/* 
    * 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 org.esigate.parser;
  
  import java.io.IOException;
  
  public class Adapter implements Appendable {
      private final Element adaptable;
      private char content;
      private final CharSequence oneCharSequence = new CharSequence() {
          @Override
          public CharSequence subSequence(int start, int end) {
              if (start == 0 && end == 0) {
                  return this;
              } else {
                  throw new ArrayIndexOutOfBoundsException();
              }
          }
  
          @Override
          public int length() {
              return 1;
          }
  
          @Override
          public char charAt(int index) {
              return content;
          }
      };
  
      @Override
      public Appendable append(CharSequence csq, int start, int end) throws IOException {
          adaptable.characters(csq, start, end);
          return this;
      }
  
      @Override
      public Appendable append(char c) throws IOException {
          content = c;
          return append(oneCharSequence, 0, 1);
      }
  
      @Override
      public Appendable append(CharSequence csq) throws IOException {
          return append(csq, 0, csq.length());
      }
  
      public Adapter(Element adaptable) {
          this.adaptable = adaptable;
      }
  }