main.java.com.zerobounce.GsonDateDeserializer Maven / Gradle / Ivy
package com.zerobounce;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import java.lang.reflect.Type;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
/**
* A custom deserializer for transforming date Strings into Date objects.
*/
public class GsonDateDeserializer implements JsonDeserializer {
private final SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.ROOT);
private final SimpleDateFormat format2 = new SimpleDateFormat("MM/dd/yyyy h:mm:ss a", Locale.ROOT);
@Override
public Date deserialize(
JsonElement json,
Type typeOfT,
JsonDeserializationContext context
) throws JsonParseException {
try {
String dateString = json.getAsJsonPrimitive().getAsString();
return parseDate(dateString);
} catch (ParseException e) {
throw new JsonParseException(e.getMessage(), e);
}
}
/**
* Tries to parse the given [dateString] into a [Date] object.
*
* @param dateString a date string
* @return a [Date] object or null
*/
private Date parseDate(String dateString) throws ParseException {
if (dateString != null && dateString.trim().length() > 0) {
try {
return format1.parse(dateString);
} catch (ParseException pe) {
return format2.parse(dateString);
}
} else {
return null;
}
}
}