/*
* Copyright 2010 Proofpoint, 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.proofpoint.event.client;
import com.google.common.annotations.Beta;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.TypeLiteral;
import com.google.inject.multibindings.Multibinder;
import java.util.List;
import static com.proofpoint.event.client.EventTypeMetadata.getEventTypeMetadata;
@Beta
public class EventBinder
{
public static EventBinder eventBinder(Binder binder)
{
return new EventBinder(binder);
}
private final Binder binder;
private EventBinder(Binder binder)
{
this.binder = binder;
}
public void bindEventClient(Class<?>... types)
{
bindGenericEventClient(types);
}
public void bindGenericEventClient(Class<?>... eventTypes)
{
Preconditions.checkNotNull(eventTypes, "eventTypes is null");
bindGenericEventClient(ImmutableList.copyOf(eventTypes));
}
public void bindGenericEventClient(List<Class<?>> eventTypes)
{
Preconditions.checkNotNull(eventTypes, "eventTypes is null");
Preconditions.checkArgument(!eventTypes.isEmpty(), "eventTypes is empty");
Binder sourcedBinder = binder.withSource(getCaller());
Multibinder<EventTypeMetadata<?>> metadataBinder = Multibinder.newSetBinder(binder, new TypeLiteral<EventTypeMetadata<?>>() {});
// Bind event type metadata and bind any errors into Guice
for (Class<?> eventType : eventTypes) {
EventTypeMetadata<?> eventTypeMetadata = getEventTypeMetadata(eventType);
metadataBinder.addBinding().toInstance(eventTypeMetadata);
for (String error : eventTypeMetadata.getErrors()) {
sourcedBinder.addError(error);
}
}
}
private static StackTraceElement getCaller()
{
// find the caller of this class to report source
StackTraceElement[] stack = Thread.currentThread().getStackTrace();
boolean foundThisClass = false;
for (StackTraceElement element : stack) {
if (!foundThisClass) {
if (element.getClassName().equals(EventBinder.class.getName())) {
foundThisClass = true;
}
}
else {
if (!element.getClassName().equals(EventBinder.class.getName())) {
return element;
}
}
}
return null;
}
}