| /* |
| * 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. |
| */ |
| package org.apache.commons.vfs2.util; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * An InputStream that provides end-of-stream monitoring. |
| * <p> |
| * This is the same as {@link MonitorInputStream} but without the buffering. |
| * </p> |
| * |
| * @since 2.5.0 |
| */ |
| public class RawMonitorInputStream extends FilterInputStream { |
| |
| private static final int EOF_CHAR = -1; |
| private final AtomicBoolean finished = new AtomicBoolean(false); |
| private final AtomicLong atomicCount = new AtomicLong(0); |
| |
| // @Override |
| // public synchronized void reset() throws IOException { |
| // if (!finished.get()) { |
| // super.reset(); |
| // } |
| // } |
| // |
| // @Override |
| // public synchronized long skip(long n) throws IOException { |
| // if (finished.get()) { |
| // return 0; |
| // } |
| // return super.skip(n); |
| // } |
| |
| /** |
| * Constructs a MonitorInputStream from the passed InputStream |
| * |
| * @param inputStream The input stream to wrap. |
| */ |
| public RawMonitorInputStream(final InputStream inputStream) { |
| super(inputStream); |
| } |
| |
| /** |
| * Returns 0 if the stream is at EOF, else the underlying inputStream will be queried. |
| * |
| * @return The number of bytes that are available. |
| * @throws IOException if an error occurs. |
| */ |
| @Override |
| public synchronized int available() throws IOException { |
| if (finished.get()) { |
| return 0; |
| } |
| |
| return super.available(); |
| } |
| |
| /** |
| * Reads a character. |
| * |
| * @return The character that was read as an integer. |
| * @throws IOException if an error occurs. |
| */ |
| @Override |
| public int read() throws IOException { // lgtm [java/non-sync-override] |
| if (finished.get()) { |
| return EOF_CHAR; |
| } |
| |
| final int ch = super.read(); |
| if (ch != EOF_CHAR) { |
| atomicCount.incrementAndGet(); |
| } |
| |
| return ch; |
| } |
| |
| /** |
| * Reads bytes from this input stream. |
| * |
| * @param buffer A byte array in which to place the characters read. |
| * @param offset The offset at which to start reading. |
| * @param length The maximum number of bytes to read. |
| * @return The number of bytes read. |
| * @throws IOException if an error occurs. |
| */ |
| @Override |
| public int read(final byte[] buffer, final int offset, final int length) throws IOException { // lgtm [java/non-sync-override] |
| if (finished.get()) { |
| return EOF_CHAR; |
| } |
| |
| final int nread = super.read(buffer, offset, length); |
| if (nread != EOF_CHAR) { |
| atomicCount.addAndGet(nread); |
| } |
| return nread; |
| } |
| |
| /** |
| * Closes this input stream and releases any system resources associated with the stream. |
| * |
| * @throws IOException if an error occurs. |
| */ |
| @Override |
| public void close() throws IOException { |
| final boolean closed = finished.getAndSet(true); |
| if (closed) { |
| return; |
| } |
| |
| // Close the stream |
| IOException exc = null; |
| try { |
| super.close(); |
| } catch (final IOException ioe) { |
| exc = ioe; |
| } |
| |
| // Notify that the stream has been closed |
| try { |
| onClose(); |
| } catch (final IOException ioe) { |
| exc = ioe; |
| } |
| |
| if (exc != null) { |
| throw exc; |
| } |
| } |
| |
| /** |
| * Called after the stream has been closed. This implementation does nothing. |
| * |
| * @throws IOException if an error occurs. |
| */ |
| protected void onClose() throws IOException { |
| // noop |
| } |
| |
| /** |
| * Gets the number of bytes read by this input stream. |
| * |
| * @return The number of bytes read by this input stream. |
| */ |
| public long getCount() { |
| return atomicCount.get(); |
| } |
| |
| @Override |
| public synchronized void mark(final int readlimit) { |
| // TODO Auto-generated method stub |
| super.mark(readlimit); |
| } |
| } |