Migrate TrangPlugin groovy->java

Issue: gh-4939

Author: larsgrefer

buildSrc/src/main/groovy/trang/TrangPlugin.groovy

@@ -0,0 +1,83 @@
+package trang;
+
+import com.thaiopensource.relaxng.translate.Driver;
+import net.sf.saxon.TransformerFactoryImpl;
+import org.gradle.api.DefaultTask;
+import org.gradle.api.tasks.InputDirectory;
+import org.gradle.api.tasks.InputFile;
+import org.gradle.api.tasks.OutputDirectory;
+import org.gradle.api.tasks.TaskAction;
+
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+
+/**
+ * Converts .rnc files to .xsd files using trang and then applies an xsl file to cleanup the results.
+ */
+public class RncToXsd extends DefaultTask {
+
+	private File rncDir;
+
+	private File xslFile;
+
+	private File xsdDir;
+
+	@InputDirectory
+	public File getRncDir() {
+		return rncDir;
+	}
+
+	public void setRncDir(File rncDir) {
+		this.rncDir = rncDir;
+	}
+
+	@InputFile
+	public File getXslFile() {
+		return xslFile;
+	}
+
+	public void setXslFile(File xslFile) {
+		this.xslFile = xslFile;
+	}
+
+	@OutputDirectory
+	public File getXsdDir() {
+		return xsdDir;
+	}
+
+	public void setXsdDir(File xsdDir) {
+		this.xsdDir = xsdDir;
+	}
+
+	@TaskAction
+	public final void transform() throws IOException, TransformerException {
+		String xslPath = xslFile.getAbsolutePath();
+
+		File[] files = rncDir.listFiles((dir, file) -> file.endsWith(".rnc"));
+		if(files != null) {
+			for (File rncFile : files) {
+				File xsdFile = new File(xsdDir, rncFile.getName().replace(".rnc", ".xsd"));
+				String xsdOutputPath = xsdFile.getAbsolutePath();
+
+				new Driver().run(new String[]{rncFile.getAbsolutePath(), xsdOutputPath});
+
+				TransformerFactory tFactory = new TransformerFactoryImpl();
+				Transformer transformer = tFactory.newTransformer(new StreamSource(xslPath));
+
+				File temp = File.createTempFile("gradle-trang-" + xsdFile.getName(), ".xsd");
+
+				Files.copy(xsdFile.toPath(), temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
+				StreamSource xmlSource = new StreamSource(temp);
+				transformer.transform(xmlSource, new StreamResult(xsdFile));
+				temp.delete();
+			}
+		}
+	}
+}

buildSrc/src/main/java/trang/RncToXsd.java

@@ -0,0 +1,18 @@
+package trang;
+
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.Task;
+
+/**
+ * Used for converting .rnc files to .xsd files.
+ * @author Rob Winch
+ */
+public class TrangPlugin implements Plugin<Project> {
+	@Override
+	public void apply(Project project) {
+		Task rncToXsd = project.getTasks().create("rncToXsd", RncToXsd.class);
+		rncToXsd.setDescription("Converts .rnc to .xsd");
+		rncToXsd.setGroup("Build");
+	}
+}