-
Notifications
You must be signed in to change notification settings - Fork 14
/
StatementHolder.java
137 lines (123 loc) · 4.43 KB
/
StatementHolder.java
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
/**
* Copyright (C) 2020 Czech Technical University in Prague
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.util;
import java.util.*;
/**
* Used for parsing and managing SPARQL statements.
*/
public class StatementHolder {
private Map<String, String> paramValues;
private List<String> paramNames;
private List<String> statementParts;
private final String statement;
public StatementHolder(String statement) {
Objects.requireNonNull(statement);
this.statement = statement.trim();
}
public void analyzeStatement() {
this.paramNames = new ArrayList<>();
this.statementParts = new ArrayList<>();
// In single-quoted string
boolean inSQString = false;
// In double-quoted string
boolean inDQString = false;
boolean inParam = false;
int lastParamEndIndex = 0;
int paramStartIndex = 0;
for (int i = 0; i < statement.length(); i++) {
final char c = statement.charAt(i);
switch (c) {
case '\'':
inSQString = !inSQString;
break;
case '"':
inDQString = !inDQString;
break;
case '?':
if (!inSQString && !inDQString) {
statementParts.add(statement.substring(lastParamEndIndex, i));
paramStartIndex = i + 1;
inParam = true;
}
break;
case '<':
case '>':
case ',':
case '\n':
case ')':
case ' ':
case '.':
case ';':
case '{':
case '}':
case '[':
case ']':
if (inParam) {
lastParamEndIndex = i;
final String param = statement.substring(paramStartIndex, i);
paramNames.add(param);
inParam = false;
}
break;
default:
break;
}
}
statementParts.add(statement.substring(lastParamEndIndex));
this.paramValues = new HashMap<>(paramNames.size());
assert statementParts.size() == paramNames.size() + 1;
}
public void setParameter(String parameterName, String value) {
ensureState();
if (!paramNames.contains(parameterName)) {
throw new IllegalArgumentException("Unknown binding name " + parameterName);
}
paramValues.put(parameterName, value);
}
private void ensureState() {
if (paramNames == null) {
throw new IllegalStateException("Statement has to be analyzed before working with parameters.");
}
}
public String assembleStatement() {
if (isNotParametrized()) {
return statement;
}
final StringBuilder sb = new StringBuilder(statement.length());
for (int i = 0; i < paramNames.size(); i++) {
sb.append(statementParts.get(i));
final String paramValue = paramValues.get(paramNames.get(i));
if (paramValue == null) {
sb.append("?").append(paramNames.get(i));
} else {
sb.append(paramValue);
}
}
sb.append(statementParts.get(paramNames.size()));
return sb.toString();
}
public String getStatement() {
return statement;
}
private boolean isNotParametrized() {
return paramNames == null || paramNames.isEmpty();
}
public void clearParameters() {
ensureState();
for (String param : paramValues.keySet()) {
paramValues.put(param, null);
}
}
}