import android.database.Cursor;
import org.json.JSONObject;
/**
* 应该是同步操作的基础数据类型，定义了相关指示同步操作的常量
* 关键字：abstract
*/
public abstract class Node {
//定义了各种用于表征同步状态的常量
public static final int SYNC_ACTION_NONE = 0;// 本地和云端都无可更新内容（即本地和云端内容一致）
public static final int SYNC_ACTION_ADD_REMOTE = 1;// 需要在远程云端增加内容
public static final int SYNC_ACTION_ADD_LOCAL = 2;// 需要在本地增加内容
public static final int SYNC_ACTION_DEL_REMOTE = 3;// 需要在远程云端删除内容
public static final int SYNC_ACTION_DEL_LOCAL = 4;// 需要在本地删除内容
public static final int SYNC_ACTION_UPDATE_REMOTE = 5;// 需要将本地内容更新到远程云端
public static final int SYNC_ACTION_UPDATE_LOCAL = 6;// 需要将远程云端内容更新到本地
public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;// 同步出现冲突
public static final int SYNC_ACTION_ERROR = 8;// 同步出现错误
private String mGid;
private String mName;
private long mLastModified;//记录最后一次修改时间
private boolean mDeleted;//表征是否被删除
public Node() {
mGid = null;
mName = "";
mLastModified = 0;
mDeleted = false;
}
public abstract JSONObject getCreateAction(int actionId);
public abstract JSONObject getUpdateAction(int actionId);
public abstract void setContentByRemoteJSON(JSONObject js);
public abstract void setContentByLocalJSON(JSONObject js);
public abstract JSONObject getLocalJSONFromContent();
public abstract int getSyncAction(Cursor c);
public void setGid(String gid) {
this.mGid = gid;
}
public void setName(String name) {
this.mName = name;
}
public void setLastModified(long lastModified) {
this.mLastModified = lastModified;
}
public void setDeleted(boolean deleted) {
this.mDeleted = deleted;
}
public String getGid() {
return this.mGid;
}
public String getName() {
return this.mName;
}
public long getLastModified() {
return this.mLastModified;
}
public boolean getDeleted() {
return this.mDeleted;
}
}
public class MetaData extends Task {
/*
* 功能描述：得到类的简写名称存入字符串TAG中
* 实现过程：调用getSimpleName ()函数
*/
private final static String TAG = MetaData.class.getSimpleName();
private String mRelatedGid = null;
/*
* 功能描述：设置数据，即生成元数据库
* 实现过程：调用JSONObject库函数put ()，Task类中的setNotes ()和setName ()函数
* 参数注解：
*/
public void setMeta(String gid, JSONObject metaInfo)
{
//对函数块进行注释
try {
metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
/*
* 将这对键值放入metaInfo这个jsonobject对象中
*/
} catch (JSONException e) {
Log.e(TAG, "failed to put related gid");
/*
* 输出错误信息
*/
}
setNotes(metaInfo.toString());
setName(GTaskStringUtils.META_NOTE_NAME);
}
/*
* 功能描述：获取相关联的Gid
*/
public String getRelatedGid() {
return mRelatedGid;
}
/*
* 功能描述：判断当前数据是否为空，若为空则返回真即值得保存
* Made By CuiCan
*/
@Override
public boolean isWorthSaving() {
return getNotes() != null;
}
/*
* 功能描述：使用远程json数据对象设置元数据内容
* 实现过程：调用父类Task中的setContentByRemoteJSON ()函数，并
* 参数注解：
*/
@Override
public void setContentByRemoteJSON(JSONObject js) {
super.setContentByRemoteJSON(js);
if (getNotes() != null) {
try {
JSONObject metaInfo = new JSONObject(getNotes().trim());
mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
} catch (JSONException e) {
Log.w(TAG, "failed to get related gid");
/*
* 输出警告信息
*/
mRelatedGid = null;
}
}
}
/*
* 功能描述：使用本地json数据对象设置元数据内容，一般不会用到，若用到，则抛出异常
* Made By CuiCan
*/
@Override
public void setContentByLocalJSON(JSONObject js) {
// this function should not be called
throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
/*
* 传递非法参数异常
*/
}
/*
* 功能描述：从元数据内容中获取本地json对象，一般不会用到，若用到，则抛出异常
* Made By CuiCan
*/
@Override
public JSONObject getLocalJSONFromContent() {
throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
/*
* 传递非法参数异常
* Made By Cui Can
*/
}
/*
* 功能描述：获取同步动作状态，一般不会用到，若用到，则抛出异常
* Made By CuiCan
*/
@Override
public int getSyncAction(Cursor c) {
throw new IllegalAccessError("MetaData:getSyncAction should not be called");
/*
* 传递非法参数异常
* Made By Cui Can
*/
}
}
