| /* |
| * ==================================================================== |
| * 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.nio; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.ReadableByteChannel; |
| |
| import org.apache.hc.core5.http.impl.BasicHttpTransportMetrics; |
| import org.apache.hc.core5.http.nio.FileContentDecoder; |
| import org.apache.hc.core5.http.nio.SessionInputBuffer; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Content decoder that reads data without any transformation. The end of the |
| * content entity is delineated by closing the underlying connection |
| * (EOF condition). Entities transferred using this input stream can be of |
| * unlimited length. |
| * <p> |
| * This decoder is optimized to transfer data directly from the underlying |
| * I/O session's channel to a {@link FileChannel}, whenever |
| * possible avoiding intermediate buffering in the session buffer. |
| * |
| * @since 4.0 |
| */ |
| public class IdentityDecoder extends AbstractContentDecoder implements FileContentDecoder { |
| |
| public IdentityDecoder( |
| final ReadableByteChannel channel, |
| final SessionInputBuffer buffer, |
| final BasicHttpTransportMetrics metrics) { |
| super(channel, buffer, metrics); |
| } |
| |
| @Override |
| public int read(final ByteBuffer dst) throws IOException { |
| Args.notNull(dst, "Byte buffer"); |
| if (isCompleted()) { |
| return -1; |
| } |
| |
| final int bytesRead; |
| if (this.buffer.hasData()) { |
| bytesRead = this.buffer.read(dst); |
| } else { |
| bytesRead = readFromChannel(dst); |
| } |
| if (bytesRead == -1) { |
| setCompleted(); |
| } |
| return bytesRead; |
| } |
| |
| @Override |
| public long transfer( |
| final FileChannel dst, |
| final long position, |
| final long count) throws IOException { |
| |
| if (dst == null) { |
| return 0; |
| } |
| if (isCompleted()) { |
| return 0; |
| } |
| |
| long bytesRead; |
| if (this.buffer.hasData()) { |
| final int maxLen = this.buffer.length(); |
| dst.position(position); |
| bytesRead = this.buffer.read(dst, count < maxLen ? (int)count : maxLen); |
| } else { |
| if (this.channel.isOpen()) { |
| if (position > dst.size()) { |
| throw new IOException("Position past end of file [" + position + |
| " > " + dst.size() + "]"); |
| } |
| bytesRead = dst.transferFrom(this.channel, position, count); |
| if (count > 0 && bytesRead == 0) { |
| bytesRead = this.buffer.fill(this.channel); |
| } |
| } else { |
| bytesRead = -1; |
| } |
| if (bytesRead > 0) { |
| this.metrics.incrementBytesTransferred(bytesRead); |
| } |
| } |
| if (bytesRead == -1) { |
| setCompleted(); |
| } |
| return bytesRead; |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append("[identity; completed: "); |
| sb.append(this.completed); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| } |