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TRAPDatabase.java

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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 TRAPDatabase implements Database {

private final char SEP = ',';

private final char EOL = '\n';

private File _directory;

private Map<String, Writer> _writers;

public TRAPDatabase(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) {

}

public void add(String predicate, Column arg)

{

try

{

Writer w = getWriter(predicate);

writePredicate(predicate, w);

w.write("(");

w.write(arg.toString());

w.write(")");

w.write(EOL);

}

catch(IOException exc)

{

throw new RuntimeException(exc);

}

}

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

{

try

{

Writer w = getWriter(predicate);

writePredicate(predicate, w);

w.write("(");

w.write(arg1.toString());

w.write(SEP);

w.write(arg2.toString());

w.write(")");

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);

writePredicate(predicate, w);

w.write("(");

w.write(arg1.toString());

w.write(SEP);

w.write(arg2.toString());

w.write(SEP);

w.write(arg3.toString());

w.write(")");

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);

writePredicate(predicate, w);

w.write("(");

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(")");

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 + ".trap")));

_writers.put(predicate, result);

}

return result;

}

private String[] entities = new String[20];

int index = 0;

public Column addEntity(String predicate, String id) {

try

{

String escapedID = escape(id);

String key = createKey(escapedID);

String check = key + predicate;

for(int i = 0; i < 20; i++) {

if(check.equals(entities[(index - 1 - i + 20) % 20]))

return new Column(key);

}

entities[index] = check;

index = (index + 1) % 20;

Writer w = getWriter(predicate);

writePredicate(predicate, w);

w.write("(");

w.write(key);

w.write(SEP);

w.write(escapedID);

w.write(")");

w.write(EOL);

return new Column(key);

}

catch(IOException exc) {

throw new RuntimeException(exc);

}

}

public Column asColumn(String arg) {

return new Column(escape(arg));

}

public Column asIntColumn(String arg) {

return new Column(arg);

}

private String escape(String id) {

id = id.replaceAll("\"", "\"\"");

return "\"" + id + "\"";

}

private void writePredicate(String predicate, Writer w) throws IOException {

predicate = predicate.replaceAll("-", "");

w.write(Character.toLowerCase(predicate.charAt(0)));

w.write(predicate.substring(1));

}

public Column asEntity(String id) {

return new Column(createKey(escape(id)));

}

private String createKey(String escapedID) {

escapedID = escapedID.replace('{', '_');

escapedID = escapedID.replace('}', '_');

return "@" + escapedID;

}

}