org.apache.tiles.request.render.DispatchRenderer Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tiles.request.render;
import java.io.IOException;
import org.apache.tiles.request.Request;
import org.apache.tiles.request.DispatchRequest;
import org.apache.tiles.request.RequestWrapper;
/**
* Renders an attribute that contains a reference to a template.
*/
public class DispatchRenderer implements Renderer {
/** {@inheritDoc} */
@Override
public void render(String path, Request request) throws IOException {
if (path == null) {
throw new CannotRenderException("Cannot dispatch a null path");
}
DispatchRequest dispatchRequest = getDispatchRequest(request);
if (dispatchRequest == null) {
throw new CannotRenderException("Cannot dispatch outside of a web environment");
}
dispatchRequest.dispatch(path);
}
/** {@inheritDoc} */
public boolean isRenderable(String path, Request request) {
return path != null && getDispatchRequest(request) != null && path.startsWith("/");
}
private DispatchRequest getDispatchRequest(Request request) {
Request result = request;
while (!(result instanceof DispatchRequest) && result instanceof RequestWrapper) {
result = ((RequestWrapper) result).getWrappedRequest();
}
if (!(result instanceof DispatchRequest)) {
result = null;
}
return (DispatchRequest) result;
}
}