com.glaf.template.renderer.freemarker.FreemarkerRenderer.java Source code

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Here is the source code for com.glaf.template.renderer.freemarker.FreemarkerRenderer.java

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/*
* 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 com.glaf.template.renderer.freemarker;

import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.glaf.template.Template;
import com.glaf.template.engine.FreemarkerTemplateEngine;
import com.glaf.template.renderer.Renderer;

public class FreemarkerRenderer implements Renderer {

    private final static Log log = LogFactory.getLog(FreemarkerRenderer.class);

    private Template renderTemplate = null;

    private freemarker.template.Template t = null;

    private Exception parseException = null;

    public FreemarkerRenderer(Template template) throws Exception {
        this.renderTemplate = template;
        try {
            t = FreemarkerTemplateEngine.getTemplate(template, "UTF-8");
        } catch (Exception ex) {
            log.error("Unknown exception creatting renderer for " + template.getTemplateId(), ex);
            throw ex;
        }
    }

    public void render(Map<String, Object> model, Writer out) {
        try {
            if (parseException != null) {
                Map<String, Object> context = new java.util.HashMap<String, Object>();
                context.put("exception", parseException);
                context.put("exceptionSource", renderTemplate.getTemplateId());
                t.process(context, out);
                return;
            }
            model.put("currentDate", new java.util.Date());
            log.debug(model);
            StringWriter writer = new StringWriter();
            long startTime = System.currentTimeMillis();
            t.process(model, writer);
            writer.flush();
            writer.close();
            out.write(writer.toString());
            long endTime = System.currentTimeMillis();
            long renderTime = (endTime - startTime);
            log.debug("Rendered [" + renderTemplate.getTemplateId() + "] in " + renderTime + " milliseconds");
            // log.debug(out.toString());
        } catch (Exception ex) {
            throw new RuntimeException("Error during rendering", ex);
        }
    }

}