content: /*
   * Copyright 2024-2025 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.document;
  
  import org.springframework.ai.document.Document;
  import org.springframework.util.Assert;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.Charset;
  import java.nio.charset.StandardCharsets;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * @author HeYQ
   * @since 2024-12-08 21:13
   */
  public class TextDocumentParser implements DocumentParser {
  
  	private final Charset charset;
  
  	public TextDocumentParser() {
  		this(StandardCharsets.UTF_8);
  	}
  
  	public TextDocumentParser(Charset charset) {
  		Assert.notNull(charset, "charset");
  		this.charset = charset;
  	}
  
  	@Override
  	public List<Document> parse(InputStream inputStream) {
  		try {
  			// Read all text from the input stream and decode it using the specified
  			// character set.
  			String text = new String(inputStream.readAllBytes(), this.charset);
  			// If the text is completely empty, report an illegal argument exception.
  			if (text.isBlank()) {
  				throw new IllegalArgumentException("text must not be blank");
  			}
  			return Collections.singletonList(new Document(text));
  		}
  		catch (IOException e) {
  			// Convert any IO exception into a RuntimeException for propagation.
  			throw new RuntimeException(e);
  		}
  	}
  
  }
  