Add a logMissingClassFiles parameter, to prevent the logging of missi…

…ng class files

src/main/java/de/thetaphi/forbiddenapis/Checker.java

@@ -55,6 +55,7 @@ public static enum Option {
  FAIL_ON_VIOLATION,
  FAIL_ON_UNRESOLVABLE_SIGNATURES,
  LOG_MISSING_SIGNATURES,
+ LOG_MISSING_CLASS_FILES,
  DISABLE_CLASSLOADING_CACHE
  }
 

src/main/java/de/thetaphi/forbiddenapis/maven/AbstractCheckMojo.java

@@ -156,6 +156,15 @@ public abstract class AbstractCheckMojo extends AbstractMojo implements Constant
  */
  @Parameter(required = false, defaultValue = "true")
  private boolean logMissingSignatures;
+
+ /**
+ * Output a warning in the log if a the classes directory is missing or does not contain class 
+ * files. If this parameter is set to to false, then such directories are not logged at all.
+ * This is useful in multi-module Maven projects where not all modules have test classes.
+ * @since 2.8
+ */
+ @Parameter(required = false, defaultValue = "true")
+ private boolean logMissingClassFiles;
 
  /**
  * Fail the build if violations have been found. Defaults to {@code true}.
@@ -333,6 +342,7 @@ public void info(String msg) {
  if (failOnViolation) options.add(FAIL_ON_VIOLATION);
  if (failOnUnresolvableSignatures) options.add(FAIL_ON_UNRESOLVABLE_SIGNATURES);
  if (logMissingSignatures) options.add(LOG_MISSING_SIGNATURES);
+ if (logMissingClassFiles) options.add(LOG_MISSING_CLASS_FILES);
  if (disableClassloadingCache) options.add(DISABLE_CLASSLOADING_CACHE);
  final Checker checker = new Checker(log, loader, options);
 
@@ -357,7 +367,9 @@ public void info(String msg) {
  log.info("Scanning for classes to check...");
  final File classesDirectory = getClassesDirectory();
  if (!classesDirectory.exists()) {
- log.warn("Classes directory does not exist, forbiddenapis check skipped: " + classesDirectory);
+ if (logMissingClassFiles) {
+ log.warn("Classes directory does not exist, forbiddenapis check skipped: " + classesDirectory);
+ }
  return;
  }
  final DirectoryScanner ds = new DirectoryScanner();
@@ -369,9 +381,11 @@ public void info(String msg) {
  ds.scan();
  final String[] files = ds.getIncludedFiles();
  if (files.length == 0) {
- log.warn(String.format(Locale.ENGLISH,
- "No classes found in '%s' (includes=%s, excludes=%s), forbiddenapis check skipped.",
- classesDirectory.toString(), Arrays.toString(includes), Arrays.toString(excludes)));
+ if (logMissingClassFiles) {
+ log.warn(String.format(Locale.ENGLISH,
+ "No classes found in '%s' (includes=%s, excludes=%s), forbiddenapis check skipped.",
+ classesDirectory.toString(), Arrays.toString(includes), Arrays.toString(excludes)));
+ }
  return;
  }