content: /*
   * 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 org.apache.asterix.testframework.template;
  
  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.asterix.testframework.datagen.LoremIpsumReplacement;
  import org.apache.asterix.testframework.datagen.TemplateReplacement;
  
  public class TemplateHelper {
  
      private final Map<String, TemplateReplacement> replacements = new HashMap<>();
      private final Pattern replacementPattern;
  
      public static final TemplateHelper INSTANCE = new TemplateHelper();
  
      private TemplateHelper() {
          registerReplacement(LoremIpsumReplacement.INSTANCE);
          StringBuilder pattern = new StringBuilder();
          replacements.forEach((key, value) -> {
              if (pattern.length() == 0) {
                  pattern.append("%(");
              } else {
                  pattern.append("|");
              }
              pattern.append(key);
          });
          pattern.append(")[^%]*%");
          replacementPattern = Pattern.compile(pattern.toString());
      }
  
      private void registerReplacement(TemplateReplacement replacement) {
          replacements.put(replacement.tag(), replacement);
      }
  
      public File resolveTemplateFile(File inputFile) throws IOException {
          File outputFile = File.createTempFile("template.",
                  "." + inputFile.getName().substring(0, inputFile.getName().lastIndexOf(".template")));
          outputFile.deleteOnExit();
          processFile(inputFile, outputFile);
          return outputFile;
      }
  
      public void processFile(File inputFile, File outputFile) throws IOException {
          synchronized (this) {
              outputFile.getParentFile().mkdirs();
          }
          try (BufferedReader reader = new BufferedReader(new FileReader(inputFile));
                  BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {
              String line;
              while ((line = reader.readLine()) != null) {
                  Matcher m = replacementPattern.matcher(line);
                  if (m.find()) {
                      writer.write(line, 0, m.start());
                      replacements.get(m.group(1)).appendReplacement(m.group(0), writer);
                      writer.write(line, m.end(), line.length() - m.end());
                      writer.newLine();
                  } else {
                      writer.write(line + "\n");
                  }
              }
          }
      }
  }
  