org.jnap.core.assets.HandlebarsAssetsHandler.java Source code

Introduction

Here is the source code for org.jnap.core.assets.HandlebarsAssetsHandler.java

Source

/*
 * LessAssetsHandler.java created on 2012-08-29
 *
 * Created by Brushing Bits Labs
 * http://www.brushingbits.org
 *
 * 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.jnap.core.assets;

import static java.text.MessageFormat.format;

import java.io.BufferedWriter;
import java.util.Set;
import java.util.TreeSet;

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.FileWriterWithEncoding;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.Resource;
import org.springframework.util.ClassUtils;
import org.springframework.web.context.support.ServletContextResource;

import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;

/**
 * @author Daniel Rochetti
 */
public class HandlebarsAssetsHandler extends StaticAssetsHandler {

    private boolean bindToBackboneView = true;

    @Override
    public void handle() {
        final Handlebars handlebars = new Handlebars();
        try {
            Resource[] resources = this.resourceResolver.getResources(source);
            Resource destRes = new ServletContextResource(servletContext, destination);
            resetResource(destRes);
            BufferedWriter writer = new BufferedWriter(
                    new FileWriterWithEncoding(destRes.getFile(), this.encoding, true));

            writer.write("(function() {");
            writer.write(IOUtils.LINE_SEPARATOR);
            writer.write("var template = Handlebars.template, ");
            writer.write("templates = Handlebars.templates = Handlebars.templates || {};");
            writer.write(IOUtils.LINE_SEPARATOR);
            final Set<String> templateNames = new TreeSet<String>();
            for (Resource resource : resources) {
                Template template = handlebars
                        .compile(StringUtils.trimToEmpty(IOUtils.toString(resource.getInputStream())));
                final String templateName = FilenameUtils.getBaseName(resource.getFilename());
                templateNames.add(templateName);
                writer.write("templates[\"" + templateName + "\"] = ");
                writer.write("template(");
                writer.write(template.toJavaScript());
                writer.write(");");
                writer.write(IOUtils.LINE_SEPARATOR);
            }

            writer.write(IOUtils.LINE_SEPARATOR);
            if (this.bindToBackboneView) {
                writer.write("$(function() {");
                writer.write(IOUtils.LINE_SEPARATOR);
                for (String templateName : templateNames) {
                    writer.write(format("if (window[\"{0}\"]) {0}.prototype.template " + "= templates[\"{0}\"];",
                            templateName));
                    writer.write(IOUtils.LINE_SEPARATOR);
                }
                writer.write("});");
                writer.write(IOUtils.LINE_SEPARATOR);
            }

            writer.write("})();");
            IOUtils.closeQuietly(writer);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected boolean shouldInit() {
        return super.shouldInit() && ClassUtils.isPresent("com.github.jknack.handlebars.Handlebars",
                this.getClass().getClassLoader());
    }

    public void setBindToBackboneView(boolean bindToBackboneView) {
        this.bindToBackboneView = bindToBackboneView;
    }

}