com.scudata.dw.pseudo.PseudoBFile Maven / Gradle / Ivy

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SPL(Structured Process Language) A programming language specially for structured data computing.
There is a newer version: 20240823
package com.scudata.dw.pseudo;

import java.util.ArrayList;
import com.scudata.common.RQException;
import com.scudata.dm.BaseRecord;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.dm.cursor.BFileCursor;
import com.scudata.dm.cursor.ICursor;
import com.scudata.dm.cursor.MultipathCursors;
import com.scudata.dm.op.Operation;
import com.scudata.expression.Expression;

/**
 * ???ļ??????
 * @author LW
 *
 */
public class PseudoBFile extends PseudoTable {
	public PseudoBFile() {
	}
	
	/**
	 * ???????????
	 * @param rec ?????¼
	 * @param hs ?ֻ?????
	 * @param n ??????
	 * @param ctx
	 */
	public PseudoBFile(BaseRecord rec, int n, Context ctx) {
		pd = new PseudoDefination(rec, ctx);
		pathCount = n;
		this.ctx = ctx;
		extraNameList = new ArrayList();
		init();
	}

	public PseudoBFile(BaseRecord rec, PseudoTable mcs, Context ctx) {
		this(rec, 0, ctx);
		mcsTable = mcs;
	}
	
	public PseudoBFile(PseudoDefination pd, int n, Context ctx) {
		this.pd = pd;
		pathCount = n;
		this.ctx = ctx;
		extraNameList = new ArrayList();
		init();
	}

	/**
	 * ?õ??????ÿ??ʵ??????α깹?ɵ?????
	 * @return
	 */
	public ICursor[] getCursors() {
		throw new RQException("Never run to here.");
	}
	
	/**
	 * ????ȡ???ֶ?
	 * @param exps ȡ??????ʽ
	 * @param fields ȡ??????
	 */
//	protected void setFetchInfo_(Expression []exps, String []fields) {
//		this.exps = null;
//		this.names = null;
//		boolean needNew = extraNameList.size() > 0;
//		Expression newExps[] = null;
//		
//		extraOpList.clear();
//		
//		if (exps == null) {
//			if (fields == null) {
//				return;
//			} else {
//				int len = fields.length;
//				exps = new Expression[len];
//				for (int i = 0; i < len; i++) {
//					exps[i] = new Expression(fields[i]);
//				}
//			}
//		}
//		
//		newExps = exps.clone();//????һ??
//		
//		/**
//		 * ??ȡ??????ʽҲ??ȡ???ֶ?,????extraNameList???Ƿ????exps????ֶ?
//		 * ?????????ȥ??
//		 */
//		ArrayList tempList = new ArrayList();
//		for (String name : extraNameList) {
//			if (!tempList.contains(name)) {
//				tempList.add(name);
//			}
//		}
//		for (Expression exp : exps) {
//			String expName = exp.getIdentifierName();
//			if (tempList.contains(expName)) {
//				tempList.remove(expName);
//			}
//		}
//		
//		ArrayList tempNameList = new ArrayList();
//		int size = exps.length;
//		for (int i = 0; i < size; i++) {
//			Expression exp = exps[i];
//			String name = fields[i];
//			Node node = exp.getHome();
//			
//			if (node instanceof UnknownSymbol) {
//				String expName = exp.getIdentifierName();
//				if (!allNameList.contains(expName)) {
//					/**
//					 * ?????α?ֶ?????ת??
//					 */
//					PseudoColumn col = pd.findColumnByPseudoName(expName);
//					if (col != null) {
//						if (col.get_enum() != null) {
//							/**
//							 * ö???ֶ???ת??
//							 */
//							String var = "pseudo_enum_value_" + i;
//							ctx.setParamValue(var, col.get_enum());
//							name = col.getName();
//							newExps[i] = new Expression(var + "(" + name + ")");
//							exp = new Expression(name);
//							needNew = true;
//							tempNameList.add(name);
//						} else if (col.getBits() != null) {
//							/**
//							 * ??ֵ?ֶ???ת??
//							 */
//							name = col.getName();
//							String pname = ((UnknownSymbol) node).getName();
//							Sequence seq;
//							seq = col.getBits();
//							int idx = seq.firstIndexOf(pname) - 1;
//							int bit = 1 << idx;
//							String str = "and(" + col.getName() + "," + bit + ")!=0";//??Ϊ???ֶε?λ????
//							newExps[i] = new Expression(str);
//							exp = new Expression(name);
//							needNew = true;
//							tempNameList.add(name);
//						}
//					}
//				} else {
//					tempNameList.add(name);
//				}
//			}
//		}
//		
//		for (String name : tempList) {
//			if (!tempNameList.contains(name)) {
//				tempNameList.add(name);
//			}
//		}
//		
//		size = tempNameList.size();
//		
//		this.names = new String[size];
//		tempNameList.toArray(this.names);
//	
//		
//		if (needNew) {
//			New _new = new New(newExps, fields, null);
//			extraOpList.add(_new);
//		}
//		return;
//	}
	
	public ICursor cursor(Expression []exps, String []names) {
		return cursor(exps, names, false);
	}
	
	//??????????α?
	public ICursor cursor(Expression []exps, String []names, boolean isColumn) {
		ICursor cursor = null;
		setFetchInfo(exps, names);//??ȡ???ֶ????ӽ?ȥ????????ܻ??extraOpList??ֵ
		
		if (pathCount > 1) {//ָ???˲?????
			int count = pathCount;
			ICursor cursors[] = new ICursor[count];
			for (int i = 0; i < count; ++i) {
				if (this.exps == null && this.names == null) {
					cursors[i] = new BFileCursor(pd.getFileObject(), null, i + 1, count, null, ctx);
				} else {
					cursors[i] = new BFileCursor(pd.getFileObject(), this.names, i + 1, count, null, ctx);
				}
			}
			cursor = new MultipathCursors(cursors, ctx);
		} else {
			if (this.exps == null && this.names == null) {
				cursor = new BFileCursor(pd.getFileObject(), null, null, ctx);
			} else {
				cursor = new BFileCursor(pd.getFileObject(), this.names, null, ctx);
			}
		}

		this.addJoin(cursor);
		
		if (opList != null) {
			for (Operation op : opList) {
				cursor.addOperation(op, ctx);
			}
		}
		if (extraOpList != null) {
			for (Operation op : extraOpList) {
				cursor.addOperation(op, ctx);
			}
		}
		
		return cursor;
	}

	public Object clone(Context ctx) throws CloneNotSupportedException {
		PseudoBFile obj = new PseudoBFile();
		obj.hasPseudoColumns = hasPseudoColumns;
		obj.pathCount = pathCount;
		obj.mcsTable = mcsTable;
		obj.fkNames = fkNames == null ? null : fkNames.clone();
		obj.codes = codes == null ? null : codes.clone();
		cloneField(obj);
		obj.ctx = ctx;
		return obj;
	}
	
	public void append(ICursor cursor, String option) {
		pd.getFileObject().exportCursor(cursor, null, null, "ab", null, ctx);
	}
	
	public Sequence update(Sequence data, String opt) {
		throw new RQException("Never run to here."); 
	}
	
	public Sequence delete(Sequence data, String opt) {
		throw new RQException("Never run to here.");
	}
	
	public Pseudo addForeignKeys(String fkName, String []fieldNames, Object code, String[] codeKeys, boolean clone) {
		PseudoBFile table = null;
		try {
			table = clone ? (PseudoBFile) clone(ctx) : this;
			table.getPd().addPseudoColumn(new PseudoColumn(fkName, fieldNames, code, codeKeys));
		} catch (CloneNotSupportedException e) {
			e.printStackTrace();
		}
		return table;
	}
	
	/**
	 * ????????Ӧ???????ÿ?е?????????
	 * ע?⣺???ص????????Ե?һ????¼Ϊ׼
	 * @return
	 */
	public byte[] getFieldTypes() {
		ICursor cursor = new BFileCursor(pd.getFileObject(), null, null, ctx);
		Sequence data = cursor.fetch(1);
		cursor.close();
		
		if (data == null || data.length() == 0) {
			return null;
		}
		
		BaseRecord record = (BaseRecord) data.getMem(1);
		Object[] objs = record.getFieldValues();
		int len = objs.length;
		byte[] types = new byte[len];
		
		for (int i = 0; i < len; i++) {
			types[i] = PseudoTable.getProperDataType(objs[i]);
		}
		return types;
	}
}