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General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.ser.std;
import java.io.IOException;
import java.lang.reflect.Type;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.atomic.AtomicReference;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsonFormatVisitors.*;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.util.StdDateFormat;
@SuppressWarnings("serial")
public abstract class DateTimeSerializerBase
extends StdScalarSerializer
implements ContextualSerializer
{
/**
* Flag that indicates that serialization must be done as the
* Java timestamp, regardless of other settings.
*/
protected final Boolean _useTimestamp;
/**
* Specific format to use, if not default format: non null value
* also indicates that serialization is to be done as JSON String,
* not numeric timestamp, unless {@link #_useTimestamp} is true.
*/
protected final DateFormat _customFormat;
/**
* If {@link #_customFormat} is used, we will try to reuse instances in simplest
* possible form; thread-safe, but without overhead of ThreadLocal
* (not from code, but wrt retaining of possibly large number of format instances
* over all threads, properties with custom formats).
*
* @since 2.9
*/
protected final AtomicReference _reusedCustomFormat;
protected DateTimeSerializerBase(Class type,
Boolean useTimestamp, DateFormat customFormat)
{
super(type);
_useTimestamp = useTimestamp;
_customFormat = customFormat;
_reusedCustomFormat = (customFormat == null) ? null : new AtomicReference();
}
public abstract DateTimeSerializerBase withFormat(Boolean timestamp, DateFormat customFormat);
@Override
public JsonSerializer createContextual(SerializerProvider serializers,
BeanProperty property) throws JsonMappingException
{
// Note! Should not skip if `property` null since that'd skip check
// for config overrides, in case of root value
JsonFormat.Value format = findFormatOverrides(serializers, property, handledType());
if (format == null) {
return this;
}
// Simple case first: serialize as numeric timestamp?
JsonFormat.Shape shape = format.getShape();
if (shape.isNumeric()) {
return withFormat(Boolean.TRUE, null);
}
// 08-Jun-2017, tatu: With [databind#1648], this gets bit tricky..
// First: custom pattern will override things
if (format.hasPattern()) {
final Locale loc = format.hasLocale()
? format.getLocale()
: serializers.getLocale();
SimpleDateFormat df = new SimpleDateFormat(format.getPattern(), loc);
TimeZone tz = format.hasTimeZone() ? format.getTimeZone()
: serializers.getTimeZone();
df.setTimeZone(tz);
return withFormat(Boolean.FALSE, df);
}
// Otherwise, need one of these changes:
final boolean hasLocale = format.hasLocale();
final boolean hasTZ = format.hasTimeZone();
final boolean asString = (shape == JsonFormat.Shape.STRING);
if (!hasLocale && !hasTZ && !asString) {
return this;
}
DateFormat df0 = serializers.getConfig().getDateFormat();
// Jackson's own `StdDateFormat` is quite easy to deal with...
if (df0 instanceof StdDateFormat) {
StdDateFormat std = (StdDateFormat) df0;
if (format.hasLocale()) {
std = std.withLocale(format.getLocale());
}
if (format.hasTimeZone()) {
std = std.withTimeZone(format.getTimeZone());
}
return withFormat(Boolean.FALSE, std);
}
// 08-Jun-2017, tatu: Unfortunately there's no generally usable
// mechanism for changing `DateFormat` instances (or even clone()ing)
// So: require it be `SimpleDateFormat`; can't config other types
if (!(df0 instanceof SimpleDateFormat)) {
serializers.reportBadDefinition(handledType(), String.format(
"Configured `DateFormat` (%s) not a `SimpleDateFormat`; cannot configure `Locale` or `TimeZone`",
df0.getClass().getName()));
}
SimpleDateFormat df = (SimpleDateFormat) df0;
if (hasLocale) {
// Ugh. No way to change `Locale`, create copy; must re-crete completely:
df = new SimpleDateFormat(df.toPattern(), format.getLocale());
} else {
df = (SimpleDateFormat) df.clone();
}
TimeZone newTz = format.getTimeZone();
boolean changeTZ = (newTz != null) && !newTz.equals(df.getTimeZone());
if (changeTZ) {
df.setTimeZone(newTz);
}
return withFormat(Boolean.FALSE, df);
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public boolean isEmpty(SerializerProvider serializers, T value) {
// 09-Mar-2017, tatu: as per [databind#1550] timestamp 0 is NOT "empty"; but
// with versions up to 2.8.x this was the case. Fixed for 2.9.
// return _timestamp(value) == 0L;
return false;
}
protected abstract long _timestamp(T value);
@Override
public JsonNode getSchema(SerializerProvider serializers, Type typeHint) {
//todo: (ryan) add a format for the date in the schema?
return createSchemaNode(_asTimestamp(serializers) ? "number" : "string", true);
}
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException
{
_acceptJsonFormatVisitor(visitor, typeHint, _asTimestamp(visitor.getProvider()));
}
/*
/**********************************************************
/* Actual serialization
/**********************************************************
*/
@Override
public abstract void serialize(T value, JsonGenerator gen, SerializerProvider serializers)
throws IOException;
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
protected boolean _asTimestamp(SerializerProvider serializers)
{
if (_useTimestamp != null) {
return _useTimestamp.booleanValue();
}
if (_customFormat == null) {
if (serializers != null) {
return serializers.isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
}
// 12-Jun-2014, tatu: Is it legal not to have provider? Was NPE:ing earlier so leave a check
throw new IllegalArgumentException("Null SerializerProvider passed for "+handledType().getName());
}
return false;
}
protected void _acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint,
boolean asNumber) throws JsonMappingException
{
if (asNumber) {
visitIntFormat(visitor, typeHint,
JsonParser.NumberType.LONG, JsonValueFormat.UTC_MILLISEC);
} else {
visitStringFormat(visitor, typeHint, JsonValueFormat.DATE_TIME);
}
}
/**
* @since 2.9
*/
protected void _serializeAsString(Date value, JsonGenerator g, SerializerProvider provider) throws IOException
{
if (_customFormat == null) {
provider.defaultSerializeDateValue(value, g);
return;
}
// 19-Jul-2017, tatu: Here we will try a simple but (hopefully) effective mechanism for
// reusing formatter instance. This is our second attempt, after initially trying simple
// synchronization (which turned out to be bottleneck for some users in production...).
// While `ThreadLocal` could alternatively be used, it is likely that it would lead to
// higher memory footprint, but without much upside -- if we can not reuse, we'll just
// clone(), which has some overhead but not drastic one.
DateFormat f = _reusedCustomFormat.getAndSet(null);
if (f == null) {
f = (DateFormat) _customFormat.clone();
}
g.writeString(f.format(value));
_reusedCustomFormat.compareAndSet(null, f);
}
}