content: /*
   * Copyright 1999-2017 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.ast.expr;
  
  import com.alibaba.druid.sql.ast.SQLExprImpl;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  import com.alibaba.druid.util.HexBin;
  
  import java.nio.charset.StandardCharsets;
  
  public class SQLHexExpr extends SQLExprImpl implements SQLLiteralExpr, SQLValuableExpr {
      private final String hex;
  
      public SQLHexExpr(String hex) {
          this.hex = hex;
      }
  
      public String getHex() {
          return hex;
      }
  
      public void output(StringBuilder buf) {
          buf.append("0x");
          buf.append(this.hex);
  
          String charset = (String) getAttribute("USING");
          if (charset != null) {
              buf.append(" USING ");
              buf.append(charset);
          }
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
          visitor.endVisit(this);
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((hex == null) ? 0 : hex.hashCode());
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          SQLHexExpr other = (SQLHexExpr) obj;
          if (hex == null) {
              if (other.hex != null) {
                  return false;
              }
          } else if (!hex.equals(other.hex)) {
              return false;
          }
          return true;
      }
  
      public byte[] toBytes() {
          return HexBin.decode(this.hex);
      }
  
      public SQLHexExpr clone() {
          return new SQLHexExpr(hex);
      }
  
      public byte[] getValue() {
          return toBytes();
      }
  
      public SQLCharExpr toCharExpr() {
          byte[] bytes = toBytes();
          if (bytes == null) {
              return null;
          }
          String str = new String(bytes, StandardCharsets.UTF_8);
          return new SQLCharExpr(str);
      }
  }
  