[MCHECKSTYLE-449] Add support for SARIF output format

This closes #136

Author: exiahuang

src/main/java/org/apache/maven/plugins/checkstyle/AbstractCheckstyleReport.java

@@ -31,6 +31,7 @@
 import java.util.Map;
 
 import com.puppycrawl.tools.checkstyle.DefaultLogger;
+import com.puppycrawl.tools.checkstyle.SarifLogger;
 import com.puppycrawl.tools.checkstyle.XMLLogger;
 import com.puppycrawl.tools.checkstyle.api.AuditListener;
 import com.puppycrawl.tools.checkstyle.api.AutomaticBean.OutputStreamOptions;
@@ -314,7 +315,7 @@ public abstract class AbstractCheckstyleReport extends AbstractMavenReport {
 
     /**
      * Specifies the format of the output to be used when writing to the output
-     * file. Valid values are "<code>plain</code>" and "<code>xml</code>".
+     * file. Valid values are "<code>plain</code>", "<code>sarif</code>" and "<code>xml</code>".
      */
     @Parameter(property = "checkstyle.output.format", defaultValue = "xml")
     private String outputFileFormat;
@@ -619,10 +620,16 @@ protected AuditListener getListener() throws MavenReportException {
                 listener = new XMLLogger(out, OutputStreamOptions.CLOSE);
             } else if ("plain".equals(outputFileFormat)) {
                 listener = new DefaultLogger(out, OutputStreamOptions.CLOSE);
+            } else if ("sarif".equals(outputFileFormat)) {
+                try {
+                    listener = new SarifLogger(out, OutputStreamOptions.CLOSE);
+                } catch (IOException e) {
+                    throw new MavenReportException("Failed to create SarifLogger", e);
+                }
             } else {
                 // TODO: failure if not a report
                 throw new MavenReportException(
-                        "Invalid output file format: (" + outputFileFormat + "). Must be 'plain' or 'xml'.");
+                        "Invalid output file format: (" + outputFileFormat + "). Must be 'plain', 'sarif' or 'xml'.");
             }
         }
 

src/main/java/org/apache/maven/plugins/checkstyle/CheckstyleViolationCheckMojo.java

@@ -34,6 +34,7 @@
 import java.util.Map;
 
 import com.puppycrawl.tools.checkstyle.DefaultLogger;
+import com.puppycrawl.tools.checkstyle.SarifLogger;
 import com.puppycrawl.tools.checkstyle.XMLLogger;
 import com.puppycrawl.tools.checkstyle.api.AuditListener;
 import com.puppycrawl.tools.checkstyle.api.AutomaticBean.OutputStreamOptions;
@@ -92,7 +93,7 @@ public class CheckstyleViolationCheckMojo extends AbstractMojo {
 
     /**
      * Specifies the format of the output to be used when writing to the output
-     * file. Valid values are "<code>plain</code>" and "<code>xml</code>".
+     * file. Valid values are "<code>plain</code>", "<code>sarif</code>" and "<code>xml</code>".
      */
     @Parameter(property = "checkstyle.output.format", defaultValue = "xml")
     private String outputFileFormat;
@@ -802,6 +803,21 @@ private AuditListener getListener() throws MojoFailureException, MojoExecutionEx
                 } catch (IOException e) {
                     throw new MojoExecutionException("Unable to create temporary file", e);
                 }
+            } else if ("sarif".equals(outputFileFormat)) {
+                try {
+                    // Write a sarif output file to the standard output file,
+                    // and write an XML output file to the temp directory that can be used to count violations
+                    outputXmlFile =
+                            Files.createTempFile("checkstyle-result", ".xml").toFile();
+                    outputXmlFile.deleteOnExit();
+                    OutputStream xmlOut = getOutputStream(outputXmlFile);
+                    CompositeAuditListener compoundListener = new CompositeAuditListener();
+                    compoundListener.addListener(new XMLLogger(xmlOut, OutputStreamOptions.CLOSE));
+                    compoundListener.addListener(new SarifLogger(out, OutputStreamOptions.CLOSE));
+                    listener = compoundListener;
+                } catch (IOException e) {
+                    throw new MojoExecutionException("Unable to create temporary file", e);
+                }
             } else {
                 throw new MojoFailureException(
                         "Invalid output file format: (" + outputFileFormat + "). Must be 'plain' or 'xml'.");