2 files changed, 103 insertions, 0 deletions
diff --git a/src/main/java/ftbsc/lll/mapper/writer/IWriter.java b/src/main/java/ftbsc/lll/mapper/writer/IWriter.java
new file mode 100644
index 0000000..13244a9
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/writer/IWriter.java
@@ -0,0 +1,23 @@
+package ftbsc.lll.mapper.writer;
+
+import ftbsc.lll.mapper.IMapper;
+
+import java.io.PrintWriter;
+
+/**
+ * The common interface for all mapping writers.
+ */
+public interface IWriter {
+	
+	/**
+	 * @return a unique identifier for this writer
+	 */
+	String uniqueId();
+
+	/**
+	 * Writes in a {@link PrintWriter} the contents of a {@link IMapper}.
+	 * @param mapper the mapper
+	 * @param writer the writer
+	 */
+	void write(IMapper mapper, PrintWriter writer);
+}
diff --git a/src/main/java/ftbsc/lll/mapper/writer/MappingWriter.java b/src/main/java/ftbsc/lll/mapper/writer/MappingWriter.java
new file mode 100644
index 0000000..f5f7b10
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/writer/MappingWriter.java
@@ -0,0 +1,80 @@
+package ftbsc.lll.mapper.writer;
+
+import ftbsc.lll.mapper.IMapper;
+import ftbsc.lll.mapper.MapperProvider;
+import org.apache.commons.cli.*;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+
+/**
+ * Writes a mapping to a certain format.
+ */
+public class MappingWriter {
+
+	/**
+	 * The main function, must be passed exactly two arguments
+	 * @param args the command line arguments
+	 * @throws IOException if something goes wrong
+	 */
+	public static void main(String[] args) throws IOException, ParseException {
+		try {
+			Options options = new Options()
+				.addOption("r", "reverse", false, "Writes down inverted mappings");
+			DefaultParser parser = new DefaultParser();
+			CommandLine cmdLine = parser.parse(options, args);
+			args = cmdLine.getArgs();
+
+			if(args.length != 3) {
+				System.err.println("Bad argument count!");
+				System.err.println("java -jar mapping-writer.jar [-r] <location> <format> <output>");
+				return;
+			}
+
+			//load the mapper
+			List<String> lines = MapperProvider.fetchFromLocalOrRemote(args[0]);
+			IMapper mapper = MapperProvider.getMapper(lines);
+			mapper.populate(lines, false);
+			if(cmdLine.hasOption("reverse"))
+				mapper = mapper.getInverted();
+
+			//load the writers
+			Map<String, IWriter> writerMap = new HashMap<>();
+			for(IWriter w : ServiceLoader.load(IWriter.class))
+				writerMap.put(w.uniqueId(), w);
+
+			//get the one we need
+			IWriter writer = writerMap.get(args[1]);
+			if(writer == null) {
+				System.err.printf("%s was not recognised as a valid format!", args[1]);
+				return;
+			}
+
+			//now for the file
+			File targetFile = new File(args[2]);
+
+			if(!targetFile.createNewFile()) {
+				System.out.println("File already exists!");
+				return;
+			}
+
+			if(!targetFile.canWrite()) {
+				System.out.println("Failed to write to file: access denied.");
+				return;
+			}
+
+			//call the writer
+			PrintWriter printWriter = new PrintWriter(new FileWriter(targetFile));
+			writer.write(mapper, printWriter);
+			printWriter.close();
+		} catch(ParseException ex) {
+			ex.printStackTrace();
+		}
+	}
+}