blob: ec362d0ba07586eee0e3d4249e4340d7a98fd23c (
plain)
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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright 2002-2004 Apache Software Foundation
*
* 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 org.apache.tools.ant.filters;
import java.io.IOException;
import java.io.Reader;
import java.util.Vector;
import org.apache.tools.ant.types.Parameter;
import org.apache.tools.ant.types.RegularExpression;
import org.apache.tools.ant.util.regexp.Regexp;
/**
* Filter which includes only those lines that contain the user-specified
* regular expression matching strings.
*
* Example:
* <pre><linecontainsregexp>
* <regexp pattern="foo*">
* </linecontainsregexp></pre>
*
* Or:
*
* <pre><filterreader classname="org.apache.tools.ant.filters.LineContainsRegExp">
* <param type="regexp" value="foo*"/>
* </filterreader></pre>
*
* This will fetch all those lines that contain the pattern <code>foo</code>
*
* @author Magesh Umasankar
*/
public final class LineContainsRegExp
extends BaseParamFilterReader
implements ChainableReader {
/** Parameter name for the regular expression to filter on. */
private static final String REGEXP_KEY = "regexp";
/** Vector that holds the expressions that input lines must contain. */
private Vector regexps = new Vector();
/**
* Remaining line to be read from this filter, or <code>null</code> if
* the next call to <code>read()</code> should read the original stream
* to find the next matching line.
*/
private String line = null;
/**
* Constructor for "dummy" instances.
*
* @see BaseFilterReader#BaseFilterReader()
*/
public LineContainsRegExp() {
super();
}
/**
* Creates a new filtered reader.
*
* @param in A Reader object providing the underlying stream.
* Must not be <code>null</code>.
*/
public LineContainsRegExp(final Reader in) {
super(in);
}
/**
* Returns the next character in the filtered stream, only including
* lines from the original stream which match all of the specified
* regular expressions.
*
* @return the next character in the resulting stream, or -1
* if the end of the resulting stream has been reached
*
* @exception IOException if the underlying stream throws an IOException
* during reading
*/
public final int read() throws IOException {
if (!getInitialized()) {
initialize();
setInitialized(true);
}
int ch = -1;
if (line != null) {
ch = line.charAt(0);
if (line.length() == 1) {
line = null;
} else {
line = line.substring(1);
}
} else {
line = readLine();
final int regexpsSize = regexps.size();
while (line != null) {
for (int i = 0; i < regexpsSize; i++) {
RegularExpression regexp = (RegularExpression)
regexps.elementAt(i);
Regexp re = regexp.getRegexp(getProject());
boolean matches = re.matches(line);
if (!matches) {
line = null;
break;
}
}
if (line == null) {
// line didn't match
line = readLine();
} else {
break;
}
}
if (line != null) {
return read();
}
}
return ch;
}
/**
* Adds a <code>regexp</code> element.
*
* @param regExp The <code>regexp</code> element to add.
* Must not be <code>null</code>.
*/
public final void addConfiguredRegexp(final RegularExpression regExp) {
this.regexps.addElement(regExp);
}
/**
* Sets the vector of regular expressions which must be contained within
* a line read from the original stream in order for it to match this
* filter.
*
* @param regexps A vector of regular expressions which must be contained
* within a line in order for it to match in this filter. Must not be
* <code>null</code>.
*/
private void setRegexps(final Vector regexps) {
this.regexps = regexps;
}
/**
* Returns the vector of regular expressions which must be contained within
* a line read from the original stream in order for it to match this
* filter.
*
* @return the vector of regular expressions which must be contained within
* a line read from the original stream in order for it to match this
* filter. The returned object is "live" - in other words, changes made to
* the returned object are mirrored in the filter.
*/
private final Vector getRegexps() {
return regexps;
}
/**
* Creates a new LineContainsRegExp using the passed in
* Reader for instantiation.
*
* @param rdr A Reader object providing the underlying stream.
* Must not be <code>null</code>.
*
* @return a new filter based on this configuration, but filtering
* the specified reader
*/
public final Reader chain(final Reader rdr) {
LineContainsRegExp newFilter = new LineContainsRegExp(rdr);
newFilter.setRegexps(getRegexps());
newFilter.setInitialized(true);
return newFilter;
}
/**
* Parses parameters to add user defined regular expressions.
*/
private final void initialize() {
Parameter[] params = getParameters();
if (params != null) {
for (int i = 0; i < params.length; i++) {
if (REGEXP_KEY.equals(params[i].getType())) {
String pattern = params[i].getValue();
RegularExpression regexp = new RegularExpression();
regexp.setPattern(pattern);
regexps.addElement(regexp);
}
}
}
}
}
|
