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package cn.featherfly.conversion.string.format;

import cn.featherfly.common.lang.GenericType;
import cn.featherfly.conversion.string.AbstractToStringConvertor;
import cn.featherfly.conversion.string.ToStringConvertor;


/**
 * 
 * 格式化转换器
 * 
 * @param  转换对象
 * @author 钟冀
 */
public abstract class FormatConvertor extends AbstractToStringConvertor>{

    private ToStringConvertor convertor;
    
    /**
     * @param convertor convertor
     */
    public FormatConvertor(ToStringConvertor convertor) {
        this.convertor = convertor;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected boolean supportFor(GenericType generecType) {
        if (generecType == null) {
            return false;
        }
        return FormatType.class == generecType.getClass();
    }
    
    /**
     * {@inheritDoc}
     */
    @Override
    protected String doToString(T value, FormatType genericType) {
        String result = formatToString(value, genericType);
        if (result == null) {
            return convertor.sourceToTarget(value, null);
        }
        return result;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected T doToObject(String value, FormatType genericType) {
        T result = formatToObject(value, genericType);
        if (result == null) {
            return convertor.targetToSource(value, null);
        }
        return result;
    }

    /**
     * 返回convertor
     * @return convertor
     */
    public ToStringConvertor getConvertor() {
        return convertor;
    }
    
    /**
     * 
     * 对象转换为字符串
     * 
     * @param value 对象
     * @param genericType 指定对象的上下文属性
     * @return 字符串
     */
    protected abstract String formatToString(T value, FormatType genericType);
    /**
     * 
     * 字符串转换为对象
     * 
     * @param value 字符串
     * @param genericType 指定对象的上下文属性
     * @return 对象
     */
    protected abstract T formatToObject(String value, FormatType genericType);
}