Time and Date classes compressed down to single String field

Author: jdereg

README.md

@@ -10,7 +10,7 @@ Key Features:
 - Supports polymorphic types and complex object graphs
 - Zero external dependencies (other than java-util)
 - Fully compatible with both JPMS and OSGi environments
-- Lightweight (224K for json-io.jar, 405K for java-util)
+- Lightweight (237K for json-io.jar, 405K for java-util)
 - Compatible with JDK 1.8 through JDK 23
 - Extensive configuration options via ReadOptions and WriteOptions
 - Featured on [json.org](http://json.org)
@@ -31,15 +31,15 @@ ___
 To include in your project:
 ##### Gradle
 ```groovy
-implementation 'com.cedarsoftware:json-io:4.33.0'
+implementation 'com.cedarsoftware:json-io:4.34.0'
 ```
 
 ##### Maven
 ```xml
  <dependency>
    <groupId>com.cedarsoftware</groupId>
    <artifactId>json-io</artifactId>
-   <version>4.33.0</version>
+   <version>4.34.0</version>
  </dependency>
 ```
 ___
@@ -57,23 +57,23 @@ ___
 >- [ ] **Java Package**: com.cedarsoftware.io
 >- [ ] **Java**: JDK17+ (Class file 61 format, includes module-info.class - multi-release JAR)
 >- [ ] **API**
-   >  - Static methods on [JsonIo](https://www.javadoc.io/doc/com.cedarsoftware/json-io/latest/com/cedarsoftware/io/JsonIo.html): [toJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#toJson(java.lang.Object,com.cedarsoftware.io.WriteOptions)), [toObjects()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#toObjects(java.lang.String,com.cedarsoftware.io.ReadOptions,java.lang.Class)), [formatJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#formatJson(java.lang.String,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions)), [deepCopy()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#deepCopy(java.lang.Object,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions))
+   >  - Static methods on [JsonIo](https://www.javadoc.io/doc/com.cedarsoftware/json-io/latest/com/cedarsoftware/io/JsonIo.html): [toJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#toJson(java.lang.Object,com.cedarsoftware.io.WriteOptions)), [toObjects()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#toObjects(java.lang.String,com.cedarsoftware.io.ReadOptions,java.lang.Class)), [formatJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#formatJson(java.lang.String,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions)), [deepCopy()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#deepCopy(java.lang.Object,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions))
 >  - Use [ReadOptionsBuilder](/user-guide-readOptions.md) and [WriteOptionsBuilder](/user-guide-writeOptions.md) to configure `JsonIo`
->  - Use [JsonReader.ClassFactory](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonReader.ClassFactory.html) for difficult classes (hard to instantiate & fill)
->  - Use [JsonWriter.JsonClassWriter](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonWriter.JsonClassWriter.html) to customize the output JSON for a particular class
+>  - Use [JsonReader.ClassFactory](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonReader.ClassFactory.html) for difficult classes (hard to instantiate & fill)
+>  - Use [JsonWriter.JsonClassWriter](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonWriter.JsonClassWriter.html) to customize the output JSON for a particular class
 >- [ ] Updates will be 5.1.0, 5.2.0, ...
->### 4.33.0 (current)
->- [ ] **Version**: [4.33.0](https://www.javadoc.io/doc/com.cedarsoftware/json-io/4.33.0/index.html)
+>### 4.34.0 (current)
+>- [ ] **Version**: [4.34.0](https://www.javadoc.io/doc/com.cedarsoftware/json-io/4.34.0/index.html)
 >- [ ] **Bundling**: Both JPMS (Java Platform Module System) and OSGi (Open Service Gateway initiative)
 >- [ ] **Maintained**: Fully
 >- [ ] **Java Package**: com.cedarsoftware.io
 >- [ ] **Java**: JDK1.8+ (Class file 52 format, includes module-info.class - multi-release JAR)
 >- [ ] **API**
->  - Static methods on [JsonIo](https://www.javadoc.io/doc/com.cedarsoftware/json-io/latest/com/cedarsoftware/io/JsonIo.html): [toJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#toJson(java.lang.Object,com.cedarsoftware.io.WriteOptions)), [toObjects()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#toObjects(java.lang.String,com.cedarsoftware.io.ReadOptions,java.lang.Class)), [formatJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#formatJson(java.lang.String,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions)), [deepCopy()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonIo.html#deepCopy(java.lang.Object,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions))
+>  - Static methods on [JsonIo](https://www.javadoc.io/doc/com.cedarsoftware/json-io/latest/com/cedarsoftware/io/JsonIo.html): [toJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#toJson(java.lang.Object,com.cedarsoftware.io.WriteOptions)), [toObjects()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#toObjects(java.lang.String,com.cedarsoftware.io.ReadOptions,java.lang.Class)), [formatJson()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#formatJson(java.lang.String,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions)), [deepCopy()](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonIo.html#deepCopy(java.lang.Object,com.cedarsoftware.io.ReadOptions,com.cedarsoftware.io.WriteOptions))
 >  - Use [ReadOptionsBuilder](/user-guide-readOptions.md) and [WriteOptionsBuilder](/user-guide-writeOptions.md) to configure `JsonIo`
->  - Use [JsonReader.ClassFactory](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonReader.ClassFactory.html) for difficult classes (hard to instantiate & fill)
->  - Use [JsonWriter.JsonClassWriter](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.33.0/com/cedarsoftware/io/JsonWriter.JsonClassWriter.html) to customize the output JSON for a particular class
->- [ ] Updates will be 4.34.0, 4.35.0, ...
+>  - Use [JsonReader.ClassFactory](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonReader.ClassFactory.html) for difficult classes (hard to instantiate & fill)
+>  - Use [JsonWriter.JsonClassWriter](https://www.javadoc.io/static/com.cedarsoftware/json-io/4.34.0/com/cedarsoftware/io/JsonWriter.JsonClassWriter.html) to customize the output JSON for a particular class
+>- [ ] Updates will be 4.35.0, 4.36.0, ...
 >### 4.14.x (supported)
 >- [ ] **Version**: [4.14.3](https://www.javadoc.io/doc/com.cedarsoftware/json-io/4.14.3/index.html)
 >- [ ] **Bundling**: Both JPMS (Java Platform Module System) and OSGi (Open Service Gateway initiative)

changelog.md

@@ -1,4 +1,6 @@
 ### Revision History
+#### 4.34.0
+  * Improved Date and java.sql.Date handling within Converters.
 #### 4.33.0
   * New custom `ClassFactory` classes are easier to write:
     * See [examples](user-guide.md#classfactory-and-customwriter-examples)

pom.xml

@@ -5,7 +5,7 @@
     <groupId>com.cedarsoftware</groupId>
     <artifactId>json-io</artifactId>
     <packaging>bundle</packaging>
-    <version>4.33.0</version>
+    <version>4.34.0</version>
     <description>Java JSON serialization</description>
     <url>https://github.com/jdereg/json-io</url>
 
@@ -26,8 +26,7 @@
         <maven.build.timestamp.format>yyyy-MM-dd'T'HH:mm:ss.SSSZ</maven.build.timestamp.format>
         <!-- remove source encoding warnings from maven output -->
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-
-        <version.java-util>3.0.2</version.java-util>
+        <version.java-util>3.0.3</version.java-util>
         <!-- testing only -->
         <version.junit-jupiter-params>5.11.4</version.junit-jupiter-params>
         <version.assertj-core>3.27.2</version.assertj-core>

src/main/java/com/cedarsoftware/io/JsonIo.java

@@ -3,7 +3,6 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
-import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
@@ -381,11 +380,8 @@ public static WriteOptionsBuilder getWriteOptionsBuilder(Map<String, Object> opt
         WriteOptionsBuilder builder = new WriteOptionsBuilder();
 
         Object dateFormat = optionalArgs.get(DATE_FORMAT);
-        if (dateFormat instanceof String)
-        {
-            builder.dateTimeFormat((String) dateFormat);
-        } else if (dateFormat instanceof SimpleDateFormat) {
-            builder.dateTimeFormat(((SimpleDateFormat) dateFormat).toPattern());
+        if (dateFormat != null) {
+            builder.isoDateFormat();
         }
 
         Boolean showType = com.cedarsoftware.util.Converter.convert(optionalArgs.get(TYPE), Boolean.class);

src/main/java/com/cedarsoftware/io/WriteOptionsBuilder.java

@@ -636,23 +636,14 @@ public WriteOptionsBuilder addExcludedFields(Map<Class<?>, Collection<String>> e
     }
 
     /**
-     * Change the date-time format to the ISO date format: "yyyy-MM-dd".  This is for java.util.Data and
-     * java.sql.Date.
+     * Change the date-time format to the ISO date format: "yyyy-MM-ddThh:mm:ss.SSSZ".  This is for java.util.Date and
+     * java.sql.Date.  The fractional sections are omitted if millis are 0.
      *
      * @return WriteOptionsBuilder for chained access.
      */
     public WriteOptionsBuilder isoDateFormat() {
-        return dateTimeFormat(ISO_DATE_FORMAT);
-    }
-
-    /**
-     * Change the date-time format to the ISO date-time format: "yyyy-MM-dd'T'HH:mm:ss" (default).  This is
-     * for java.util.Date and java.sql.Date.
-     *
-     * @return WriteOptionsBuilder for chained access.
-     */
-    public WriteOptionsBuilder isoDateTimeFormat() {
-        return dateTimeFormat(ISO_DATE_TIME_FORMAT);
+        addCustomWrittenClass(Date.class, new Writers.DateWriter());
+        return this;
     }
 
     /**
@@ -666,18 +657,6 @@ public WriteOptionsBuilder longDateFormat() {
         addCustomWrittenClass(Date.class, new Writers.DateAsLongWriter());
         return this;
     }
-
-    /**
-     * Change the date-time format to the passed in format.  The format pattens can be found in the Java Doc
-     * for the java.time.format.DateTimeFormatter class.  There are many constants you can use, as well as
-     * the definition of how to construct your own patterns.  This is for java.util.Date and java.sql.Date.
-     *
-     * @return WriteOptionsBuilder for chained access.
-     */
-    public WriteOptionsBuilder dateTimeFormat(String format) {
-        addCustomWrittenClass(Date.class, new Writers.DateWriter(format));
-        return this;
-    }
 
     /**
      * This option permits adding non-standard accessors (used when writing JSON) that access properties from objects,

src/main/java/com/cedarsoftware/io/Writers.java

@@ -4,7 +4,6 @@
 import java.io.Writer;
 import java.math.BigDecimal;
 import java.math.BigInteger;
-import java.sql.Timestamp;
 import java.text.SimpleDateFormat;
 import java.time.Instant;
 import java.time.LocalDate;
@@ -20,8 +19,6 @@
 import java.time.format.DateTimeFormatterBuilder;
 import java.time.format.SignStyle;
 import java.time.temporal.TemporalAccessor;
-import java.util.Calendar;
-import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
 import java.util.UUID;
@@ -206,40 +203,61 @@ public String extractString(Object o) {
 
     public static class CalendarWriter implements JsonWriter.JsonClassWriter {
         @Override
+        public void writePrimitiveForm(Object o, Writer output, WriterContext context) throws IOException {
+            String formatted = Converter.convert(o, String.class);
+            JsonWriter.writeBasicString(output, formatted);
+        }
+
         public void write(Object obj, boolean showType, Writer output, WriterContext context) throws IOException {
-            Calendar cal = (Calendar) obj;
-            // TODO:  shouldn't this be the one inside the WriterContext?  and shouldn't there be a back up of parseDate() here?
-            dateFormat.get().setTimeZone(cal.getTimeZone());
-            output.write("\"time\":\"");
-            output.write(dateFormat.get().format(cal.getTime()));
-            output.write("\",\"zone\":\"");
-            output.write(cal.getTimeZone().getID());
-            output.write('"');
+            if (showType) {
+                JsonWriter.writeBasicString(output, "calendar");
+                output.write(':');
+            }
+
+            writePrimitiveForm(obj, output, context);
+        }
+
+        public boolean hasPrimitiveForm(WriterContext context) {
+            return true;
         }
     }
 
     public static class DateAsLongWriter extends PrimitiveValueWriter {
         @Override
         public String extractString(Object o) {
-            return Long.toString(((Date) o).getTime());
+            if (o instanceof java.sql.Date) {
+                // Just use the date's built-in toString - it's already in JDBC format
+                return o.toString();
+            } else {
+                return Long.toString(((java.util.Date) o).getTime());
+            }
         }
     }
-
-    public static class DateWriter extends PrimitiveUtf8StringWriter {
-        // could change to DateFormatter.ofPattern to keep from creating new objects
-        private final String dateFormat;
-
-        public DateWriter(String format) {
-            this.dateFormat = format;
+    
+    public static class DateWriter implements JsonWriter.JsonClassWriter {
+        @Override
+        public void writePrimitiveForm(Object o, Writer output, WriterContext context) throws IOException {
+            String formatted = Converter.convert(o, String.class);
+            JsonWriter.writeBasicString(output, formatted);
         }
 
-        public String extractString(Object o) {
-            Date date = (Date) o;
-            return new SimpleDateFormat(dateFormat).format(date);
+        public void write(Object obj, boolean showType, Writer output, WriterContext context) throws IOException {
+            if (showType) {
+                String key;
+                if (obj instanceof java.sql.Date) {
+                    key = "sqlDate";
+                } else {
+                    key = "date";
+                }
+                JsonWriter.writeBasicString(output, key);
+                output.write(':');
+            }
+
+            writePrimitiveForm(obj, output, context);
         }
 
-        String getDateFormat() {
-            return dateFormat;
+        public boolean hasPrimitiveForm(WriterContext context) {
+            return true;
         }
     }
 
@@ -255,9 +273,6 @@ public LocalDateAsLong() {
         }
 
         public void writePrimitiveForm(Object o, Writer output, WriterContext writerContext) throws IOException {
-
-            //TODO:  Change to using converter and having the writeOptions provide a zoneId;
-            //TODO:  If we're going to provide a LocalDateAsLong we should also provide a LocalDateTimeAsLong
             LocalDate localDate = (LocalDate) o;
             ZonedDateTime zonedDateTime = localDate.atStartOfDay(zoneId);
 
@@ -358,15 +373,15 @@ public OffsetDateTimeWriter() {
     }
 
     public static class TimestampWriter implements JsonWriter.JsonClassWriter {
+        @Override
         public void writePrimitiveForm(Object o, Writer output, WriterContext context) throws IOException {
-            Timestamp timestamp = (Timestamp) o;
-            String ts = Converter.convert(timestamp, String.class);
-            JsonWriter.writeBasicString(output, ts);
+            String formatted = Converter.convert(o, String.class);
+            JsonWriter.writeBasicString(output, formatted);
         }
 
         public void write(Object obj, boolean showType, Writer output, WriterContext context) throws IOException {
             if (showType) {
-                JsonWriter.writeBasicString(output, VALUE);
+                JsonWriter.writeBasicString(output, "timestamp");
                 output.write(':');
             }
 

src/main/java/com/cedarsoftware/io/factory/TimestampFactory.java

@@ -60,7 +60,7 @@ java.nio.HeapCharBuffer = com.cedarsoftware.io.factory.CharBufferFactory
 
 # java.sql
 java.sql.Date = Convertable
-java.sql.Timestamp = com.cedarsoftware.io.factory.TimestampFactory
+java.sql.Timestamp = Convertable
 
 # java.time
 java.time.Duration = Convertable

src/main/resources/config/classFactory.txt

@@ -31,7 +31,7 @@ java.net.URI = com.cedarsoftware.io.Writers$PrimitiveUtf8StringWriter
 java.nio.ByteBuffer = com.cedarsoftware.io.writers.ByteBufferWriter
 java.nio.CharBuffer = com.cedarsoftware.io.writers.CharBufferWriter
 
-java.sql.Date = com.cedarsoftware.io.Writers$DateAsLongWriter
+java.sql.Date = com.cedarsoftware.io.Writers$DateWriter
 java.sql.Timestamp = com.cedarsoftware.io.Writers$TimestampWriter
 
 java.time.Duration = com.cedarsoftware.io.writers.DurationWriter

src/main/resources/config/customWriters.txt

@@ -598,7 +598,7 @@ void testReconsitutute_withCalendars_whenArrayTypeIsCalendar() {
 
     @Test
     void testReconstitute_withGregorianCalendars_whenArrayTypeIsCalendar() {
-        GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance(TimeZone.getTimeZone("GMT-05:00"));
+        GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance(TimeZone.getTimeZone("America/New_York"));
         GregorianCalendar[] calendarz = new GregorianCalendar[]{cal, cal};
         testReconstituteArrayHelper(calendarz);
     }