Fix: Use Big Decimal for Tree (#135)

Author: Shounaks

jr-stree/src/main/java/com/fasterxml/jackson/jr/stree/JacksonJrsTreeCodec.java

@@ -13,12 +13,16 @@
  */
 public class JacksonJrsTreeCodec extends TreeCodec
 {
-    public static JrsMissing MISSING = JrsMissing.instance;
+    public static final JrsMissing MISSING = JrsMissing.instance;
+
     protected final ObjectCodec _objectCodec;
 
     // @since 2.17
     protected boolean _failOnDuplicateKeys;
-    
+
+    // @since 2.17.1
+    protected boolean _useBigDecimalForDouble;
+
     public JacksonJrsTreeCodec() {
         this(null);
     }
@@ -31,7 +35,12 @@ public JacksonJrsTreeCodec(ObjectCodec codec) {
     public void setFailOnDuplicateKeys(boolean state) {
         _failOnDuplicateKeys = state;
     }
-    
+
+    // @since 2.17.1
+    public void setUseBigDecimalForDouble(boolean state) {
+        _useBigDecimalForDouble = state;
+    }
+
     @SuppressWarnings("unchecked")
     @Override
     public <T extends TreeNode> T readTree(JsonParser p) throws IOException {
@@ -50,6 +59,9 @@ private JrsValue nodeFrom(JsonParser p) throws IOException
             return JrsBoolean.FALSE;
         case JsonTokenId.ID_NUMBER_INT:
         case JsonTokenId.ID_NUMBER_FLOAT:
+            if (_useBigDecimalForDouble) {
+                return new JrsNumber(p.getDecimalValue());
+            }
             return new JrsNumber(p.getNumberValue());
         case JsonTokenId.ID_STRING:
             return new JrsString(p.getText());

jr-stree/src/main/java/com/fasterxml/jackson/jr/stree/JrSimpleTreeExtension.java

@@ -28,6 +28,7 @@ public JrSimpleTreeExtension(JacksonJrsTreeCodec tc) {
     @Override
     protected void register(ExtensionContext ctxt) {
         _codec.setFailOnDuplicateKeys(ctxt.isEnabled(JSON.Feature.FAIL_ON_DUPLICATE_MAP_KEYS));
+        _codec.setUseBigDecimalForDouble(ctxt.isEnabled(JSON.Feature.USE_BIG_DECIMAL_FOR_FLOATS));
         ctxt.setTreeCodec(_codec);
     }
 }

jr-stree/src/test/java/com/fasterxml/jackson/jr/stree/ReadAsBigDecimal90Test.java

@@ -0,0 +1,48 @@
+package com.fasterxml.jackson.jr.stree;
+
+import com.fasterxml.jackson.core.TreeNode;
+import com.fasterxml.jackson.jr.ob.JSON;
+
+import java.math.BigDecimal;
+
+// [jackson-jr#90]: JSON.Feature.USE_BIG_DECIMAL_FOR_FLOATS should work
+public class ReadAsBigDecimal90Test extends JacksonJrTreeTestBase
+{
+    // [jackson-jr#90]
+    public void testDefaultBehaviourReadAsDouble() throws Exception
+    {
+        JSON json = JSON.builder()
+                .disable(JSON.Feature.USE_BIG_DECIMAL_FOR_FLOATS)
+                .register(new JrSimpleTreeExtension())
+                .build();
+
+        String input = "[1.1]";
+
+        TreeNode node = json.treeFrom(input);
+        TreeNode elemNode = node.get(0);
+
+        assertTrue(elemNode.isValueNode());
+        assertTrue(elemNode instanceof JrsNumber);
+        assertEquals(Double.class,
+                ((JrsNumber) elemNode).getValue().getClass());
+    }
+
+    // [jackson-jr#90]
+    public void testReadAsBigDecimal() throws Exception
+    {
+        JSON json = JSON.builder()
+                .enable(JSON.Feature.USE_BIG_DECIMAL_FOR_FLOATS)
+                .register(new JrSimpleTreeExtension())
+                .build();
+
+        String input = "[1.1]";
+
+        TreeNode node = json.treeFrom(input);
+        TreeNode elemNode = node.get(0);
+
+        assertTrue(elemNode.isValueNode());
+        assertTrue(elemNode instanceof JrsNumber);
+        assertEquals(BigDecimal.class,
+                ((JrsNumber) elemNode).getValue().getClass());
+    }
+}

jr-stree/src/test/java/com/fasterxml/jackson/jr/stree/failing/ReadAsBigDecimal90Test.java

@@ -61,3 +61,7 @@ Julian Honnen (@jhonnen)
  (2.17.0)
 * Contributed impl for #100: Add support for `java.time` (Java 8 date/time) types
  (2.17.0)
+* Contributed fix for #90: `USE_BIG_DECIMAL_FOR_FLOATS` feature not working
+  when using `JSON.treeFrom()`
+ (2.17.1)
+

release-notes/CREDITS-2.x

@@ -11,6 +11,12 @@ Modules:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.17.1 (not yet released)
+
+#90: `USE_BIG_DECIMAL_FOR_FLOATS` feature not working when using `JSON.treeFrom()`
+ (reported by @jvdsandt)
+ (fix contributed by @Shounaks)
+
 2.17.0 (12-Mar-2024)
 
 #7: Support deserialization of `int[]`