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AskResultSet.java
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AskResultSet.java
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/**
* Copyright (C) 2020 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.Statement;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
public class AskResultSet extends AbstractResultSet {
private final boolean result;
public AskResultSet(boolean result, Statement statement) {
super(statement);
this.result = result;
}
@Override
public int findColumn(String columnLabel) {
return 0;
}
@Override
public int getColumnCount() {
return 1;
}
@Override
public boolean isBound(int variableIndex) {
// Return always true, as we do not care about index/name for ASK results
return true;
}
@Override
public boolean isBound(String variableName) {
// Return always true, as we do not care about index/name for ASK results
return true;
}
// We discard column index and column name, because in a boolean result, there is no such concept. Therefore,
// the result is returned for any column index and column name.
@Override
public boolean getBoolean(int columnIndex) throws OntoDriverException {
ensureState();
return result;
}
private void ensureState() throws OntoDriverException {
ensureOpen();
if (!isFirst()) {
throw new IllegalStateException("Must call next before getting the first value.");
}
}
@Override
public boolean getBoolean(String columnLabel) throws OntoDriverException {
ensureState();
return result;
}
@Override
public byte getByte(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("byte");
}
private static UnsupportedOperationException unsupported(String type) {
return new UnsupportedOperationException("ASK query results cannot return " + type + "values.");
}
@Override
public byte getByte(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("byte");
}
@Override
public double getDouble(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("double");
}
@Override
public double getDouble(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("double");
}
@Override
public float getFloat(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("float");
}
@Override
public float getFloat(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("float");
}
@Override
public int getInt(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("int");
}
@Override
public int getInt(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("int");
}
@Override
public long getLong(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("long");
}
@Override
public long getLong(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("long");
}
@Override
public Object getObject(int columnIndex) throws OntoDriverException {
ensureState();
return result;
}
@Override
public Object getObject(String columnLabel) throws OntoDriverException {
ensureState();
return result;
}
@Override
public <T> T getObject(int columnIndex, Class<T> cls) throws OntoDriverException {
ensureState();
return toType(cls);
}
@Override
public <T> T getObject(String columnLabel, Class<T> cls) throws OntoDriverException {
ensureState();
return toType(cls);
}
private <T> T toType(Class<T> type) throws OntoDriverException {
if (type.isAssignableFrom(Boolean.class)) {
return type.cast(result);
}
if (type.isAssignableFrom(String.class)) {
return type.cast(getString(0));
}
throw new SesameDriverException("Unable to return boolean result as type " + type);
}
@Override
public short getShort(int columnIndex) throws OntoDriverException {
ensureState();
throw unsupported("short");
}
@Override
public short getShort(String columnLabel) throws OntoDriverException {
ensureState();
throw unsupported("short");
}
@Override
public String getString(int columnIndex) throws OntoDriverException {
ensureState();
return Boolean.toString(result);
}
@Override
public String getString(String columnLabel) throws OntoDriverException {
ensureState();
return Boolean.toString(result);
}
@Override
public boolean hasNext() throws OntoDriverException {
ensureOpen();
return !isFirst();
}
}