Java tutorial
/* Copyright 2004-2005 Graeme Rocher * * 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.codehaus.groovy.grails.scaffolding.view; import groovy.lang.Writable; import java.io.IOException; import java.io.Writer; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.codehaus.groovy.grails.web.pages.GroovyPageTemplate; import org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine; import org.codehaus.groovy.grails.web.servlet.view.GroovyPageView; import org.codehaus.groovy.grails.web.sitemesh.GrailsLayoutDecoratorMapper; import org.springframework.util.Assert; /** * A special Spring View for scaffolding that renders an in-memory scaffolded view to the response. * * @author Graeme Rocher * @since 0.5 */ public class ScaffoldedGroovyPageView extends GroovyPageView { private String contents; private static final Log LOG = LogFactory.getLog(ScaffoldedGroovyPageView.class); public ScaffoldedGroovyPageView(String uri, String contents) { Assert.hasLength(contents, "Argument [contents] cannot be blank or null"); Assert.hasLength(uri, "Argument [uri] cannot be blank or null"); this.contents = contents; setUrl(uri); } /** * Used for debug reporting. * * @return The URL of the view */ @Override public String getBeanName() { return getUrl(); } /** * Overrides the default implementation to render a GSP view using an in-memory representation * held in the #contents property. * * @param templateEngine The GroovyPagesTemplateEngine instance * @param model The model * @param response The HttpServletResponse instance * * @throws IOException Thrown if there was an IO error rendering the view */ @SuppressWarnings("rawtypes") @Override protected void renderWithTemplateEngine(@SuppressWarnings("hiding") GroovyPagesTemplateEngine templateEngine, Map model, HttpServletResponse response, HttpServletRequest request) throws IOException { if (LOG.isDebugEnabled()) { LOG.debug("Rendering scaffolded view [" + getUrl() + "] with model [" + model + "]"); } request.setAttribute(GrailsLayoutDecoratorMapper.RENDERING_VIEW, Boolean.TRUE); Writable w = template.make(model); Writer out = null; try { out = createResponseWriter(response); w.writeTo(out); } catch (Exception e) { handleException(e, templateEngine); } finally { if (out != null) { out.close(); } } } @Override protected void initTemplate() throws IOException { template = templateEngine.createTemplate(contents, getUrl()); if (template instanceof GroovyPageTemplate) { ((GroovyPageTemplate) template).setAllowSettingContentType(true); } } }