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- /*
- * Copyright (c) 2006-2015 DMDirc Developers
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
- package com.dmdirc.util.io;
-
- import java.io.FilterInputStream;
- import java.io.IOException;
- import java.io.InputStream;
-
- import javax.annotation.Nonnull;
-
- /**
- * Wrapped {@link InputStream} that provides updates to a {@link DownloadListener} as it reads a
- * stream.
- */
- public class ListenerInputStream extends FilterInputStream {
-
- private final DownloadListener listener;
- private final int length;
- private int count;
- private int mark;
-
- /**
- * Creates a new stream.
- *
- * @param in Stream to wrap
- * @param listener Listener to gives up dates to
- * @param length Length of the stream, if -1 the listener will be indeterminate
- */
- public ListenerInputStream(@Nonnull final InputStream in, final DownloadListener listener,
- final int length) {
- super(in);
- this.listener = listener;
- this.length = length;
- count = 0;
- mark = count;
- if (listener != null) {
- listener.setIndeterminate(length == -1);
- }
- }
-
- @Override
- public int read() throws IOException {
- final int read = super.read();
- return update(read);
- }
-
- @Override
- public int read(@Nonnull final byte[] b) throws IOException {
- final int read = super.read(b);
- return update(read);
- }
-
- @Override
- public int read(@Nonnull final byte[] b, final int off, final int len) throws IOException {
- final int read = super.read(b, off, len);
- return update(read);
- }
-
- @Override
- public long skip(final long n) throws IOException {
- final long read = super.skip(n);
- return update((int) read);
- }
-
- @Override
- public int available() throws IOException {
- return super.available();
- }
-
- @Override
- public void close() throws IOException {
- super.close();
- }
-
- @Override
- public synchronized void mark(final int readlimit) {
- mark = count;
- super.mark(readlimit);
- }
-
- @Override
- public synchronized void reset() throws IOException {
- update(mark - count);
- super.reset();
- }
-
- @Override
- public boolean markSupported() {
- return super.markSupported();
- }
-
- /**
- * Updates the listener and total read count.
- *
- * @param read Number of bytes further into stream.
- *
- * @return Returns the number of bytes read.
- */
- private int update(final int read) {
- if (read > 0) {
- count += read;
- if (listener != null && length != -1) {
- listener.downloadProgress(100 * (float) count / length);
- }
- }
- return read;
- }
- }
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