/**
* Turns a path into an AST.
*
* @param path The path.
* @param factory The AST factory to use.
* @return An HQL AST representing the path.
*/
public static AST parsePath(String path, ASTFactory factory) {
String[] identifiers = StringHelper.split(".", path);
AST lhs = null;
for (int i = 0; i < identifiers.length; i++) {
String identifier = identifiers[i];
AST child = ASTUtil.create(factory, HqlSqlTokenTypes.IDENT, identifier);
if (i == 0) {
lhs = child;
} else {
lhs = ASTUtil.createBinarySubtree(factory, HqlSqlTokenTypes.DOT, ".", lhs, child);
}
}
if (LOG.isDebugEnabled()) {
LOG.debugf("parsePath() : %s -> %s", path, ASTUtil.getDebugString(lhs));
}
return lhs;
}
/** Generates the scalar column AST nodes for a given array of SQL columns */
public static void generateScalarColumns(HqlSqlWalkerNode node, String sqlColumns[], int i) {
if (sqlColumns.length == 1) {
generateSingleScalarColumn(node, i);
} else {
ASTFactory factory = node.getASTFactory();
AST n = node;
n.setText(sqlColumns[0]); // Use the DOT node to emit the first column name.
// Create the column names, folled by the column aliases.
for (int j = 0; j < sqlColumns.length; j++) {
if (j > 0) {
n = ASTUtil.createSibling(factory, SqlTokenTypes.SQL_TOKEN, sqlColumns[j], n);
}
n =
ASTUtil.createSibling(
factory, SqlTokenTypes.SELECT_COLUMNS, " as " + NameGenerator.scalarName(i, j), n);
}
}
}
static void generateSingleScalarColumn(HqlSqlWalkerNode node, int i) {
ASTFactory factory = node.getASTFactory();
ASTUtil.createSibling(
factory, SqlTokenTypes.SELECT_COLUMNS, " as " + NameGenerator.scalarName(i, 0), node);
}