Allow users of the api to pass in a custom formatter to the YearMonthSerializer/Deserializer.

Author: iainCFX

src/main/java/com/fasterxml/jackson/datatype/jsr310/deser/YearMonthDeserializer.java

@@ -45,9 +45,9 @@ private YearMonthDeserializer()
         this(DateTimeFormatter.ofPattern("uuuu-MM"));
     }
 
-    protected YearMonthDeserializer(DateTimeFormatter dtf) 
+    public YearMonthDeserializer(DateTimeFormatter formatter)
     {
-        super(YearMonth.class, dtf);
+        super(YearMonth.class, formatter);
     }
 
     @Override

src/main/java/com/fasterxml/jackson/datatype/jsr310/ser/YearMonthSerializer.java

@@ -41,17 +41,20 @@ public class YearMonthSerializer extends JSR310FormattedSerializerBase<YearMonth
     public static final YearMonthSerializer INSTANCE = new YearMonthSerializer();
 
     private YearMonthSerializer() {
-        super(YearMonth.class);
+        this(null);
     }
 
-    private YearMonthSerializer(YearMonthSerializer base,
-            Boolean useTimestamp, DateTimeFormatter dtf) {
-        super(base, useTimestamp, dtf);
+    public YearMonthSerializer(DateTimeFormatter formatter) {
+        super(YearMonth.class, formatter);
+    }
+
+    private YearMonthSerializer(YearMonthSerializer base, Boolean useTimestamp, DateTimeFormatter formatter) {
+        super(base, useTimestamp, formatter);
     }
 
     @Override
-    protected YearMonthSerializer withFormat(Boolean useTimestamp, DateTimeFormatter dtf) {
-        return new YearMonthSerializer(this, useTimestamp, dtf);
+    protected YearMonthSerializer withFormat(Boolean useTimestamp, DateTimeFormatter formatter) {
+        return new YearMonthSerializer(this, useTimestamp, formatter);
     }
 
     @Override

src/test/java/com/fasterxml/jackson/datatype/jsr310/TestYearMonthSerializationWithCustomFormatter.java

@@ -0,0 +1,57 @@
+package com.fasterxml.jackson.datatype.jsr310;
+
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.junit.internal.matchers.StringContains.containsString;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.datatype.jsr310.deser.YearMonthDeserializer;
+import com.fasterxml.jackson.datatype.jsr310.ser.YearMonthSerializer;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.time.YearMonth;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Collection;
+
+@RunWith(Parameterized.class)
+public class TestYearMonthSerializationWithCustomFormatter {
+    private final DateTimeFormatter formatter;
+
+    public TestYearMonthSerializationWithCustomFormatter(DateTimeFormatter formatter) {
+        this.formatter = formatter;
+    }
+
+    @Test
+    public void testSerialization() throws Exception {
+        YearMonth dateTime = YearMonth.now();
+        assertThat(serializeWith(dateTime, formatter), containsString(dateTime.format(formatter)));
+    }
+
+    private String serializeWith(YearMonth dateTime, DateTimeFormatter formatter) throws Exception {
+        ObjectMapper mapper = new ObjectMapper().registerModule(new SimpleModule().addSerializer(new YearMonthSerializer(formatter)));
+        return mapper.writeValueAsString(dateTime);
+    }
+
+    @Test
+    public void testDeserialization() throws Exception {
+        YearMonth dateTime = YearMonth.now();
+        assertThat(deserializeWith(dateTime.format(formatter), formatter), equalTo(dateTime));
+    }
+
+    private YearMonth deserializeWith(String json, DateTimeFormatter formatter) throws Exception {
+        ObjectMapper mapper = new ObjectMapper().registerModule(new SimpleModule().addDeserializer(YearMonth.class, new YearMonthDeserializer(formatter)));
+        return mapper.readValue("\"" + json + "\"", YearMonth.class);
+    }
+
+    @Parameters
+    public static Collection<Object[]> customFormatters() {
+        Collection<Object[]> formatters = new ArrayList<>();
+        formatters.add(new Object[]{DateTimeFormatter.ofPattern("uuuu-MM")});
+        return formatters;
+    }
+}