/**
* Copyright (C) 2009 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.ImmutableList;
import org.elasticsearch.common.collect.ImmutableSet;
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.spi.InjectionListener;
import org.elasticsearch.common.inject.spi.InjectionPoint;
/**
* Injects members of instances of a given type.
*
* @author jessewilson@google.com (Jesse Wilson)
*/
class MembersInjectorImpl<T> implements MembersInjector<T> {
private final TypeLiteral<T> typeLiteral;
private final InjectorImpl injector;
private final ImmutableList<SingleMemberInjector> memberInjectors;
private final ImmutableList<MembersInjector<? super T>> userMembersInjectors;
private final ImmutableList<InjectionListener<? super T>> injectionListeners;
MembersInjectorImpl(InjectorImpl injector, TypeLiteral<T> typeLiteral,
EncounterImpl<T> encounter, ImmutableList<SingleMemberInjector> memberInjectors) {
this.injector = injector;
this.typeLiteral = typeLiteral;
this.memberInjectors = memberInjectors;
this.userMembersInjectors = encounter.getMembersInjectors();
this.injectionListeners = encounter.getInjectionListeners();
}
public ImmutableList<SingleMemberInjector> getMemberInjectors() {
return memberInjectors;
}
public void injectMembers(T instance) {
Errors errors = new Errors(typeLiteral);
try {
injectAndNotify(instance, errors);
} catch (ErrorsException e) {
errors.merge(e.getErrors());
}
errors.throwProvisionExceptionIfErrorsExist();
}
void injectAndNotify(final T instance, final Errors errors) throws ErrorsException {
if (instance == null) {
return;
}
injector.callInContext(new ContextualCallable<Void>() {
public Void call(InternalContext context) throws ErrorsException {
injectMembers(instance, errors, context);
return null;
}
});
notifyListeners(instance, errors);
}
void notifyListeners(T instance, Errors errors) throws ErrorsException {
int numErrorsBefore = errors.size();
for (InjectionListener<? super T> injectionListener : injectionListeners) {
try {
injectionListener.afterInjection(instance);
} catch (RuntimeException e) {
errors.errorNotifyingInjectionListener(injectionListener, typeLiteral, e);
}
}
errors.throwIfNewErrors(numErrorsBefore);
}
void injectMembers(T t, Errors errors, InternalContext context) {
// optimization: use manual for/each to save allocating an iterator here
for (int i = 0, size = memberInjectors.size(); i < size; i++) {
memberInjectors.get(i).inject(errors, context, t);
}
// optimization: use manual for/each to save allocating an iterator here
for (int i = 0, size = userMembersInjectors.size(); i < size; i++) {
MembersInjector<? super T> userMembersInjector = userMembersInjectors.get(i);
try {
userMembersInjector.injectMembers(t);
} catch (RuntimeException e) {
errors.errorInUserInjector(userMembersInjector, typeLiteral, e);
}
}
}
@Override public String toString() {
return "MembersInjector<" + typeLiteral + ">";
}
public ImmutableSet<InjectionPoint> getInjectionPoints() {
ImmutableSet.Builder<InjectionPoint> builder = ImmutableSet.builder();
for (SingleMemberInjector memberInjector : memberInjectors) {
builder.add(memberInjector.getInjectionPoint());
}
return builder.build();
}
}