Fix #188

Author: cowtowncoder

release-notes/VERSION

@@ -19,6 +19,7 @@ JSON library.
 #177: Add a check so `JsonGenerator.writeString()` won't work if `writeFieldName()` expected.
 #182: Inconsistent TextBuffer#getTextBuffer behavior
  (contributed by Masaru H)
+#188: `JsonParser.getValueAsString()` should return field name for `JsonToken.FIELD_NAME`, not `null`
 - Minor improvement to construction of "default PrettyPrinter": now overridable by data format
   modules
 - Implement a new yet more optimized symbol table for byte-backed parsers

src/main/java/com/fasterxml/jackson/core/base/ParserMinimalBase.java

@@ -389,15 +389,22 @@ public String getValueAsString() throws IOException {
         if (_currToken == JsonToken.VALUE_STRING) {
             return getText();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
         return getValueAsString(null);
     }
 
     @Override
     public String getValueAsString(String defaultValue) throws IOException {
-        if (_currToken != JsonToken.VALUE_STRING) {
-            if (_currToken == null || _currToken == JsonToken.VALUE_NULL || !_currToken.isScalarValue()) {
-                return defaultValue;
-            }
+        if (_currToken == JsonToken.VALUE_STRING) {
+            return getText();
+        }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
+        if (_currToken == null || _currToken == JsonToken.VALUE_NULL || !_currToken.isScalarValue()) {
+            return defaultValue;
         }
         return getText();
     }

src/main/java/com/fasterxml/jackson/core/json/ReaderBasedJsonParser.java

@@ -250,6 +250,9 @@ public final String getValueAsString() throws IOException
             }
             return _textBuffer.contentsAsString();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
         return super.getValueAsString(null);
     }
 
@@ -263,6 +266,9 @@ public final String getValueAsString(String defValue) throws IOException {
             }
             return _textBuffer.contentsAsString();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
         return super.getValueAsString(defValue);
     }
 

src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java

@@ -302,6 +302,9 @@ public String getValueAsString() throws IOException
             }
             return _textBuffer.contentsAsString();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
         return super.getValueAsString(null);
     }
 
@@ -316,6 +319,9 @@ public String getValueAsString(String defValue) throws IOException
             }
             return _textBuffer.contentsAsString();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return getCurrentName();
+        }
         return super.getValueAsString(defValue);
     }
 

src/test/java/com/fasterxml/jackson/core/json/TestJsonParser.java

@@ -1,6 +1,7 @@
 package com.fasterxml.jackson.core.json;
 
 import com.fasterxml.jackson.core.*;
+import com.fasterxml.jackson.core.util.JsonParserDelegate;
 
 import java.io.*;
 import java.net.URL;
@@ -510,7 +511,65 @@ private void _testHandlingOfInvalidSpaceFromResource(boolean useStream) throws E
         }
         jp.close();
     }
+
+    public void testGetValueAsTextBytes() throws Exception
+    {
+        JsonFactory f = new JsonFactory();
+        _testGetValueAsText(f, true, false);
+        _testGetValueAsText(f, true, true);
+    }
+
+    public void testGetValueAsTextChars() throws Exception
+    {
+        JsonFactory f = new JsonFactory();
+        _testGetValueAsText(f, false, false);
+        _testGetValueAsText(f, false, true);
+    }
 
+    @SuppressWarnings("resource")
+    private void _testGetValueAsText(JsonFactory f,
+            boolean useBytes, boolean delegate) throws Exception
+    {
+        String JSON = "{\"a\":1,\"b\":true,\"c\":null,\"d\":\"foo\"}";
+        JsonParser p = useBytes ? f.createParser(JSON.getBytes("UTF-8"))
+                : f.createParser(JSON);
+
+        if (delegate) {
+            p = new JsonParserDelegate(p);
+        }
+        
+        assertToken(JsonToken.START_OBJECT, p.nextToken());
+        assertNull(p.getValueAsString());
+
+        assertToken(JsonToken.FIELD_NAME, p.nextToken());
+        assertEquals("a", p.getText());
+        assertEquals("a", p.getValueAsString());
+        assertToken(JsonToken.VALUE_NUMBER_INT, p.nextToken());
+        assertEquals("1", p.getValueAsString());
+
+        assertToken(JsonToken.FIELD_NAME, p.nextToken());
+        assertEquals("b", p.getValueAsString());
+        assertToken(JsonToken.VALUE_TRUE, p.nextToken());
+        assertEquals("true", p.getValueAsString());
+
+        assertToken(JsonToken.FIELD_NAME, p.nextToken());
+        assertEquals("c", p.getValueAsString());
+        assertToken(JsonToken.VALUE_NULL, p.nextToken());
+        // null token returned as Java null, as per javadoc
+        assertNull(p.getValueAsString());
+
+        assertToken(JsonToken.FIELD_NAME, p.nextToken());
+        assertEquals("d", p.getValueAsString());
+        assertToken(JsonToken.VALUE_STRING, p.nextToken());
+        assertEquals("foo", p.getValueAsString());
+
+        assertToken(JsonToken.END_OBJECT, p.nextToken());
+        assertNull(p.getValueAsString());
+
+        assertNull(p.nextToken());
+        p.close();
+    }
+
     /*
     /**********************************************************
     /* Helper methods