SONARPLUGINS-1233 Delete the Sonar working/temporary directory before starting analysis

Duplicate code from commons-io as we don't want dependency in Sonar Runner.

src/main/java/org/sonar/runner/Runner.java

@@ -19,9 +19,9 @@
  */
 package org.sonar.runner;
 
-import org.apache.commons.io.FileUtils;
-
 import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
@@ -177,10 +177,91 @@ public final class Runner {
     else {
       workDir = defineCustomizedWorkDir(new File(customWorkDir));
     }
-    FileUtils.deleteQuietly(workDir);
+    deleteQuietly(workDir);
     return workDir;
   }
 
+  /**
+   * Duplicated from Commons IO because we don't want dependencies in Sonar Runner
+   */
+  private static boolean deleteQuietly(File file) {
+    if (file == null) {
+      return false;
+    }
+    try {
+      if (file.isDirectory()) {
+        cleanDirectory(file);
+      }
+    } catch (Exception ignored) {
+    }
+
+    try {
+      return file.delete();
+    } catch (Exception ignored) {
+      return false;
+    }
+  }
+
+  private static void cleanDirectory(File directory) throws IOException {
+    if (!directory.exists()) {
+      String message = directory + " does not exist";
+      throw new IllegalArgumentException(message);
+    }
+
+    if (!directory.isDirectory()) {
+      String message = directory + " is not a directory";
+      throw new IllegalArgumentException(message);
+    }
+
+    File[] files = directory.listFiles();
+    if (files == null) { // null if security restricted
+      throw new IOException("Failed to list contents of " + directory);
+    }
+
+    IOException exception = null;
+    for (File file : files) {
+      try {
+        forceDelete(file);
+      } catch (IOException ioe) {
+        exception = ioe;
+      }
+    }
+
+    if (null != exception) {
+      throw exception;
+    }
+  }
+
+  private static void forceDelete(File file) throws IOException {
+    if (file.isDirectory()) {
+      deleteDirectory(file);
+    } else {
+      boolean filePresent = file.exists();
+      if (!file.delete()) {
+        if (!filePresent) {
+          throw new FileNotFoundException("File does not exist: " + file);
+        }
+        String message =
+            "Unable to delete file: " + file;
+        throw new IOException(message);
+      }
+    }
+  }
+
+  private static void deleteDirectory(File directory) throws IOException {
+    if (!directory.exists()) {
+      return;
+    }
+
+    cleanDirectory(directory);
+
+    if (!directory.delete()) {
+      String message =
+          "Unable to delete directory " + directory + ".";
+      throw new IOException(message);
+    }
+  }
+
   private File defineCustomizedWorkDir(File customWorkDir) {
     if (customWorkDir.isAbsolute()) {
       return customWorkDir;