org.xnio.streams.LimitedOutputStream Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source
*
* Copyright 2010 Red Hat, Inc. and/or its affiliates, and individual
* contributors as indicated by the @author tags.
*
* Licensed 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.xnio.streams;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.OutputStream;
/**
* An output stream which truncates the writable output to the given length. Attempting to exceed the
* fixed limit will result in an exception.
*
* @author David M. Lloyd
*/
public final class LimitedOutputStream extends OutputStream {
private final OutputStream delegate;
private long remaining;
/**
* Construct a new instance.
*
* @param delegate the delegate output stream
* @param size the number of bytes to allow
*/
public LimitedOutputStream(final OutputStream delegate, final long size) {
this.delegate = delegate;
remaining = size;
}
/** {@inheritDoc} */
public void write(final int b) throws IOException {
final long remaining = this.remaining;
if (remaining < 1) {
throw notEnoughSpace();
}
delegate.write(b);
this.remaining = remaining - 1;
}
/** {@inheritDoc} */
public void write(final byte[] b, final int off, final int len) throws IOException {
final long remaining = this.remaining;
if (remaining < len) {
throw notEnoughSpace();
}
try {
delegate.write(b, off, len);
this.remaining = remaining - len;
} catch (InterruptedIOException e) {
this.remaining = remaining - (e.bytesTransferred & 0xFFFFFFFFL);
throw e;
}
}
/** {@inheritDoc} */
public void flush() throws IOException {
delegate.flush();
}
/** {@inheritDoc} */
public void close() throws IOException {
delegate.close();
}
private static IOException notEnoughSpace() {
return new IOException("Not enough space in output stream");
}
}