content: /*
   * Copyright 2025 the original author or authors.
   *
   * 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
   *
   *      https://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.cloud.ai.studio.core.rag.reader;
  
  import org.springframework.ai.document.Document;
  import org.springframework.ai.document.DocumentReader;
  import org.springframework.core.io.FileSystemResource;
  import org.springframework.core.io.Resource;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  
  /**
   * A document reader implementation for text files. Reads and processes text content from
   * files or resources.
   *
   * @since 1.0.0.3
   */
  public class TextDocumentReader implements DocumentReader {
  
  	/** The resource containing the text content to be read */
  	private final Resource resource;
  
  	/**
  	 * Creates a new TextDocumentReader for the specified file.
  	 * @param file file
  	 */
  	public TextDocumentReader(File file) {
  		resource = new FileSystemResource(file);
  	}
  
  	public TextDocumentReader(Resource resource) {
  		this.resource = resource;
  	}
  
  	@Override
  	public List<Document> get() {
  		try {
  			String text = new String(resource.getInputStream().readAllBytes(), StandardCharsets.UTF_8);
  			if (text.isBlank()) {
  				return List.of();
  			}
  
  			return List.of(new Document(text));
  		}
  		catch (IOException e) {
  			throw new RuntimeException(e);
  		}
  	}
  
  }
  