net.shopxx.BaseAttributeConverter.java Source code

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Here is the source code for net.shopxx.BaseAttributeConverter.java

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/*
 * Copyright 2005-2015 shopxx.net. All rights reserved.
 * Support: http://3936242.01p.com/
 * License: http://3936242.01p.com/license
 */
package net.shopxx;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.persistence.AttributeConverter;

import net.shopxx.util.JsonUtils;

import org.apache.commons.lang.StringUtils;
import org.springframework.core.ResolvableType;

import com.fasterxml.jackson.databind.JavaType;

public abstract class BaseAttributeConverter<T> implements AttributeConverter<Object, String> {

    private JavaType javaType;

    public BaseAttributeConverter() {
        ResolvableType resolvableType = ResolvableType.forClass(getClass());
        Type type = resolvableType.getSuperType().getGeneric().getType();
        javaType = JsonUtils.constructType(type);
    }

    public String convertToDatabaseColumn(Object attribute) {
        if (attribute == null) {
            return null;
        }

        return JsonUtils.toJson(attribute);
    }

    public Object convertToEntityAttribute(String dbData) {
        if (StringUtils.isEmpty(dbData)) {
            if (List.class.isAssignableFrom(javaType.getRawClass())) {
                return Collections.EMPTY_LIST;
            } else if (Set.class.isAssignableFrom(javaType.getRawClass())) {
                return Collections.EMPTY_SET;
            } else if (Map.class.isAssignableFrom(javaType.getRawClass())) {
                return Collections.EMPTY_MAP;
            } else {
                return null;
            }
        }

        return JsonUtils.toObject(dbData, javaType);
    }

}