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InputStreamByteIterator.java
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Tue, Jul 15, 18:51

InputStreamByteIterator.java
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/**
* Copyright (c) 2010-2016 Yahoo! Inc., 2017 YCSB contributors All rights reserved.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb;
import java.io.IOException;
import java.io.InputStream;
/**
* A ByteIterator that iterates through an inputstream of bytes.
*/
public class InputStreamByteIterator extends ByteIterator {
private long len;
private InputStream ins;
private long off;
private final boolean resetable;
public InputStreamByteIterator(InputStream ins, long len) {
this.len = len;
this.ins = ins;
off = 0;
resetable = ins.markSupported();
if (resetable) {
ins.mark((int) len);
}
}
@Override
public boolean hasNext() {
return off < len;
}
@Override
public byte nextByte() {
int ret;
try {
ret = ins.read();
} catch (Exception e) {
throw new IllegalStateException(e);
}
if (ret == -1) {
throw new IllegalStateException("Past EOF!");
}
off++;
return (byte) ret;
}
@Override
public long bytesLeft() {
return len - off;
}
@Override
public void reset() {
if (resetable) {
try {
ins.reset();
ins.mark((int) len);
} catch (IOException e) {
throw new IllegalStateException("Failed to reset the input stream", e);
}
}
throw new UnsupportedOperationException();
}
}

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