/*
* Copyright 2015 ArcBees 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.gwtplatform.dispatch.rest.processors.resource;
import java.util.List;
import java.util.ServiceLoader;
import com.google.common.collect.FluentIterable;
import com.gwtplatform.processors.tools.exceptions.UnableToProcessException;
import com.gwtplatform.processors.tools.logger.Logger;
import com.gwtplatform.processors.tools.outputter.CodeSnippet;
import com.gwtplatform.processors.tools.outputter.Outputter;
import com.gwtplatform.processors.tools.utils.Utils;
public class ResourceMethodProcessors {
private static final String NO_PROCESSORS_FOUND = "Can not find a resource method processor for `%s`.";
private static ServiceLoader<ResourceMethodProcessor> processors;
private static boolean initialized;
private final Logger logger;
private final Utils utils;
private final Outputter outputter;
public ResourceMethodProcessors(
Logger logger,
Utils utils,
Outputter outputter) {
this.logger = logger;
this.utils = utils;
this.outputter = outputter;
if (processors == null) {
processors = ServiceLoader.load(ResourceMethodProcessor.class, getClass().getClassLoader());
}
}
public List<CodeSnippet> processAll(List<ResourceMethod> methods) {
return FluentIterable.from(methods)
.transform(this::process)
.toList();
}
public CodeSnippet process(ResourceMethod context) {
ensureInitialized();
for (ResourceMethodProcessor processor : processors) {
if (processor.canProcess(context)) {
return processor.process(context);
}
}
logger.error(NO_PROCESSORS_FOUND, context.getMethod().getName());
throw new UnableToProcessException();
}
public void processLast() {
ensureInitialized();
for (ResourceMethodProcessor processor : processors) {
processor.processLast();
}
}
private void ensureInitialized() {
if (!initialized) {
for (ResourceMethodProcessor processor : processors) {
processor.init(logger, utils, outputter);
}
initialized = true;
}
}
}