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CapInputStream.java
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CapInputStream.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Yegor Bugayenko
*
* 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 NON-INFRINGEMENT. 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 org.takes.rq;
import java.io.IOException;
import java.io.InputStream;
/**
* Input stream with a cap.
*
* <p>All implementations of this interface must be immutable and thread-safe.
*
* @since 0.16
*/
final class CapInputStream extends InputStream {
/**
* Original stream.
*/
private final InputStream origin;
/**
* More bytes to read.
*/
private long more;
/**
* Ctor.
* @param stream Original stream
* @param length Max length
*/
CapInputStream(final InputStream stream, final long length) {
super();
this.origin = stream;
this.more = length;
}
@Override
public int available() throws IOException {
return (int) Math.min(
(long) Integer.MAX_VALUE,
Math.max((long) this.origin.available(), this.more)
);
}
@Override
public int read() throws IOException {
final int data;
if (this.more <= 0L) {
data = -1;
} else {
data = this.origin.read();
--this.more;
}
return data;
}
@Override
public int read(final byte[] buf) throws IOException {
return this.read(buf, 0, buf.length);
}
@Override
public int read(final byte[] buf, final int off,
final int len) throws IOException {
final int readed;
if (this.more <= 0L) {
readed = -1;
} else {
readed = this.origin.read(buf, off, Math.min(len, (int) this.more));
this.more -= (long) readed;
}
return readed;
}
@Override
public long skip(final long num) throws IOException {
return this.origin.skip(num);
}
@Override
public void close() throws IOException {
this.origin.close();
}
}