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AbstractResultSet.java
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AbstractResultSet.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.sesame.query;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.Statement;
import java.util.NoSuchElementException;
import java.util.Observer;
abstract class AbstractResultSet implements ResultSet {
private final Statement statement;
private int index;
private boolean open;
AbstractResultSet(Statement statement) {
assert statement != null;
this.statement = statement;
this.index = -1;
this.open = true;
}
@Override
public boolean isOpen() {
return open;
}
@Override
public int getRowIndex() throws OntoDriverException {
ensureOpen();
return index;
}
@Override
public Statement getStatement() throws OntoDriverException {
ensureOpen();
return statement;
}
@Override
public boolean isFirst() throws OntoDriverException {
ensureOpen();
return index == 0;
}
void ensureOpen() {
if (!open) {
throw new IllegalStateException("The result set is closed!");
}
}
@Override
public void close() throws OntoDriverException {
this.open = false;
}
@Override
public void first() throws OntoDriverException {
throw new UnsupportedOperationException(
"Returning to the first row is not supported by this result set.");
}
@Override
public void previous() throws OntoDriverException {
throw new UnsupportedOperationException("Going back is not supported by this result set.");
}
@Override
public void registerObserver(Observer observer) throws OntoDriverException {
// TODO Auto-generated method stub
}
@Override
public void relative(int rows) throws OntoDriverException {
setRowIndex(index + rows);
}
@Override
public void last() throws OntoDriverException {
ensureOpen();
while (hasNext()) {
next();
}
}
@Override
public void next() throws OntoDriverException {
ensureOpen();
if (!hasNext()) {
throw new NoSuchElementException();
}
index++;
}
@Override
public void setRowIndex(int rowIndex) throws OntoDriverException {
ensureOpen();
if (rowIndex < index) {
throw new UnsupportedOperationException(
"Going back in this result set is not supported.");
}
if (rowIndex == index) {
return;
}
while (index <= rowIndex) {
next();
}
}
}