/**
* this method adds a tuple
*
* @param t the tuple to add
*/
public void addTuple(Tuple t) {
// add the tuple to the list of tuples
tuples.add(t);
int i = 0;
String s;
// iterate over columns to determine maximum columnwidth
for (Value v : t) {
s = v.toString();
if (s == null) {
s = Constants.PRINT_NULL;
} else {
// update column width if value not null
columnWidth[i] = Math.max(columnWidth[i], s.length());
}
// if stringbuffer creation is toggled on
if (createSB) {
stringBuffer.append(
StringUtils.format(s, columnNames.get(i).length(), v.isNumeric()) + " ");
}
i++;
}
if (createSB) stringBuffer.append("\r\n");
}
/**
* extracts the column headers for display
*
* @param rsmd the resultsetmetadata object of the resultset
*/
public void extractColumnHeaders(ResultSetMetaData rsmd) {
try {
// number of columns
int columnCount = rsmd.getColumnCount();
// create collection which stores the column headers as Strings
List<String> columnHeaders = new ArrayList<String>(columnCount);
// number of printed characters
int[] columnPrintWidth = new int[columnCount];
// numeric column type?
boolean[] columnIsNumeric = new boolean[columnCount];
// parse in column headers from metadata
for (int column = 0; column < columnCount; column++) {
// retrieve information about the column
String columnName = rsmd.getColumnName(column + 1);
int columnDisplaySize = rsmd.getColumnDisplaySize(column + 1);
if (columnDisplaySize <= 0) {
columnDisplaySize = Constants.DEFAULT_PRINT_WIDTH;
}
if (columnDisplaySize > Constants.MAX_PRINT_WIDTH) {
columnDisplaySize = Constants.MAX_PRINT_WIDTH;
}
columnIsNumeric[column] = rsmd.isSigned(column + 1); // hack for isNumeric
columnPrintWidth[column] = Math.max(columnDisplaySize, columnName.length());
// add column name to collection
columnHeaders.add(StringUtils.format(columnName, columnPrintWidth[column] + 1, false));
}
// save columnheaders
setColumnNames(columnHeaders);
} catch (SQLException e) {
System.out.println(
"SQLException occured during extraction of column headers from metadata for ResultSetModel.");
e.printStackTrace();
}
}
/**
* this method returns a StringBuffer containing the contents of this ResultSetModel
*
* @param newLine the LineDelimiter for a newline character
* @return a StringBuffer of the contents
*/
public StringBuffer getStringBufferFromRSM(String newLine) {
int columnCount = columnNames.size(); // number of columns
if (!createSB) {
stringBuffer = new StringBuffer();
// print data
Iterator<Tuple> iter = tuples.iterator();
Tuple tuple;
String valueFreeOfSpecialChars;
while (iter.hasNext()) { // for each row
tuple = iter.next();
for (int column = 0; column < columnCount; column++) { // for each column
// print value
Value value = tuple.getValue(column);
if (!value.isNull()) {
valueFreeOfSpecialChars = StringUtils.replaceDelChars(value.toString());
stringBuffer.append(
StringUtils.format(
valueFreeOfSpecialChars, columnWidth[column], value.isNumeric()));
} else {
stringBuffer.append(
StringUtils.format(Constants.PRINT_NULL, columnWidth[column], value.isNumeric()));
}
if (column < columnCount) {
stringBuffer.append(' ');
}
}
stringBuffer.append(newLine);
}
stringBuffer.append(newLine);
// toggle flag to get into other path, when next request for this model
createSB = true;
}
StringBuffer sb = new StringBuffer(); // create new StringBuffer
// print column headers
for (int column = 0; column < columnCount; column++) {
// retrieve information about the column
String columnName = columnNames.get(column);
// print column name
sb.append(StringUtils.format(columnName, columnWidth[column], false)).append(" ");
}
sb.append(newLine);
// print separator line
for (int column = 0; column < columnCount; column++) {
for (int i = 0; i < columnWidth[column]; i++) {
sb.append('-');
}
sb.append(' ');
}
sb.append(newLine);
// use already created stringbuffer to print out results
sb.append(stringBuffer);
// finally print tuple count
sb.append(newLine + tuples.size() + " row(s) selected.");
return sb;
}