| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.impl.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.hc.core5.http.StreamClosedException; |
| import org.apache.hc.core5.http.io.SessionInputBuffer; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Input stream that reads data without any transformation. The end of the |
| * content entity is demarcated by closing the underlying connection |
| * (EOF condition). Entities transferred using this input stream can be of |
| * unlimited length. |
| * <p> |
| * Note that this class NEVER closes the underlying stream, even when close |
| * gets called. Instead, it will read until the end of the stream (until |
| * {@code -1} is returned). |
| * |
| * @since 4.0 |
| */ |
| public class IdentityInputStream extends InputStream { |
| |
| private final SessionInputBuffer buffer; |
| private final InputStream inputStream; |
| |
| private boolean closed = false; |
| |
| /** |
| * Default constructor. |
| * |
| * @param buffer Session input buffer |
| * @param inputStream Input stream |
| */ |
| public IdentityInputStream(final SessionInputBuffer buffer, final InputStream inputStream) { |
| super(); |
| this.buffer = Args.notNull(buffer, "Session input buffer"); |
| this.inputStream = Args.notNull(inputStream, "Input stream"); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| if (this.closed) { |
| return 0; |
| } |
| final int n = this.buffer.length(); |
| return n > 0 ? n : this.inputStream.available(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| this.closed = true; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| if (this.closed) { |
| throw new StreamClosedException(); |
| } |
| return this.buffer.read(this.inputStream); |
| } |
| |
| @Override |
| public int read(final byte[] b, final int off, final int len) throws IOException { |
| if (this.closed) { |
| throw new StreamClosedException(); |
| } |
| return this.buffer.read(b, off, len, this.inputStream); |
| } |
| |
| } |