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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.dm;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import com.scudata.common.DBSession;
import com.scudata.common.ISessionFactory;

/**
 * ?????õ?????????
 * @author WangXiaoJun
 *
 */
public class Context {
	private Context parent; // ????????
	private JobSpace js; // ??ҵ?ռ?
	private Map dbSessions = new HashMap();// DBSessionӳ??
	private Map dbsfs = new HashMap(); // ISessionFactoryӳ??

	private ParamList paramList = new ParamList(); // ?????б?
	private ComputeStack computeStack = new ComputeStack(); // ?????ջ
	private String defDsName; // ȱʡ???ݿ?????????

	private Random random; // ???????????ֵ
	private Param iterateParam = new Param(KeyWord.ITERATEPARAM, Param.VAR, null); // ????????
	
	/**
	 * ?????????Ķ???
	 */
	public Context() {
	}

	/**
	 * ?????????Ķ???, ?͸??????Ĺ????????
	 * @param parent ????????
	 */
	public Context(Context parent) {
		this.parent = parent;
	}

	/**
	 * ???ø???????
	 * @param parent Context
	 */
	public void setParent(Context parent) {
		this.parent = parent;
	}

	/**
	 * ȡ?ø???????????
	 * @return  ????????
	 */
	public Context getParent() {
		return parent;
	}

	/**
	 * ??????ȡ???ݿ??OLAP????
	 * @param dbName ???ݿ??OLAP??
	 * @return DataSourceConfig
	 */
	public DBSession getDBSession(String dbName) {
		DBSession ds = dbSessions.get(dbName);
		if (ds != null) return ds;

		if (parent != null) {
			return parent.getDBSession(dbName);
		} else {
			return null;
		}
	}

	/**
	 * ???????????ݿ?????
	 * @return Map name??DBSession
	 */
	public Map getDBSessionMap() {
		return dbSessions;
	}

	/**
	 * ???????????ݿ??OLAP????
	 * @param dbName ????Դ??
	 * @param dbSession ????Դ????
	 */
	public void setDBSession(String dbName, DBSession dbSession) {
		dbSessions.put(dbName, dbSession);
	}

	/**
	 * ɾ?????ݿ?????
	 * @param dbName String ???ݿ???????
	 * @return DBSession
	 */
	public DBSession removeDBSession(String dbName) {
		DBSession ds = dbSessions.remove(dbName);
		if (ds != null) return ds;
		return parent == null ? null : parent.removeDBSession(dbName);
	}

	/**
	 * ??ȡ???ݿ????ӹ???
	 * @param name String ???ݿ?????
	 * @return ISessionFactory ???ݿ????ӹ???
	 */
	public ISessionFactory getDBSessionFactory(String name) {
		ISessionFactory sf = dbsfs.get(name);
		if (sf != null) return sf;
		return parent == null ? null : parent.getDBSessionFactory(name);
	 }

	 /**
	  * ???????????ݿ????ӹ???
	  * @return Map name??ISessionFactory
	  */
	 public Map getDBSessionFactoryMap() {
		 return dbsfs;
	 }

	 /**
	  * ???????ݿ????ӹ???
	  * @param name String ???ݿ?????
	  * @param sf ISessionFactory ???ݿ????ӹ???
	  */
	 public void setDBSessionFactory(String name, ISessionFactory sf) {
		 dbsfs.put(name, sf);
	 }

	 /**
	  * ɾ?????ݿ????ӹ???
	  * @param name String
	  * @return ISessionFactory
	  */
	 public ISessionFactory removeDBSessionFactory(String name) {
		 ISessionFactory sf = dbsfs.remove(name);
		 if (sf != null) return sf;
		 return parent == null ? null : parent.removeDBSessionFactory(name);
	 }

	/**
	 * ??????ȡ????
	 * @param name ??????
	 * @return DataStruct
	 */
	public Param getParam(String name) {
		// ???ٴӸ???????ȡ
		// ??·?α????Լ????????ģ???????·?α????dfx?ٴ?????????·?α?????ʲ?????
		Param param = paramList.get(name);
		if (param != null) return param;
		return parent == null ? null : parent.getParam(name);
	}

	/**
	 * ???ز????б?
	 * @return ParamList
	 */
	public ParamList getParamList() {
		return paramList;
	}

	/**
	 * ???ò????б?
	 * @param list ParamList
	 */
	public void setParamList(ParamList list) {
		if (list == null) {
			this.paramList = new ParamList();
		} else {
			this.paramList = list;
		}
	}

	/**
	 * ???ӱ???
	 * @param param ????
	 */
	public void addParam(Param param) {
		paramList.add(param);
	}

	/**
	 * ??????ɾ??????
	 * @param name String
	 * @return Param
	 */
	public Param removeParam(String name) {
		return paramList.remove(name);
		// ???ٴӸ???????ɾ
		//if (param != null) return param;
		//return parent == null ? null : parent.removeParam(name);
	}

	/**
	 * ???ò?????ֵ????????????????????һ??VAR???͵Ĳ???
	 * @param name String
	 * @param value Object
	 */
	public void setParamValue(String name, Object value) {
		Param p = getParam(name);
		if (p == null) {
			addParam(new Param(name, Param.VAR, value));
		} else {
			p.setValue(value);
		}
	}

	/**
	 * ???ò?????ֵ????????????????????һ??paramType???͵Ĳ???
	 * @param name String
	 * @param value Object
	 * @param paramType byte Param.VAR  ARG
	 */
	public void setParamValue(String name, Object value, byte paramType) {
		Param p = getParam(name);
		if (p == null) {
			addParam(new Param(name, paramType, value));
		} else {
			p.setValue(value);
		}
	}

	/**
	 * ȡ?????ջ?????ڳ?Ա???????????ѹջ
	 * @return
	 */
	public ComputeStack getComputeStack() {
		return computeStack;
	}

	/**
	 * ????ȱʡ???ݿ?????????
	 * @return String
	 */
	public String getDefDBsessionName() {
		return this.defDsName;
	}

	/**
	 * ????ȱʡ???ݿ?????????
	 * @param dsn String
	 */
	public void setDefDBsessionName(String dsn) {
		this.defDsName = dsn;
	}

	/**
	 * ????ȱʡ???ݿ?????
	 * @return DBSession
	 */
	public DBSession getDefDBsession() {
		return getDBSession(defDsName);
	}

	// ????һ???????ӵ????ݿ?
	public DBSession getDBSession() {
		if (dbSessions.size() != 0) {
			return dbSessions.values().iterator().next();
		}

		if (parent != null) {
			return parent.getDBSession();
		} else {
			return null;
		}
	}

	/**
	 * ????random????
	 * @return Random
	 */
	public Random getRandom() {
		if (random == null) random = new Random();
		return random;
	}

	/**
	 * ???ظ?Ϊseed??random????
	 * @param seed long ??
	 * @return Random
	 */
	public Random getRandom(long seed) {
		if (random == null) {
			random = new Random(seed);
		} else {
			random.setSeed(seed);
		}

		return random;
	}

	/**
	 * ???ù????ռ?
	 * @param space ?????ռ?
	 */
	public void setJobSpace(JobSpace space) {
		this.js = space;
	}

	/**
	 * ȡ?????ռ?
	 * @return JobSpace
	 */
	public JobSpace getJobSpace() {
		return js;
	}

	/**
	 * ȡ??Դ??????
	 * @return ResourceManager
	 */
	public ResourceManager getResourceManager() {
		if (js != null) {
			return js.getResourceManager();
		} else {
			return null;
		}
	}
	
	/**
	 * ????ָ????Դ????Դ??????
	 * @param resource ??Դ
	 */
	public void addResource(IResource resource) {
		ResourceManager rm = getResourceManager();
		if (rm != null) {
			rm.add(resource);
		}
	}
	
	/**
	 * ??ָ????Դ????Դ????????ɾ??
	 * @param resource ??Դ
	 */
	public void removeResource(IResource resource) {
		ResourceManager rm = getResourceManager();
		if (rm != null) {
			rm.remove(resource);
		}
	}
	
	/**
	 * ?????µļ??㻷??
	 * @return Context
	 */
	public Context newComputeContext() {
		// ????ָ??thisΪ????func???ò??????????׵???StackOverflowError?쳣
		Context ctx = new Context();
		ctx.js = js;
		ctx.dbSessions = dbSessions;
		ctx.dbsfs = dbsfs;
		ctx.defDsName = defDsName;

		ParamList paramList = this.paramList;
		ParamList paramList2 = ctx.paramList;
		for (int i = 0, count = paramList.count(); i < count; ++i) {
			Param p = paramList.get(i);
			paramList2.add(new Param(p));
		}

		return ctx;
	}
	
	/**
	 * ????ָ???????ĵļ??㻷?????????Ʊ???
	 * @param ctx ??????????
	 */
	public void setEnv(Context ctx) {
		js = ctx.js;
		dbSessions = ctx.dbSessions;
		dbsfs = ctx.dbsfs;
		defDsName = ctx.defDsName;
	}

	/**
	 * ȡ????????
	 * @return Param
	 */
	public Param getIterateParam() {
		return iterateParam;
	}
}