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An JDBC datasource implementation.
/*
* Copyright 1999-2018 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.functions;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.parser.ParserException;
import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
import com.alibaba.druid.util.HexBin;
public class Hex implements Function {
public final static Hex instance = new Hex();
public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
if (x.getParameters().size() != 1) {
throw new ParserException("argument's != 1, " + x.getParameters().size());
}
SQLExpr param0 = x.getParameters().get(0);
param0.accept(visitor);
Object param0Value = param0.getAttributes().get(EVAL_VALUE);
if (param0Value == null) {
return SQLEvalVisitor.EVAL_ERROR;
}
if (param0Value instanceof String) {
byte[] bytes = ((String) param0Value).getBytes();
String result = HexBin.encode(bytes);
return result;
}
if (param0Value instanceof Number) {
long value = ((Number) param0Value).longValue();
String result = Long.toHexString(value).toUpperCase();
return result;
}
return SQLEvalVisitor.EVAL_ERROR;
}
}