protected static void rewriteFilterItem(StringBuilder sb, FilterItem filterItem)
throws UnsupportedOperationException {
if (filterItem.isCompoundFilter()) {
FilterItem[] childrend = filterItem.getChildItems();
boolean firstChild = true;
sb.append('(');
for (FilterItem child : childrend) {
if (firstChild) {
firstChild = false;
} else {
sb.append(' ');
sb.append(filterItem.getLogicalOperator().toString());
sb.append(' ');
}
rewriteFilterItem(sb, child);
}
sb.append(')');
return;
}
final SelectItem selectItem = filterItem.getSelectItem();
validateSoqlSupportedSelectItem(selectItem);
final Column column = selectItem.getColumn();
sb.append(column.getName());
sb.append(' ');
final OperatorType operator = filterItem.getOperator();
if (OperatorType.IN.equals(operator)) {
throw new UnsupportedOperationException("IN operator not supported: " + filterItem);
}
sb.append(operator.toSql());
sb.append(' ');
final Object operand = filterItem.getOperand();
if (operand == null) {
sb.append("null");
} else if (operand instanceof String) {
sb.append('\'');
String str = operand.toString();
str = str.replaceAll("\'", "\\\\'");
str = str.replaceAll("\"", "\\\\\"");
str = str.replaceAll("\r", "\\\\r");
str = str.replaceAll("\n", "\\\\n");
str = str.replaceAll("\t", "\\\\t");
sb.append(str);
sb.append('\'');
} else if (operand instanceof Number) {
sb.append(operand);
} else if (operand instanceof Date) {
final SimpleDateFormat dateFormat;
ColumnType expectedColumnType = selectItem.getExpectedColumnType();
if (expectedColumnType == ColumnType.DATE) {
// note: we don't apply the timezone for DATE fields, since they
// don't contain time-of-day information.
dateFormat = new SimpleDateFormat(SOQL_DATE_FORMAT_OUT);
} else if (expectedColumnType == ColumnType.TIME) {
dateFormat = new SimpleDateFormat(SOQL_TIME_FORMAT_OUT, Locale.ENGLISH);
dateFormat.setTimeZone(SOQL_TIMEZONE);
} else {
dateFormat = new SimpleDateFormat(SOQL_DATE_TIME_FORMAT_OUT, Locale.ENGLISH);
dateFormat.setTimeZone(SOQL_TIMEZONE);
}
String str = dateFormat.format((Date) operand);
logger.debug("Date '{}' formatted as: {}", operand, str);
sb.append(str);
} else if (operand instanceof Column) {
sb.append(((Column) operand).getName());
} else if (operand instanceof SelectItem) {
SelectItem operandSelectItem = (SelectItem) operand;
validateSoqlSupportedSelectItem(operandSelectItem);
sb.append(operandSelectItem.getColumn().getName());
} else {
throw new UnsupportedOperationException("Unsupported operand: " + operand);
}
}
@Override
public DataSet executeQuery(Query query) {
final List<FromItem> fromItems = query.getFromClause().getItems();
if (fromItems.size() != 1) {
// not a simple SELECT ... FROM [table] ... query, we need to use
// query post processing.
return super.executeQuery(query);
}
final Table table = fromItems.get(0).getTable();
if (table == null) {
return super.executeQuery(query);
}
if (!query.getGroupByClause().isEmpty()) {
return super.executeQuery(query);
}
if (!query.getHavingClause().isEmpty()) {
return super.executeQuery(query);
}
final List<SelectItem> selectItems = query.getSelectClause().getItems();
final StringBuilder sb = new StringBuilder();
try {
sb.append("SELECT ");
int i = 0;
final Column[] columns = new Column[selectItems.size()];
for (SelectItem selectItem : selectItems) {
validateSoqlSupportedSelectItem(selectItem);
columns[i] = selectItem.getColumn();
if (i != 0) {
sb.append(", ");
}
sb.append(columns[i].getName());
i++;
}
sb.append(" FROM ");
sb.append(table.getName());
boolean firstWhere = true;
for (FilterItem filterItem : query.getWhereClause().getItems()) {
if (firstWhere) {
sb.append(" WHERE ");
firstWhere = false;
} else {
sb.append(" AND ");
}
rewriteFilterItem(sb, filterItem);
}
i = 0;
final List<OrderByItem> items = query.getOrderByClause().getItems();
for (OrderByItem orderByItem : items) {
if (i == 0) {
sb.append(" ORDER BY ");
} else {
sb.append(", ");
}
final SelectItem selectItem = orderByItem.getSelectItem();
validateSoqlSupportedSelectItem(selectItem);
final Column column = selectItem.getColumn();
sb.append(column.getName());
sb.append(' ');
sb.append(orderByItem.getDirection());
i++;
}
final Integer firstRow = query.getFirstRow();
final Integer maxRows = query.getMaxRows();
if (maxRows != null && maxRows > 0) {
if (firstRow != null) {
// add first row / offset to avoid missing some records.
sb.append(" LIMIT " + (maxRows + firstRow - 1));
} else {
sb.append(" LIMIT " + maxRows);
}
}
final QueryResult result = executeSoqlQuery(sb.toString());
DataSet dataSet = new SalesforceDataSet(columns, result, _connection);
if (firstRow != null) {
// OFFSET is still only a developer preview feature of SFDC. See
// http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_soql_select_offset.htm
dataSet = new FirstRowDataSet(dataSet, firstRow.intValue());
}
return dataSet;
} catch (UnsupportedOperationException e) {
logger.debug(
"Failed to rewrite query to SOQL, falling back to regular query post-processing", e);
return super.executeQuery(query);
}
}