com.scudata.expression.mfn.dw.News 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.expression.mfn.dw;

import java.util.ArrayList;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.dm.cursor.ICursor;
import com.scudata.dm.cursor.MultipathCursors;
import com.scudata.dm.op.Operation;
import com.scudata.dw.ColPhyTable;
import com.scudata.dw.IPhyTable;
import com.scudata.dw.JoinCursor;
import com.scudata.dw.JoinCursor2;
import com.scudata.expression.Expression;
import com.scudata.expression.IParam;
import com.scudata.expression.Node;
import com.scudata.expression.ParamInfo2;
import com.scudata.expression.PhyTableFunction;
import com.scudata.expression.operator.And;
import com.scudata.resources.EngineMessage;

/**
 * ????A/cs?ļ?/άֵȡ??T???????ֶη??أ?A/cs??T?ļ?????
 * T.news(A/cs,x:C,??;w) T??A/cs?Ƕ??һ??ϵ??A/cs?ļ?¼?????T?Ķ?????¼
 * @author RunQian
 *
 */
public class News extends PhyTableFunction {
	public Object calculate(Context ctx) {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("news" + mm.getMessage("function.missingParam"));
		}
		if (table == null) {
			return table;
		}
		
		char type = param.getType();
		ICursor cursor = null;
		IParam param = this.param;
		Expression filter = null;
		String []fkNames = null;
		Sequence []codes = null;
		String []opts = null;
		
		if (type == IParam.Semicolon) {
			if (param.getSubSize() > 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("news" + mm.getMessage("function.invalidParam"));
			}
			
			IParam expParam = param.getSub(1);
			param = param.getSub(0);
			type = param.getType();
			
			if (expParam == null) {
			} else if (expParam.isLeaf()) {
				filter = expParam.getLeafExpression();
			} else {
				ArrayList expList = new ArrayList();
				ArrayList fieldList = new ArrayList();
				ArrayList codeList = new ArrayList();
				ArrayList optList = new ArrayList();
				
				if (expParam.getType() == IParam.Colon) {
					parseFilterParam(expParam, expList, fieldList, codeList, optList, "news", ctx);
				} else {
					for (int p = 0, psize = expParam.getSubSize(); p < psize; ++p) {
						IParam sub = expParam.getSub(p);
						parseFilterParam(sub, expList, fieldList, codeList, optList, "news", ctx);
					}
				}
				
				int fieldCount = fieldList.size();
				if (fieldCount > 0) {
					fkNames = new String[fieldCount];
					codes = new Sequence[fieldCount];
					opts = new String[fieldCount];
					fieldList.toArray(fkNames);
					codeList.toArray(codes);
					optList.toArray(opts);
				}
				
				int expCount = expList.size();
				if (expCount == 1) {
					filter = expList.get(0);
				} else if (expCount > 1) {
					Expression exp = expList.get(0);
					Node home = exp.getHome();
					for (int i = 1; i < expCount; ++i) {
						exp = expList.get(i);
						And and = new And();
						and.setLeft(home);
						and.setRight(exp.getHome());
						home = and;
					}
					
					filter = new Expression(home);
				}
			}
		}
		
		if (type == IParam.Comma) {
			if (param.getSubSize() < 2) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("news" + mm.getMessage("function.invalidParam"));
			}
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("news" + mm.getMessage("function.invalidParam"));
		}
		
		Object[] objs = New.parse1stParam(param, ctx);
		Object obj = objs[0];
		cursor = (ICursor) objs[1];
		String[] csNames = (String[]) objs[2];
		
		IParam newParam = param.create(1, param.getSubSize());
		ParamInfo2 pi = ParamInfo2.parse(newParam, "news", false, false);
		Expression []exps = pi.getExpressions1();
		String []names = pi.getExpressionStrs2();
		
		if (JoinCursor.isColTable(table)) {
			return news((ColPhyTable)table, cursor, obj, csNames, filter, exps,	names, fkNames, codes, opts, option, ctx);
		} else {
			return news(table, cursor, obj, csNames, filter, exps, names, fkNames, codes, opts, option, ctx);
		}
	}
	
	public static void parseFilterParam(IParam param, ArrayList expList, 
			ArrayList fieldList, ArrayList codeList, ArrayList optList, 
			String fname, Context ctx) {
		if (param == null) {
		} else if (param.isLeaf()) {
			expList.add(param.getLeafExpression());
		} else if (param.getType() == IParam.Colon) {
			int subSize = param.getSubSize();
			if (subSize > 3) {
				MessageManager mm = EngineMessage.get();
				throw new RQException(fname + mm.getMessage("function.invalidParam"));						
			}
			
			IParam sub0 = param.getSub(0);
			IParam sub1 = param.getSub(1);
			if (sub0 == null || sub1 == null) {
				MessageManager mm = EngineMessage.get();
				throw new RQException(fname + mm.getMessage("function.invalidParam"));
			}
			
			String fkName = sub0.getLeafExpression().getIdentifierName();
			fieldList.add(fkName);
			Object val = sub1.getLeafExpression().calculate(ctx);
			if (val instanceof Sequence) {
				codeList.add((Sequence)val);
			} else if (val == null) {
				codeList.add(new Sequence());
			} else {
				MessageManager mm = EngineMessage.get();
				throw new RQException(fname + mm.getMessage("function.paramTypeError"));
			}
			
			if (subSize > 2) {
				IParam sub2 = param.getSub(2);
				if (sub2 != null) {
					String opt = sub2.getLeafExpression().toString();
					optList.add(opt);
				} else {
					optList.add(null);
				}
			} else {
				optList.add(null);
			}
		}
	}
	
	public static Object news(ColPhyTable table, ICursor cursor, Object obj, String[] csNames, Expression filter, Expression []exps,
			String[] names, String []fkNames, Sequence []codes, String[] opts, String option, Context ctx) {
		int type = 2;
		if (cursor instanceof MultipathCursors) {
			type = 0x12;
			
			MultipathCursors mcursor = (MultipathCursors) cursor;
			ICursor cursors[] = mcursor.getCursors();
			int pathCount = cursors.length;
			for (int i = 0; i < pathCount; ++i) {
				Expression w = null;
				if (filter != null) {
					w = filter.newExpression(ctx); // ?ֶβ??ж?ȡʱ??Ҫ???Ʊ???ʽ??ͬһ??????ʽ??֧?ֲ???????
				}
				Expression[] exps_ = Operation.dupExpressions(exps, ctx);
				ICursor cs = cursors[i].attachNews(table, csNames, w, exps_, names, fkNames, codes, opts, option, type, ctx);
				cursors[i] = cs;
			}
			return new MultipathCursors(cursors, ctx);
		}
		
		ICursor cs = cursor.attachNews(table, csNames, filter, exps, names, fkNames, codes, opts, option, type, ctx);
		if (obj instanceof Sequence) {
			return cs.fetch();
		} else {
			return cs;
		}
	}
	
	public static Object news(IPhyTable table, ICursor cursor, Object obj, String[] csNames, Expression filter, Expression []exps,
			String[] names, String []fkNames, Sequence []codes, String[] opts, String option, Context ctx) {
		if (cursor instanceof MultipathCursors) {
			return JoinCursor2.makeMultiJoinCursor(table, exps, names, (MultipathCursors)cursor, csNames, filter, fkNames, codes, opts, 2, option, ctx);
		}
		ICursor cs = new JoinCursor2(table, exps, names, cursor, csNames, filter, fkNames, codes, opts, 2, option, ctx);
		if (obj instanceof Sequence) {
			return cs.fetch();
		} else {
			return cs;
		}
	}
}