZED;
}
/**
* Will initialize internal data structures.
*
* @return {@code true} if initialization was successful, {@code false} if there were errors
*/
private boolean tryInitialize(InjectorImpl injector, Errors errors) {
// Every one of our providers will call this method, so only execute the logic once.
if (initializationState != InitializationState.UNINITIALIZED) {
return initializationState != InitializationState.HAS_ERRORS;
}
// Multiple different modules can all contribute to the same MapBinder, and if any
// one of them permits duplicates, then the map binder as a whole will permit duplicates.
// Since permitDuplicates() may not have been called on this instance, we need to go
// to the injector to see if permitDuplicates was set.
permitsDuplicates = entrySetBinder.permitsDuplicates(injector);
// We now build the Map>> from the entrySetBinder.
// The entrySetBinder contains all of the ProviderMapEntrys, and once
// we have those, it's easy to iterate through them to organize them by K.
Map>> bindingMultimapMutable =
new LinkedHashMap>>();
Map> bindingMapMutable = new LinkedHashMap<>();
Multimap index = HashMultimap.create();
Indexer indexer = new Indexer(injector);
Multimap> duplicates = null;
ImmutableList.Builder>> entriesBuilder = ImmutableList.builder();
// We get all of the Bindings that were put into the entrySetBinder
for (Binding>> binding :
injector.findBindingsByType(entrySetBinder.getElementTypeLiteral())) {
if (entrySetBinder.containsElement(binding)) {
// Protected by findBindingByType() and the fact that all providers are added by us
// in addBinding(). It would theoretically be possible for someone to directly
// add their own binding to the entrySetBinder, but they shouldn't do that.
@SuppressWarnings({"unchecked", "rawtypes"})
ProviderInstanceBinding> entryBinding =
(ProviderInstanceBinding) binding;
// We added all these bindings initially, so we know they are ProviderMapEntrys
@SuppressWarnings({"unchecked", "rawtypes"})
ProviderMapEntry entry = (ProviderMapEntry) entryBinding.getUserSuppliedProvider();
K key = entry.getKey();
Key valueKey = entry.getValueKey();
Binding valueBinding = injector.getExistingBinding(valueKey);
// Use the indexer to de-dupe user bindings. This is needed because of the
// uniqueId in RealElement. The uniqueId intentionally circumvents the regular
// Guice deduplication, so we need to re-implement our own here, ignoring
// uniqueId.
if (index.put(key, valueBinding.acceptTargetVisitor(indexer))) {
entriesBuilder.add(Maps.immutableEntry(key, valueBinding));
Binding previous = bindingMapMutable.put(key, valueBinding);
// Check if this is a duplicate binding
if (previous != null && !permitsDuplicates) {
if (duplicates == null) {
// This is linked for both keys and values to maintain order
duplicates = LinkedHashMultimap.create();
}
// We add both the previous and the current value to the duplicates map.
// This is because if there are three duplicates, we will only execute this code
// for the second and third, but we want all three values to display a helpful
// error message. We rely on the multimap to dedupe repeated values.
duplicates.put(key, previous);
duplicates.put(key, valueBinding);
}
// Don't do extra work unless we need to
if (permitsDuplicates) {
// Create a set builder for this key if it's the first time we've seen it
if (!bindingMultimapMutable.containsKey(key)) {
bindingMultimapMutable.put(key, ImmutableSet.>builder());
}
// Add the Binding
bindingMultimapMutable.get(key).add(valueBinding);
}
}
}
}
// It is safe to check if duplicates is non-null because if duplicates are allowed,
// we don't build up this data structure
if (duplicates != null) {
initializationState = InitializationState.HAS_ERRORS;
reportDuplicateKeysError(duplicates, errors);
return false;
}
// Build all of the ImmutableSet.Builders,
// transforming from Map>> to
// ImmutableMap>>
ImmutableMap.Builder>> bindingsMultimapBuilder = ImmutableMap.builder();
for (Map.Entry>> entry :
bindingMultimapMutable.entrySet()) {
bindingsMultimapBuilder.put(entry.getKey(), entry.getValue().build());
}
mapBindings = ImmutableMap.copyOf(bindingMapMutable);
multimapBindings = bindingsMultimapBuilder.build();
entries = entriesBuilder.build();
initializationState = InitializationState.INITIALIZED;
return true;
}
private static void reportDuplicateKeysError(
Multimap> duplicates, Errors errors) {
StringBuilder sb = new StringBuilder("Map injection failed due to duplicated key ");
boolean first = true;
for (Map.Entry>> entry : duplicates.asMap().entrySet()) {
K dupKey = entry.getKey();
if (first) {
first = false;
sb.append("\"" + dupKey + "\", from bindings:\n");
} else {
sb.append("\n and key: \"" + dupKey + "\", from bindings:\n");
}
for (Binding dup : entry.getValue()) {
sb.append("\t at " + Errors.convert(dup.getSource()) + "\n");
}
}
// TODO(user): Add a different error for every duplicated key
errors.addMessage(sb.toString());
}
private boolean containsElement(Element element) {
if (entrySetBinder.containsElement(element)) {
return true;
}
Key key;
if (element instanceof Binding) {
key = ((Binding) element).getKey();
} else {
return false; // cannot match;
}
return key.equals(getMapKey())
|| key.equals(getProviderMapKey())
|| key.equals(getJavaxProviderMapKey())
|| key.equals(getMultimapKey())
|| key.equals(getProviderSetMultimapKey())
|| key.equals(getJavaxProviderSetMultimapKey())
|| key.equals(getProviderCollectionMultimapKey())
|| key.equals(getJavaxProviderCollectionMultimapKey())
|| key.equals(entrySetBinder.getSetKey())
|| key.equals(getEntrySetJavaxProviderKey())
|| matchesValueKey(key);
}
/** Returns true if the key indicates this is a value in the map. */
private boolean matchesValueKey(Key key) {
return key.getAnnotation() instanceof RealElement
&& ((RealElement) key.getAnnotation()).setName().equals(entrySetBinder.getSetName())
&& ((RealElement) key.getAnnotation()).type() == MAPBINDER
&& ((RealElement) key.getAnnotation()).keyType().equals(keyType.toString())
&& key.getTypeLiteral().equals(valueType);
}
private Key>> getProviderMapKey() {
Key>> local = providerMapKey;
if (local == null) {
local = providerMapKey = mapKey.ofType(mapOfProviderOf(keyType, valueType));
}
return local;
}
private Key>> getJavaxProviderMapKey() {
Key>> local = javaxProviderMapKey;
if (local == null) {
local = javaxProviderMapKey = mapKey.ofType(mapOfJavaxProviderOf(keyType, valueType));
}
return local;
}
private Key>> getMultimapKey() {
Key>> local = multimapKey;
if (local == null) {
local = multimapKey = mapKey.ofType(mapOf(keyType, setOf(valueType)));
}
return local;
}
private Key>>> getProviderSetMultimapKey() {
Key>>> local = providerSetMultimapKey;
if (local == null) {
local = providerSetMultimapKey = mapKey.ofType(mapOfSetOfProviderOf(keyType, valueType));
}
return local;
}
private Key>>> getJavaxProviderSetMultimapKey() {
Key>>> local = javaxProviderSetMultimapKey;
if (local == null) {
local =
javaxProviderSetMultimapKey =
mapKey.ofType(mapOfSetOfJavaxProviderOf(keyType, valueType));
}
return local;
}
private Key>>> getProviderCollectionMultimapKey() {
Key>>> local = providerCollectionMultimapKey;
if (local == null) {
local =
providerCollectionMultimapKey =
mapKey.ofType(mapOfCollectionOfProviderOf(keyType, valueType));
}
return local;
}
private Key>>>
getJavaxProviderCollectionMultimapKey() {
Key>>> local = javaxProviderCollectionMultimapKey;
if (local == null) {
local =
javaxProviderCollectionMultimapKey =
mapKey.ofType(mapOfCollectionOfJavaxProviderOf(keyType, valueType));
}
return local;
}
private Key>>> getEntrySetJavaxProviderKey() {
Key>>> local = entrySetJavaxProviderKey;
if (local == null) {
local =
entrySetJavaxProviderKey =
mapKey.ofType(setOfEntryOfJavaxProviderOf(keyType, valueType));
}
return local;
}
private ImmutableMap> getMapBindings() {
checkConfiguration(isInitialized(), "MapBinder has not yet been initialized");
return mapBindings;
}
private ImmutableMap>> getMultimapBindings() {
checkConfiguration(isInitialized(), "MapBinder has not yet been initialized");
return multimapBindings;
}
private ImmutableList>> getEntries() {
checkConfiguration(isInitialized(), "MapBinder has not yet been initialized");
return entries;
}
private boolean isInitialized() {
return initializationState == InitializationState.INITIALIZED;
}
private TypeLiteral getKeyType() {
return keyType;
}
private TypeLiteral getValueType() {
return valueType;
}
private Key> getMapKey() {
return mapKey;
}
private RealMultibinder>> getEntrySetBinder() {
return entrySetBinder;
}
private boolean permitsDuplicates() {
if (isInitialized()) {
return permitsDuplicates;
} else {
throw new UnsupportedOperationException(
"permitsDuplicates() not supported for module bindings");
}
}
@Override
public boolean equals(Object o) {
return o instanceof BindingSelection && ((BindingSelection) o).mapKey.equals(mapKey);
}
@Override
public int hashCode() {
return mapKey.hashCode();
}
}
private static final class RealProviderMapProvider
extends RealMapBinderProviderWithDependencies>> {
private Map> mapOfProviders;
private Set> dependencies = RealMapBinder.MODULE_DEPENDENCIES;
private RealProviderMapProvider(BindingSelection bindingSelection) {
super(bindingSelection);
}
@Override
public Set> getDependencies() {
return dependencies;
}
@Override
protected void doInitialize(InjectorImpl injector, Errors errors) {
ImmutableMap.Builder> mapOfProvidersBuilder = ImmutableMap.builder();
ImmutableSet.Builder> dependenciesBuilder = ImmutableSet.builder();
for (Map.Entry> entry : bindingSelection.getMapBindings().entrySet()) {
mapOfProvidersBuilder.put(entry.getKey(), entry.getValue().getProvider());
dependenciesBuilder.add(Dependency.get(getKeyOfProvider(entry.getValue().getKey())));
}
mapOfProviders = mapOfProvidersBuilder.build();
dependencies = dependenciesBuilder.build();
}
@Override
protected Map> doProvision(InternalContext context, Dependency dependency) {
return mapOfProviders;
}
}
private static final class RealMapProvider
extends RealMapBinderProviderWithDependencies>
implements ProviderWithExtensionVisitor>, MapBinderBinding> {
private Set> dependencies = RealMapBinder.MODULE_DEPENDENCIES;
/**
* An array of all the injectors.
*
* This is parallel to array of keys below
*/
private SingleParameterInjector[] injectors;
private K[] keys;
private RealMapProvider(BindingSelection bindingSelection) {
super(bindingSelection);
}
private BindingSelection getBindingSelection() {
return bindingSelection;
}
@Override
protected void doInitialize(InjectorImpl injector, Errors errors) throws ErrorsException {
@SuppressWarnings("unchecked")
K[] keysArray = (K[]) new Object[bindingSelection.getMapBindings().size()];
keys = keysArray;
ImmutableSet.Builder> dependenciesBuilder = ImmutableSet.builder();
int i = 0;
for (Map.Entry> entry : bindingSelection.getMapBindings().entrySet()) {
dependenciesBuilder.add(Dependency.get(entry.getValue().getKey()));
keys[i] = entry.getKey();
i++;
}
ImmutableSet> localDependencies = dependenciesBuilder.build();
dependencies = localDependencies;
List> dependenciesList = localDependencies.asList();
// We know the type because we built up our own sets of dependencies, it's just
// that the interface uses a "?" generic
@SuppressWarnings("unchecked")
SingleParameterInjector[] typedInjectors =
(SingleParameterInjector[]) injector.getParametersInjectors(dependenciesList, errors);
injectors = typedInjectors;
}
@Override
protected Map doProvision(InternalContext context, Dependency dependency)
throws InternalProvisionException {
SingleParameterInjector[] localInjectors = injectors;
if (localInjectors == null) {
// if injectors == null, then we have no bindings so return the empty map.
return ImmutableMap.of();
}
ImmutableMap.Builder resultBuilder = ImmutableMap.builder();
K[] localKeys = keys;
for (int i = 0; i < localInjectors.length; i++) {
SingleParameterInjector injector = localInjectors[i];
K key = localKeys[i];
V value = injector.inject(context);
if (value == null) {
throw createNullValueException(key, bindingSelection.getMapBindings().get(key));
}
resultBuilder.put(key, value);
}
return resultBuilder.build();
}
@Override
public Set> getDependencies() {
return dependencies;
}
@Override
@SuppressWarnings("unchecked")
public W acceptExtensionVisitor(
BindingTargetVisitor visitor, ProviderInstanceBinding binding) {
if (visitor instanceof MultibindingsTargetVisitor) {
return ((MultibindingsTargetVisitor, W>) visitor).visit(this);
} else {
return visitor.visit(binding);
}
}
@Override
public Key> getMapKey() {
return bindingSelection.getMapKey();
}
@Override
public TypeLiteral getKeyTypeLiteral() {
return bindingSelection.getKeyType();
}
@Override
public TypeLiteral getValueTypeLiteral() {
return bindingSelection.getValueType();
}
@Override
@SuppressWarnings("unchecked")
public List>> getEntries() {
if (bindingSelection.isInitialized()) {
return (List>>) (List) bindingSelection.getEntries();
} else {
throw new UnsupportedOperationException("getEntries() not supported for module bindings");
}
}
@Override
public List>> getEntries(Iterable elements) {
// Iterate over the elements, building up the below maps
// This is a preprocessing step allowing us to only iterate over elements
// once and have O(n) runtime
ImmutableMultimap.Builder> keyToValueKeyBuilder = ImmutableMultimap.builder();
ImmutableMap.Builder, Binding> valueKeyToBindingBuilder = ImmutableMap.builder();
ImmutableMap.Builder, K> valueKeyToKeyBuilder = ImmutableMap.builder();
ImmutableMap.Builder, Binding>>>
valueKeyToEntryBindingBuilder = ImmutableMap.builder();
for (Element element : elements) {
if (element instanceof Binding) {
Binding binding = (Binding) element;
if (bindingSelection.matchesValueKey(binding.getKey())
&& binding.getKey().getTypeLiteral().equals(bindingSelection.valueType)) {
// Safe because of the check on the type literal above
@SuppressWarnings("unchecked")
Binding typedBinding = (Binding) binding;
Key typedKey = typedBinding.getKey();
valueKeyToBindingBuilder.put(typedKey, typedBinding);
}
}
if (element instanceof ProviderInstanceBinding
&& bindingSelection.getEntrySetBinder().containsElement(element)) {
// Safe because of the instanceof check, and containsElement() check
@SuppressWarnings({"unchecked", "rawtypes"})
ProviderInstanceBinding>> entryBinding =
(ProviderInstanceBinding) element;
// Safe because of the check for containsElement() above
@SuppressWarnings("unchecked")
Provider>> typedProvider =
(Provider>>) entryBinding.getUserSuppliedProvider();
Provider>> userSuppliedProvider = typedProvider;
if (userSuppliedProvider instanceof ProviderMapEntry) {
// Safe because of the instanceof check
@SuppressWarnings("unchecked")
ProviderMapEntry typedUserSuppliedProvider =
(ProviderMapEntry) userSuppliedProvider;
ProviderMapEntry entry = typedUserSuppliedProvider;
keyToValueKeyBuilder.put(entry.getKey(), entry.getValueKey());
valueKeyToEntryBindingBuilder.put(entry.getValueKey(), entryBinding);
valueKeyToKeyBuilder.put(entry.getValueKey(), entry.getKey());
}
}
}
ImmutableMultimap> keyToValueKey = keyToValueKeyBuilder.build();
ImmutableMap