code: /*
   * citygml-tools - Collection of tools for processing CityGML files
   * https://github.com/citygml4j/citygml-tools
   *
   * citygml-tools is part of the citygml4j project
   *
   * Copyright 2018-2023 Claus Nagel <claus.nagel@gmail.com>
   *
   * 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.citygml4j.tools.command;
  
  import org.citygml4j.tools.ExecutionException;
  import org.citygml4j.tools.option.CityGMLOutputOptions;
  import org.citygml4j.tools.option.CityGMLOutputVersion;
  import org.citygml4j.tools.option.InputOptions;
  import org.citygml4j.tools.option.OverwriteInputOption;
  import org.citygml4j.tools.util.InputFiles;
  import org.citygml4j.xml.reader.ChunkOptions;
  import org.citygml4j.xml.reader.CityGMLInputFactory;
  import org.citygml4j.xml.reader.CityGMLReadException;
  import org.citygml4j.xml.reader.CityGMLReader;
  import org.citygml4j.xml.transform.TransformerPipeline;
  import org.citygml4j.xml.writer.CityGMLChunkWriter;
  import org.citygml4j.xml.writer.CityGMLOutputFactory;
  import org.citygml4j.xml.writer.CityGMLWriteException;
  import picocli.CommandLine;
  
  import javax.xml.transform.Source;
  import javax.xml.transform.TransformerConfigurationException;
  import javax.xml.transform.stream.StreamSource;
  import java.nio.file.Path;
  import java.util.Arrays;
  import java.util.List;
  
  @CommandLine.Command(name = "apply-xslt",
          description = "Transforms city objects based on XSLT stylesheets.")
  public class ApplyXSLTCommand extends CityGMLTool {
      @CommandLine.Option(names = {"-x", "--xslt"}, split = ",", paramLabel = "<file>", required = true,
              description = "One or more XSLT 1.0 stylesheets to use to transform the individual top-level city " +
                      "objects in the input file(s). The stylesheets are applied in the given order.")
      private Path[] stylesheets;
  
      @CommandLine.Mixin
      private CityGMLOutputVersion version;
  
      @CommandLine.Mixin
      private CityGMLOutputOptions outputOptions;
  
      @CommandLine.Mixin
      OverwriteInputOption overwriteOption;
  
      @CommandLine.Mixin
      private InputOptions inputOptions;
  
      private final String suffix = "__transformed";
  
      @Override
      public Integer call() throws ExecutionException {
          log.debug("Searching for CityGML input files.");
          List<Path> inputFiles = InputFiles.of(inputOptions.getFiles())
                  .withFilter(path -> !stripFileExtension(path).endsWith(suffix))
                  .find();
  
          if (inputFiles.isEmpty()) {
              log.warn("No files found at " + inputOptions.joinFiles() + ".");
              return CommandLine.ExitCode.OK;
          }
  
          log.info("Found " + inputFiles.size() + " file(s) at " + inputOptions.joinFiles() + ".");
  
          CityGMLInputFactory in = createCityGMLInputFactory().withChunking(ChunkOptions.defaults());
          CityGMLOutputFactory out = createCityGMLOutputFactory(version.getVersion());
  
          try {
              out.withTransformer(TransformerPipeline.newInstance(Arrays.stream(stylesheets)
                      .map(path -> new StreamSource(path.toFile()))
                      .toArray(Source[]::new)));
          } catch (TransformerConfigurationException e) {
              throw new ExecutionException("Failed to read XSLT stylesheet.", e);
          }
  
          for (int i = 0; i < inputFiles.size(); i++) {
              Path inputFile = inputFiles.get(i);
              Path outputFile = getOutputFile(inputFile, suffix, overwriteOption.isOverwrite());
  
              log.info("[" + (i + 1) + "|" + inputFiles.size() + "] Processing file " + inputFile.toAbsolutePath() + ".");
  
              try (CityGMLReader reader = createCityGMLReader(in, inputFile, inputOptions)) {
                  if (!version.isSetVersion()) {
                      setCityGMLVersion(reader, out);
                  }
  
                  if (overwriteOption.isOverwrite()) {
                      log.debug("Writing temporary output file " + outputFile.toAbsolutePath() + ".");
                  } else {
                      log.info("Writing output to file " + outputFile.toAbsolutePath() + ".");
                  }
  
                  try (CityGMLChunkWriter writer = createCityGMLChunkWriter(out, outputFile, outputOptions)
                          .withCityModelInfo(getFeatureInfo(reader))) {
                      log.debug("Reading and transforming city objects using the specified XSLT stylesheet(s).");
                      while (reader.hasNext()) {
                          writer.writeMember(reader.next());
                      }
                  }
              } catch (CityGMLReadException e) {
                  throw new ExecutionException("Failed to read file " + inputFile.toAbsolutePath() + ".", e);
              } catch (CityGMLWriteException e) {
                  throw new ExecutionException("Failed to write file " + outputFile.toAbsolutePath() + ".", e);
              }
  
              if (overwriteOption.isOverwrite()) {
                  log.debug("Replacing input file with temporary output file.");
                  replaceInputFile(inputFile, outputFile);
              }
          }
  
          return CommandLine.ExitCode.OK;
      }
  }
  