org.hibernate.cfg.reveng.dialect.ResultSetIterator Maven / Gradle / Ivy
package org.hibernate.cfg.reveng.dialect;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import org.hibernate.exception.spi.SQLExceptionConverter;
/**
* Iterator over a resultset; intended usage only for metadata reading.
*/
public abstract class ResultSetIterator implements Iterator> {
private ResultSet rs;
protected boolean current = false;
protected boolean endOfRows = false;
private SQLExceptionConverter sec;
private Statement statement = null;
protected ResultSetIterator(ResultSet resultset, SQLExceptionConverter sec) {
this(null, resultset, sec);
}
public ResultSetIterator(Statement stmt, ResultSet resultset, SQLExceptionConverter exceptionConverter) {
this.rs = resultset;
this.sec = exceptionConverter;
this.statement = stmt;
}
protected SQLExceptionConverter getSQLExceptionConverter() {
return sec;
}
public boolean hasNext() {
try {
advance();
return !endOfRows;
}
catch (SQLException e) {
handleSQLException( e );
return false;
}
}
public Map next() {
try {
advance();
if ( endOfRows ) {
throw new NoSuchElementException();
}
current = false;
return convertRow( rs );
}
catch (SQLException e) {
handleSQLException(e);
throw new NoSuchElementException("excpetion occurred " + e);
}
}
abstract protected Throwable handleSQLException(SQLException e);
abstract protected Map convertRow(ResultSet rs) throws SQLException;
public void remove() {
throw new UnsupportedOperationException(
"remove() not possible on ResultSet" );
}
protected void advance() throws SQLException {
if ( !current && !endOfRows ) {
if ( rs.next() ) {
current = true;
endOfRows = false;
}
else {
current = false;
endOfRows = true;
}
}
}
public void close() {
try {
rs.close();
if(statement!=null) {
statement.close();
}
}
catch (SQLException e) {
handleSQLException(e);
}
}
}