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com.scudata.expression.mfn.file.CreateCursor Maven / Gradle / Ivy
SPL(Structured Process Language) A programming language specially for structured data computing.
package com.scudata.expression.mfn.file;
import java.util.ArrayList;
import com.scudata.cellset.ICellSet;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.common.Types;
import com.scudata.dm.Context;
import com.scudata.dm.Env;
import com.scudata.dm.FileObject;
import com.scudata.dm.Sequence;
import com.scudata.dm.cursor.BFileCursor;
import com.scudata.dm.cursor.FileCursor;
import com.scudata.dm.cursor.ICursor;
import com.scudata.dm.cursor.MemoryCursor;
import com.scudata.dm.cursor.MultipathCursors;
import com.scudata.dm.query.SimpleSQL;
import com.scudata.expression.Expression;
import com.scudata.expression.FileFunction;
import com.scudata.expression.IParam;
import com.scudata.expression.ParamInfo3;
import com.scudata.resources.EngineMessage;
/**
* ?????ļ??α꣬?ļ????????ı??ļ??????ļ?
* f.cursor(Fi:type:fmt,??;k:n,s)
* @author RunQian
*
*/
public class CreateCursor extends FileFunction {
public Object calculate(Context ctx) {
return createCursor("cursor", file, cs, param, option, ctx);
}
private static ICursor createSimpleSQLCursor(FileObject fo, ICellSet cs, IParam param, String option, Context ctx) {
if (param == null) {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.missingParam"));
} else if (param.getType() == IParam.Normal) { // û?в???
Object obj = param.getLeafExpression().calculate(ctx);
if (!(obj instanceof String)) {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.paramTypeError"));
}
SimpleSQL lq = new SimpleSQL(cs, (String)obj, null, ctx);
Object val = lq.execute();
if (val instanceof ICursor) {
return (ICursor)val;
} else if (val instanceof Sequence) {
return new MemoryCursor((Sequence)val);
} else if (val == null) {
return null;
} else {
Sequence seq = new Sequence(1);
seq.add(val);
return new MemoryCursor(seq);
}
} else if (param.getType() == IParam.Comma) {
IParam sub0 = param.getSub(0);
if (sub0 == null || !sub0.isLeaf()) {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.invalidParam"));
}
Object obj = sub0.getLeafExpression().calculate(ctx);
if (!(obj instanceof String)) {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.paramTypeError"));
}
String strSql = (String)obj;
int paramSize = param.getSubSize() - 1;
ArrayList list = new ArrayList(paramSize);
for (int i = 0; i < paramSize; ++i) {
IParam sub = param.getSub(i + 1);
if (sub == null || !sub.isLeaf()) {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.invalidParam"));
}
Object p = sub.getLeafExpression().calculate(ctx);
list.add(p);
}
SimpleSQL lq = new SimpleSQL(cs, strSql, list, ctx);
Object val = lq.execute();
if (val instanceof ICursor) {
return (ICursor)val;
} else if (val instanceof Sequence) {
return new MemoryCursor((Sequence)val);
} else if (val == null) {
return null;
} else {
Sequence seq = new Sequence(1);
seq.add(val);
return new MemoryCursor(seq);
}
} else {
MessageManager mm = EngineMessage.get();
throw new RQException("cursor" + mm.getMessage("function.invalidParam"));
}
}
public static ICursor createCursor(String fnName, FileObject fo, ICellSet cs, IParam param, String option, Context ctx) {
if (fo.getIsSimpleSQL()) {
return createSimpleSQLCursor(fo, cs, param, option, ctx);
}
boolean isBinary = false, isMultiThread = false;
if (option != null) {
if (option.indexOf('m') != -1) isMultiThread = true;
if (option.indexOf('b') != -1 || option.indexOf('z') != -1) isBinary = true;
}
IParam fieldParam = param;
IParam segParam = null;
IParam sParam = null;
if (param != null && param.getType() == IParam.Semicolon) {
if (param.getSubSize() != 2) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.invalidParam"));
}
fieldParam = param.getSub(0);
IParam p = param.getSub(1);
if (p == null) {
} else if (p.getType() == IParam.Comma) {
if (p.getSubSize() != 2) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.invalidParam"));
}
segParam = p.getSub(0);
IParam sub1 = p.getSub(1);
if (sub1 != null) {
if (!sub1.isLeaf()) {
MessageManager mm = EngineMessage.get();
//throw new RQException(function + mm.getMessage("function.invalidParam"));
throw new RQException(fnName + mm.getMessage("function.paramChanged"));
}
sParam = sub1;
}
} else {
segParam = p;
}
}
String []fields = null;
byte []types = null;
String []fmts = null;
int segSeq = 1;
int segCount = 1;
String s = null;
if (fieldParam != null) {
ParamInfo3 pi = ParamInfo3.parse(fieldParam, "cursor", true, false, false);
fields = pi.getExpressionStrs1();
String []typeNames = pi.getExpressionStrs2();
int fcount = fields.length;
Expression []exps = pi.getExpressions3();
for (int i = 0; i < fcount; ++i) {
String type = typeNames[i];
if (type == null) continue;
if (types == null) types = new byte[fcount];
if (type.equals("string")) {
types[i] = Types.DT_STRING;
} else if (type.equals("int")) {
types[i] = Types.DT_INT;
} else if (type.equals("float")) {
types[i] = Types.DT_DOUBLE;
} else if (type.equals("long")) {
types[i] = Types.DT_LONG;
} else if (type.equals("decimal")) {
types[i] = Types.DT_DECIMAL;
} else if (type.equals("date")) {
types[i] = Types.DT_DATE;
} else if (type.equals("datetime")) {
types[i] = Types.DT_DATETIME;
} else if (type.equals("time")) {
types[i] = Types.DT_TIME;
} else if (type.equals("bool")) {
types[i] = Types.DT_BOOLEAN;
} else {
try {
int len = Integer.parseInt(type);
if (len < 1) {
MessageManager mm = EngineMessage.get();
throw new RQException(type + mm.getMessage("engine.unknownType"));
}
types[i] = Types.DT_SERIALBYTES;
if (fmts == null) {
fmts = new String[fcount];
}
fmts[i] = type;
} catch (NumberFormatException e) {
MessageManager mm = EngineMessage.get();
throw new RQException(type + mm.getMessage("engine.unknownType"));
}
}
if (exps[i] != null) {
Object obj = exps[i].calculate(ctx);
if (!(obj instanceof String)) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.paramTypeError"));
}
if (fmts == null) {
fmts = new String[fcount];
}
fmts[i] = (String)obj;
}
}
}
if (segParam == null) {
if (isMultiThread) {
segCount = Env.getCursorParallelNum();
}
} else if (segParam.isLeaf()) {
if (!isMultiThread) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.invalidParam"));
}
Object obj = segParam.getLeafExpression().calculate(ctx);
if (!(obj instanceof Number)) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.paramTypeError"));
}
segCount = ((Number)obj).intValue();
} else {
if (segParam.getSubSize() != 2) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.invalidParam"));
}
IParam sub0 = segParam.getSub(0);
IParam sub1 = segParam.getSub(1);
if (sub0 != null && sub1 != null) {
Object obj = sub0.getLeafExpression().calculate(ctx);
if (!(obj instanceof Number)) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.paramTypeError"));
}
segSeq = ((Number)obj).intValue();
obj = sub1.getLeafExpression().calculate(ctx);
if (!(obj instanceof Number)) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.paramTypeError"));
}
segCount = ((Number)obj).intValue();
isMultiThread = false;
} else if (sub0 != null || sub1 != null) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.invalidParam"));
}
}
if (sParam != null) {
Object obj = sParam.getLeafExpression().calculate(ctx);
if (obj != null && !(obj instanceof String)) {
MessageManager mm = EngineMessage.get();
throw new RQException(fnName + mm.getMessage("function.paramTypeError"));
}
s = (String)obj;
}
if (isMultiThread && segCount > 1) {
ICursor []cursors = new ICursor[segCount];
if (isBinary) {
for (int i = 0; i < segCount; ++i) {
cursors[i] = new BFileCursor(fo, fields, i + 1, segCount, option, ctx);
}
} else {
for (int i = 0; i < segCount; ++i) {
FileCursor cursor = new FileCursor(fo, i + 1, segCount, fields, types, s, option, ctx);
cursor.setFormats(fmts);
cursors[i] = cursor;
}
}
return new MultipathCursors(cursors, ctx);
} else {
if (isBinary) {
return new BFileCursor(fo, fields, segSeq, segCount, option, ctx);
} else {
FileCursor cursor = new FileCursor(fo, segSeq, segCount, fields, types, s, option, ctx);
cursor.setFormats(fmts);
return cursor;
}
}
}
}
