/*
* Copyright (c) 2012, grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.jowidgets.util.io;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* This class provides an buffered input stream that creates its buffer lazily and destroys the buffer when
* the stream get closed.
*
* This class is not threadsafe
*/
public class LazyBufferedInputStream extends InputStream {
private final InputStream original;
private final int bufferSize;
private BufferedInputStream bufferedInputStream;
private boolean closed;
public LazyBufferedInputStream(final InputStream original, final int bufferSize) {
this.original = original;
this.bufferSize = bufferSize;
}
@Override
public int read() throws IOException {
return getInputStream().read();
}
@Override
public int read(final byte[] b) throws IOException {
return getInputStream().read(b);
}
@Override
public int read(final byte[] b, final int off, final int len) throws IOException {
return getInputStream().read(b, off, len);
}
@Override
public long skip(final long n) throws IOException {
return getInputStream().skip(n);
}
@Override
public int available() throws IOException {
return getInputStream().available();
}
@Override
public void close() throws IOException {
closed = true;
if (bufferedInputStream != null) {
bufferedInputStream.close();
bufferedInputStream = null;
}
}
@Override
public synchronized void mark(final int readlimit) {
try {
getInputStream().mark(readlimit);
}
catch (final IOException e) {
throw new RuntimeException(e);
}
}
@Override
public synchronized void reset() throws IOException {
getInputStream().reset();
}
@Override
public boolean markSupported() {
return original.markSupported();
}
private InputStream getInputStream() throws IOException {
if (closed) {
throw new IOException("Stream was closed");
}
if (bufferedInputStream == null) {
bufferedInputStream = new BufferedInputStream(original, bufferSize);
}
return bufferedInputStream;
}
}