Add Java 6's java.net.IDN.

harmony's tests and my code, though ICU4C does all the hard work.

I've added a test of my own to demonstrate some weird RI behavior (that I've
emulated in our implementation).

Bug: 2497395
Change-Id: I8146f72a8a3204449ee3d0d9065dadc1c1c77fcc

1 files changed, 44 insertions, 0 deletions

diff --git a/icu/src/main/java/com/ibm/icu4jni/text/NativeIDN.java b/icu/src/main/java/com/ibm/icu4jni/text/NativeIDN.java
new file mode 100644
index 0000000..b973131
--- /dev/null
+++ b/icu/src/main/java/com/ibm/icu4jni/text/NativeIDN.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.ibm.icu4jni.text;
+
+public class NativeIDN {
+    public static String toASCII(String s, int flags) {
+        return convert(s, flags, true);
+    }
+
+    public static String toUnicode(String s, int flags) {
+        try {
+            return convert(s, flags, false);
+        } catch (IllegalArgumentException ex) {
+            // The RI documentation explicitly states that this method can't fail.
+            // ICU4C disagrees, as does the RI in practice.
+            // The RI just returns the input string if it can't
+            return s;
+        }
+    }
+
+    private static String convert(String s, int flags, boolean toAscii) {
+        if (s == null) {
+            throw new NullPointerException();
+        }
+        return convertImpl(s, flags, toAscii);
+    }
+    private static native String convertImpl(String s, int flags, boolean toAscii);
+
+    private NativeIDN() {}
+}