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// Copyright (C) 2012 The Android Open Source Project
//
// 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.google.gerrit.httpd.plugins;
import static com.google.gerrit.server.plugins.AutoRegisterUtil.calculateBindAnnotation;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.gerrit.extensions.annotations.Export;
import com.google.gerrit.server.plugins.InvalidPluginException;
import com.google.gerrit.server.plugins.ModuleGenerator;
import com.google.inject.Module;
import com.google.inject.Scopes;
import com.google.inject.TypeLiteral;
import com.google.inject.servlet.ServletModule;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServlet;
class HttpAutoRegisterModuleGenerator extends ServletModule implements ModuleGenerator {
private final Map<String, Class<HttpServlet>> serve = new HashMap<>();
private final ListMultimap<TypeLiteral<?>, Class<?>> listeners = LinkedListMultimap.create();
@Override
protected void configureServlets() {
for (Map.Entry<String, Class<HttpServlet>> e : serve.entrySet()) {
bind(e.getValue()).in(Scopes.SINGLETON);
serve(e.getKey()).with(e.getValue());
}
for (Map.Entry<TypeLiteral<?>, Class<?>> e : listeners.entries()) {
@SuppressWarnings("unchecked")
TypeLiteral<Object> type = (TypeLiteral<Object>) e.getKey();
@SuppressWarnings("unchecked")
Class<Object> impl = (Class<Object>) e.getValue();
Annotation n = calculateBindAnnotation(impl);
bind(type).annotatedWith(n).to(impl);
}
}
@Override
public void setPluginName(String name) {}
@SuppressWarnings("unchecked")
@Override
public void export(Export export, Class<?> type) throws InvalidPluginException {
if (HttpServlet.class.isAssignableFrom(type)) {
Class<HttpServlet> old = serve.get(export.value());
if (old != null) {
throw new InvalidPluginException(
String.format(
"@Export(\"%s\") has duplicate bindings:\n %s\n %s",
export.value(), old.getName(), type.getName()));
}
serve.put(export.value(), (Class<HttpServlet>) type);
} else {
throw new InvalidPluginException(
String.format(
"Class %s with @Export(\"%s\") must extend %s",
type.getName(), export.value(), HttpServlet.class.getName()));
}
}
@Override
public void listen(TypeLiteral<?> tl, Class<?> clazz) {
listeners.put(tl, clazz);
}
@Override
public Module create() throws InvalidPluginException {
return this;
}
}
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