DateSerializer.java

package com.github.kzwang.osem.converter;


import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotatedField;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import com.github.kzwang.osem.annotations.IndexableProperty;
import org.elasticsearch.common.joda.Joda;
import org.elasticsearch.common.joda.time.DateTime;
import org.elasticsearch.common.joda.time.LocalDateTime;

import java.io.IOException;
import java.util.Date;


/**
 * Custom Data Serialize use Joda to parse date
 */
public class DateSerializer extends StdScalarSerializer<Date>
        implements ContextualSerializer {

    private String formatString;

    public DateSerializer() {
        super(Date.class);
    }


    @Override
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {
        if (property != null) {
            Annotated annotated = property.getMember();
            if (annotated instanceof AnnotatedField || annotated instanceof AnnotatedMethod) {
                IndexableProperty indexableProperty = annotated.getAnnotation(IndexableProperty.class);
                if (indexableProperty != null && !indexableProperty.format().isEmpty()) {
                    formatString = indexableProperty.format();
                }
            }
        }
        return this;
    }

    @Override
    public void serialize(Date value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonGenerationException {
        if (value == null) {
            jgen.writeNull();
            return;
        }
        if (formatString != null && !formatString.isEmpty()) {
            DateTime dateTime = new DateTime(value);
            jgen.writeString(Joda.forPattern(formatString).printer().print(dateTime));
        } else {
            provider.defaultSerializeDateValue(value, jgen);
        }
    }
}