/**
* 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;
import com.google.inject.util.ToStringBuilder;
/**
* @author crazybob@google.com (Bob Lee)
*/
class BindingImpl<T> implements Binding<T> {
final InjectorImpl injector;
final Key<T> key;
final Object source;
final InternalFactory<? extends T> internalFactory;
BindingImpl(InjectorImpl injector, Key<T> key, Object source,
InternalFactory<? extends T> internalFactory) {
this.injector = injector;
this.key = key;
this.source = source;
this.internalFactory = internalFactory;
}
public Key<T> getKey() {
return key;
}
public Object getSource() {
return source;
}
volatile Provider<T> provider;
public Provider<T> getProvider() {
if (provider == null) {
provider = injector.getProvider(key);
}
return provider;
}
InternalFactory<? extends T> getInternalFactory() {
return internalFactory;
}
static <T> BindingImpl<T> newInstance(InjectorImpl injector, Key<T> key,
Object source, InternalFactory<? extends T> internalFactory) {
return new BindingImpl<T>(injector, key, source, internalFactory);
}
/**
* Is this a constant binding?
*/
boolean isConstant() {
return internalFactory instanceof ConstantFactory<?>;
}
public String toString() {
return new ToStringBuilder(BindingImpl.class)
.add("key", key)
.add("source", source)
.add("provider", internalFactory)
.toString();
}
}