| /* |
| 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.plc4x.plugins.codegenerator; |
| |
| import freemarker.core.ParseException; |
| import freemarker.template.*; |
| import org.apache.maven.artifact.DependencyResolutionRequiredException; |
| import org.apache.maven.plugin.AbstractMojo; |
| import org.apache.maven.plugin.MojoExecutionException; |
| import org.apache.maven.plugins.annotations.LifecyclePhase; |
| import org.apache.maven.plugins.annotations.Mojo; |
| import org.apache.maven.plugins.annotations.Parameter; |
| import org.apache.maven.plugins.annotations.ResolutionScope; |
| import org.apache.maven.project.MavenProject; |
| import org.dom4j.*; |
| import org.dom4j.io.SAXReader; |
| |
| import java.io.*; |
| import java.nio.charset.StandardCharsets; |
| import java.nio.file.Files; |
| import java.util.*; |
| |
| /** |
| * Generate the types, serializer and parser classes based on a DFDL shema. |
| */ |
| @Mojo(name = "generate-driver", |
| defaultPhase = LifecyclePhase.GENERATE_SOURCES, |
| requiresDependencyResolution = ResolutionScope.RUNTIME) |
| public class GenerateMojo extends AbstractMojo { |
| |
| private static final Namespace xsNamespace = new Namespace("xs", "http://www.w3.org/2001/XMLSchema"); |
| private static final QName complexType = new QName("complexType", xsNamespace); |
| |
| |
| @Parameter(defaultValue = "${project}", readonly = true, required = true) |
| private MavenProject project; |
| |
| /** |
| * Where to generate the code. |
| */ |
| @Parameter(defaultValue = "${project.build.directory}/generated-sources/plc4x/", required = true) |
| private File outputDir; |
| |
| /** |
| * The path to the DFDL schema file in the modules classpath (Ideally as runtime dependency) |
| */ |
| @Parameter(required = true) |
| private String dfdlSchema; |
| |
| @Parameter(required = true) |
| private List<String> templates; |
| |
| @Parameter(required = true) |
| private String packageName; |
| |
| public void execute() |
| throws MojoExecutionException { |
| |
| // Make sure the output directory exists. |
| if (!outputDir.exists()) { |
| if (!outputDir.mkdirs()) { |
| throw new MojoExecutionException("Could not generate output directory " + outputDir.getAbsolutePath()); |
| } |
| } |
| |
| try { |
| // Configure the Freemarker template engine |
| Configuration freemarkerConfiguration = getFreemarkerConfiguration(); |
| |
| // Initialize all templates |
| List<Template> templateList = new ArrayList<>(this.templates.size()); |
| for(String templateName : templates) { |
| templateList.add(freemarkerConfiguration.getTemplate(templateName)); |
| } |
| |
| // Try to find a schema file in one of the following locations: |
| // - The absolute path the dfdlSchema property references |
| // - Any directories in the classpath (usually target/classes) |
| // - Any jar in the classpath |
| File schemaFile = new File(dfdlSchema); |
| if(!schemaFile.exists()) { |
| for (String runtimeClasspathElement : project.getRuntimeClasspathElements()) { |
| File classPathElement = new File(runtimeClasspathElement); |
| if (classPathElement.exists()) { |
| // This is usually the "target/classes" directory. |
| if (classPathElement.isDirectory()) { |
| schemaFile = new File(classPathElement, dfdlSchema); |
| if (schemaFile.exists()) { |
| break; |
| } |
| } |
| // These are usually jar files. |
| else { |
| // TODO: Implement ... |
| } |
| } |
| } |
| } |
| |
| if(!schemaFile.exists()) { |
| throw new MojoExecutionException("Unable to find 'dfdl-schema' at" + dfdlSchema); |
| } |
| |
| // Load the DFDL schema file |
| Document dfdlSchema = parseDFDLSchema(schemaFile); |
| |
| // Get the list of main types in the schema file (complexType and root level) |
| Iterator<Element> types = getMainTypes(dfdlSchema); |
| |
| // Iterate over the types and have content generated for each one |
| while (types.hasNext()){ |
| Element typeElement = types.next(); |
| String typeName = typeElement.attributeValue("name"); |
| |
| // Prepare a new generation context |
| Map<String, Object> typeContext = new HashMap<>(); |
| typeContext.put("typeName", typeName); |
| typeContext.put("typeElement", typeElement); |
| typeContext.put("packageName", packageName); |
| |
| for(Template template : templateList) { |
| // Create a variable size output location where the template can generate it's content to |
| ByteArrayOutputStream output = new ByteArrayOutputStream(); |
| |
| // Have Freemarker generate the output |
| template.process(typeContext, new OutputStreamWriter(output)); |
| |
| // Create the means to read in the generated output back in again |
| BufferedReader input = new BufferedReader( |
| new InputStreamReader(new ByteArrayInputStream(output.toByteArray()))); |
| |
| // Extract the output path from the first line of the generated content |
| String outputFileName = input.readLine(); |
| File outputFile = new File(outputDir, outputFileName); |
| |
| // Create any missing directories |
| if(!outputFile.getParentFile().exists()) { |
| if(!outputFile.getParentFile().mkdirs()) { |
| throw new MojoExecutionException( |
| "Unable to create output directory " + outputFile.getParent()); |
| } |
| } |
| |
| // Output the rest to that file |
| BufferedWriter outputFileWriter = Files.newBufferedWriter( |
| outputFile.toPath(), StandardCharsets.UTF_8); |
| String line; |
| while ((line = input.readLine()) != null) { |
| outputFileWriter.write(line); |
| outputFileWriter.newLine(); |
| } |
| } |
| getLog().info("Generating type " + typeName); |
| } |
| } catch (DependencyResolutionRequiredException e) { |
| throw new MojoExecutionException("Error resolving dependencies", e); |
| } catch (TemplateNotFoundException | TemplateException | MalformedTemplateNameException | ParseException e) { |
| throw new MojoExecutionException("Error resolving template", e); |
| } catch (IOException e) { |
| throw new MojoExecutionException("Error generating sources", e); |
| } |
| } |
| |
| private Configuration getFreemarkerConfiguration() throws MojoExecutionException { |
| Configuration configuration = new Configuration(Configuration.VERSION_2_3_28); |
| configuration.setDefaultEncoding("UTF-8"); |
| configuration.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER); |
| configuration.setLogTemplateExceptions(false); |
| configuration.setWrapUncheckedExceptions(true); |
| try { |
| configuration.setDirectoryForTemplateLoading(new File("/")); |
| } catch (IOException e) { |
| throw new MojoExecutionException("Error initializing freemarker configuration"); |
| } |
| return configuration; |
| } |
| |
| private Document parseDFDLSchema(File schemaFile) throws MojoExecutionException { |
| try { |
| SAXReader reader = new SAXReader(); |
| return reader.read(schemaFile); |
| } catch (DocumentException e) { |
| throw new MojoExecutionException("Unable to parse DFDL schema at " + schemaFile.getAbsolutePath(), e); |
| } |
| } |
| |
| private Iterator<Element> getMainTypes(Document dfdlSchema) { |
| Element rootElement = dfdlSchema.getRootElement(); |
| return rootElement.elementIterator(complexType); |
| } |
| |
| } |