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/****************************************************************************
* Sangria *
* Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* 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.tavianator.sangria.core;
import javax.inject.Inject;
import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.CreationException;
import com.google.inject.Injector;
import com.google.inject.spi.Message;
/**
* Similar to {@link Binder#addError(String, Object...)}, but can be canceled later. Useful for enforcing correct usage
* of fluent APIs.
*
* @author Tavian Barnes (tavianator@tavianator.com)
* @version 1.0
* @since 1.0
*/
public class DelayedError {
private Throwable error;
/**
* Create a {@link DelayedError}.
*
* @param binder The binder to attach the error to.
* @param message The format string for the message.
* @param args Arguments that will be passed to the format string.
* @return A {@link DelayedError} token that can be canceled later.
* @see Binder#addError(String, Object...)
*/
public static DelayedError create(Binder binder, String message, Object... args) {
return create(binder, new Message(PrettyTypes.format(message, args)));
}
/**
* Create a {@link DelayedError}.
*
* @param binder The binder to attach the error to.
* @param t The {@link Throwable} that caused this potential error.
* @return A {@link DelayedError} token that can be canceled later.
* @see Binder#addError(Throwable)
*/
public static DelayedError create(Binder binder, Throwable t) {
DelayedError error = new DelayedError(t);
binder.skipSources(DelayedError.class)
.requestInjection(error);
return error;
}
/**
* Create a {@link DelayedError}.
*
* @param binder The binder to attach the error to.
* @param message The error message.
* @return A {@link DelayedError} token that can be canceled later.
* @see Binder#addError(Message)
*/
public static DelayedError create(Binder binder, Message message) {
// Using CreationException allows Guice to extract the Message and format it nicely
return create(binder, new CreationException(ImmutableList.of(message)));
}
private DelayedError(Throwable error) {
this.error = error;
}
/**
* Cancel this error.
*/
public void cancel() {
this.error = null;
}
@Inject
void inject(Injector injector) throws Throwable {
if (error != null) {
throw error;
}
}
}
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