Better handling of null values

Author: JohannesJander

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>io.frictionlessdata</groupId>
     <artifactId>tableschema-java</artifactId>
-    <version>0.2.1-SNAPSHOT</version>
+    <version>0.2.2-SNAPSHOT</version>
     <packaging>jar</packaging>
     <issueManagement>
         <url>https://github.com/frictionlessdata/tableschema-java/issues</url>

src/main/java/io/frictionlessdata/tableschema/field/DateField.java

@@ -78,11 +78,15 @@ public LocalDate parseValue(String value, String format, Map<String, Object> opt
 
     @Override
     public Object formatValueForJson(LocalDate value) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.toString();
     }
 
     @Override
     public String formatValueAsString(LocalDate value, String format, Map<String, Object> options) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
     }
 

src/main/java/io/frictionlessdata/tableschema/field/DatetimeField.java

@@ -50,6 +50,8 @@ public ZonedDateTime parseValue(String value, String format, Map<String, Object>
 
     @Override
     public String formatValueAsString(ZonedDateTime value, String format, Map<String, Object> options) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.format(formatter);
     }
 

src/main/java/io/frictionlessdata/tableschema/field/DurationField.java

@@ -35,6 +35,8 @@ public Duration parseValue(String value, String format, Map<String, Object> opti
 
     @Override
     public String formatValueAsString(Duration value, String format, Map<String, Object> options) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.toString();
     }
 

src/main/java/io/frictionlessdata/tableschema/field/IntegerField.java

@@ -33,6 +33,8 @@ public BigInteger parseValue(String value, String format, Map<String, Object> op
 
     @Override
     public String formatValueAsString(BigInteger value, String format, Map<String, Object> options) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.toString();
     }
 

src/main/java/io/frictionlessdata/tableschema/field/ObjectField.java

@@ -33,6 +33,8 @@ public Map<String, Object> parseValue(String value, String format, Map<String, O
     @Override
     public String formatValueAsString(Map<String, Object> value, String format, Map<String, Object> options)
             throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return JsonUtil.getInstance().serialize(value, false).replaceAll("[\n\r]", " ");
     }
 

src/main/java/io/frictionlessdata/tableschema/field/TimeField.java

@@ -44,11 +44,15 @@ public LocalTime parseValue(String value, String format, Map<String, Object> opt
 
     @Override
     public Object formatValueForJson(LocalTime value) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.format(DateTimeFormatter.ISO_LOCAL_TIME);
     }
 
     @Override
     public String formatValueAsString(LocalTime value, String format, Map<String, Object> options) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.format(DateTimeFormatter.ISO_LOCAL_TIME);
     }
 

src/main/java/io/frictionlessdata/tableschema/field/YearField.java

@@ -42,12 +42,16 @@ public Year parseValue(String value, String format, Map<String, Object> options)
 
     @Override
     public Object formatValueForJson(Year value) throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.getValue();
     }
 
     @Override
     public String formatValueAsString(Year value, String format, Map<String, Object> options)
             throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.toString();
     }
 

src/main/java/io/frictionlessdata/tableschema/field/YearmonthField.java

@@ -48,6 +48,8 @@ public YearMonth parseValue(String value, String format, Map<String, Object> opt
     @Override
     public String formatValueAsString(YearMonth value, String format, Map<String, Object> options)
             throws InvalidCastException, ConstraintsException {
+        if (null == value)
+            return null;
         return value.toString();
     }