| /* |
| * 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.common.base.MoreObjects; |
| import com.google.inject.Binding; |
| import com.google.inject.Key; |
| import com.google.inject.Provider; |
| import com.google.inject.spi.BindingScopingVisitor; |
| import com.google.inject.spi.ElementVisitor; |
| import com.google.inject.spi.InstanceBinding; |
| |
| /** @author crazybob@google.com (Bob Lee) */ |
| public abstract class BindingImpl<T> implements Binding<T> { |
| |
| private final InjectorImpl injector; |
| private final Key<T> key; |
| private final Object source; |
| private final Scoping scoping; |
| private final InternalFactory<? extends T> internalFactory; |
| |
| public BindingImpl( |
| InjectorImpl injector, |
| Key<T> key, |
| Object source, |
| InternalFactory<? extends T> internalFactory, |
| Scoping scoping) { |
| this.injector = injector; |
| this.key = key; |
| this.source = source; |
| this.internalFactory = internalFactory; |
| this.scoping = scoping; |
| } |
| |
| protected BindingImpl(Object source, Key<T> key, Scoping scoping) { |
| this.internalFactory = null; |
| this.injector = null; |
| this.source = source; |
| this.key = key; |
| this.scoping = scoping; |
| } |
| |
| @Override |
| public Key<T> getKey() { |
| return key; |
| } |
| |
| @Override |
| public Object getSource() { |
| return source; |
| } |
| |
| private volatile Provider<T> provider; |
| |
| @Override |
| public Provider<T> getProvider() { |
| if (provider == null) { |
| if (injector == null) { |
| throw new UnsupportedOperationException("getProvider() not supported for module bindings"); |
| } |
| |
| provider = injector.getProvider(key); |
| } |
| return provider; |
| } |
| |
| public InternalFactory<? extends T> getInternalFactory() { |
| return internalFactory; |
| } |
| |
| public Scoping getScoping() { |
| return scoping; |
| } |
| |
| /** |
| * Is this a constant binding? This returns true for constant bindings as well as toInstance() |
| * bindings. |
| */ |
| public boolean isConstant() { |
| return this instanceof InstanceBinding; |
| } |
| |
| @Override |
| public <V> V acceptVisitor(ElementVisitor<V> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public <V> V acceptScopingVisitor(BindingScopingVisitor<V> visitor) { |
| return scoping.acceptVisitor(visitor); |
| } |
| |
| protected BindingImpl<T> withScoping(Scoping scoping) { |
| throw new AssertionError(); |
| } |
| |
| protected BindingImpl<T> withKey(Key<T> key) { |
| throw new AssertionError(); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(Binding.class) |
| .add("key", key) |
| .add("scope", scoping) |
| .add("source", source) |
| .toString(); |
| } |
| |
| public InjectorImpl getInjector() { |
| return injector; |
| } |
| } |