[android] - replace platform default implementation using nunicode fo…

…r uppercasing an lowercasing with an Android specific String.java equivalent

platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/string/UppperLowerCaseTest.java

@@ -0,0 +1,50 @@
+package com.mapbox.mapboxsdk.testapp.string;
+
+import com.mapbox.mapboxsdk.testapp.activity.BaseActivityTest;
+import com.mapbox.mapboxsdk.testapp.activity.espresso.EspressoTestActivity;
+import org.junit.Test;
+
+import static junit.framework.Assert.assertEquals;
+
+/**
+ * Test verifying if String#toUpperCase and String#toLowerCase produces desired results
+ * <p>
+ * See core test in https://github.com/mapbox/mapbox-gl-native/blob/master/test/util/text_conversions.test.cpp
+ * </p>
+ */
+public class UppperLowerCaseTest extends BaseActivityTest {
+
+  @Override
+  protected Class getActivityClass() {
+    return EspressoTestActivity.class;
+  }
+
+  @Test
+  public void testToUpperCase() {
+    assertEquals("STREET", "strEEt".toUpperCase());  // EN
+    assertEquals("ROAD", "rOAd".toUpperCase());      // EN
+
+    assertEquals("STRASSE", "straße".toUpperCase()); // DE
+    assertEquals("MASSE", "maße".toUpperCase());     // DE
+    assertEquals("WEISSKOPFSEEADLER", "weißkopfseeadler".toUpperCase()); // DE
+
+    assertEquals("BÊNÇÃO", "bênção".toUpperCase()); // PT
+    assertEquals("AZƏRBAYCAN", "Azərbaycan".toUpperCase()); // AZ
+    assertEquals("ὈΔΥΣΣΕΎΣ", "Ὀδυσσεύς".toUpperCase()); // GR
+  }
+
+  @Test
+  public void testToLowerCase() {
+    assertEquals("street", "strEEt".toLowerCase());  // EN
+    assertEquals("road", "rOAd".toLowerCase());      // EN
+
+    assertEquals("straße", "Straße".toLowerCase());   // DE
+    assertEquals("strasse", "STRASSE".toLowerCase()); // DE
+    assertEquals("masse", "MASSE".toLowerCase());     // DE
+    assertEquals("weisskopfseeadler", "weiSSkopfseeadler".toLowerCase()); // DE
+
+    assertEquals("bênção", "BÊNÇÃO".toLowerCase()); // PT
+    assertEquals("azərbaycan", "AZƏRBAYCAN".toLowerCase()); //
+  }
+
+}

platform/android/core-files.txt

@@ -11,7 +11,7 @@ platform/android/src/text/local_glyph_rasterizer.cpp
 platform/android/src/text/local_glyph_rasterizer_jni.hpp
 platform/android/src/logging_android.cpp
 platform/android/src/thread.cpp
-platform/default/string_stdlib.cpp
+platform/android/src/string_util.cpp
 platform/default/bidi.cpp
 platform/default/thread_local.cpp
 platform/default/unaccent.cpp

platform/android/src/java/lang.cpp

@@ -5,6 +5,25 @@ namespace android {
 namespace java {
 namespace lang {
 
+// String
+
+jni::String String::toUpperCase(JNIEnv& env, jni::String value) {
+    static auto method = javaClass.GetMethod<jni::String ()>(env, "toUpperCase");
+    return value.Call(env, method);
+}
+
+jni::String String::toLowerCase(JNIEnv& env, jni::String value) {
+    static auto method = javaClass.GetMethod<jni::String ()>(env, "toLowerCase");
+    return value.Call(env, method);
+}
+
+void String::registerNative(jni::JNIEnv& env) {
+    // Lookup the class
+    javaClass = *jni::Class<jni::StringTag>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<jni::StringTag> String::javaClass;
+
 // Float
 
 jni::Object<Float> Float::valueOf(JNIEnv &env, jfloat value) {

platform/android/src/java/lang.hpp

@@ -8,6 +8,17 @@ namespace android {
 namespace java {
 namespace lang {
 
+class String : private mbgl::util::noncopyable {
+public:
+    static jni::String toUpperCase(JNIEnv&, jni::String);
+
+    static jni::String toLowerCase(JNIEnv&, jni::String);
+
+    static jni::Class<jni::StringTag> javaClass;
+
+    static void registerNative(jni::JNIEnv&);
+};
+
 class Float : private mbgl::util::noncopyable {
 public:
     static constexpr auto Name() { return "java/lang/Float"; };

platform/android/src/jni.cpp

@@ -120,6 +120,7 @@ void registerNatives(JavaVM *vm) {
     java::lang::Boolean::registerNative(env);
     java::lang::Double::registerNative(env);
     java::lang::Long::registerNative(env);
+    java::lang::String::registerNative(env);
 
     // GeoJSON
     geojson::Feature::registerNative(env);

platform/android/src/string_util.cpp

@@ -0,0 +1,21 @@
+#include <mbgl/util/platform.hpp>
+#include "java/lang.hpp"
+#include "attach_env.hpp"
+
+namespace mbgl {
+namespace platform {
+
+std::string uppercase(const std::string& str) {
+    auto env{ android::AttachEnv() };
+    auto jstring = jni::Make<jni::String>(*env, str.c_str());
+    return jni::Make<std::string>(*env, mbgl::android::java::lang::String::toUpperCase(*env, jstring));
+}
+
+std::string lowercase(const std::string& str) {
+    auto env{ android::AttachEnv() };
+    auto jstring = jni::Make<jni::String>(*env, str.c_str());
+    return jni::Make<std::string>(*env, mbgl::android::java::lang::String::toLowerCase(*env, jstring));
+}
+
+} // namespace platform
+} // namespace mbgl