Fixed public api 'public static String serialize(boolean escapeUnicod…

src/main/java/com/jsoniter/output/JsonStream.java

@@ -442,52 +442,59 @@ public static void serialize(TypeLiteral typeLiteral, Object obj, OutputStream o
     }
 
     public static void serialize(Type type, Object obj, OutputStream out) {
-        JsonStream stream = JsonStreamPool.borrowJsonStream();
-        try {
-            try {
-                stream.reset(out);
-                stream.writeVal(type, obj);
-            } finally {
-                stream.close();
-            }
-        } catch (IOException e) {
-            throw new JsonException(e);
-        } finally {
-            JsonStreamPool.returnJsonStream(stream);
-        }
+        serialize(type, obj, out, false);
     }
 
     public static String serialize(Config config, Object obj) {
-        JsoniterSpi.setCurrentConfig(config);
-        try {
-            return serialize(config.escapeUnicode(), obj.getClass(), obj);
-        } finally {
-            JsoniterSpi.clearCurrentConfig();
-        }
+        return serialize(config, obj.getClass(), obj);
     }
 
     public static String serialize(Object obj) {
-        return serialize(JsoniterSpi.getCurrentConfig().escapeUnicode(), obj.getClass(), obj);
+        return serialize(obj.getClass(), obj);
     }
 
     public static String serialize(Config config, TypeLiteral typeLiteral, Object obj) {
+        return serialize(config, typeLiteral.getType(), obj);
+    }
+
+    private static String serialize(Config config, Type type, Object obj) {
+        final Config configBackup = JsoniterSpi.getCurrentConfig();
+        // Set temporary config
         JsoniterSpi.setCurrentConfig(config);
         try {
-            return serialize(config.escapeUnicode(), typeLiteral.getType(), obj);
+            return serialize(type, obj);
         } finally {
-            JsoniterSpi.clearCurrentConfig();
+            // Revert old config
+            JsoniterSpi.setCurrentConfig(configBackup);
         }
     }
 
     public static String serialize(TypeLiteral typeLiteral, Object obj) {
-        return serialize(JsoniterSpi.getCurrentConfig().escapeUnicode(), typeLiteral.getType(), obj);
+        return serialize(typeLiteral.getType(), obj);
     }
 
     public static String serialize(boolean escapeUnicode, Type type, Object obj) {
-        JsonStream stream = JsonStreamPool.borrowJsonStream();
+        final Config currentConfig = JsoniterSpi.getCurrentConfig();
+        return serialize(currentConfig.copyBuilder().escapeUnicode(escapeUnicode).build(), type, obj);
+    }
+
+    private static String serialize(Type type, Object obj) {
+        return serialize(type, obj, null, true);
+    }
+
+    private static String serialize(Type type, Object obj, OutputStream out, boolean returnObjAsString) {
+        final JsonStream stream = JsonStreamPool.borrowJsonStream();
+        final boolean escapeUnicode = JsoniterSpi.getCurrentConfig().escapeUnicode();
         try {
-            stream.reset(null);
-            stream.writeVal(type, obj);
+            try {
+                stream.reset(out);
+                stream.writeVal(type, obj);
+            } finally {
+                stream.close();
+            }
+            if (!returnObjAsString) {
+                return "";
+            }
             if (escapeUnicode) {
                 return new String(stream.buf, 0, stream.count);
             } else {

src/main/java/com/jsoniter/output/StreamImplString.java

@@ -132,7 +132,7 @@ private static void writeStringSlowPath(JsonStream stream, String val, int i, in
         if (escapeUnicode) {
             for (; i < valLen; i++) {
                 int c = val.charAt(i);
-                if (c > 125) {
+                if (c > 127) {
                     writeAsSlashU(stream, c);
                 } else {
                     writeAsciiChar(stream, c);
@@ -147,7 +147,7 @@ private static void writeStringSlowPathWithoutEscapeUnicode(JsonStream stream, S
         int _surrogate;
         for (; i < valLen; i++) {
             int c = val.charAt(i);
-            if (c > 125) {
+            if (c > 127) {
                 if (c < 0x800) { // 2-byte
                     stream.write(
                             (byte) (0xc0 | (c >> 6)),

src/main/java/com/jsoniter/spi/JsoniterSpi.java

@@ -43,6 +43,7 @@ public static void setCurrentConfig(Config val) {
         currentConfig.set(val);
     }
 
+    // TODO usage of this method leads to potentially unexpected side effects. All usage should be checked.
     public static void clearCurrentConfig() {
         currentConfig.set(defaultConfig);
     }

src/test/java/com/jsoniter/output/TestString.java

@@ -1,19 +1,40 @@
 package com.jsoniter.output;
 
 import com.jsoniter.spi.Config;
+import com.jsoniter.spi.Config.Builder;
+import com.jsoniter.spi.JsoniterSpi;
+import java.io.ByteArrayOutputStream;
 import junit.framework.TestCase;
 
 public class TestString extends TestCase {
+
+    public static final String UTF8_GREETING = "Привет čau 你好 ~";
+
     public void test_unicode() {
         String output = JsonStream.serialize(new Config.Builder().escapeUnicode(false).build(), "中文");
         assertEquals("\"中文\"", output);
     }
     public void test_unicode_tilde() {
-        String output = JsonStream.serialize(new Config.Builder().escapeUnicode(false).build(), "~");
-        assertEquals("\"~\"", output);
+        final String tilde = "~";
+        String output = JsonStream.serialize(new Config.Builder().escapeUnicode(false).build(), tilde);
+        assertEquals("\""+tilde+"\"", output);
+    }
+    public void test_escape_unicode() {
+        final Config config = new Builder().escapeUnicode(false).build();
+
+        assertEquals("\""+UTF8_GREETING+"\"", JsonStream.serialize(config, UTF8_GREETING));
+        assertEquals("\""+UTF8_GREETING+"\"", JsonStream.serialize(config.escapeUnicode(), UTF8_GREETING.getClass(), UTF8_GREETING));
     }
     public void test_escape_control_character() {
         String output = JsonStream.serialize(new String(new byte[]{0}));
         assertEquals("\"\\u0000\"", output);
     }
+    public void test_serialize_into_output_stream() {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        boolean escapeUnicode = JsoniterSpi.getCurrentConfig().escapeUnicode();
+        JsoniterSpi.setCurrentConfig(JsoniterSpi.getCurrentConfig().copyBuilder().escapeUnicode(false).build());
+        JsonStream.serialize(String.class, UTF8_GREETING, baos);
+        JsoniterSpi.setCurrentConfig(JsoniterSpi.getCurrentConfig().copyBuilder().escapeUnicode(escapeUnicode).build());
+        assertEquals("\"" + UTF8_GREETING + "\"", baos.toString());
+    }
 }