fix: combine SrcDir with sourcepath in FindbugsParser to produce complete file paths

violations-lib/src/main/java/se/bjurr/violations/lib/parsers/FindbugsParser.java

@@ -84,7 +84,8 @@ private Map<String, String> getMessagesPerType(
   private void parseBugInstance(
       final XMLStreamReader xmlr,
       final Set<Violation> violations,
-      final Map<String, String> messagesPerType)
+      final Map<String, String> messagesPerType,
+      final List<String> srcDirs)
       throws XMLStreamException {
     final String type = getAttribute(xmlr, "type");
     final Integer rank = getIntegerAttribute(xmlr, "rank");
@@ -105,7 +106,8 @@ private void parseBugInstance(
           if (!startLine.isPresent() || !endLine.isPresent()) {
             continue;
           }
-          final String filename = getAttribute(xmlr, "sourcepath");
+          final String sourcepath = getAttribute(xmlr, "sourcepath");
+          final String filename = resolveFilePath(sourcepath, srcDirs);
           final String classname = getAttribute(xmlr, "classname");
           candidates.add( //
               violationBuilder() //
@@ -152,20 +154,50 @@ public Set<Violation> parseReportOutput(
             violationsLogger,
             this.getMessagesXml(findSecurityBugsMessagesXml, "/findbugs/fsb-messages.xml")));
 
+    final List<String> srcDirs = new ArrayList<>();
+
     try (InputStream input = new ByteArrayInputStream(string.getBytes(StandardCharsets.UTF_8))) {
       final XMLStreamReader xmlr = ViolationParserUtils.createXmlReader(input);
+      boolean inProject = false;
       while (xmlr.hasNext()) {
         final int eventType = xmlr.next();
         if (eventType == XMLStreamConstants.START_ELEMENT) {
-          if (xmlr.getLocalName().equalsIgnoreCase("BugInstance")) {
-            this.parseBugInstance(xmlr, violations, messagesPerType);
+          if (xmlr.getLocalName().equalsIgnoreCase("Project")) {
+            inProject = true;
+          } else if (inProject && xmlr.getLocalName().equalsIgnoreCase("SrcDir")) {
+            srcDirs.add(xmlr.getElementText());
+          } else if (xmlr.getLocalName().equalsIgnoreCase("BugInstance")) {
+            this.parseBugInstance(xmlr, violations, messagesPerType, srcDirs);
+          }
+        }
+        if (eventType == XMLStreamConstants.END_ELEMENT) {
+          if (xmlr.getLocalName().equalsIgnoreCase("Project")) {
+            inProject = false;
           }
         }
       }
     }
     return violations;
   }
 
+  /**
+   * Resolves the complete file path by combining the single {@code SrcDir} with the {@code
+   * sourcepath}. Only applies if there is exactly one {@code SrcDir} entry in total and it is a
+   * directory (i.e. not ending with {@code .java}); otherwise returns {@code sourcepath} unchanged.
+   */
+  private String resolveFilePath(final String sourcepath, final List<String> srcDirs) {
+    if (sourcepath == null || sourcepath.isEmpty() || srcDirs.size() != 1) {
+      return sourcepath;
+    }
+    final String normalized = srcDirs.get(0).replace("\\", "/").trim();
+    if (normalized.endsWith(".java")) {
+      return sourcepath;
+    }
+    final String trimmed =
+        normalized.endsWith("/") ? normalized.substring(0, normalized.length() - 1) : normalized;
+    return trimmed + "/" + sourcepath;
+  }
+
   private String getMessagesXml(final String staticValue, final String messagesResourceFilename)
       throws IOException {
     String messagesXml;

violations-lib/src/test/java/se/bjurr/violations/lib/FindbugsTest.java

@@ -117,6 +117,23 @@ public void testThatViolationsCanBeParsedFromSpotbugs() {
         .isEqualTo("20");
   }
 
+  @Test
+  public void testThatSrcDirIsCombinedWithSourcepathWhenExactlyOneSrcDir() {
+    final String rootFolder = getRootFolder();
+    final Set<Violation> actual =
+        violationsApi() //
+            .withPattern(".*/findbugs/spotbugs-one-srcdir\\.xml$") //
+            .inFolder(rootFolder) //
+            .findAll(FINDBUGS) //
+            .violations();
+
+    assertThat(actual) //
+        .hasSize(1);
+    final Violation violation0 = new ArrayList<>(actual).get(0);
+    assertThat(violation0.getFile()) //
+        .isEqualTo("/builds/my-project/module-a/src/main/java/com/example/Foo.java");
+  }
+
   @Test
   public void testThatViolationsCanBeParsedFromSpotbugs2() {
     final String rootFolder = getRootFolder();

violations-lib/src/test/resources/findbugs/spotbugs-one-srcdir.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<BugCollection version="4.0.0" sequence="0" timestamp="1570255404454" analysisTimestamp="1570255404481" release="">
+  <Project projectName="module-a">
+    <SrcDir>/builds/my-project/module-a/src/main/java</SrcDir>
+  </Project>
+  <BugInstance type="MS_EXPOSE_REP" priority="1" rank="7" abbrev="MS" category="MALICIOUS_CODE">
+    <Class classname="com.example.Foo">
+      <SourceLine classname="com.example.Foo" start="1" end="50" sourcefile="Foo.java" sourcepath="com/example/Foo.java"/>
+    </Class>
+    <Method classname="com.example.Foo" name="getValues" signature="()[Ljava/lang/Object;" isStatic="false">
+      <SourceLine classname="com.example.Foo" start="42" end="42" sourcefile="Foo.java" sourcepath="com/example/Foo.java"/>
+    </Method>
+    <SourceLine classname="com.example.Foo" start="42" end="42" sourcefile="Foo.java" sourcepath="com/example/Foo.java"/>
+  </BugInstance>
+  <Errors errors="0" missingClasses="0"></Errors>
+  <FindBugsSummary timestamp="Wed, 12 Sep 2018 18:19:36 +0200" total_classes="1" referenced_classes="1" total_bugs="1" total_size="50" num_packages="1" java_version="1.8.0" vm_version="25.0" cpu_seconds="1.00" clock_seconds="1.00" peak_mbytes="100.00" alloc_mbytes="512.00" gc_seconds="0.01" priority_1="1">
+    <PackageStats package="com.example" total_bugs="1" total_types="1" total_size="50">
+      <ClassStats class="com.example.Foo" sourceFile="Foo.java" interface="false" size="50" bugs="1"/>
+    </PackageStats>
+  </FindBugsSummary>
+  <ClassFeatures></ClassFeatures>
+  <History></History>
+</BugCollection>