FilesExpand file tree

 master

/

CSVDatabase.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

139 lines (124 loc) · 2.57 KB

 master

/

CSVDatabase.java

Top

File metadata and controls

• Code
• Blame

139 lines (124 loc) · 2.57 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.Writer;

import java.util.HashMap;

import java.util.Map;

public class CSVDatabase implements Database

{

private final char SEP = '\t';

private final char EOL = '\n';

private File _directory;

private Map<String, Writer> _writers;

public CSVDatabase(File directory)

{

super();

_directory = directory;

_writers = new HashMap<String, Writer>();

}

public void close() throws IOException

{

for(Writer w: _writers.values())

{

w.close();

}

}

public void register(String predicate) {

try

{

Writer w = getWriter(predicate);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

public void add(String predicate, Column arg)

{

try

{

Writer w = getWriter(predicate);

w.write(arg.toString());

w.write(EOL);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

public void add(String predicate, Column arg1, Column arg2)

{

try

{

Writer w = getWriter(predicate);

w.write(arg1.toString());

w.write(SEP);

w.write(arg2.toString());

w.write(EOL);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

public void add(String predicate, Column arg1, Column arg2, Column arg3)

{

try

{

Writer w = getWriter(predicate);

w.write(arg1.toString());

w.write(SEP);

w.write(arg2.toString());

w.write(SEP);

w.write(arg3.toString());

w.write(EOL);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

public void add(String predicate, Column arg1, Column arg2, Column arg3, Column arg4)

{

try

{

Writer w = getWriter(predicate);

w.write(arg1.toString());

w.write(SEP);

w.write(arg2.toString());

w.write(SEP);

w.write(arg3.toString());

w.write(SEP);

w.write(arg4.toString());

w.write(EOL);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

private Writer getWriter(String predicate) throws IOException

{

Writer result = _writers.get(predicate);

if(result == null)

{

result = new OutputStreamWriter(new FileOutputStream(new File(_directory, predicate + ".facts")));

_writers.put(predicate, result);

}

return result;

}

public Column addEntity(String string, String key) {

add(string, new Column(key));

return new Column(key);

}

public Column asColumn(String arg) {

return new Column(arg);

}

public Column asEntity(String arg) {

return new Column(arg);

}

public Column asIntColumn(String arg) {

return new Column(arg);

}

}