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Copy pathCountingInputStream.java
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92 lines (81 loc) · 2.25 KB
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/**
* Copyright 2012-2020 The Feign Authors
*
* 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 feign.micrometer;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import feign.Util;
/**
* Copy from guava CountingInputStream
*
* An {@link InputStream} that counts the number of bytes read.
*
* @author Chris Nokleberg
* @since 1.0
*/
public final class CountingInputStream extends FilterInputStream {
private long count;
private long mark = -1;
/**
* Wraps another input stream, counting the number of bytes read.
*
* @param in the input stream to be wrapped
*/
public CountingInputStream(InputStream in) {
super(Util.checkNotNull(in, "InputStream must not be null"));
}
/** Returns the number of bytes read. */
public long getCount() {
return count;
}
@Override
public int read() throws IOException {
final int result = in.read();
if (result != -1) {
count++;
}
return result;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
final int result = in.read(b, off, len);
if (result != -1) {
count += result;
}
return result;
}
@Override
public long skip(long n) throws IOException {
final long result = in.skip(n);
count += result;
return result;
}
@Override
public synchronized void mark(int readlimit) {
in.mark(readlimit);
mark = count;
// it's okay to mark even if mark isn't supported, as reset won't work
}
@Override
public synchronized void reset() throws IOException {
if (!in.markSupported()) {
throw new IOException("Mark not supported");
}
if (mark == -1) {
throw new IOException("Mark not set");
}
in.reset();
count = mark;
}
}