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SPL(Structured Process Language) A programming language specially for structured data computing.
package com.scudata.expression;
import java.util.List;
import com.scudata.array.BoolArray;
import com.scudata.array.ConstArray;
import com.scudata.array.IArray;
import com.scudata.array.ObjectArray;
import com.scudata.common.DBSession;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.BaseRecord;
import com.scudata.dm.ComputeStack;
import com.scudata.dm.Context;
import com.scudata.dm.Current;
import com.scudata.dm.DBObject;
import com.scudata.dm.DataStruct;
import com.scudata.dm.IComputeItem;
import com.scudata.dm.LinkEntry;
import com.scudata.dm.Param;
import com.scudata.dm.ParamList;
import com.scudata.dm.Sequence;
import com.scudata.dm.Table;
import com.scudata.resources.EngineMessage;
import com.scudata.util.EnvUtil;
import com.scudata.util.Variant;
/**
* ????????ʽ??ʱ??û??????????ʶ????ʲô???????DZ???Ҳ???????ֶΡ?
* ???й??????ٸ??ݼ???????????ȷ?????ֶλ??DZ???
* @author WangXiaoJun
*
*/
public class UnknownSymbol extends Node {
private String name;
private IComputeItem computeItem; // ?ϴμ???ʱ??Ӧ?ļ??????
private int col = -1; // ?ϴμ????Ӧ???ֶ????????????????Ż?
private DataStruct prevDs; // ?ϴμ????Ӧ?????ݽṹ???????????Ż?
private Param param; // ?ϴμ????Ӧ?ı???
private DBObject db; // ?ϴμ????Ӧ?????ݿ?????
private boolean isField = false; // ?Ƿ??Ӧ?????ֶ?
public UnknownSymbol(String name) {
this.name = name;
}
public String getName() {
return name;
}
protected boolean containParam(String name) {
return name.equals(this.name);
}
protected void getUsedParams(Context ctx, ParamList resultList) {
Param param = EnvUtil.getParam(name, ctx);
if (param != null && resultList.get(name) == null) {
resultList.addVariable(name, param.getValue());
}
}
public void getUsedFields(Context ctx, List resultList) {
if (EnvUtil.getParam(name, ctx) == null && ctx.getDBSession(name) == null) {
resultList.add(name);
}
}
/**
* ???ñ???ʽ?????ڱ???ʽ???棬???ִ??ʹ?ò?ͬ???????ģ?????????????йصĻ?????Ϣ
*/
public void reset() {
computeItem = null;
col = -1; //
prevDs = null;
param = null;
db = null;
isField = false;
}
public byte calcExpValueType(Context ctx) {
return Expression.TYPE_UNKNOWN;
}
public Object calculate(Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?ļ?¼?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Object obj = computeItem.getCurrent();
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return cur.getNormalFieldValue(col);
} else if (obj instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)obj).length() == 0) {
return null;
}
obj = ((Sequence)obj).get(1);
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return cur.getNormalFieldValue(col);
} else if (obj == null) {
return null;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else if (obj == null) {
return null;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else {
// ??????????????ֶ??????ұ???
if (!isField) {
if (param != null) {
return param.getValue();
} else if (db != null) {
return db;
}
param = EnvUtil.getParam(name, ctx);
if (param != null) { // ????
return param.getValue();
}
// ???ݿ?????
DBSession dbs = ctx.getDBSession(name);
if (dbs != null) {
db = new DBObject(dbs);
return db;
}
isField = true;
}
// ?ֶ?
// ??һ??????????㻷???Ѹı?
boolean hasNull = false; // ?Ƿ??????е?һ????ԱΪ??
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
Object cur = item.getCurrent();
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
return r.getNormalFieldValue(col);
}
} else if (cur instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)cur).length() == 0) {
computeItem = item;
return null;
}
cur = ((Sequence)cur).get(1);
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
return r.getNormalFieldValue(col);
}
} else if (cur == null) {
hasNull = true;
}
} else if (cur == null) {
hasNull = true;
}
}
if (hasNull) {
return null;
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
}
// '=' ??ֵ????
public Object assign(Object value, Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?ļ?¼?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Object obj = computeItem.getCurrent();
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
cur.setNormalFieldValue(col, value);
} else if (obj instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)obj).length() == 0) {
return value;
}
obj = ((Sequence)obj).get(1);
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
cur.setNormalFieldValue(col, value);
} else if (obj != null) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else if (obj != null) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
return value;
} else if (param != null) {
param.setValue(value);
return value;
} else {
if (computeItem == null) {
param = EnvUtil.getParam(name, ctx); // ????
if (param != null) {
param.setValue(value);
return value;
}
}
// ??һ??????????㻷???Ѹı?
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
Object cur = item.getCurrent();
// ??ֵ?????????????????Ԫ??Ϊnull??
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
r.setNormalFieldValue(col, value);
return value;
}
} else if (cur instanceof Table) {
Table table = (Table)cur;
DataStruct ds = table.dataStruct();
col = ds.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = ds;
if (table.length() > 0) {
table.getRecord(1).setNormalFieldValue(col, value);
}
return value;
}
} else if (cur instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)cur).length() == 0) {
computeItem = item;
return value;
}
cur = ((Sequence)cur).get(1);
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
r.setNormalFieldValue(col, value);
return value;
}
}
}
}
// û???ҵ??ֶ??????????????????????
param = new Param(name, Param.VAR, value);
ctx.addParam(param);
return value;
}
}
// '+=' ??ֵ????
public Object addAssign(Object value, Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?ļ?¼?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Object obj = computeItem.getCurrent();
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
Object result = Variant.add(cur.getNormalFieldValue(col), value);
cur.setNormalFieldValue(col, result);
return result;
} else if (obj instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)obj).length() == 0) {
return value;
}
obj = ((Sequence)obj).get(1);
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
Object result = Variant.add(cur.getNormalFieldValue(col), value);
cur.setNormalFieldValue(col, result);
return result;
} else if (obj != null) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else if (obj != null) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
return value;
} else if (param != null) {
Object result = Variant.add(param.getValue(), value);
param.setValue(result);
return result;
} else {
if (computeItem == null) {
param = EnvUtil.getParam(name, ctx); // ????
if (param != null) {
Object result = Variant.add(param.getValue(), value);
param.setValue(result);
return result;
}
}
// ??һ??????????㻷???Ѹı?
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
Object cur = item.getCurrent();
// ??ֵ?????????????????Ԫ??Ϊnull??
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
Object result = Variant.add(r.getNormalFieldValue(col), value);
r.setNormalFieldValue(col, result);
return result;
}
} else if (cur instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)cur).length() == 0) {
computeItem = item;
return value;
}
cur = ((Sequence)cur).get(1);
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
Object result = Variant.add(r.getNormalFieldValue(col), value);
r.setNormalFieldValue(col, result);
return result;
}
}
}
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
}
public Object move(Move node, Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Current current = (Current)computeItem;
int pos = node.calculateIndex(current, ctx);
if (pos < 1) {
return null;
}
// ?????ǰԪ??????????ȡ???һ??Ԫ??
Object obj = current.get(pos);
if (obj instanceof Sequence) {
if (((Sequence)obj).length() == 0) {
return null;
} else {
obj = ((Sequence)obj).get(1);
}
}
if (obj instanceof BaseRecord) {
BaseRecord r = (BaseRecord)obj;
if (prevDs != r.dataStruct()) {
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return r.getNormalFieldValue(col);
} else if (obj == null) {
return null;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
}
if (param != null || (computeItem == null && (param = EnvUtil.getParam(name, ctx)) != null)) {
Object value = param.getValue();
if (!(value instanceof Sequence)) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("dot.seriesLeft"));
}
Current current = stack.getSequenceCurrent((Sequence)value);
if (current == null) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("engine.seriesNotInStack"));
}
int pos = node.calculateIndex(current, ctx);
return pos > 0 ? current.get(pos) : null;
}
// ?ֶ?
// ??һ??????????㻷???Ѹı?
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
if (item instanceof Current) { // series.(...)
Current current = (Current) item;
Object curObj = current.getCurrent();
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (curObj instanceof Sequence) {
if (((Sequence)curObj).length() > 0) {
curObj = ((Sequence)curObj).get(1);
} else {
curObj = null;
}
}
if (curObj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord) curObj;
col = cur.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = cur.dataStruct();
int pos = node.calculateIndex(current, ctx);
if (pos < 1) return null;
Object obj = current.get(pos);
if (obj == null) return null;
if (!(obj instanceof BaseRecord)) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
BaseRecord r = (BaseRecord)obj;
if (prevDs != r.dataStruct()) {
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return r.getNormalFieldValue(col);
}
} else if (curObj == null) {
computeItem = item;
int pos = node.calculateIndex(current, ctx);
if (pos < 1) return null;
Object obj = current.get(pos);
if (obj instanceof Sequence) {
if (((Sequence)obj).length() == 0) {
return null;
} else {
obj = ((Sequence)obj).get(1);
}
}
if (obj == null) return null;
if (!(obj instanceof BaseRecord)) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
BaseRecord r = ((BaseRecord)obj);
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
return r.getNormalFieldValue(col);
}
}
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
public Object moveAssign(Move node, Object value, Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Current current = (Current)computeItem;
int pos = node.calculateIndex(current, ctx);
if (pos < 1) return value;
// ?????ǰԪ??????????ȡ???һ??Ԫ??
Object obj = current.get(pos);
if (obj instanceof Sequence) {
if (((Sequence)obj).length() == 0) {
return value;
} else {
obj = ((Sequence)obj).get(1);
}
}
if (obj instanceof BaseRecord) {
BaseRecord r = (BaseRecord)obj;
if (prevDs != r.dataStruct()) {
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
r.setNormalFieldValue(col, value);
return value;
} else if (obj == null) {
return value;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
}
if (param != null || (computeItem == null && (param = EnvUtil.getParam(name, ctx)) != null)) {
Object obj = param.getValue();
if (!(obj instanceof Sequence)) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("dot.seriesLeft"));
}
Current current = stack.getSequenceCurrent((Sequence)obj);
if (current == null) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("engine.seriesNotInStack"));
}
int pos = node.calculateIndex(current, ctx);
if (pos > 0) current.assign(pos, value);
return value;
}
// ?ֶ?
// ??һ??????????㻷???Ѹı?
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
if (item instanceof Current) { // series.(...)
Current current = (Current) item;
Object curObj = current.getCurrent();
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (curObj instanceof Sequence) {
if (((Sequence)curObj).length() > 0) {
curObj = ((Sequence)curObj).get(1);
} else {
curObj = null;
}
}
if (curObj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord) curObj;
col = cur.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = cur.dataStruct();
int pos = node.calculateIndex(current, ctx);
if (pos < 1) return value;
Object obj = current.get(pos);
if (obj == null) return value;
if (!(obj instanceof BaseRecord)) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
BaseRecord r = (BaseRecord)obj;
if (prevDs != r.dataStruct()) {
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
r.setNormalFieldValue(col, value);
return value;
}
} else if (curObj == null) {
computeItem = item;
int pos = node.calculateIndex(current, ctx);
if (pos < 1) return value;
Object obj = current.get(pos);
if (obj instanceof Sequence) {
if (((Sequence)obj).length() == 0) {
return value;
} else {
obj = ((Sequence)obj).get(1);
}
}
if (obj == null) return value;
if (!(obj instanceof BaseRecord)) {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
BaseRecord r = (BaseRecord)obj;
prevDs = r.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
r.setNormalFieldValue(col, value);
return value;
}
}
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
public Object moves(Move node, Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Current current = (Current)computeItem;
int []range = node.calculateIndexRange(current, ctx);
if (range == null) return new Sequence(0);
return Move.getFieldValues(current, name, range[0], range[1]);
}
if (param != null || (computeItem == null && (param = EnvUtil.getParam(name, ctx)) != null)) {
Object value = param.getValue();
if (!(value instanceof Sequence)) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("dot.seriesLeft"));
}
Current current = stack.getSequenceCurrent((Sequence)value);
if (current == null) {
MessageManager mm = EngineMessage.get();
throw new RQException("[]" + mm.getMessage("engine.seriesNotInStack"));
}
int []range = node.calculateIndexRange(current, ctx);
if (range == null) return new Sequence(0);
int startSeq = range[0];
int endSeq = range[1];
Sequence result = new Sequence(endSeq - startSeq + 1);
for (; startSeq <= endSeq; ++startSeq) {
result.add(current.get(startSeq));
}
return result;
}
// ?ֶ?
// ??һ??????????㻷???Ѹı?
for (LinkEntry entry = stack.getStackHeadEntry(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
if (item instanceof Current) { // series.(...)
Current current = (Current) item;
Object curObj = current.getCurrent();
if (curObj instanceof Sequence) {
if (((Sequence)curObj).length() == 0) {
curObj = null;
} else {
curObj = ((Sequence)curObj).get(1);
}
}
if (curObj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord) curObj;
col = cur.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
//prevRecord = cur;
int []range = node.calculateIndexRange(current, ctx);
if (range == null) return new Sequence(0);
return Move.getFieldValues(current, name, range[0], range[1]);
}
} else if (curObj == null) {
computeItem = item;
int []range = node.calculateIndexRange(current, ctx);
if (range == null) return new Sequence(0);
return Move.getFieldValues(current, name, range[0], range[1]);
}
}
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
public int getCol() {
return col;
}
/**
* ????signArray??ȡֵΪsign????
* @param ctx
* @param signArray ?б?ʶ????
* @param sign ??ʶ
* @return IArray
*/
public IArray calculateAll(Context ctx, IArray signArray, boolean sign) {
return calculateAll(ctx);
}
/**
* ?????????????&&???Ҳ????ʽ
* @param ctx ??????????
* @param leftResult &&??????ʽ?ļ?????
* @return BoolArray
*/
public BoolArray calculateAnd(Context ctx, IArray leftResult) {
BoolArray result = leftResult.isTrue();
IArray array = calculateAll(ctx);
for (int i = 1, size = result.size(); i <= size; ++i) {
if (result.isTrue(i) && array.isFalse(i)) {
result.set(i, false);
}
}
return result;
}
/**
* ??????????еĽ??
* @param ctx ??????????
* @return IArray
*/
public IArray calculateAll(Context ctx) {
if (!isField) {
if (param != null) { // ????
Sequence sequence = ctx.getComputeStack().getTopSequence();
return new ConstArray(param.getValue(), sequence.length());
} else if (db != null) { // ???ݿ?????
Sequence sequence = ctx.getComputeStack().getTopSequence();
return new ConstArray(db, sequence.length());
}
param = EnvUtil.getParam(name, ctx);
if (param != null) { // ????
Sequence sequence = ctx.getComputeStack().getTopSequence();
return new ConstArray(param.getValue(), sequence.length());
}
// ???ݿ?????
DBSession dbs = ctx.getDBSession(name);
if (dbs != null) {
Sequence sequence = ctx.getComputeStack().getTopSequence();
db = new DBObject(dbs);
return new ConstArray(db, sequence.length());
}
isField = true;
}
// ????calculateAllʱջ??????϶???????
ComputeStack stack = ctx.getComputeStack();
Sequence sequence = stack.getTopSequence();
if (sequence.containField(name)) {
return sequence.getFieldValueArray(name);
}
int len = sequence.length();
if (len == 0) {
ObjectArray array = new ObjectArray(0);
array.setTemporary(true);
return array;
}
int i = 1;
IArray result = null;
DataStruct ds = null;
int col = -1;
// ?ҳ???һ???ǿյij?Ա???ж??Ƿ??е?ǰ?ֶ?
// ??Ա?????Ǽ?¼??????
for (; i <= len; ++i) {
Object mem = sequence.getMem(i);
if (mem instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
Sequence tmp = (Sequence)mem;
if (tmp.length() > 0) {
mem = tmp.getMem(1);
} else {
mem = null;
}
}
if (mem instanceof BaseRecord) {
BaseRecord r = (BaseRecord)mem;
ds = r.dataStruct();
col = ds.getFieldIndex(name);
if (col != -1) {
result = new ObjectArray(len);
result.setTemporary(true);
for (int j = 1; j < i; ++j) {
result.push(null);
}
result.push(r.getNormalFieldValue(col));
}
break;
} else if (mem != null) {
// A.(B.(...))?????ϲ????е??ֶ?
break;
}
}
if (result != null) {
// ??һ???ǿյij?Ա???е?ǰ?ֶ?
for (++i; i <= len; ++i) {
Object mem = sequence.getMem(i);
if (mem instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
Sequence tmp = (Sequence)mem;
if (tmp.length() > 0) {
mem = tmp.getMem(1);
} else {
mem = null;
}
}
if (mem instanceof BaseRecord) {
BaseRecord r = (BaseRecord)mem;
if (r.dataStruct() != ds) {
ds = r.dataStruct();
col = ds.getFieldIndex(name);
if (col == -1) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
result.push(r.getNormalFieldValue(col));
} else if (mem != null) {
result.push(null);
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return result;
} else {
// A.(B.(...))?????ϲ????е??ֶ?
Object value = getOuterFieldValue(ctx);
result = new ConstArray(value, len);
result.setTemporary(true);
return result;
}
}
// ȡ??????е??ֶ?ֵ
private Object getOuterFieldValue(Context ctx) {
// ????ϴμ??????ʽʱ??Ӧ?ļ?¼?????л??ڶ?ջ????ʹ???ϴε?
ComputeStack stack = ctx.getComputeStack();
if (computeItem != null && computeItem.isInStack(stack)) {
Object obj = computeItem.getCurrent();
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return cur.getNormalFieldValue(col);
} else if (obj instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)obj).length() == 0) {
return null;
}
obj = ((Sequence)obj).get(1);
if (obj instanceof BaseRecord) {
BaseRecord cur = (BaseRecord)obj;
if (prevDs != cur.dataStruct()) {
prevDs = cur.dataStruct();
col = prevDs.getFieldIndex(name);
if (col < 0) {
MessageManager mm = EngineMessage.get();
throw new RQException(name + mm.getMessage("ds.fieldNotExist"));
}
}
return cur.getNormalFieldValue(col);
} else if (obj == null) {
return null;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else if (obj == null) {
return null;
} else {
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
} else {
// ?ֶ?
// ??һ??????????㻷???Ѹı?
boolean hasNull = false; // ?Ƿ??????е?һ????ԱΪ??
LinkEntry entry = stack.getStackHeadEntry();
for (entry = entry.getNext(); entry != null; entry = entry.getNext()) {
IComputeItem item = entry.getElement();
Object cur = item.getCurrent();
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
return r.getNormalFieldValue(col);
}
} else if (cur instanceof Sequence) {
// ?????ǰԪ??????????ȡ???һ??Ԫ??
if (((Sequence)cur).length() == 0) {
computeItem = item;
return null;
}
cur = ((Sequence)cur).get(1);
if (cur instanceof BaseRecord) {
BaseRecord r = (BaseRecord) cur;
col = r.getFieldIndex(name);
if (col >= 0) {
computeItem = item;
prevDs = r.dataStruct();
return r.getNormalFieldValue(col);
}
} else if (cur == null) {
hasNull = true;
}
} else if (cur == null) {
hasNull = true;
}
}
if (hasNull) {
return null;
}
MessageManager mm = EngineMessage.get();
throw new RQException(mm.getMessage("Expression.unknownExpression") + name);
}
}
/**
* ???ؽڵ??Ƿ???????
* @return true???ǵ????????ģ?false??????
*/
public boolean isMonotone() {
return true;
}
}