JSONFeature.java

package org.test4j.json.helper;

import java.util.ArrayList;
import java.util.List;

/**
 * json编码特性
 * 
 * @author darui.wudr
 */
public enum JSONFeature {
    /**
     * 标记对应的class类型<br>
     * eg: "#class:org.test4j.bean.User"
     */
    UnMarkClassFlag,

    /**
     * 给字段名称加引号<br>
     * "fiendname":"fieldvalue"
     */
    QuoteAllItems,

    /**
     * 用单引号替代双引号<br>
     * 'fieldname':'fieldvalue'
     */
    UseSingleQuote,

    /**
     * 忽略null字段和属性
     */
    SkipNullValue,
    /**
     * 是否忽略显式的字段类型输出<br>
     * 当field字段类型等于实际对象的类型时
     */
    IgnoreExplicitFieldType;

    private JSONFeature() {
        mask = (1 << ordinal());
    }

    private final int mask;

    public final int getMask() {
        return mask;
    }

    /**
     * 根据掩码值判断某个特性是否有效
     * 
     * @param features
     * @param feature
     * @return
     */
    public static boolean isEnabled(int features, JSONFeature feature) {
        return (features & feature.getMask()) != 0;
    }

    /**
     * 返回特性值的掩码
     * 
     * @param features
     * @return
     */
    public static int getFeaturesMask(JSONFeature... features) {
        int marks = 0;
        for (JSONFeature feature : features) {
            int mark = feature.mask;
            marks = marks | mark;
        }
        return marks;
    }

    /**
     * 根据掩码值返回特性列表
     * 
     * @param features
     * @return
     */
    public static List<JSONFeature> getSerializerFeatures(int features) {
        JSONFeature[] values = JSONFeature.values();
        List<JSONFeature> list = new ArrayList<JSONFeature>();
        for (JSONFeature value : values) {
            boolean isEnabled = isEnabled(features, value);
            if (isEnabled) {
                list.add(value);
            }
        }
        return list;
    }

    /**
     * 类型标识
     */
    public static final String ClazzFlag = "#class";

    /**
     * 单值标识
     */
    public static final String ValueFlag = "#value";

    /**
     * 引用标识
     */
    public static final String ReferFlag = "#refer";

    /**
     * 异常标识
     */
    public static final String ErrroFlag = "#error";
}