/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jackrabbit.performance;
import java.io.InputStream;
import java.util.Random;
/**
* An input stream that returns a given number of dummy data. The returned
* data is designed to be non-compressible to prevent possible compression
* mechanisms from affecting performance measurements.
*/
class TestInputStream extends InputStream {
private final int n;
private int i;
/**
* Source of the random stream of bytes. No fixed seed is used to
* prevent a solution like the Jackrabbit data store from using just
* a single storage location for multiple streams.
*/
private final Random random = new Random();
public TestInputStream(int length) {
n = length;
i = 0;
}
@Override
public int read() {
if (i < n) {
i++;
byte[] b = new byte[1];
random.nextBytes(b);
return b[0];
} else {
return -1;
}
}
@Override
public int read(byte[] b, int off, int len) {
if (i < n) {
byte[] data = new byte[Math.min(len, n - i)];
random.nextBytes(data);
System.arraycopy(data, 0, b, off, data.length);
i += data.length;
return data.length;
} else {
return -1;
}
}
}