private void putLogicalOnStack(
TermMap left, TermMap right, Class<? extends BinaryExpression> logicalClass) {
try {
BinaryExpression logical = logicalClass.newInstance();
logical.setLeftExpression(DataTypeHelper.uncast(left.getLiteralValBool()));
logical.setRightExpression(DataTypeHelper.uncast(right.getLiteralValBool()));
tms.push(tmf.createBoolTermMap(logical));
} catch (InstantiationException | IllegalAccessException e) {
log.error("Error creating logical operator", e);
}
}
public OutputStream getOutputStream() {
OutputStream outputStream = null;
try {
outputStream = DataTypeHelper.writeString(content); // 将String转换成ByteArrayOutputStream
} catch (Exception ex) {
}
return outputStream;
}
private Expression isExpressionBound(Expression expr) {
expr = DataTypeHelper.uncast(expr);
// date col check
if (optConf.shortcutFilters && expr instanceof NullValue) {
// do nothing
return new StringExpression("false");
}
if (optConf.shortcutFilters
&& (DataTypeHelper.constantValueExpressions.contains(expr.getClass()))) {
// constant value detected is therefore bound
return new StringExpression("true");
} else {
IsNullExpression isNullExpr = new IsNullExpression();
isNullExpr.setLeftExpression(expr);
isNullExpr.setNot(true);
return isNullExpr;
}
}
private void putArithmeticOnStack(
TermMap left, TermMap right, Class<? extends BinaryExpression> arithmeticOp) {
try {
BinaryExpression arithmetical = arithmeticOp.newInstance();
arithmetical.setLeftExpression(DataTypeHelper.uncast(right.getLiteralValNumeric()));
arithmetical.setRightExpression(DataTypeHelper.uncast(left.getLiteralValNumeric()));
// for division we always return decimal
if (arithmeticOp.equals(Division.class)) {
Expression datatype =
dth.cast(
new StringValue("'" + XSDDatatype.XSDdecimal.getURI() + "'"),
dth.getStringCastType());
tms.push(tmf.createNumericalTermMap(arithmetical, datatype));
} else {
// determine the datatype
if (optConf.isShortcutFilters()) {
// check if we can determine the datatype of both parameters
Expression dtLeft = DataTypeHelper.uncast(left.getLiteralType());
Expression dtRight = DataTypeHelper.uncast(right.getLiteralType());
if (DataTypeHelper.constantValueExpressions.contains(dtLeft.getClass())
&& DataTypeHelper.constantValueExpressions.contains(dtRight.getClass())) {
if (dtLeft.toString().equals(dtRight.toString())) {
// the same, so we use
tms.push(tmf.createNumericalTermMap(arithmetical, dtLeft));
} else {
// we just use decimal
Expression datatype =
dth.cast(
new StringValue("'" + XSDDatatype.XSDdecimal.getURI() + "'"),
dth.getStringCastType());
tms.push(tmf.createNumericalTermMap(arithmetical, datatype));
}
return;
}
}
// it was not possible to short, so create the dynamic datatype expression
CaseExpression datatypeCase = new CaseExpression();
WhenClause datatypeEquals = new WhenClause();
EqualsTo datatypesAreEqualwhen = new EqualsTo();
datatypesAreEqualwhen.setLeftExpression(left.getLiteralType());
Expression datatypesEqualThen = left.getLiteralType();
datatypeEquals.setWhenExpression(datatypesAreEqualwhen);
datatypeEquals.setThenExpression(datatypesEqualThen);
Expression elseDataType = new StringValue("'" + XSDDatatype.XSDdecimal.getURI() + "'");
datatypeCase.setWhenClauses(Arrays.asList((Expression) datatypeEquals));
datatypeCase.setElseExpression(elseDataType);
tms.push(tmf.createNumericalTermMap(arithmetical, datatypeCase));
}
} catch (InstantiationException | IllegalAccessException e) {
log.error("Error creating arithmetic operator", e);
}
}
@Override
public void visit(ExprFunction1 func) {
if (func instanceof E_Bound) {
TermMap boundCheck = tms.pop();
tms.push(translateIsBound(boundCheck));
} else if (func instanceof E_LogicalNot) {
TermMap notCheck = tms.pop();
Expression bool = DataTypeHelper.uncast(notCheck.getLiteralValBool());
if (bool instanceof IsNullExpression) {
((IsNullExpression) bool).setNot(!((IsNullExpression) bool).isNot());
} else {
Parenthesis parenthesis = new Parenthesis(bool);
parenthesis.setNot();
notCheck = tmf.createBoolTermMap(parenthesis);
}
tms.push(notCheck);
} else if (func instanceof E_Lang) {
TermMap langFunc = tms.pop();
Expression lang = DataTypeHelper.uncast(langFunc.getLiteralLang());
TermMap langTermMap = tmf.createStringTermMap(lang);
tms.push(langTermMap);
} else if (func instanceof E_Str) {
TermMap strParam = tms.pop();
// create the coalesce function here
List<Expression> strExpressions = new ArrayList<Expression>();
strExpressions.add(
dth.cast(
DataTypeHelper.uncast(strParam.getLiteralValBinary()), dth.getStringCastType()));
strExpressions.add(
dth.cast(DataTypeHelper.uncast(strParam.getLiteralValBool()), dth.getStringCastType()));
strExpressions.add(
dth.cast(DataTypeHelper.uncast(strParam.getLiteralValDate()), dth.getStringCastType()));
strExpressions.add(
dth.cast(
DataTypeHelper.uncast(strParam.getLiteralValNumeric()), dth.getStringCastType()));
strExpressions.add(
dth.cast(
DataTypeHelper.uncast(strParam.getLiteralValString()), dth.getStringCastType()));
strExpressions.add(FilterUtil.concat(strParam.getExpressions().toArray(new Expression[0])));
Expression toString = FilterUtil.coalesce(strExpressions.toArray(new Expression[0]));
tms.push(tmf.createStringTermMap(toString));
} else if (func instanceof E_IsBlank) {
TermMap isBlank = tms.pop();
EqualsTo eq = new EqualsTo();
eq.setLeftExpression(isBlank.getTermType());
eq.setRightExpression(new StringValue("'" + ColumnHelper.COL_VAL_TYPE_BLANK + "'"));
tms.push(tmf.createBoolTermMap(eq));
} else if (func instanceof E_IsIRI) {
TermMap isIri = tms.pop();
EqualsTo eq = new EqualsTo();
eq.setLeftExpression(isIri.getTermType());
eq.setRightExpression(new StringValue("'" + ColumnHelper.COL_VAL_TYPE_RESOURCE + "'"));
tms.push(tmf.createBoolTermMap(eq));
} else if (func instanceof E_IsLiteral) {
TermMap isLiteral = tms.pop();
EqualsTo eq = new EqualsTo();
eq.setLeftExpression(isLiteral.getTermType());
eq.setRightExpression(new StringValue("'" + ColumnHelper.COL_VAL_TYPE_LITERAL + "'"));
tms.push(tmf.createBoolTermMap(eq));
} else {
throw new ImplementationException("Implement Conversion for " + func.toString());
}
}
public Expression asFilter(Expr expr, Map<String, TermMap> var2termMap) {
TermMap tm = asTermMap(expr, var2termMap);
return DataTypeHelper.uncast(tm.literalValBool);
}
public void setInputStream(InputStream in) {
try {
this.content = DataTypeHelper.getString(in); // 将ByteArrayInputStream转换成String
} catch (Exception ex) {
}
}