/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.druid.sql.visitor;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_ERROR;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_EXPR;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE_NULL;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import com.alibaba.druid.DruidRuntimeException;
import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.expr.SQLBetweenExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
import com.alibaba.druid.sql.ast.expr.SQLHexExpr;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
import com.alibaba.druid.sql.ast.expr.SQLUnaryExpr;
import com.alibaba.druid.sql.ast.expr.SQLUnaryOperator;
import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
import com.alibaba.druid.sql.ast.statement.SQLSelect;
import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.dialect.db2.visitor.DB2EvalVisitor;
import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlBinaryExpr;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlEvalVisitorImpl;
import com.alibaba.druid.sql.dialect.oracle.visitor.OracleEvalVisitor;
import com.alibaba.druid.sql.dialect.postgresql.visitor.PGEvalVisitor;
import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerEvalVisitor;
import com.alibaba.druid.sql.visitor.functions.Ascii;
import com.alibaba.druid.sql.visitor.functions.Bin;
import com.alibaba.druid.sql.visitor.functions.BitLength;
import com.alibaba.druid.sql.visitor.functions.Char;
import com.alibaba.druid.sql.visitor.functions.Concat;
import com.alibaba.druid.sql.visitor.functions.Elt;
import com.alibaba.druid.sql.visitor.functions.Function;
import com.alibaba.druid.sql.visitor.functions.Greatest;
import com.alibaba.druid.sql.visitor.functions.Hex;
import com.alibaba.druid.sql.visitor.functions.If;
import com.alibaba.druid.sql.visitor.functions.Insert;
import com.alibaba.druid.sql.visitor.functions.Instr;
import com.alibaba.druid.sql.visitor.functions.Isnull;
import com.alibaba.druid.sql.visitor.functions.Lcase;
import com.alibaba.druid.sql.visitor.functions.Least;
import com.alibaba.druid.sql.visitor.functions.Left;
import com.alibaba.druid.sql.visitor.functions.Length;
import com.alibaba.druid.sql.visitor.functions.Locate;
import com.alibaba.druid.sql.visitor.functions.Lpad;
import com.alibaba.druid.sql.visitor.functions.Ltrim;
import com.alibaba.druid.sql.visitor.functions.Now;
import com.alibaba.druid.sql.visitor.functions.OneParamFunctions;
import com.alibaba.druid.sql.visitor.functions.Reverse;
import com.alibaba.druid.sql.visitor.functions.Right;
import com.alibaba.druid.sql.visitor.functions.Substring;
import com.alibaba.druid.sql.visitor.functions.Trim;
import com.alibaba.druid.sql.visitor.functions.Ucase;
import com.alibaba.druid.sql.visitor.functions.Unhex;
import com.alibaba.druid.util.HexBin;
import com.alibaba.druid.util.JdbcUtils;
import com.alibaba.druid.util.Utils;
import com.alibaba.druid.wall.spi.WallVisitorUtils;
import com.alibaba.druid.wall.spi.WallVisitorUtils.WallConditionContext;
import com.alibaba.druid.wall.spi.WallVisitorUtils.WallSelectQueryContext;
public class SQLEvalVisitorUtils {
private static Map<String, Function> functions = new HashMap<String, Function>();
static {
registerBaseFunctions();
}
public static Object evalExpr(String dbType, String expr, Object... parameters) {
SQLExpr sqlExpr = SQLUtils.toSQLExpr(expr, dbType);
return eval(dbType, sqlExpr, parameters);
}
public static Object evalExpr(String dbType, String expr, List<Object> parameters) {
SQLExpr sqlExpr = SQLUtils.toSQLExpr(expr);
return eval(dbType, sqlExpr, parameters);
}
public static Object eval(String dbType, SQLObject sqlObject, Object... parameters) {
Object value = eval(dbType, sqlObject, Arrays.asList(parameters));
if (value == EVAL_VALUE_NULL) {
value = null;
}
return value;
}
public static Object getValue(SQLObject sqlObject) {
if (sqlObject instanceof SQLNumericLiteralExpr) {
return ((SQLNumericLiteralExpr) sqlObject).getNumber();
}
return sqlObject.getAttributes().get(EVAL_VALUE);
}
public static Object eval(String dbType, SQLObject sqlObject, List<Object> parameters) {
return eval(dbType, sqlObject, parameters, true);
}
public static Object eval(String dbType, SQLObject sqlObject, List<Object> parameters, boolean throwError) {
SQLEvalVisitor visitor = createEvalVisitor(dbType);
visitor.setParameters(parameters);
sqlObject.accept(visitor);
Object value = getValue(sqlObject);
if (value == null) {
if (throwError && !sqlObject.getAttributes().containsKey(EVAL_VALUE)) {
throw new DruidRuntimeException("eval error : " + SQLUtils.toSQLString(sqlObject, dbType));
}
}
return value;
}
public static SQLEvalVisitor createEvalVisitor(String dbType) {
if (JdbcUtils.MYSQL.equals(dbType)) {
return new MySqlEvalVisitorImpl();
}
if (JdbcUtils.MARIADB.equals(dbType)) {
return new MySqlEvalVisitorImpl();
}
if (JdbcUtils.H2.equals(dbType)) {
return new MySqlEvalVisitorImpl();
}
if (JdbcUtils.ORACLE.equals(dbType) || JdbcUtils.ALI_ORACLE.equals(dbType)) {
return new OracleEvalVisitor();
}
if (JdbcUtils.POSTGRESQL.equals(dbType)) {
return new PGEvalVisitor();
}
if (JdbcUtils.SQL_SERVER.equals(dbType) || JdbcUtils.JTDS.equals(dbType)) {
return new SQLServerEvalVisitor();
}
if (JdbcUtils.DB2.equals(dbType)) {
return new DB2EvalVisitor();
}
return new SQLEvalVisitorImpl();
}
static void registerBaseFunctions() {
functions.put("now", Now.instance);
functions.put("concat", Concat.instance);
functions.put("concat_ws", Concat.instance);
functions.put("ascii", Ascii.instance);
functions.put("bin", Bin.instance);
functions.put("bit_length", BitLength.instance);
functions.put("insert", Insert.instance);
functions.put("instr", Instr.instance);
functions.put("char", Char.instance);
functions.put("elt", Elt.instance);
functions.put("left", Left.instance);
functions.put("locate", Locate.instance);
functions.put("lpad", Lpad.instance);
functions.put("ltrim", Ltrim.instance);
functions.put("mid", Substring.instance);
functions.put("substr", Substring.instance);
functions.put("substring", Substring.instance);
functions.put("right", Right.instance);
functions.put("reverse", Reverse.instance);
functions.put("len", Length.instance);
functions.put("length", Length.instance);
functions.put("char_length", Length.instance);
functions.put("character_length", Length.instance);
functions.put("trim", Trim.instance);
functions.put("ucase", Ucase.instance);
functions.put("upper", Ucase.instance);
functions.put("ucase", Lcase.instance);
functions.put("lower", Lcase.instance);
functions.put("hex", Hex.instance);
functions.put("unhex", Unhex.instance);
functions.put("greatest", Greatest.instance);
functions.put("least", Least.instance);
functions.put("isnull", Isnull.instance);
functions.put("if", If.instance);
functions.put("md5", OneParamFunctions.instance);
functions.put("bit_count", OneParamFunctions.instance);
functions.put("soundex", OneParamFunctions.instance);
functions.put("space", OneParamFunctions.instance);
}
public static boolean visit(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
String methodName = x.getMethodName().toLowerCase();
Function function = visitor.getFunction(methodName);
if (function == null) {
function = functions.get(methodName);
}
if (function != null) {
Object result = function.eval(visitor, x);
if (result != SQLEvalVisitor.EVAL_ERROR) {
x.getAttributes().put(EVAL_VALUE, result);
}
return false;
}
if ("mod".equals(methodName)) {
if (x.getParameters().size() != 2) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
SQLExpr param1 = x.getParameters().get(1);
param0.accept(visitor);
param1.accept(visitor);
Object param0Value = param0.getAttributes().get(EVAL_VALUE);
Object param1Value = param1.getAttributes().get(EVAL_VALUE);
if (param0Value == null || param1Value == null) {
return false;
}
int intValue0 = castToInteger(param0Value);
int intValue1 = castToInteger(param1Value);
int result = intValue0 % intValue1;
x.putAttribute(EVAL_VALUE, result);
} else if ("abs".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
Object result;
if (paramValue instanceof Integer) {
result = Math.abs(((Integer) paramValue).intValue());
} else if (paramValue instanceof Long) {
result = Math.abs(((Long) paramValue).longValue());
} else {
result = castToDecimal(paramValue).abs();
}
x.putAttribute(EVAL_VALUE, result);
} else if ("acos".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.acos(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("asin".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.asin(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("atan".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.atan(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("atan2".equals(methodName)) {
if (x.getParameters().size() != 2) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
SQLExpr param1 = x.getParameters().get(1);
param0.accept(visitor);
param1.accept(visitor);
Object param0Value = param0.getAttributes().get(EVAL_VALUE);
Object param1Value = param1.getAttributes().get(EVAL_VALUE);
if (param0Value == null || param1Value == null) {
return false;
}
double doubleValue0 = castToDouble(param0Value);
double doubleValue1 = castToDouble(param1Value);
double result = Math.atan2(doubleValue0, doubleValue1);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("ceil".equals(methodName) || "ceiling".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
int result = (int) Math.ceil(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("cos".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.cos(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("sin".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.sin(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("log".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.log(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("log10".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.log10(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("tan".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.tan(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("sqrt".equals(methodName)) {
if (x.getParameters().size() != 1) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object paramValue = param0.getAttributes().get(EVAL_VALUE);
if (paramValue == null) {
return false;
}
double doubleValue = castToDouble(paramValue);
double result = Math.sqrt(doubleValue);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("power".equals(methodName) || "pow".equals(methodName)) {
if (x.getParameters().size() != 2) {
return false;
}
SQLExpr param0 = x.getParameters().get(0);
SQLExpr param1 = x.getParameters().get(1);
param0.accept(visitor);
param1.accept(visitor);
Object param0Value = param0.getAttributes().get(EVAL_VALUE);
Object param1Value = param1.getAttributes().get(EVAL_VALUE);
if (param0Value == null || param1Value == null) {
return false;
}
double doubleValue0 = castToDouble(param0Value);
double doubleValue1 = castToDouble(param1Value);
double result = Math.pow(doubleValue0, doubleValue1);
if (Double.isNaN(result)) {
x.putAttribute(EVAL_VALUE, null);
} else {
x.putAttribute(EVAL_VALUE, result);
}
} else if ("pi".equals(methodName)) {
x.putAttribute(EVAL_VALUE, Math.PI);
} else if ("rand".equals(methodName)) {
x.putAttribute(EVAL_VALUE, Math.random());
} else if ("chr".equals(methodName) && x.getParameters().size() == 1) {
SQLExpr first = x.getParameters().get(0);
Object firstResult = getValue(first);
if (firstResult instanceof Number) {
int intValue = ((Number) firstResult).intValue();
char ch = (char) intValue;
x.putAttribute(EVAL_VALUE, Character.toString(ch));
}
} else if ("current_user".equals(methodName)) {
x.putAttribute(EVAL_VALUE, "CURRENT_USER");
}
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLCharExpr x) {
x.putAttribute(EVAL_VALUE, x.getText());
return true;
}
public static boolean visit(SQLEvalVisitor visitor, SQLHexExpr x) {
String hex = x.getHex();
byte[] bytes = HexBin.decode(hex);
if (bytes == null) {
x.putAttribute(EVAL_VALUE, EVAL_ERROR);
} else {
String val = new String(bytes);
x.putAttribute(EVAL_VALUE, val);
}
return true;
}
public static boolean visit(SQLEvalVisitor visitor, MySqlBinaryExpr x) {
String text = x.getValue();
long[] words = new long[text.length() / 64 + 1];
for (int i = 0; i < text.length(); ++i) {
char ch = text.charAt(i);
if (ch == '1') {
int wordIndex = i >> 6;
words[wordIndex] |= (1L << i);
}
}
Object val;
if (words.length == 1) {
val = words[0];
} else {
byte[] bytes = new byte[words.length * 8];
for (int i = 0; i < words.length; ++i) {
Utils.putLong(bytes, i * 8, words[i]);
}
val = new BigInteger(bytes);
}
x.putAttribute(EVAL_VALUE, val);
return false;
}
public static SQLExpr unwrap(SQLExpr expr) {
if (expr == null) {
return null;
}
if (expr instanceof SQLQueryExpr) {
SQLSelect select = ((SQLQueryExpr) expr).getSubQuery();
if (select == null) {
return null;
}
if (select.getQuery() instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) select.getQuery();
if (queryBlock.getFrom() == null) {
if (queryBlock.getSelectList().size() == 1) {
return queryBlock.getSelectList().get(0).getExpr();
}
}
}
}
return expr;
}
public static boolean visit(SQLEvalVisitor visitor, SQLBetweenExpr x) {
SQLExpr testExpr = unwrap(x.getTestExpr());
testExpr.accept(visitor);
if (!testExpr.getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object value = testExpr.getAttribute(EVAL_VALUE);
SQLExpr beginExpr = unwrap(x.getBeginExpr());
beginExpr.accept(visitor);
if (!beginExpr.getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object begin = beginExpr.getAttribute(EVAL_VALUE);
if (lt(value, begin)) {
x.getAttributes().put(EVAL_VALUE, x.isNot() ? true : false);
return false;
}
SQLExpr endExpr = unwrap(x.getEndExpr());
endExpr.accept(visitor);
if (!endExpr.getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object end = endExpr.getAttribute(EVAL_VALUE);
if (gt(value, end)) {
x.getAttributes().put(EVAL_VALUE, x.isNot() ? true : false);
return false;
}
x.getAttributes().put(EVAL_VALUE, x.isNot() ? false : true);
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLNullExpr x) {
x.getAttributes().put(EVAL_VALUE, EVAL_VALUE_NULL);
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLCaseExpr x) {
Object value;
if (x.getValueExpr() != null) {
x.getValueExpr().accept(visitor);
if (!x.getValueExpr().getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
value = x.getValueExpr().getAttribute(EVAL_VALUE);
} else {
value = null;
}
for (SQLCaseExpr.Item item : x.getItems()) {
item.getConditionExpr().accept(visitor);
if (!item.getConditionExpr().getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object conditionValue = item.getConditionExpr().getAttribute(EVAL_VALUE);
if (eq(value, conditionValue)) {
item.getValueExpr().accept(visitor);
if (item.getValueExpr().getAttributes().containsKey(EVAL_VALUE)) {
x.getAttributes().put(EVAL_VALUE, item.getValueExpr().getAttribute(EVAL_VALUE));
}
return false;
}
}
if (x.getElseExpr() != null) {
x.getElseExpr().accept(visitor);
if (x.getElseExpr().getAttributes().containsKey(EVAL_VALUE)) {
x.getAttributes().put(EVAL_VALUE, x.getElseExpr().getAttribute(EVAL_VALUE));
}
}
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLInListExpr x) {
SQLExpr valueExpr = x.getExpr();
valueExpr.accept(visitor);
if (!valueExpr.getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object value = valueExpr.getAttribute(EVAL_VALUE);
for (SQLExpr item : x.getTargetList()) {
item.accept(visitor);
if (!item.getAttributes().containsKey(EVAL_VALUE)) {
return false;
}
Object itemValue = item.getAttribute(EVAL_VALUE);
if (eq(value, itemValue)) {
x.getAttributes().put(EVAL_VALUE, x.isNot() ? false : true);
return false;
}
}
x.getAttributes().put(EVAL_VALUE, x.isNot() ? true : false);
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLQueryExpr x) {
if (WallVisitorUtils.isSimpleCountTableSource(null, ((SQLQueryExpr) x).getSubQuery())) {
x.putAttribute(EVAL_VALUE, 1);
return false;
}
if (x.getSubQuery().getQuery() instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) x.getSubQuery().getQuery();
boolean nullFrom = false;
if (queryBlock.getFrom() == null) {
nullFrom = true;
} else if (queryBlock.getFrom() instanceof SQLExprTableSource) {
SQLExpr expr = ((SQLExprTableSource) queryBlock.getFrom()).getExpr();
if (expr instanceof SQLIdentifierExpr) {
if ("dual".equalsIgnoreCase(((SQLIdentifierExpr) expr).getName())) {
nullFrom = true;
}
}
}
if (nullFrom) {
List<Object> row = new ArrayList<Object>(queryBlock.getSelectList().size());
for (int i = 0; i < queryBlock.getSelectList().size(); ++i) {
SQLSelectItem item = queryBlock.getSelectList().get(i);
item.getExpr().accept(visitor);
Object cell = item.getExpr().getAttribute(EVAL_VALUE);
row.add(cell);
}
List<List<Object>> rows = new ArrayList<List<Object>>(1);
rows.add(row);
Object result = rows;
queryBlock.putAttribute(EVAL_VALUE, result);
x.getSubQuery().putAttribute(EVAL_VALUE, result);
x.putAttribute(EVAL_VALUE, result);
return false;
}
}
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLUnaryExpr x) {
final WallConditionContext wallConditionContext = WallVisitorUtils.getWallConditionContext();
if (x.getOperator() == SQLUnaryOperator.Compl && wallConditionContext != null) {
wallConditionContext.setBitwise(true);
}
x.getExpr().accept(visitor);
Object val = x.getExpr().getAttribute(EVAL_VALUE);
if (val == EVAL_ERROR) {
x.putAttribute(EVAL_VALUE, EVAL_ERROR);
return false;
}
switch (x.getOperator()) {
case BINARY:
case RAW:
x.putAttribute(EVAL_VALUE, val);
break;
case NOT:
case Not: {
Boolean booleanVal = castToBoolean(val);
if (booleanVal != null) {
x.putAttribute(EVAL_VALUE, !booleanVal);
}
break;
}
case Plus:
x.putAttribute(EVAL_VALUE, val);
break;
case Negative:
x.putAttribute(EVAL_VALUE, multi(val, -1));
break;
case Compl:
x.putAttribute(EVAL_VALUE, ~castToInteger(val));
break;
default:
break;
}
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLBinaryOpExpr x) {
SQLExpr left = unwrap(x.getLeft());
SQLExpr right = unwrap(x.getRight());
// final WallConditionContext old = wallConditionContextLocal.get();
left.accept(visitor);
right.accept(visitor);
final WallConditionContext wallConditionContext = WallVisitorUtils.getWallConditionContext();
if (x.getOperator() == SQLBinaryOperator.BooleanOr) {
if (wallConditionContext != null) {
if (left.getAttribute(EVAL_VALUE) == Boolean.TRUE || right.getAttribute(EVAL_VALUE) == Boolean.TRUE) {
wallConditionContext.setPartAlwayTrue(true);
}
}
} else if (x.getOperator() == SQLBinaryOperator.BooleanXor) {
if (wallConditionContext != null) {
wallConditionContext.setXor(true);
}
} else if (x.getOperator() == SQLBinaryOperator.BitwiseAnd //
|| x.getOperator() == SQLBinaryOperator.BitwiseNot //
|| x.getOperator() == SQLBinaryOperator.BitwiseOr //
|| x.getOperator() == SQLBinaryOperator.BitwiseXor) {
if (wallConditionContext != null) {
wallConditionContext.setBitwise(true);
}
}
Object leftValue = left.getAttribute(EVAL_VALUE);
Object rightValue = right.getAttributes().get(EVAL_VALUE);
if (x.getOperator() == SQLBinaryOperator.Like) {
if (isAlwayTrueLikePattern(x.getRight())) {
final WallSelectQueryContext wallSelectQueryContext = WallVisitorUtils.getWallSelectQueryContext();
if (wallSelectQueryContext != null) {
wallSelectQueryContext.setTrueLike(Boolean.TRUE);
}
x.putAttribute(EVAL_VALUE, Boolean.TRUE);
return false;
}
}
if (x.getOperator() == SQLBinaryOperator.NotLike) {
if (isAlwayTrueLikePattern(x)) {
x.putAttribute(EVAL_VALUE, Boolean.FALSE);
return false;
}
}
boolean leftHasValue = left.getAttributes().containsKey(EVAL_VALUE);
boolean rightHasValue = right.getAttributes().containsKey(EVAL_VALUE);
if ((!leftHasValue) && !rightHasValue) {
SQLExpr leftEvalExpr = (SQLExpr) left.getAttribute(EVAL_EXPR);
SQLExpr rightEvalExpr = (SQLExpr) right.getAttribute(EVAL_EXPR);
if (leftEvalExpr != null && leftEvalExpr.equals(rightEvalExpr)) {
switch (x.getOperator()) {
case Like:
case Equality:
case GreaterThanOrEqual:
case LessThanOrEqual:
case NotLessThan:
case NotGreaterThan:
x.putAttribute(EVAL_VALUE, Boolean.TRUE);
return false;
case NotEqual:
case NotLike:
case GreaterThan:
case LessThan:
x.putAttribute(EVAL_VALUE, Boolean.FALSE);
return false;
default:
break;
}
}
}
if (!leftHasValue) {
return false;
}
if (!rightHasValue) {
return false;
}
if (wallConditionContext != null) {
wallConditionContext.setConstArithmetic(true);
}
leftValue = processValue(leftValue);
rightValue = processValue(rightValue);
if (leftValue == null || rightValue == null) {
return false;
}
Object value = null;
switch (x.getOperator()) {
case Add:
value = add(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case Subtract:
value = sub(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case Multiply:
value = multi(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case Divide:
value = div(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case RightShift:
value = rightShift(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case BitwiseAnd:
value = bitAnd(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case BitwiseOr:
value = bitOr(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case GreaterThan:
value = gt(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case GreaterThanOrEqual:
value = gteq(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case LessThan:
value = lt(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case LessThanOrEqual:
value = lteq(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case Is:
if (rightValue == EVAL_VALUE_NULL) {
if (leftValue != null) {
value = (leftValue == EVAL_VALUE_NULL);
x.putAttribute(EVAL_VALUE, value);
break;
}
}
break;
case Equality:
value = eq(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case NotEqual:
value = !eq(leftValue, rightValue);
x.putAttribute(EVAL_VALUE, value);
break;
case IsNot:
if (leftValue == EVAL_VALUE_NULL) {
x.putAttribute(EVAL_VALUE, false);
} else if (leftValue != null) {
x.putAttribute(EVAL_VALUE, true);
}
break;
case RegExp:
case RLike: {
String pattern = castToString(rightValue);
String input = castToString(left.getAttributes().get(EVAL_VALUE));
boolean matchResult = Pattern.matches(pattern, input);
x.putAttribute(EVAL_VALUE, matchResult);
break;
}
case NotRegExp:
case NotRLike: {
String pattern = castToString(rightValue);
String input = castToString(left.getAttributes().get(EVAL_VALUE));
boolean matchResult = !Pattern.matches(pattern, input);
x.putAttribute(EVAL_VALUE, matchResult);
break;
}
case Like: {
String pattern = castToString(rightValue);
String input = castToString(left.getAttributes().get(EVAL_VALUE));
boolean matchResult = like(input, pattern);
x.putAttribute(EVAL_VALUE, matchResult);
break;
}
case NotLike: {
String pattern = castToString(rightValue);
String input = castToString(left.getAttributes().get(EVAL_VALUE));
boolean matchResult = !like(input, pattern);
x.putAttribute(EVAL_VALUE, matchResult);
break;
}
case Concat: {
String result = leftValue.toString() + rightValue.toString();
x.putAttribute(EVAL_VALUE, result);
break;
}
default:
break;
}
return false;
}
@SuppressWarnings("rawtypes")
private static Object processValue(Object value) {
if (value instanceof List) {
List list = (List) value;
if (list.size() == 1) {
return processValue(list.get(0));
}
}
return value;
}
private static boolean isAlwayTrueLikePattern(SQLExpr x) {
if (x instanceof SQLCharExpr) {
String text = ((SQLCharExpr) x).getText();
if (text.length() >= 0) {
for (char ch : text.toCharArray()) {
if (ch != '%') {
return false;
}
}
return true;
}
}
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLNumericLiteralExpr x) {
x.getAttributes().put(EVAL_VALUE, x.getNumber());
return false;
}
public static boolean visit(SQLEvalVisitor visitor, SQLVariantRefExpr x) {
if (!"?".equals(x.getName())) {
return false;
}
Map<String, Object> attributes = x.getAttributes();
int varIndex = x.getIndex();
if (varIndex != -1 && visitor.getParameters().size() > varIndex) {
boolean containsValue = attributes.containsKey(EVAL_VALUE);
if (!containsValue) {
Object value = visitor.getParameters().get(varIndex);
if (value == null) {
value = EVAL_VALUE_NULL;
}
attributes.put(EVAL_VALUE, value);
}
}
return false;
}
public static Boolean castToBoolean(Object val) {
if (val == null) {
return null;
}
if (val instanceof Boolean) {
return (Boolean) val;
}
if (val instanceof Number) {
return ((Number) val).intValue() > 0;
}
if (val instanceof String) {
if ("1".equals(val) || "true".equalsIgnoreCase((String) val)) {
return true;
}
return false;
}
throw new IllegalArgumentException(val.getClass() + " not supported.");
}
public static String castToString(Object val) {
Object value = val;
if (value == null) {
return null;
}
return value.toString();
}
public static Byte castToByte(Object val) {
if (val == null) {
return null;
}
if (val instanceof Byte) {
return (Byte) val;
}
if (val instanceof String) {
return Byte.parseByte((String) val);
}
return ((Number) val).byteValue();
}
public static Short castToShort(Object val) {
if (val == null || val == EVAL_VALUE_NULL) {
return null;
}
if (val instanceof Short) {
return (Short) val;
}
if (val instanceof String) {
return Short.parseShort((String) val);
}
return ((Number) val).shortValue();
}
@SuppressWarnings("rawtypes")
public static Integer castToInteger(Object val) {
if (val == null) {
return null;
}
if (val instanceof Integer) {
return (Integer) val;
}
if (val instanceof String) {
return Integer.parseInt((String) val);
}
if (val instanceof List) {
List list = (List) val;
if (list.size() == 1) {
return castToInteger(list.get(0));
}
}
if (val instanceof Boolean) {
if (((Boolean) val).booleanValue()) {
return 1;
} else {
return 0;
}
}
if (val instanceof Number) {
return ((Number) val).intValue();
}
throw new DruidRuntimeException("cast error");
}
@SuppressWarnings("rawtypes")
public static Long castToLong(Object val) {
if (val == null) {
return null;
}
if (val instanceof Long) {
return (Long) val;
}
if (val instanceof String) {
return Long.parseLong((String) val);
}
if (val instanceof List) {
List list = (List) val;
if (list.size() == 1) {
return castToLong(list.get(0));
}
}
return ((Number) val).longValue();
}
public static Float castToFloat(Object val) {
if (val == null || val == EVAL_VALUE_NULL) {
return null;
}
if (val instanceof Float) {
return (Float) val;
}
return ((Number) val).floatValue();
}
public static Double castToDouble(Object val) {
if (val == null || val == EVAL_VALUE_NULL) {
return null;
}
if (val instanceof Double) {
return (Double) val;
}
return ((Number) val).doubleValue();
}
public static BigInteger castToBigInteger(Object val) {
if (val == null) {
return null;
}
if (val instanceof BigInteger) {
return (BigInteger) val;
}
if (val instanceof String) {
return new BigInteger((String) val);
}
return BigInteger.valueOf(((Number) val).longValue());
}
public static Date castToDate(Object val) {
if (val == null) {
return null;
}
if (val instanceof Date) {
return (Date) val;
}
if (val instanceof Number) {
return new Date(((Number) val).longValue());
}
if (val instanceof String) {
return castToDate((String) val);
}
throw new DruidRuntimeException("can cast to date");
}
public static Date castToDate(String text) {
if (text == null || text.length() == 0) {
return null;
}
String format;
if (text.length() == "yyyy-MM-dd".length()) {
format = "yyyy-MM-dd";
} else {
format = "yyyy-MM-dd HH:mm:ss";
}
try {
return new SimpleDateFormat(format).parse(text);
} catch (ParseException e) {
throw new DruidRuntimeException("format : " + format + ", value : " + text, e);
}
}
public static BigDecimal castToDecimal(Object val) {
if (val == null) {
return null;
}
if (val instanceof BigDecimal) {
return (BigDecimal) val;
}
if (val instanceof String) {
return new BigDecimal((String) val);
}
if (val instanceof Float) {
return new BigDecimal((Float) val);
}
if (val instanceof Double) {
return new BigDecimal((Double) val);
}
return BigDecimal.valueOf(((Number) val).longValue());
}
public static Object rightShift(Object a, Object b) {
if (a == null || b == null) {
return null;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a).longValue() >> castToLong(b).longValue();
}
return castToInteger(a).intValue() >> castToInteger(b).intValue();
}
public static Object bitAnd(Object a, Object b) {
if (a == null || b == null) {
return null;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a).longValue() & castToLong(b).longValue();
}
return castToInteger(a).intValue() & castToInteger(b).intValue();
}
public static Object bitOr(Object a, Object b) {
if (a == null || b == null) {
return null;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a).longValue() | castToLong(b).longValue();
}
return castToInteger(a).intValue() | castToInteger(b).intValue();
}
public static Object div(Object a, Object b) {
if (a == null || b == null) {
return null;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
BigDecimal decimalA = castToDecimal(a);
BigDecimal decimalB = castToDecimal(b);
if (decimalB.scale() < decimalA.scale()) {
decimalB = decimalB.setScale(decimalA.scale());
}
try {
return decimalA.divide(decimalB);
} catch (ArithmeticException ex) {
return decimalA.divide(decimalB, BigDecimal.ROUND_HALF_UP);
}
}
if (a instanceof Double || b instanceof Double) {
Double doubleA = castToDouble(a);
Double doubleB = castToDouble(b);
if (doubleA == null || doubleB == null) {
return null;
}
return doubleA / doubleB;
}
if (a instanceof Float || b instanceof Float) {
Float floatA = castToFloat(a);
Float floatB = castToFloat(b);
if (floatA == null || floatB == null) {
return null;
}
return floatA / floatB;
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).divide(castToBigInteger(b));
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) / castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
Integer intA = castToInteger(a);
Integer intB = castToInteger(b);
if (intB == 0) {
if (intA > 0) {
return Double.POSITIVE_INFINITY;
} else if (intA < 0) {
return Double.NEGATIVE_INFINITY;
} else {
return Double.NaN;
}
}
return intA / intB;
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a) / castToShort(b);
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) / castToByte(b);
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static boolean gt(Object a, Object b) {
if (a == null || a == EVAL_VALUE_NULL) {
return false;
}
if (b == null || a == EVAL_VALUE_NULL) {
return true;
}
if (a instanceof String || b instanceof String) {
return castToString(a).compareTo(castToString(b)) > 0;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).compareTo(castToDecimal(b)) > 0;
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).compareTo(castToBigInteger(b)) > 0;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) > castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
return castToInteger(a) > castToInteger(b);
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a) > castToShort(b);
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) > castToByte(b);
}
if (a instanceof Date || b instanceof Date) {
Date d1 = castToDate(a);
Date d2 = castToDate(b);
if (d1 == d2) {
return false;
}
if (d1 == null) {
return false;
}
if (d2 == null) {
return true;
}
return d1.compareTo(d2) > 0;
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static boolean gteq(Object a, Object b) {
if (eq(a, b)) {
return true;
}
return gt(a, b);
}
public static boolean lt(Object a, Object b) {
if (a == null) {
return true;
}
if (b == null) {
return false;
}
if (a instanceof String || b instanceof String) {
return (castToString(a)).compareTo(castToString(b)) < 0;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).compareTo(castToDecimal(b)) < 0;
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).compareTo(castToBigInteger(b)) < 0;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) < castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
Integer intA = castToInteger(a);
Integer intB = castToInteger(b);
return intA < intB;
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a) < castToShort(b);
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) < castToByte(b);
}
if (a instanceof Date || b instanceof Date) {
Date d1 = castToDate(a);
Date d2 = castToDate(b);
if (d1 == d2) {
return false;
}
if (d1 == null) {
return true;
}
if (d2 == null) {
return false;
}
return d1.compareTo(d2) < 0;
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static boolean lteq(Object a, Object b) {
if (eq(a, b)) {
return true;
}
return lt(a, b);
}
public static boolean eq(Object a, Object b) {
if (a == b) {
return true;
}
if (a == null || b == null) {
return false;
}
if (a.equals(b)) {
return true;
}
if (a instanceof String || b instanceof String) {
return castToString(a).equals(castToString(b));
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).compareTo(castToDecimal(b)) == 0;
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).compareTo(castToBigInteger(b)) == 0;
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a).equals(castToLong(b));
}
if (a instanceof Integer || b instanceof Integer) {
return castToInteger(a).equals(castToInteger(b));
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a).equals(castToShort(b));
}
if (a instanceof Boolean || b instanceof Boolean) {
return castToBoolean(a).equals(castToBoolean(b));
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a).equals(castToByte(b));
}
if (a instanceof Date || b instanceof Date) {
Date d1 = castToDate(a);
Date d2 = castToDate(b);
if (d1 == d2) {
return true;
}
if (d1 == null || d2 == null) {
return false;
}
return d1.equals(d2);
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static Object add(Object a, Object b) {
if (a == null) {
return b;
}
if (b == null) {
return a;
}
if (a == EVAL_VALUE_NULL || b == EVAL_VALUE_NULL) {
return EVAL_VALUE_NULL;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).add(castToDecimal(b));
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).add(castToBigInteger(b));
}
if (a instanceof Double || b instanceof Double) {
return castToDouble(a) + castToDouble(b);
}
if (a instanceof Float || b instanceof Float) {
return castToFloat(a) + castToFloat(b);
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) + castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
return castToInteger(a) + castToInteger(b);
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a) + castToShort(b);
}
if (a instanceof Boolean || b instanceof Boolean) {
int aI = 0, bI = 0;
if (castToBoolean(a)) aI = 1;
if (castToBoolean(b)) bI = 1;
return aI + bI;
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) + castToByte(b);
}
if (a instanceof String || b instanceof String) {
return castToString(a) + castToString(b);
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static Object sub(Object a, Object b) {
if (a == null) {
return null;
}
if (b == null) {
return a;
}
if (a instanceof Date || b instanceof Date) {
return SQLEvalVisitor.EVAL_ERROR;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).subtract(castToDecimal(b));
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).subtract(castToBigInteger(b));
}
if (a instanceof Double || b instanceof Double) {
return castToDouble(a) - castToDouble(b);
}
if (a instanceof Float || b instanceof Float) {
return castToFloat(a) - castToFloat(b);
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) - castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
return castToInteger(a) - castToInteger(b);
}
if (a instanceof Short || b instanceof Short) {
return castToShort(a) - castToShort(b);
}
if (a instanceof Boolean || b instanceof Boolean) {
int aI = 0, bI = 0;
if (castToBoolean(a)) aI = 1;
if (castToBoolean(b)) bI = 1;
return aI - bI;
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) - castToByte(b);
}
if (a instanceof String && b instanceof String) {
return castToLong(a) - castToLong(b);
}
// return SQLEvalVisitor.EVAL_ERROR;
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static Object multi(Object a, Object b) {
if (a == null || b == null) {
return null;
}
if (a instanceof BigDecimal || b instanceof BigDecimal) {
return castToDecimal(a).multiply(castToDecimal(b));
}
if (a instanceof BigInteger || b instanceof BigInteger) {
return castToBigInteger(a).multiply(castToBigInteger(b));
}
if (a instanceof Long || b instanceof Long) {
return castToLong(a) * castToLong(b);
}
if (a instanceof Integer || b instanceof Integer) {
return castToInteger(a) * castToInteger(b);
}
if (a instanceof Short || b instanceof Short) {
Short shortA = castToShort(a);
Short shortB = castToShort(b);
if (shortA == null || shortB == null) {
return null;
}
return shortA * shortB;
}
if (a instanceof Byte || b instanceof Byte) {
return castToByte(a) * castToByte(b);
}
throw new IllegalArgumentException(a.getClass() + " and " + b.getClass() + " not supported.");
}
public static boolean like(String input, String pattern) {
if (pattern == null) {
throw new IllegalArgumentException("pattern is null");
}
StringBuilder regexprBuilder = new StringBuilder(pattern.length() + 4);
final int STAT_NOTSET = 0;
final int STAT_RANGE = 1;
final int STAT_LITERAL = 2;
int stat = STAT_NOTSET;
int blockStart = -1;
for (int i = 0; i < pattern.length(); ++i) {
char ch = pattern.charAt(i);
if (stat == STAT_LITERAL //
&& (ch == '%' || ch == '_' || ch == '[')) {
String block = pattern.substring(blockStart, i);
regexprBuilder.append("\\Q");
regexprBuilder.append(block);
regexprBuilder.append("\\E");
blockStart = -1;
stat = STAT_NOTSET;
}
if (ch == '%') {
regexprBuilder.append(".*");
} else if (ch == '_') {
regexprBuilder.append('.');
} else if (ch == '[') {
if (stat == STAT_RANGE) {
throw new IllegalArgumentException("illegal pattern : " + pattern);
}
stat = STAT_RANGE;
blockStart = i;
} else if (ch == ']') {
if (stat != STAT_RANGE) {
throw new IllegalArgumentException("illegal pattern : " + pattern);
}
String block = pattern.substring(blockStart, i + 1);
regexprBuilder.append(block);
blockStart = -1;
} else {
if (stat == STAT_NOTSET) {
stat = STAT_LITERAL;
blockStart = i;
}
if (stat == STAT_LITERAL && i == pattern.length() - 1) {
String block = pattern.substring(blockStart, i + 1);
regexprBuilder.append("\\Q");
regexprBuilder.append(block);
regexprBuilder.append("\\E");
}
}
}
if ("%".equals(pattern) || "%%".equals(pattern)) {
return true;
}
String regexpr = regexprBuilder.toString();
return Pattern.matches(regexpr, input);
}
public static boolean visit(SQLEvalVisitor visitor, SQLIdentifierExpr x) {
x.putAttribute(EVAL_EXPR, x);
return false;
}
}