blob: 0f084870de299dc03fd1b1b770600aadd3846081 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.io;
import java.io.IOException;
import java.io.InputStream;
import java.util.function.Supplier;
/**
* Input stream wrapping an input stream supplier, which doesn't have content yet at declaration time.
*
* @author jonmv
*/
public class LazyInputStream extends InputStream {
private Supplier<InputStream> source;
private InputStream delegate;
public LazyInputStream(Supplier<InputStream> source) {
this.source = source;
}
private InputStream in() {
if (delegate == null) {
delegate = source.get();
source = null;
}
return delegate;
}
@Override
public int read() throws IOException { return in().read(); }
@Override
public int read(byte[] b, int off, int len) throws IOException { return in().read(b, off, len); }
@Override
public long skip(long n) throws IOException { return in().skip(n); }
@Override
public int available() throws IOException { return in().available(); }
@Override
public void close() throws IOException { in().close(); }
@Override
public synchronized void mark(int readlimit) { in().mark(readlimit); }
@Override
public synchronized void reset() throws IOException { in().reset(); }
@Override
public boolean markSupported() { return in().markSupported(); }
}
|
