| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // 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 com.google.enterprise.adaptor.examples; |
| |
| import com.google.enterprise.adaptor.AbstractDocumentTransform; |
| import com.google.enterprise.adaptor.Metadata; |
| import com.google.enterprise.adaptor.TransformException; |
| |
| import au.com.bytecode.opencsv.CSVReader; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.StringReader; |
| import java.nio.MappedByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.charset.Charset; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.logging.Logger; |
| |
| /** |
| * This transform takes in a CSV file, generates an HTML table with the data, |
| * and inserts it into a template HTML file that's provided by the user. |
| * In the template HTML file, place <code>&#0;</code> where you'd like the table |
| * to be inserted. |
| */ |
| public class TableGeneratorTransform extends AbstractDocumentTransform { |
| private static final Logger log = Logger.getLogger(TableGeneratorTransform.class.getName()); |
| |
| public TableGeneratorTransform() {} |
| |
| public TableGeneratorTransform(String templateFile) throws IOException { |
| loadTemplateFile(templateFile); |
| } |
| |
| @Override |
| public void transform(ByteArrayOutputStream contentIn, OutputStream contentOut, |
| Metadata metadata, Map<String, String> params) |
| throws TransformException, IOException { |
| String csv = contentIn.toString(); |
| List<String[]> records = new CSVReader(new StringReader(csv)).readAll(); |
| StringBuilder tableBuilder = new StringBuilder(); |
| if (!records.isEmpty()) { |
| tableBuilder.append("<table border=\"1\">\n"); |
| for (String[] record : records) { |
| tableBuilder.append("<tr>\n"); |
| for (String field : record) { |
| tableBuilder.append("<td>"); |
| tableBuilder.append(field); |
| tableBuilder.append("</td>\n"); |
| } |
| tableBuilder.append("</tr>\n"); |
| } |
| tableBuilder.append("</table>"); |
| } |
| String content = htmlTemplate.replace(SIGIL, tableBuilder.toString()); |
| contentOut.write(content.getBytes()); |
| } |
| |
| private void loadTemplateFile(String templateFile) throws IOException { |
| FileInputStream stream = new FileInputStream(new File(templateFile)); |
| try { |
| FileChannel fc = stream.getChannel(); |
| MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size()); |
| htmlTemplate = Charset.defaultCharset().decode(bb).toString(); |
| } finally { |
| stream.close(); |
| } |
| } |
| |
| private String htmlTemplate = "<HTML><HEAD></HEAD><BODY>" + SIGIL + "</BODY></HTML>"; |
| |
| /** |
| * This is the placeholder that gets replaced by the generated table. We use |
| * the escaped null character, because it is explicitly disallowed in HTML. |
| */ |
| private static final String SIGIL = "�"; |
| |
| public static TableGeneratorTransform create(Map<String, String> config) |
| throws IOException { |
| String templateFile = config.get("templateFile"); |
| TableGeneratorTransform transform; |
| if (templateFile == null) { |
| transform = new TableGeneratorTransform(); |
| } else { |
| transform = new TableGeneratorTransform(templateFile); |
| } |
| transform.configure(config); |
| return transform; |
| } |
| } |
