content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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.
   */
  /**
   * (created at 2011-1-21)
   */
  package com.alibaba.cobar.parser.ast.expression.primary.literal;
  
  import java.io.UnsupportedEncodingException;
  import java.util.Map;
  
  import com.alibaba.cobar.parser.util.ParseString;
  import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class LiteralHexadecimal extends Literal {
      private byte[] bytes;
      private final String introducer;
      private final String charset;
      private final char[] string;
      private final int offset;
      private final int size;
  
      /**
       * @param introducer e.g. "_latin1"
       * @param string e.g. "select x'89df'"
       * @param offset e.g. 9
       * @param size e.g. 4
       */
      public LiteralHexadecimal(String introducer, char[] string, int offset, int size, String charset) {
          super();
          if (string == null || offset + size > string.length)
              throw new IllegalArgumentException("hex text is invalid");
          if (charset == null)
              throw new IllegalArgumentException("charset is null");
          this.introducer = introducer;
          this.charset = charset;
          this.string = string;
          this.offset = offset;
          this.size = size;
      }
  
      public String getText() {
          return new String(string, offset, size);
      }
  
      public String getIntroducer() {
          return introducer;
      }
  
      public void appendTo(StringBuilder sb) {
          sb.append(string, offset, size);
      }
  
      @Override
      public Object evaluationInternal(Map<? extends Object, ? extends Object> parameters) {
          try {
              this.bytes = ParseString.hexString2Bytes(string, offset, size);
              return new String(bytes, introducer == null ? charset : introducer.substring(1));
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException("", e);
          }
      }
  
      @Override
      public void accept(SQLASTVisitor visitor) {
          visitor.visit(this);
      }
  
  }
  