001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.core.rendering;
020
021import java.io.File;
022import java.io.IOException;
023import java.io.StringReader;
024import java.io.StringWriter;
025import java.io.Writer;
026import java.net.MalformedURLException;
027import java.net.URL;
028import java.util.Map;
029
030import org.nuxeo.ecm.platform.rendering.api.RenderingException;
031import org.nuxeo.ecm.platform.rendering.api.ResourceLocator;
032import org.nuxeo.ecm.platform.rendering.fm.FreemarkerEngine;
033import org.nuxeo.runtime.api.Framework;
034import org.nuxeo.runtime.services.resource.ResourceService;
035
036import freemarker.core.Environment;
037import freemarker.template.Template;
038import freemarker.template.TemplateException;
039
040/**
041 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
042 */
043public class FreemarkerRender extends FreemarkerEngine implements Renderer {
044
045    public FreemarkerRender() {
046        setResourceLocator(new ResourceLocator() {
047            @Override
048            public URL getResourceURL(String key) {
049                try {
050                    if (key.startsWith(Renderer.TEMPLATE_PREFIX)) {
051                        return Framework.getService(ResourceService.class).getResource(
052                                key.substring(Renderer.TEMPLATE_PREFIX.length()));
053                    } else {
054                        return new URL(key);
055                    }
056                } catch (MalformedURLException e) {
057                    return null;
058                }
059            }
060
061            @Override
062            public File getResourceFile(String key) {
063                return null;
064            }
065        });
066    }
067
068    public void renderContent(String content, Object ctx, Writer writer) throws IOException, TemplateException {
069        StringReader reader = new StringReader(content);
070        Template tpl = new Template("@inline", reader, getConfiguration(), "UTF-8");
071        Environment env = tpl.createProcessingEnvironment(ctx, writer, getObjectWrapper());
072        env.process();
073    }
074
075    @Override
076    public String render(String uriOrContent, Map<String, Object> root) throws RenderingException, TemplateException,
077            IOException {
078        if (root.get("Document") != null) {
079            // mvel wrapper not supported in freemarker
080            root.put("Document", root.get("This"));
081        }
082        StringWriter result = new StringWriter();
083        if (uriOrContent.startsWith(Renderer.TEMPLATE_PREFIX)) {
084            render(uriOrContent, root, result);
085        } else {
086            renderContent(uriOrContent, root, result);
087        }
088        return result.getBuffer().toString();
089    }
090}