/*
* [The "BSD licence"]
* Copyright (c) 2012 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.dandelion.datatables.core.generator;
import java.io.IOException;
import java.io.Writer;
import java.util.Map;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.dandelion.datatables.core.asset.JsResource;
import com.github.dandelion.datatables.core.exception.WebResourceGenerationException;
import com.github.dandelion.datatables.core.extension.ExtensionLoader;
import com.github.dandelion.datatables.core.generator.configuration.DatatablesGenerator;
import com.github.dandelion.datatables.core.html.HtmlTable;
import com.github.dandelion.datatables.core.util.JsonIndentingWriter;
/**
* <p>
* Class in charge of web resources generation.
*
* <p>
* The generated JSON (DataTables configuration) is pretty printed using a
* custom writer written by Elad Tabak.
*
* @author Thibault Duchateau
*/
public class WebResourceGenerator {
// Logger
private static Logger logger = LoggerFactory.getLogger(WebResourceGenerator.class);
private HtmlTable table;
/**
* The DataTables configuration generator.
*/
private static DatatablesGenerator configGenerator;
public WebResourceGenerator(HtmlTable table){
this.table = table;
}
/**
* <p>
* Main method which generated the web resources (js and css files).
*
* @param pageContext
* Context of the servlet.
* @param table
* Table from which the configuration is extracted.
* @return A string corresponding to the Javascript code to return to the
* JSP.
*/
public JsResource generateWebResources() {
/**
* Main configuration file building
*/
JsResource mainJsFile = new JsResource(table.getId(), table.getOriginalId());
// Init the "configuration" map with the table informations
// The configuration may be updated depending on the user's choices
configGenerator = new DatatablesGenerator();
Map<String, Object> mainConf = configGenerator.generateConfig(table);
/**
* Extension loading
*/
logger.debug("Loading extensions...");
ExtensionLoader extensionLoader = new ExtensionLoader(table);
extensionLoader.loadExtensions(mainJsFile, mainConf);
/**
* Main configuration generation
*/
logger.debug("Transforming configuration to JSON...");
// Allways pretty prints the JSON
try {
Writer writer = new JsonIndentingWriter();
JSONValue.writeJSONString(mainConf, writer);
mainJsFile.appendToDataTablesConf(writer.toString());
} catch (IOException e) {
throw new WebResourceGenerationException("Unable to generate the JSON configuration", e);
}
return mainJsFile;
}
}