/*
* Copyright 2002-2012 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 org.springframework.web.servlet.view.tiles3;
import java.util.Locale;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tiles.TilesContainer;
import org.apache.tiles.access.TilesAccess;
import org.apache.tiles.renderer.DefinitionRenderer;
import org.apache.tiles.request.ApplicationContext;
import org.apache.tiles.request.Request;
import org.apache.tiles.request.render.Renderer;
import org.apache.tiles.request.servlet.ServletRequest;
import org.apache.tiles.request.servlet.ServletUtil;
import org.springframework.web.servlet.support.JstlUtils;
import org.springframework.web.servlet.support.RequestContext;
import org.springframework.web.servlet.support.RequestContextUtils;
import org.springframework.web.servlet.view.AbstractUrlBasedView;
import org.springframework.web.util.WebUtils;
/**
* {@link org.springframework.web.servlet.View} implementation that renders
* through the Tiles Request API. The "url" property is interpreted as name of a
* Tiles definition.
*
* @author Nicolas Le Bas
* @author mick semb wever
* @author Rossen Stoyanchev
* @since 3.2
*/
public class TilesView extends AbstractUrlBasedView {
private Renderer renderer;
private boolean exposeForwardAttributes = false;
private boolean exposeJstlAttributes = true;
private ApplicationContext applicationContext;
/**
* Set the {@link Renderer} to use.
* If not set, by default {@link DefinitionRenderer} is used.
*/
public void setRenderer(Renderer renderer) {
this.renderer = renderer;
}
/**
* Whether to expose JSTL attributes. By default set to {@code true}.
* @see JstlUtils#exposeLocalizationContext(RequestContext)
*/
protected void setExposeJstlAttributes(boolean exposeJstlAttributes) {
this.exposeJstlAttributes = exposeJstlAttributes;
}
@Override
protected void initServletContext(ServletContext servletContext) {
super.initServletContext(servletContext);
if (servletContext.getMajorVersion() == 2 && servletContext.getMinorVersion() < 5) {
this.exposeForwardAttributes = true;
}
}
@Override
public void afterPropertiesSet() throws Exception {
super.afterPropertiesSet();
this.applicationContext = ServletUtil.getApplicationContext(getServletContext());
if (this.renderer == null) {
TilesContainer container = TilesAccess.getContainer(this.applicationContext);
this.renderer = new DefinitionRenderer(container);
}
}
@Override
public boolean checkResource(final Locale locale) throws Exception {
Request request = new ServletRequest(this.applicationContext, null, null) {
@Override
public Locale getRequestLocale() {
return locale;
}
};
return this.renderer.isRenderable(getUrl(), request);
}
@Override
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
HttpServletResponse response) throws Exception {
exposeModelAsRequestAttributes(model, request);
if (this.exposeJstlAttributes) {
ServletContext servletContext = getServletContext();
JstlUtils.exposeLocalizationContext(new RequestContext(request, servletContext));
}
if (!response.isCommitted()) {
// Tiles is going to use a forward, but some web containers (e.g.
// OC4J 10.1.3)
// do not properly expose the Servlet 2.4 forward request
// attributes... However,
// must not do this on Servlet 2.5 or above, mainly for GlassFish
// compatibility.
if (this.exposeForwardAttributes) {
try {
WebUtils.exposeForwardRequestAttributes(request);
} catch (Exception ex) {
// Servlet container rejected to set internal attributes,
// e.g. on TriFork.
this.exposeForwardAttributes = false;
}
}
}
Request tilesRequest = createTilesRequest(request, response);
this.renderer.render(getUrl(), tilesRequest);
}
/**
* Create a Tiles {@link Request}. This implementation creates a
* {@link ServletRequest}.
*
* @param request the current request
* @param response the current response
* @return the Tiles request
*/
protected Request createTilesRequest(final HttpServletRequest request, HttpServletResponse response) {
return new ServletRequest(this.applicationContext, request, response) {
@Override
public Locale getRequestLocale() {
return RequestContextUtils.getLocale(request);
}
};
}
}