com.scudata.dm.DfxManager Maven / Gradle / Ivy

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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.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import com.scudata.cellset.datamodel.PgmCellSet;
import com.scudata.expression.Expression;

/**
 * dfx?????????
 */
public class DfxManager {
	private static DfxManager dfxManager = new DfxManager();
	private HashMap> dfxRefMap = 
		new HashMap>();

	private HashMap>> expListMap = 
			new HashMap>>();
	
	private DfxManager() {}

	/**
	 * ȡdfx?????????ʵ??
	 * @return DfxManager
	 */
	public static DfxManager getInstance() {
		return dfxManager;
	}

	/**
	 * ???????ĳ?????
	 */
	public void clear() {
		synchronized(dfxRefMap) {
			dfxRefMap.clear();
		}
	}
	
	/**
	 * ʹ????dfx???????????????
	 * @param dfx PgmCellSet
	 */
	public void putDfx(PgmCellSet dfx) {
		Context dfxCtx = dfx.getContext();
		dfxCtx.setParent(null);
		dfxCtx.setJobSpace(null);
		dfx.reset();

		synchronized(dfxRefMap) {
			dfxRefMap.put(dfx.getName(), new SoftReference(dfx));
		}
	}

	/**
	 * ?ӻ??????????ȡdfx??ʹ???????Ҫ????putDfx?????????????
	 * @param name dfx?ļ???
	 * @param ctx ??????????
	 * @return PgmCellSet
	 */
	public PgmCellSet removeDfx(String name, Context ctx) {
		PgmCellSet dfx = null;
		synchronized(dfxRefMap) {
			SoftReference sr = dfxRefMap.remove(name);
			if (sr != null) dfx = (PgmCellSet)sr.get();
		}

		if (dfx == null) {
			return readDfx(name, ctx);
		} else {
			// ???ٹ???ctx?еı???
			Context dfxCtx = dfx.getContext();
			dfxCtx.setEnv(ctx);
			return dfx;
		}
	}

	/**
	 * ?ӻ??????????ȡdfx??ʹ???????Ҫ????putDfx?????????????
	 * @param fo dfx?ļ?????
	 * @param ctx ??????????
	 * @return PgmCellSet
	 */
	public PgmCellSet removeDfx(FileObject fo, Context ctx) {
		PgmCellSet dfx = null;
		String name = fo.getFileName();
		synchronized(dfxRefMap) {
			SoftReference sr = dfxRefMap.remove(name);
			if (sr != null) dfx = (PgmCellSet)sr.get();
		}
		
		if (dfx == null) {
			return readDfx(fo, ctx);
		} else {
			// ???ٹ???ctx?еı???
			Context dfxCtx = dfx.getContext();
			dfxCtx.setEnv(ctx);
			return dfx;
		}
	}
	
	/**
	 * ??ȡdfx??????ʹ?û???
	 * @param fo dfx?ļ?????
	 * @param ctx ??????????
	 * @return PgmCellSet
	 */
	public PgmCellSet readDfx(FileObject fo, Context ctx) {
		PgmCellSet dfx = fo.readPgmCellSet();
		dfx.resetParam();
		
		// ???ٹ???ctx?еı???
		Context dfxCtx = dfx.getContext();
		dfxCtx.setEnv(ctx);
		return dfx;
	}
	
	/**
	 * ??ȡdfx??????ʹ?û???
	 * @param name dfx?ļ???
	 * @param ctx ??????????
	 * @return PgmCellSet
	 */
	public PgmCellSet readDfx(String name, Context ctx) {
		return readDfx(new FileObject(name, null, "s", ctx), ctx);
	}
	
	/**
	 * ȡ????ı???ʽ??????ʽ?????????Ҫ????putExpression?????黹????
	 * @param strExp ????ʽ??
	 * @param ctx ??????????
	 * @return Expression
	 */
	public Expression getExpression(String strExp, Context ctx) {
		synchronized(expListMap) {
			SoftReference> ref = expListMap.get(strExp);
			if (ref != null) {
				List expList = ref.get();
				if (expList != null && expList.size() > 0) {
					return expList.remove(expList.size() - 1);
				}
			}
		}
		
		return new Expression(ctx, strExp);
	}
	
	/**
	 * ????ʽ??????ɺ?ѱ???ʽ????????
	 * @param strExp ????ʽ??
	 * @param exp ????ʽ
	 */
	public void putExpression(String strExp, Expression exp) {
		synchronized(expListMap) {
			SoftReference> ref = expListMap.get(strExp);
			if (ref == null) {
				List expList = new ArrayList();
				expList.add(exp);
				ref = new SoftReference>(expList);
				expListMap.put(strExp, ref);
			} else {
				List expList = ref.get();
				if (expList == null) {
					expList = new ArrayList();
					expList.add(exp);
					ref = new SoftReference>(expList);
					expListMap.put(strExp, ref);
				} else {
					expList.add(exp);
				}
			}
		}
	}
}