/*
* Copyright (C) 2007 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 org.elasticsearch.common.inject;
import org.elasticsearch.common.collect.ImmutableSet;
import org.elasticsearch.common.inject.internal.BindingImpl;
import org.elasticsearch.common.inject.internal.Errors;
import org.elasticsearch.common.inject.internal.ErrorsException;
import org.elasticsearch.common.inject.internal.InternalContext;
import org.elasticsearch.common.inject.internal.InternalFactory;
import org.elasticsearch.common.inject.internal.Scoping;
import org.elasticsearch.common.inject.internal.ToStringBuilder;
import org.elasticsearch.common.inject.spi.BindingTargetVisitor;
import org.elasticsearch.common.inject.spi.ConstructorBinding;
import org.elasticsearch.common.inject.spi.Dependency;
import org.elasticsearch.common.inject.spi.InjectionPoint;
import java.util.Set;
import static org.elasticsearch.common.base.Preconditions.*;
class ConstructorBindingImpl<T> extends BindingImpl<T> implements ConstructorBinding<T> {
private final Factory<T> factory;
private ConstructorBindingImpl(Injector injector, Key<T> key, Object source,
InternalFactory<? extends T> scopedFactory, Scoping scoping, Factory<T> factory) {
super(injector, key, source, scopedFactory, scoping);
this.factory = factory;
}
static <T> ConstructorBindingImpl<T> create(
InjectorImpl injector, Key<T> key, Object source, Scoping scoping) {
Factory<T> factoryFactory = new Factory<T>();
InternalFactory<? extends T> scopedFactory
= Scopes.scope(key, injector, factoryFactory, scoping);
return new ConstructorBindingImpl<T>(
injector, key, source, scopedFactory, scoping, factoryFactory);
}
public void initialize(InjectorImpl injector, Errors errors) throws ErrorsException {
factory.constructorInjector = injector.constructors.get(getKey().getTypeLiteral(), errors);
}
public <V> V acceptTargetVisitor(BindingTargetVisitor<? super T, V> visitor) {
checkState(factory.constructorInjector != null, "not initialized");
return visitor.visit(this);
}
public InjectionPoint getConstructor() {
checkState(factory.constructorInjector != null, "Binding is not ready");
return factory.constructorInjector.getConstructionProxy().getInjectionPoint();
}
public Set<InjectionPoint> getInjectableMembers() {
checkState(factory.constructorInjector != null, "Binding is not ready");
return factory.constructorInjector.getInjectableMembers();
}
public Set<Dependency<?>> getDependencies() {
return Dependency.forInjectionPoints(new ImmutableSet.Builder<InjectionPoint>()
.add(getConstructor())
.addAll(getInjectableMembers())
.build());
}
public void applyTo(Binder binder) {
throw new UnsupportedOperationException("This element represents a synthetic binding.");
}
@Override public String toString() {
return new ToStringBuilder(ConstructorBinding.class)
.add("key", getKey())
.add("source", getSource())
.add("scope", getScoping())
.toString();
}
private static class Factory<T> implements InternalFactory<T> {
private ConstructorInjector<T> constructorInjector;
@SuppressWarnings("unchecked")
public T get(Errors errors, InternalContext context, Dependency<?> dependency)
throws ErrorsException {
checkState(constructorInjector != null, "Constructor not ready");
// This may not actually be safe because it could return a super type of T (if that's all the
// client needs), but it should be OK in practice thanks to the wonders of erasure.
return (T) constructorInjector.construct(errors, context, dependency.getKey().getRawType());
}
}
}