reject binary files

Author: IlyaPechersky

qulice-checkstyle/src/main/resources/com/qulice/checkstyle/checks.xml

@@ -101,6 +101,15 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
     <property name="message" value="Two consecutive empty lines"/>
   </module>
   <!--
+  Checks that the file is not binary
+  -->
+  <module name="RegexpMultiline">
+      <property name="format" value=".*[\x00-\x08\x0E-\x1F].*"/>
+      <property name="fileExtensions" value="java"/>
+      <property name="id" value="BinaryFiles"/>
+      <property name="message" value="Binary files are not allowed"/>
+  </module>
+  <!--
   JavaDoc regexp checks
   -->
   <module name="RegexpSingleline">

qulice-checkstyle/src/test/java/com/qulice/checkstyle/CheckstyleValidatorTest.java

@@ -139,6 +139,16 @@ void acceptsInstanceMethodReferences() throws Exception {
         );
     }
 
+    /**
+     * CheckstyleValidator can deny binary contents in java file.
+     * This is test for #1264.
+     * @throws Exception If something wrong happens inside
+     */
+    @Test
+    void rejectsJavaFileWithBinaryContent() throws Exception {
+        this.runValidation("JavaFileWithBinaryContent.java", false);
+    }
+
     /**
      * CheckstyleValidator can report error when parameter object is not
      * documented.

qulice-checkstyle/src/test/resources/com/qulice/checkstyle/JavaFileWithBinaryContent.java

@@ -0,0 +1,9 @@
+/*
+ * Hello.
+ */
+package foo.bar;
+
+public class BinaryContent {
+    // Binary content: □▢■▣▤▥▦▧▨▩
+    private static String binaryText = "Binary content: \u2581\u2582\u2583\u2584\u2585\u2586\u2587\u2588\u2589";
+}