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AskResultSet.java
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AskResultSet.java
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/**
* Copyright (C) 2019 Czech Technical University in Prague
* <p>
* 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.
* <p>
* 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.owlapi.query;
import cz.cvut.kbss.ontodriver.Statement;
import cz.cvut.kbss.owl2query.model.QueryResult;
import org.semanticweb.owlapi.model.OWLObject;
class AskResultSet extends AbstractResultSet {
private final boolean result;
private boolean nextCalled = false;
public AskResultSet(QueryResult<OWLObject> queryResult, Statement statement) {
super(statement);
this.result = !queryResult.isEmpty();
}
@Override
public int findColumn(String columnLabel) {
return 0;
}
@Override
public int getColumnCount() {
return 1;
}
@Override
public boolean isBound(int variableIndex) {
ensureState();
// We do not care about index/name in ASK result set
return true;
}
@Override
public boolean isBound(String variableName) {
ensureState();
// We do not care about index/name in ASK result set
return true;
}
@Override
public void first() {
// Do nothing
}
@Override
public boolean getBoolean(int columnIndex) {
ensureState();
return result;
}
private void ensureState() {
ensureOpen();
if (!nextCalled) {
throw new IllegalStateException(
"Next has to be called before attempting to get any value from the result set.");
}
}
@Override
public boolean getBoolean(String columnLabel) {
ensureState();
return result;
}
@Override
public byte getByte(int columnIndex) {
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) {
ensureState();
throw unsupported("byte");
}
@Override
public double getDouble(int columnIndex) {
ensureState();
throw unsupported("double");
}
@Override
public double getDouble(String columnLabel) {
ensureState();
throw unsupported("double");
}
@Override
public float getFloat(int columnIndex) {
ensureState();
throw unsupported("float");
}
@Override
public float getFloat(String columnLabel) {
ensureState();
throw unsupported("float");
}
@Override
public int getInt(int columnIndex) {
ensureState();
throw unsupported("int");
}
@Override
public int getInt(String columnLabel) {
ensureState();
throw unsupported("int");
}
@Override
public long getLong(int columnIndex) {
ensureState();
throw unsupported("long");
}
@Override
public long getLong(String columnLabel) {
ensureState();
throw unsupported("long");
}
@Override
public Object getObject(int columnIndex) {
ensureState();
return result;
}
@Override
public Object getObject(String columnLabel) {
ensureState();
return result;
}
@Override
public <T> T getObject(int columnIndex, Class<T> cls) {
ensureState();
if (cls.isAssignableFrom(Boolean.class)) {
return cls.cast(result);
}
if (cls.isAssignableFrom(String.class)) {
return cls.cast(Boolean.toString(result));
}
throw unsupported(cls.getSimpleName());
}
@Override
public <T> T getObject(String columnLabel, Class<T> cls) {
return getObject(0, cls);
}
@Override
public int getRowIndex() {
return 0;
}
@Override
public short getShort(int columnIndex) {
ensureState();
throw unsupported("short");
}
@Override
public short getShort(String columnLabel) {
ensureState();
throw unsupported("short");
}
@Override
public String getString(int columnIndex) {
ensureState();
return Boolean.toString(result);
}
@Override
public String getString(String columnLabel) {
ensureState();
return Boolean.toString(result);
}
@Override
public boolean isFirst() {
return true;
}
@Override
public boolean hasNext() {
return !nextCalled;
}
@Override
public void last() {
// do nothing
}
@Override
public void next() {
if (!hasNext()) {
throw new IllegalStateException("No more elements in this result set.");
}
this.nextCalled = true;
}
@Override
public void previous() {
// Do nothing
}
@Override
public void relative(int rows) {
throw new UnsupportedOperationException("Row-based navigation not supported by ASK result set.");
}
@Override
public void setRowIndex(int rowIndex) {
throw new UnsupportedOperationException("Row-based navigation not supported by ASK result set.");
}
}