DateDeserializer.java

package com.github.kzwang.osem.converter;


import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotatedField;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.github.kzwang.osem.annotations.IndexableProperty;
import org.elasticsearch.common.joda.Joda;

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

/**
 * Custom Data Deserializer use Joda to parse date
 */
public class DateDeserializer extends StdScalarDeserializer<Object>
        implements ContextualDeserializer {

    private String formatString;

    public DateDeserializer() {
        super(Object.class);
    }


    @Override
    public JsonDeserializer<?> createContextual(DeserializationContext ctxt, 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 Object deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        if (formatString != null && !formatString.isEmpty() && jp.getCurrentToken() == JsonToken.VALUE_STRING) {
            String str = jp.getText().trim();
            if (str.length() == 0) {
                return null;
            }
            return Joda.forPattern(formatString).parser().parseDateTime(str).toDate();
        }
        return super._parseDate(jp, ctxt);
    }


}