content: /**
   * Copyright (C) 2024 AIDC-AI
   *
   * 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.langengine.core.chain.llmguard.input;
  
  
  import com.alibaba.langengine.core.chain.llmguard.ScannerResult;
  import com.alibaba.langengine.core.tokenizers.GPT35AboveTokenizer;
  import com.alibaba.langengine.core.tokenizers.Tokenizer;
  
  import java.util.Map;
  
  /**
   * @author Sinh Le
   */
  public class TokenLimit implements InputScanner {
      private int limit = 1000;
  
      Tokenizer tokenizer;
  
      public TokenLimit(int limit) {
          this.limit = limit;
          this.tokenizer = new GPT35AboveTokenizer();
      }
  
      public TokenLimit(int limit, Tokenizer tokenizer) {
          this.limit = limit;
          this.tokenizer = tokenizer;
      }
  
      @Override
      public ScannerResult scan(String text, Map<String, Object> extraAttributes) {
          if (text.trim().isEmpty()) {
              return new ScannerResult(text, true, 0.0);
          }
          int tokenCounter = tokenizer.getTokenCount(text);
          if (tokenCounter < limit) {
              return new ScannerResult(text, true, 0.0);
          }
          return new ScannerResult(text, false, 1.0);
      }
  
      @Override
      public String getName() {
          return "TokenLimit";
      }
  }
  