content: /*
   * Copyright 2002-2021 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.nacos.common.packagescan.resource;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * Copy from https://github.com/spring-projects/spring-framework.git, with less modifications
   * Simple interface for objects that are sources for an {@link InputStream}.
   *
   * <p>This is the base interface for Spring's more extensive {@link Resource} interface.
   *
   * <p>For single-use streams, {@link InputStreamResource} can be used for any
   * given {@code InputStream}. Spring's {@link ByteArrayResource} or any
   * file-based {@code Resource} implementation can be used as a concrete
   * instance, allowing one to read the underlying content stream multiple times.
   * This makes this interface useful as an abstract content source for mail
   * attachments, for example.
   *
   * @author Juergen Hoeller
   * @see InputStream
   * @see Resource
   * @see InputStreamResource
   * @see ByteArrayResource
   * @since 20.01.2004
   */
  public interface InputStreamSource {
  
      /**
       * Return an {@link InputStream} for the content of an underlying resource.
       *
       * <p>It is expected that each call creates a <i>fresh</i> stream.
       *
       * <p>This requirement is particularly important when you consider an API such
       * as JavaMail, which needs to be able to read the stream multiple times when
       * creating mail attachments. For such a use case, it is <i>required</i>
       * that each {@code getInputStream()} call returns a fresh stream.
       *
       * @return the input stream for the underlying resource (must not be {@code null})
       * @throws java.io.FileNotFoundException if the underlying resource does not exist
       * @throws IOException                   if the content stream could not be opened
       * @see Resource#isReadable()
       */
      InputStream getInputStream() throws IOException;
  
  }
  