Return validation results as text/csv on request :-)

src/main/java/org/genesys/taxonomy/checker/web/controller/ValidatorController.java

@@ -16,10 +16,13 @@
 package org.genesys.taxonomy.checker.web.controller;
 
 import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.io.StringReader;
 import java.text.ParseException;
 import java.util.List;
 
+import javax.servlet.http.HttpServletResponse;
+
 import org.apache.commons.lang3.StringUtils;
 import org.genesys.taxonomy.checker.TaxonomyException;
 import org.genesys.taxonomy.checker.web.service.ProcessService;
@@ -33,6 +36,8 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RequestParam;
 
+import com.opencsv.CSVWriter;
+
 /**
  * The controller
  *
@@ -97,6 +102,51 @@ public class ValidatorController {
 		return "result";
 	}
 
+	/**
+	 * Process string.
+	 *
+	 * @param separator the separator
+	 * @param quoteChar the quote char
+	 * @param escapeChar the escape char
+	 * @param csvText the csv text
+	 * @param toCurrentTaxa the to current taxa
+	 * @param model the model
+	 * @return the string
+	 * @throws IOException Signals that an I/O exception has occurred.
+	 * @throws ParseException the parse exception
+	 * @throws TaxonomyException the taxonomy exception
+	 */
+	@RequestMapping(value = "process", method = RequestMethod.POST, params = "csvText", produces = "text/csv")
+	public void processStringToCSV(@RequestParam(name = "separator", required = false, defaultValue = ",") final Character separator,
+			@RequestParam(name = "separatorOther", required = false, defaultValue = "") final Character separatorOther,
+			@RequestParam(name = "quoteChar", required = false, defaultValue = "\"") final Character quoteChar,
+			@RequestParam(name = "escapeChar", required = false, defaultValue = "\0") final Character escapeChar, 
+			@RequestParam(name = "csvText", required = true) final String csvText,
+			@RequestParam(name = "toCurrentTaxa", required = false) final Boolean toCurrentTaxa,
+			@RequestParam(name = "validateType", defaultValue = "") final String validateType,
+			@RequestParam(name = "decimalMark", defaultValue = ".") final Character decimalMark,
+			final HttpServletResponse response) throws IOException, ParseException, TaxonomyException {
+
+		LOG.trace("Processing uploaded CSV string:\n{}", csvText);
+
+		List<String[]> rows = processService.process(new StringReader(StringUtils.defaultString(csvText, "")), (separator == 'O' ? separatorOther : separator), quoteChar, escapeChar, validateType,
+				toCurrentTaxa, decimalMark);
+		
+		response.setContentType("text/csv;charset=UTF-16LE");
+		response.addHeader("Content-Disposition", String.format("attachment; filename=\"validator-results.csv\""));
+		response.flushBuffer();
+
+		// Write CSV to the stream.
+		final OutputStreamWriter osw = new OutputStreamWriter(response.getOutputStream(), "UTF-16LE");
+	
+		try (CSVWriter csvWriter=new CSVWriter(osw, (separator == 'O' ? separatorOther : separator), quoteChar, escapeChar, "\n")) {
+			csvWriter.writeAll(rows);
+			csvWriter.flush();
+		} finally {
+			response.flushBuffer();
+		}
+	}
+
 	private String[] getStyles(String[] strings) {
 		String[] styles = new String[strings.length];
 		for (int i = 0; i < strings.length; i++) {