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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.io;
import java.io.IOException;
/**
* This DataEntryReader delegates to one of two other DataEntryReader instances,
* depending on whether the data entry passes through a given data entry filter
* or not.
*
* @author Eric Lafortune
*/
public class FilteredDataEntryReader implements DataEntryReader
{
private final DataEntryFilter dataEntryFilter;
private final DataEntryReader acceptedDataEntryReader;
private final DataEntryReader rejectedDataEntryReader;
/**
* Creates a new FilteredDataEntryReader with only a reader for accepted
* data entries.
* @param dataEntryFilter the data entry filter.
* @param acceptedDataEntryReader the DataEntryReader to which the reading
* will be delegated if the filter accepts
* the data entry. May be <code>null</code>.
*/
public FilteredDataEntryReader(DataEntryFilter dataEntryFilter,
DataEntryReader acceptedDataEntryReader)
{
this(dataEntryFilter, acceptedDataEntryReader, null);
}
/**
* Creates a new FilteredDataEntryReader.
* @param dataEntryFilter the data entry filter.
* @param acceptedDataEntryReader the DataEntryReader to which the reading
* will be delegated if the filter accepts
* the data entry. May be <code>null</code>.
* @param rejectedDataEntryReader the DataEntryReader to which the reading
* will be delegated if the filter does not
* accept the data entry. May be
* <code>null</code>.
*/
public FilteredDataEntryReader(DataEntryFilter dataEntryFilter,
DataEntryReader acceptedDataEntryReader,
DataEntryReader rejectedDataEntryReader)
{
this.dataEntryFilter = dataEntryFilter;
this.acceptedDataEntryReader = acceptedDataEntryReader;
this.rejectedDataEntryReader = rejectedDataEntryReader;
}
// Implementations for DataEntryReader.
public void read(DataEntry dataEntry)
throws IOException
{
DataEntryReader dataEntryReader = dataEntryFilter.accepts(dataEntry) ?
acceptedDataEntryReader :
rejectedDataEntryReader;
if (dataEntryReader != null)
{
dataEntryReader.read(dataEntry);
}
}
}
|
