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Add JavaCompilerUtility and deprecate JavaCompilerUtil
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test-utils-core/src/main/java/uk/gov/justice/services/test/utils/core/compiler/Compiler.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,114 @@ | ||
| package uk.gov.justice.services.test.utils.core.compiler; | ||
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| import static java.text.MessageFormat.format; | ||
| import static java.util.Arrays.stream; | ||
| import static java.util.stream.Collectors.toList; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.util.Arrays; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Locale; | ||
| import java.util.stream.Stream; | ||
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| import javax.tools.Diagnostic; | ||
| import javax.tools.DiagnosticCollector; | ||
| import javax.tools.JavaCompiler; | ||
| import javax.tools.JavaFileObject; | ||
| import javax.tools.StandardJavaFileManager; | ||
| import javax.tools.ToolProvider; | ||
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| import org.apache.commons.io.FileUtils; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| public class Compiler { | ||
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| private static final Logger LOGGER = LoggerFactory.getLogger(Compiler.class); | ||
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| private final JavaCompiler javaCompiler; | ||
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| public Compiler() { | ||
| this.javaCompiler = ToolProvider.getSystemJavaCompiler(); | ||
| } | ||
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| public void compile(final File codegenOutputDir, final File compilationOutputDir) { | ||
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| final DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>(); | ||
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| try (final StandardJavaFileManager fileManager = javaCompiler.getStandardFileManager(diagnostics, Locale.getDefault(), null)) { | ||
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| final List<JavaFileObject> javaObjects = scanForJavaObjects(codegenOutputDir, fileManager); | ||
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| if (javaObjects.isEmpty()) { | ||
| throw new CompilationException( | ||
| format("There are no source files to compile in {0}", codegenOutputDir.getAbsolutePath())); | ||
| } | ||
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| final String[] compileOptions = new String[]{"-d", compilationOutputDir.getAbsolutePath()}; | ||
| final Iterable<String> compilationOptions = Arrays.asList(compileOptions); | ||
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| final JavaCompiler.CompilationTask compilerTask = javaCompiler.getTask(null, fileManager, diagnostics, compilationOptions, null, | ||
| javaObjects); | ||
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| if (!compilerTask.call()) { | ||
| for (Diagnostic<?> diagnostic : diagnostics.getDiagnostics()) { | ||
| LOGGER.error("Error on line {} in {}", diagnostic.getLineNumber(), diagnostic); | ||
| } | ||
| throw new CompilationException("Could not compile project"); | ||
| } | ||
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| } catch (final IOException e) { | ||
| throw new CompilationException("Could not compile project", e); | ||
| } | ||
| } | ||
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| private List<JavaFileObject> scanForJavaObjects(final File dir, final StandardJavaFileManager fileManager) { | ||
| return scanRecursivelyForJavaObjects(dir, fileManager).collect(toList()); | ||
| } | ||
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| private Stream<JavaFileObject> scanRecursivelyForJavaObjects(final File dir, final StandardJavaFileManager fileManager) { | ||
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| final File[] fileList = dir.listFiles(); | ||
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| if (null == fileList) { | ||
| return Stream.empty(); | ||
| } | ||
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| return stream(fileList) | ||
| .flatMap(file -> processFileForJavaObjects(fileManager, file)); | ||
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| } | ||
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| private Stream<? extends JavaFileObject> processFileForJavaObjects(final StandardJavaFileManager fileManager, final File file) { | ||
| if (file.isDirectory()) { | ||
| return scanRecursivelyForJavaObjects(file, fileManager); | ||
| } else if (file.isFile() && file.getName().toLowerCase().endsWith(".java")) { | ||
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| try { | ||
| FileUtils.readFileToString(file); | ||
| } catch (final IOException e) { | ||
| LOGGER.warn("Could not read file : {0}", file.getAbsolutePath(), e); | ||
| } | ||
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| return readJavaObjects(file, fileManager); | ||
| } | ||
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| return Stream.empty(); | ||
| } | ||
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| private Stream<JavaFileObject> readJavaObjects(final File file, final StandardJavaFileManager fileManager) { | ||
| final Iterator<? extends JavaFileObject> javaFileObjects = fileManager.getJavaFileObjects(file).iterator(); | ||
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| if (!javaFileObjects.hasNext()) { | ||
| throw new CompilationException(format("Could not load {0} java file object", file.getAbsolutePath())); | ||
| } | ||
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| final Stream.Builder<JavaFileObject> builder = Stream.builder(); | ||
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| javaFileObjects.forEachRemaining(o -> builder.accept(o)); | ||
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| return builder.build(); | ||
| } | ||
| } |
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