/*
* Copyright 2014 the original author or authors.
*
* 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 ratpack.render.internal;
import com.google.common.base.Predicate;
import com.google.common.reflect.TypeToken;
import ratpack.handling.Context;
import ratpack.render.NoSuchRendererException;
import ratpack.render.Renderer;
import ratpack.render.RendererException;
public class DefaultRenderController implements RenderController {
private static final TypeToken<Renderer<?>> RENDERER_TYPE_TOKEN = new TypeToken<Renderer<?>>() {
private static final long serialVersionUID = 0;
};
@Override
public void render(final Object toRender, final Context context) throws Exception {
if (toRender == null) {
context.clientError(404);
return;
}
Renderer<?> renderer = context.first(RENDERER_TYPE_TOKEN, new RendererForTypePredicate(toRender.getClass()))
.orElseThrow(() -> new NoSuchRendererException(toRender));
try {
doRender(toRender, renderer, context);
} catch (Exception e) {
throw new RendererException(renderer, toRender, e);
}
}
private <T> void doRender(Object object, Renderer<T> renderer, Context context) throws Exception {
@SuppressWarnings("unchecked") T cast = (T) object;
renderer.render(context, cast);
}
private static class RendererForTypePredicate implements Predicate<Renderer<?>> {
private final Class<?> toRenderType;
public RendererForTypePredicate(Class<?> toRenderType) {
this.toRenderType = toRenderType;
}
@Override
public boolean apply(Renderer<?> renderer) {
return renderer.getType().isAssignableFrom(toRenderType);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
RendererForTypePredicate that = (RendererForTypePredicate) o;
return toRenderType.equals(that.toRenderType);
}
@Override
public int hashCode() {
return toRenderType.hashCode();
}
}
}