| /** |
| * Copyright (C) 2006 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.inject.Binder; |
| import com.google.inject.Binding; |
| import com.google.inject.ConfigurationException; |
| import com.google.inject.ImplementedBy; |
| import com.google.inject.Injector; |
| import com.google.inject.Key; |
| import com.google.inject.MembersInjector; |
| import com.google.inject.Module; |
| import com.google.inject.ProvidedBy; |
| import com.google.inject.Provider; |
| import com.google.inject.ProvisionException; |
| import com.google.inject.TypeLiteral; |
| import com.google.inject.Scope; |
| import com.google.inject.spi.BindingTargetVisitor; |
| import com.google.inject.spi.ConvertedConstantBinding; |
| import com.google.inject.spi.Dependency; |
| import com.google.inject.spi.InjectionPoint; |
| import com.google.inject.spi.ProviderBinding; |
| import com.google.inject.spi.ProviderKeyBinding; |
| import com.google.inject.spi.HasDependencies; |
| import com.google.inject.util.Providers; |
| import java.lang.reflect.GenericArrayType; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.lang.annotation.Annotation; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Default {@link Injector} implementation. |
| * |
| * @author crazybob@google.com (Bob Lee) |
| * @see InjectorBuilder |
| */ |
| final class InjectorImpl implements Injector, Lookups { |
| public static final TypeLiteral<String> STRING_TYPE = TypeLiteral.get(String.class); |
| |
| final State state; |
| final InjectorImpl parent; |
| final BindingsMultimap bindingsMultimap = new BindingsMultimap(); |
| final Initializer initializer; |
| |
| /** Just-in-time binding cache. Guarded by state.lock() */ |
| final Map<Key<?>, BindingImpl<?>> jitBindings = Maps.newHashMap(); |
| |
| Lookups lookups = new DeferredLookups(this); |
| |
| InjectorImpl(@Nullable InjectorImpl parent, State state, Initializer initializer) { |
| this.parent = parent; |
| this.state = state; |
| this.initializer = initializer; |
| |
| if (parent != null) { |
| localContext = parent.localContext; |
| } else { |
| localContext = new ThreadLocal<Object[]>() { |
| protected Object[] initialValue() { |
| return new Object[1]; |
| } |
| }; |
| } |
| } |
| |
| /** Indexes bindings by type. */ |
| void index() { |
| for (Binding<?> binding : state.getExplicitBindingsThisLevel().values()) { |
| index(binding); |
| } |
| } |
| |
| <T> void index(Binding<T> binding) { |
| bindingsMultimap.put(binding.getKey().getTypeLiteral(), binding); |
| } |
| |
| public <T> List<Binding<T>> findBindingsByType(TypeLiteral<T> type) { |
| return bindingsMultimap.getAll(type); |
| } |
| |
| /** Returns the binding for {@code key} */ |
| public <T> BindingImpl<T> getBinding(Key<T> key) { |
| Errors errors = new Errors(key); |
| try { |
| BindingImpl<T> result = getBindingOrThrow(key, errors); |
| errors.throwConfigurationExceptionIfErrorsExist(); |
| return result; |
| } catch (ErrorsException e) { |
| throw new ConfigurationException(errors.merge(e.getErrors()).getMessages()); |
| } |
| } |
| |
| /** |
| * Gets a binding implementation. First, it check to see if the parent has a binding. If the |
| * parent has a binding and the binding is scoped, it will use that binding. Otherwise, this |
| * checks for an explicit binding. If no explicit binding is found, it looks for a just-in-time |
| * binding. |
| */ |
| <T> BindingImpl<T> getBindingOrThrow(Key<T> key, Errors errors) |
| throws ErrorsException { |
| // Check explicit bindings, i.e. bindings created by modules. |
| BindingImpl<T> binding = state.getExplicitBinding(key); |
| if (binding != null) { |
| return binding; |
| } |
| |
| // Look for an on-demand binding. |
| return getJustInTimeBinding(key, errors); |
| } |
| |
| public <T> Binding<T> getBinding(Class<T> type) { |
| return getBinding(Key.get(type)); |
| } |
| |
| public Injector getParent() { |
| return parent; |
| } |
| |
| public Injector createChildInjector(Iterable<? extends Module> modules) { |
| return new InjectorBuilder() |
| .parentInjector(this) |
| .addModules(modules) |
| .build(); |
| } |
| |
| public Injector createChildInjector(Module... modules) { |
| return createChildInjector(ImmutableList.of(modules)); |
| } |
| |
| /** |
| * Returns a just-in-time binding for {@code key}, creating it if necessary. |
| * |
| * @throws ErrorsException if the binding could not be created. |
| */ |
| private <T> BindingImpl<T> getJustInTimeBinding(Key<T> key, Errors errors) |
| throws ErrorsException { |
| synchronized (state.lock()) { |
| // first try to find a JIT binding that we've already created |
| for (InjectorImpl injector = this; injector != null; injector = injector.parent) { |
| @SuppressWarnings("unchecked") // we only store bindings that match their key |
| BindingImpl<T> binding = (BindingImpl<T>) injector.jitBindings.get(key); |
| |
| if (binding != null) { |
| return binding; |
| } |
| } |
| |
| return createJustInTimeBindingRecursive(key, errors); |
| } |
| } |
| |
| /** Returns true if the key type is Provider (but not a subclass of Provider). */ |
| private static boolean isProvider(Key<?> key) { |
| return key.getTypeLiteral().getRawType().equals(Provider.class); |
| } |
| |
| /** Returns true if the key type is MembersInjector (but not a subclass of MembersInjector). */ |
| private static boolean isMembersInjector(Key<?> key) { |
| return key.getTypeLiteral().getRawType().equals(MembersInjector.class) |
| && !(key.getAnnotationType() != null); |
| } |
| |
| private <T> BindingImpl<MembersInjector<T>> createMembersInjectorBinding( |
| Key<MembersInjector<T>> key, Errors errors) throws ErrorsException { |
| Type membersInjectorType = key.getTypeLiteral().getType(); |
| if (!(membersInjectorType instanceof ParameterizedType)) { |
| throw errors.cannotInjectRawMembersInjector().toException(); |
| } |
| |
| @SuppressWarnings("unchecked") // safe because T came from Key<MembersInjector<T>> |
| TypeLiteral<T> instanceType = (TypeLiteral<T>) TypeLiteral.get( |
| ((ParameterizedType) membersInjectorType).getActualTypeArguments()[0]); |
| MembersInjector<T> membersInjector = membersInjectorStore.get(instanceType, errors); |
| |
| InternalFactory<MembersInjector<T>> factory = new ConstantFactory<MembersInjector<T>>( |
| Initializables.of(membersInjector)); |
| |
| |
| return new InstanceBindingImpl<MembersInjector<T>>(this, key, SourceProvider.UNKNOWN_SOURCE, |
| factory, ImmutableSet.<InjectionPoint>of(), membersInjector); |
| } |
| |
| /** |
| * Creates a synthetic binding to {@code Provider<T>}, i.e. a binding to the provider from |
| * {@code Binding<T>}. |
| */ |
| private <T> BindingImpl<Provider<T>> createProviderBinding(Key<Provider<T>> key, Errors errors) |
| throws ErrorsException { |
| Type providerType = key.getTypeLiteral().getType(); |
| |
| // If the Provider has no type parameter (raw Provider)... |
| if (!(providerType instanceof ParameterizedType)) { |
| throw errors.cannotInjectRawProvider().toException(); |
| } |
| |
| Type entryType = ((ParameterizedType) providerType).getActualTypeArguments()[0]; |
| |
| @SuppressWarnings("unchecked") // safe because T came from Key<Provider<T>> |
| Key<T> providedKey = (Key<T>) key.ofType(entryType); |
| |
| BindingImpl<T> delegate = getBindingOrThrow(providedKey, errors); |
| return new ProviderBindingImpl<T>(this, key, delegate); |
| } |
| |
| private static class ProviderBindingImpl<T> extends BindingImpl<Provider<T>> |
| implements ProviderBinding<Provider<T>>, HasDependencies { |
| final BindingImpl<T> providedBinding; |
| |
| ProviderBindingImpl(InjectorImpl injector, Key<Provider<T>> key, Binding<T> providedBinding) { |
| super(injector, key, providedBinding.getSource(), createInternalFactory(providedBinding), |
| Scoping.UNSCOPED); |
| this.providedBinding = (BindingImpl<T>) providedBinding; |
| } |
| |
| static <T> InternalFactory<Provider<T>> createInternalFactory(Binding<T> providedBinding) { |
| final Provider<T> provider = providedBinding.getProvider(); |
| return new InternalFactory<Provider<T>>() { |
| public Provider<T> get(Errors errors, InternalContext context, Dependency dependency) { |
| return provider; |
| } |
| }; |
| } |
| |
| public Key<? extends T> getProvidedKey() { |
| return providedBinding.getKey(); |
| } |
| |
| public <V> V acceptTargetVisitor(BindingTargetVisitor<? super Provider<T>, V> visitor) { |
| return visitor.visit(this); |
| } |
| |
| public void applyTo(Binder binder) { |
| throw new UnsupportedOperationException("This element represents a synthetic binding."); |
| } |
| |
| @Override public String toString() { |
| return new ToStringBuilder(ProviderKeyBinding.class) |
| .add("key", getKey()) |
| .add("providedKey", getProvidedKey()) |
| .toString(); |
| } |
| |
| public Set<Dependency<?>> getDependencies() { |
| return ImmutableSet.<Dependency<?>>of(Dependency.get(getProvidedKey())); |
| } |
| } |
| |
| /** |
| * Converts a constant string binding to the required type. |
| * |
| * @return the binding if it could be resolved, or null if the binding doesn't exist |
| * @throws com.google.inject.internal.ErrorsException if there was an error resolving the binding |
| */ |
| private <T> BindingImpl<T> convertConstantStringBinding(Key<T> key, Errors errors) |
| throws ErrorsException { |
| // Find a constant string binding. |
| Key<String> stringKey = key.ofType(STRING_TYPE); |
| BindingImpl<String> stringBinding = state.getExplicitBinding(stringKey); |
| if (stringBinding == null || !stringBinding.isConstant()) { |
| return null; |
| } |
| |
| String stringValue = stringBinding.getProvider().get(); |
| Object source = stringBinding.getSource(); |
| |
| // Find a matching type converter. |
| TypeLiteral<T> type = key.getTypeLiteral(); |
| MatcherAndConverter matchingConverter = state.getConverter(stringValue, type, errors, source); |
| |
| if (matchingConverter == null) { |
| // No converter can handle the given type. |
| return null; |
| } |
| |
| // Try to convert the string. A failed conversion results in an error. |
| try { |
| @SuppressWarnings("unchecked") // This cast is safe because we double check below. |
| T converted = (T) matchingConverter.getTypeConverter().convert(stringValue, type); |
| |
| if (converted == null) { |
| throw errors.converterReturnedNull(stringValue, source, type, matchingConverter) |
| .toException(); |
| } |
| |
| if (!type.getRawType().isInstance(converted)) { |
| throw errors.conversionTypeError(stringValue, source, type, matchingConverter, converted) |
| .toException(); |
| } |
| |
| return new ConvertedConstantBindingImpl<T>(this, key, converted, stringBinding); |
| } catch (ErrorsException e) { |
| throw e; |
| } catch (RuntimeException e) { |
| throw errors.conversionError(stringValue, source, type, matchingConverter, e) |
| .toException(); |
| } |
| } |
| |
| private static class ConvertedConstantBindingImpl<T> |
| extends BindingImpl<T> implements ConvertedConstantBinding<T> { |
| final T value; |
| final Provider<T> provider; |
| final Binding<String> originalBinding; |
| |
| ConvertedConstantBindingImpl( |
| InjectorImpl injector, Key<T> key, T value, Binding<String> originalBinding) { |
| super(injector, key, originalBinding.getSource(), |
| new ConstantFactory<T>(Initializables.of(value)), Scoping.UNSCOPED); |
| this.value = value; |
| provider = Providers.of(value); |
| this.originalBinding = originalBinding; |
| } |
| |
| @Override public Provider<T> getProvider() { |
| return provider; |
| } |
| |
| public <V> V acceptTargetVisitor(BindingTargetVisitor<? super T, V> visitor) { |
| return visitor.visit(this); |
| } |
| |
| public T getValue() { |
| return value; |
| } |
| |
| public Key<String> getSourceKey() { |
| return originalBinding.getKey(); |
| } |
| |
| public Set<Dependency<?>> getDependencies() { |
| return ImmutableSet.<Dependency<?>>of(Dependency.get(getSourceKey())); |
| } |
| |
| public void applyTo(Binder binder) { |
| throw new UnsupportedOperationException("This element represents a synthetic binding."); |
| } |
| |
| @Override public String toString() { |
| return new ToStringBuilder(ConvertedConstantBinding.class) |
| .add("key", getKey()) |
| .add("sourceKey", getSourceKey()) |
| .add("value", value) |
| .toString(); |
| } |
| } |
| |
| <T> void initializeBinding(BindingImpl<T> binding, Errors errors) throws ErrorsException { |
| if (binding instanceof ConstructorBindingImpl<?>) { |
| ((ConstructorBindingImpl) binding).initialize(this, errors); |
| } |
| } |
| |
| <T> void initializeJitBinding(BindingImpl<T> binding, Errors errors) throws ErrorsException { |
| // Put the partially constructed binding in the map a little early. This enables us to handle |
| // circular dependencies. Example: FooImpl -> BarImpl -> FooImpl. |
| // Note: We don't need to synchronize on state.lock() during injector creation. |
| // TODO: for the above example, remove the binding for BarImpl if the binding for FooImpl fails |
| if (binding instanceof ConstructorBindingImpl<?>) { |
| Key<T> key = binding.getKey(); |
| jitBindings.put(key, binding); |
| boolean successful = false; |
| try { |
| ((ConstructorBindingImpl) binding).initialize(this, errors); |
| successful = true; |
| } finally { |
| if (!successful) { |
| jitBindings.remove(key); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Creates a binding for an injectable type with the given scope. Looks for a scope on the type if |
| * none is specified. |
| */ |
| <T> BindingImpl<T> createUninitializedBinding(Key<T> key, Scoping scoping, Object source, |
| Errors errors) throws ErrorsException { |
| Class<?> rawType = key.getTypeLiteral().getRawType(); |
| |
| // Don't try to inject arrays, or enums. |
| if (rawType.isArray() || rawType.isEnum()) { |
| throw errors.missingImplementation(key).toException(); |
| } |
| |
| // Handle TypeLiteral<T> by binding the inner type |
| if (rawType == TypeLiteral.class) { |
| @SuppressWarnings("unchecked") // we have to fudge the inner type as Object |
| BindingImpl<T> binding = (BindingImpl<T>) createTypeLiteralBinding( |
| (Key<TypeLiteral<Object>>) key, errors); |
| return binding; |
| } |
| |
| // Handle @ImplementedBy |
| ImplementedBy implementedBy = rawType.getAnnotation(ImplementedBy.class); |
| if (implementedBy != null) { |
| Annotations.checkForMisplacedScopeAnnotations(rawType, source, errors); |
| return createImplementedByBinding(key, scoping, implementedBy, errors); |
| } |
| |
| // Handle @ProvidedBy. |
| ProvidedBy providedBy = rawType.getAnnotation(ProvidedBy.class); |
| if (providedBy != null) { |
| Annotations.checkForMisplacedScopeAnnotations(rawType, source, errors); |
| return createProvidedByBinding(key, scoping, providedBy, errors); |
| } |
| |
| return ConstructorBindingImpl.create(this, key, null, source, scoping, errors); |
| } |
| |
| /** |
| * Converts a binding for a {@code Key<TypeLiteral<T>>} to the value {@code TypeLiteral<T>}. It's |
| * a bit awkward because we have to pull out the inner type in the type literal. |
| */ |
| private <T> BindingImpl<TypeLiteral<T>> createTypeLiteralBinding( |
| Key<TypeLiteral<T>> key, Errors errors) throws ErrorsException { |
| Type typeLiteralType = key.getTypeLiteral().getType(); |
| if (!(typeLiteralType instanceof ParameterizedType)) { |
| throw errors.cannotInjectRawTypeLiteral().toException(); |
| } |
| |
| ParameterizedType parameterizedType = (ParameterizedType) typeLiteralType; |
| Type innerType = parameterizedType.getActualTypeArguments()[0]; |
| |
| // this is unforunate. We don't support building TypeLiterals for type variable like 'T'. If |
| // this proves problematic, we can probably fix TypeLiteral to support type variables |
| if (!(innerType instanceof Class) |
| && !(innerType instanceof GenericArrayType) |
| && !(innerType instanceof ParameterizedType)) { |
| throw errors.cannotInjectTypeLiteralOf(innerType).toException(); |
| } |
| |
| @SuppressWarnings("unchecked") // by definition, innerType == T, so this is safe |
| TypeLiteral<T> value = (TypeLiteral<T>) TypeLiteral.get(innerType); |
| InternalFactory<TypeLiteral<T>> factory = new ConstantFactory<TypeLiteral<T>>( |
| Initializables.of(value)); |
| return new InstanceBindingImpl<TypeLiteral<T>>(this, key, SourceProvider.UNKNOWN_SOURCE, |
| factory, ImmutableSet.<InjectionPoint>of(), value); |
| } |
| |
| /** Creates a binding for a type annotated with @ProvidedBy. */ |
| <T> BindingImpl<T> createProvidedByBinding(Key<T> key, Scoping scoping, |
| ProvidedBy providedBy, Errors errors) throws ErrorsException { |
| final Class<?> rawType = key.getTypeLiteral().getRawType(); |
| final Class<? extends Provider<?>> providerType = providedBy.value(); |
| |
| // Make sure it's not the same type. TODO: Can we check for deeper loops? |
| if (providerType == rawType) { |
| throw errors.recursiveProviderType().toException(); |
| } |
| |
| // Assume the provider provides an appropriate type. We double check at runtime. |
| @SuppressWarnings("unchecked") |
| final Key<? extends Provider<T>> providerKey |
| = (Key<? extends Provider<T>>) Key.get(providerType); |
| final BindingImpl<? extends Provider<?>> providerBinding |
| = getBindingOrThrow(providerKey, errors); |
| |
| InternalFactory<T> internalFactory = new InternalFactory<T>() { |
| public T get(Errors errors, InternalContext context, Dependency dependency) |
| throws ErrorsException { |
| errors = errors.withSource(providerKey); |
| Provider<?> provider = providerBinding.getInternalFactory().get( |
| errors, context, dependency); |
| try { |
| Object o = provider.get(); |
| if (o != null && !rawType.isInstance(o)) { |
| throw errors.subtypeNotProvided(providerType, rawType).toException(); |
| } |
| @SuppressWarnings("unchecked") // protected by isInstance() check above |
| T t = (T) o; |
| return t; |
| } catch (RuntimeException e) { |
| throw errors.errorInProvider(e).toException(); |
| } |
| } |
| }; |
| |
| Object source = rawType; |
| return new LinkedProviderBindingImpl<T>( |
| this, |
| key, |
| source, |
| Scoping.<T>scope(key, this, internalFactory, source, scoping), |
| scoping, |
| providerKey); |
| } |
| |
| /** Creates a binding for a type annotated with @ImplementedBy. */ |
| private <T> BindingImpl<T> createImplementedByBinding(Key<T> key, Scoping scoping, |
| ImplementedBy implementedBy, Errors errors) |
| throws ErrorsException { |
| Class<?> rawType = key.getTypeLiteral().getRawType(); |
| Class<?> implementationType = implementedBy.value(); |
| |
| // Make sure it's not the same type. TODO: Can we check for deeper cycles? |
| if (implementationType == rawType) { |
| throw errors.recursiveImplementationType().toException(); |
| } |
| |
| // Make sure implementationType extends type. |
| if (!rawType.isAssignableFrom(implementationType)) { |
| throw errors.notASubtype(implementationType, rawType).toException(); |
| } |
| |
| @SuppressWarnings("unchecked") // After the preceding check, this cast is safe. |
| Class<? extends T> subclass = (Class<? extends T>) implementationType; |
| |
| // Look up the target binding. |
| final Key<? extends T> targetKey = Key.get(subclass); |
| final BindingImpl<? extends T> targetBinding = getBindingOrThrow(targetKey, errors); |
| |
| InternalFactory<T> internalFactory = new InternalFactory<T>() { |
| public T get(Errors errors, InternalContext context, Dependency<?> dependency) |
| throws ErrorsException { |
| return targetBinding.getInternalFactory().get( |
| errors.withSource(targetKey), context, dependency); |
| } |
| }; |
| |
| Object source = rawType; |
| return new LinkedBindingImpl<T>( |
| this, |
| key, |
| source, |
| Scoping.<T>scope(key, this, internalFactory, source, scoping), |
| scoping, |
| targetKey); |
| } |
| |
| /** |
| * Attempts to create a just-in-time binding for {@code key} in the root injector, falling back to |
| * other ancestor injectors until this injector is tried. |
| */ |
| private <T> BindingImpl<T> createJustInTimeBindingRecursive(Key<T> key, Errors errors) |
| throws ErrorsException { |
| // ask the parent to create the JIT binding |
| if (parent != null) { |
| try { |
| return parent.createJustInTimeBindingRecursive(key, new Errors()); |
| } catch (ErrorsException ignored) { |
| } |
| } |
| |
| if (state.isBlacklisted(key)) { |
| throw errors.childBindingAlreadySet(key).toException(); |
| } |
| |
| BindingImpl<T> binding = createJustInTimeBinding(key, errors); |
| state.parent().blacklist(key); |
| jitBindings.put(key, binding); |
| return binding; |
| } |
| |
| /** |
| * Returns a new just-in-time binding created by resolving {@code key}. The strategies used to |
| * create just-in-time bindings are: |
| * <ol> |
| * <li>Internalizing Providers. If the requested binding is for {@code Provider<T>}, we delegate |
| * to the binding for {@code T}. |
| * <li>Converting constants. |
| * <li>ImplementedBy and ProvidedBy annotations. Only for unannotated keys. |
| * <li>The constructor of the raw type. Only for unannotated keys. |
| * </ol> |
| * |
| * @throws com.google.inject.internal.ErrorsException if the binding cannot be created. |
| */ |
| private <T> BindingImpl<T> createJustInTimeBinding(Key<T> key, Errors errors) |
| throws ErrorsException { |
| int numErrorsBefore = errors.size(); |
| |
| if (state.isBlacklisted(key)) { |
| throw errors.childBindingAlreadySet(key).toException(); |
| } |
| |
| // Handle cases where T is a Provider<?>. |
| if (isProvider(key)) { |
| // These casts are safe. We know T extends Provider<X> and that given Key<Provider<X>>, |
| // createProviderBinding() will return BindingImpl<Provider<X>>. |
| @SuppressWarnings("unchecked") |
| BindingImpl<T> binding = (BindingImpl<T>) createProviderBinding((Key) key, errors); |
| return binding; |
| } |
| |
| // Handle cases where T is a MembersInjector<?> |
| if (isMembersInjector(key)) { |
| // These casts are safe. T extends MembersInjector<X> and that given Key<MembersInjector<X>>, |
| // createMembersInjectorBinding() will return BindingImpl<MembersInjector<X>>. |
| @SuppressWarnings("unchecked") |
| BindingImpl<T> binding = (BindingImpl<T>) createMembersInjectorBinding((Key) key, errors); |
| return binding; |
| } |
| |
| // Try to convert a constant string binding to the requested type. |
| BindingImpl<T> convertedBinding = convertConstantStringBinding(key, errors); |
| if (convertedBinding != null) { |
| return convertedBinding; |
| } |
| |
| // If the key has an annotation... |
| if (key.getAnnotationType() != null) { |
| // Look for a binding without annotation attributes or return null. |
| if (key.hasAttributes()) { |
| try { |
| Errors ignored = new Errors(); |
| return getBindingOrThrow(key.withoutAttributes(), ignored); |
| } catch (ErrorsException ignored) { |
| // throw with a more appropriate message below |
| } |
| } |
| throw errors.missingImplementation(key).toException(); |
| } |
| |
| Object source = key.getTypeLiteral().getRawType(); |
| BindingImpl<T> binding = createUninitializedBinding(key, Scoping.UNSCOPED, source, errors); |
| errors.throwIfNewErrors(numErrorsBefore); |
| initializeJitBinding(binding, errors); |
| return binding; |
| } |
| |
| <T> InternalFactory<? extends T> getInternalFactory(Key<T> key, Errors errors) |
| throws ErrorsException { |
| return getBindingOrThrow(key, errors).getInternalFactory(); |
| } |
| |
| public Map<Key<?>, Binding<?>> getBindings() { |
| return state.getExplicitBindingsThisLevel(); |
| } |
| |
| public Map<Key<?>, Binding<?>> getAllBindings() { |
| synchronized (state.lock()) { |
| return new ImmutableMap.Builder<Key<?>, Binding<?>>() |
| .putAll(state.getExplicitBindingsThisLevel()) |
| .putAll(jitBindings) |
| .build(); |
| } |
| } |
| |
| public Map<Class<? extends Annotation>, Scope> getScopeBindings() { |
| return state.getScopes(); |
| } |
| |
| private static class BindingsMultimap { |
| final Map<TypeLiteral<?>, List<Binding<?>>> multimap = Maps.newHashMap(); |
| |
| <T> void put(TypeLiteral<T> type, Binding<T> binding) { |
| List<Binding<?>> bindingsForType = multimap.get(type); |
| if (bindingsForType == null) { |
| bindingsForType = Lists.newArrayList(); |
| multimap.put(type, bindingsForType); |
| } |
| bindingsForType.add(binding); |
| } |
| |
| |
| @SuppressWarnings("unchecked") // safe because we only put matching entries into the map |
| <T> List<Binding<T>> getAll(TypeLiteral<T> type) { |
| List<Binding<?>> bindings = multimap.get(type); |
| return bindings != null |
| ? Collections.<Binding<T>>unmodifiableList((List) multimap.get(type)) |
| : ImmutableList.<Binding<T>>of(); |
| } |
| } |
| |
| /** |
| * Returns parameter injectors, or {@code null} if there are no parameters. |
| */ |
| SingleParameterInjector<?>[] getParametersInjectors( |
| List<Dependency<?>> parameters, Errors errors) throws ErrorsException { |
| if (parameters.isEmpty()) { |
| return null; |
| } |
| |
| int numErrorsBefore = errors.size(); |
| SingleParameterInjector<?>[] result = new SingleParameterInjector<?>[parameters.size()]; |
| int i = 0; |
| for (Dependency<?> parameter : parameters) { |
| try { |
| result[i++] = createParameterInjector(parameter, errors.withSource(parameter)); |
| } catch (ErrorsException rethrownBelow) { |
| // rethrown below |
| } |
| } |
| |
| errors.throwIfNewErrors(numErrorsBefore); |
| return result; |
| } |
| |
| <T> SingleParameterInjector<T> createParameterInjector(final Dependency<T> dependency, |
| final Errors errors) throws ErrorsException { |
| InternalFactory<? extends T> factory = getInternalFactory(dependency.getKey(), errors); |
| return new SingleParameterInjector<T>(dependency, factory); |
| } |
| |
| /** Invokes a method. */ |
| interface MethodInvoker { |
| Object invoke(Object target, Object... parameters) |
| throws IllegalAccessException, InvocationTargetException; |
| } |
| |
| /** Cached constructor injectors for each type */ |
| final ConstructorInjectorStore constructors = new ConstructorInjectorStore(this); |
| |
| /** Cached field and method injectors for each type. */ |
| MembersInjectorStore membersInjectorStore; |
| |
| @SuppressWarnings("unchecked") // the members injector type is consistent with instance's type |
| public void injectMembers(Object instance) { |
| MembersInjector membersInjector = getMembersInjector(instance.getClass()); |
| membersInjector.injectMembers(instance); |
| } |
| |
| public <T> MembersInjector<T> getMembersInjector(TypeLiteral<T> typeLiteral) { |
| Errors errors = new Errors(typeLiteral); |
| try { |
| return membersInjectorStore.get(typeLiteral, errors); |
| } catch (ErrorsException e) { |
| throw new ConfigurationException(errors.merge(e.getErrors()).getMessages()); |
| } |
| } |
| |
| public <T> MembersInjector<T> getMembersInjector(Class<T> type) { |
| return getMembersInjector(TypeLiteral.get(type)); |
| } |
| |
| public <T> Provider<T> getProvider(Class<T> type) { |
| return getProvider(Key.get(type)); |
| } |
| |
| <T> Provider<T> getProviderOrThrow(final Key<T> key, Errors errors) throws ErrorsException { |
| final InternalFactory<? extends T> factory = getInternalFactory(key, errors); |
| final Dependency<T> dependency = Dependency.get(key); |
| |
| return new Provider<T>() { |
| public T get() { |
| final Errors errors = new Errors(dependency); |
| try { |
| T t = callInContext(new ContextualCallable<T>() { |
| public T call(InternalContext context) throws ErrorsException { |
| Dependency previous = context.setDependency(dependency); |
| try { |
| return factory.get(errors, context, dependency); |
| } finally { |
| context.setDependency(previous); |
| } |
| } |
| }); |
| errors.throwIfNewErrors(0); |
| return t; |
| } catch (ErrorsException e) { |
| throw new ProvisionException(errors.merge(e.getErrors()).getMessages()); |
| } |
| } |
| |
| @Override public String toString() { |
| return factory.toString(); |
| } |
| }; |
| } |
| |
| public <T> Provider<T> getProvider(final Key<T> key) { |
| Errors errors = new Errors(key); |
| try { |
| Provider<T> result = getProviderOrThrow(key, errors); |
| errors.throwIfNewErrors(0); |
| return result; |
| } catch (ErrorsException e) { |
| throw new ConfigurationException(errors.merge(e.getErrors()).getMessages()); |
| } |
| } |
| |
| public <T> T getInstance(Key<T> key) { |
| return getProvider(key).get(); |
| } |
| |
| public <T> T getInstance(Class<T> type) { |
| return getProvider(type).get(); |
| } |
| |
| final ThreadLocal<Object[]> localContext; |
| |
| /** Looks up thread local context. Creates (and removes) a new context if necessary. */ |
| <T> T callInContext(ContextualCallable<T> callable) throws ErrorsException { |
| Object[] reference = localContext.get(); |
| if (reference[0] == null) { |
| reference[0] = new InternalContext(); |
| try { |
| return callable.call((InternalContext)reference[0]); |
| } finally { |
| // Only clear the context if this call created it. |
| reference[0] = null; |
| } |
| } else { |
| // Someone else will clean up this context. |
| return callable.call((InternalContext)reference[0]); |
| } |
| } |
| |
| public String toString() { |
| return new ToStringBuilder(Injector.class) |
| .add("bindings", state.getExplicitBindingsThisLevel().values()) |
| .toString(); |
| } |
| |
| } |