Examples with CSimpleGeneratedCode org.apache.camel.language.csimple.CSimpleGeneratedCode used on opensource projects

Example 1 with CSimpleGeneratedCode

use of org.apache.camel.language.csimple.CSimpleGeneratedCode in project camel-quarkus by apache.

the class CSimpleProcessor method compileCSimpleExpressions.

@BuildStep
void compileCSimpleExpressions(List<CSimpleExpressionSourceBuildItem> expressionSources, BuildProducer<CompiledCSimpleExpressionBuildItem> compiledCSimpleExpression, BuildProducer<GeneratedClassBuildItem> generatedClasses) throws IOException {
    if (!expressionSources.isEmpty()) {
        final Set<String> imports = new TreeSet<>();
        final Map<String, String> aliases = new LinkedHashMap<>();
        final ClassLoader loader = Thread.currentThread().getContextClassLoader();
        if (!(loader instanceof QuarkusClassLoader)) {
            throw new IllegalStateException(QuarkusClassLoader.class.getSimpleName() + " expected as the context class loader");
        }
        final QuarkusClassLoader quarkusClassLoader = (QuarkusClassLoader) loader;
        readConfig(imports, aliases, loader);
        final CSimpleCodeGenerator generator = new CSimpleCodeGenerator();
        generator.setAliases(aliases);
        generator.setImports(imports);
        final Path projectDir = Paths.get(".").toAbsolutePath().normalize();
        final Path csimpleGeneratedSourceDir = projectDir.resolve("target/generated/csimple");
        Files.createDirectories(csimpleGeneratedSourceDir);
        final Set<File> filesToCompile = new LinkedHashSet<>();
        /* We do not want to compile the same source twice, so we store here what we have compiled already */
        final Map<Boolean, Set<String>> compiledExpressions = new HashMap<>();
        compiledExpressions.put(true, new HashSet<>());
        compiledExpressions.put(false, new HashSet<>());
        /* Generate Java classes for the language expressions */
        for (CSimpleExpressionSourceBuildItem expr : expressionSources) {
            final boolean predicate = expr.isPredicate();
            final String script = expr.getSourceCode();
            if (!compiledExpressions.get(predicate).contains(script)) {
                final CSimpleGeneratedCode code = predicate ? generator.generatePredicate(expr.getClassNameBase(), script) : generator.generateExpression(expr.getClassNameBase(), script);
                compiledCSimpleExpression.produce(new CompiledCSimpleExpressionBuildItem(code.getCode(), predicate, code.getFqn()));
                final Path javaCsimpleFile = csimpleGeneratedSourceDir.resolve(code.getFqn().replace('.', '/') + ".java");
                Files.createDirectories(javaCsimpleFile.getParent());
                Files.write(javaCsimpleFile, code.getCode().getBytes(StandardCharsets.UTF_8));
                filesToCompile.add(javaCsimpleFile.toFile());
                compiledExpressions.get(predicate).add(script);
            }
        }
        final Path csimpleClassesDir = projectDir.resolve("target/csimple-classes");
        Files.createDirectories(csimpleClassesDir);
        /* Compile the generated sources */
        try (JavaCompilationProvider compiler = new JavaCompilationProvider()) {
            final Context context = compilationContext(projectDir, csimpleClassesDir, quarkusClassLoader);
            compiler.compile(filesToCompile, context);
        }
        /* Register the compiled classes via Quarkus GeneratedClassBuildItem */
        try (Stream<Path> classFiles = Files.walk(csimpleClassesDir)) {
            classFiles.filter(Files::isRegularFile).filter(p -> p.getFileName().toString().endsWith(CLASS_EXT)).forEach(p -> {
                final Path relPath = csimpleClassesDir.relativize(p);
                String className = FileUtils.nixifyPath(relPath.toString());
                className = className.substring(0, className.length() - CLASS_EXT.length());
                try {
                    final GeneratedClassBuildItem item = new GeneratedClassBuildItem(true, className, Files.readAllBytes(p));
                    generatedClasses.produce(item);
                } catch (IOException e) {
                    throw new RuntimeException("Could not read " + p);
                }
            });
        }
    }
}