-
Notifications
You must be signed in to change notification settings - Fork 14
/
StatementHolder.java
127 lines (113 loc) · 4.17 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
/**
* Copyright (C) 2016 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 '\n':
case ' ':
if (inParam) {
lastParamEndIndex = i;
inParam = false;
final String param = statement.substring(paramStartIndex, i);
paramNames.add(param);
}
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);
}
}
}