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AskResultSet.java
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AskResultSet.java
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/**
* Copyright (C) 2022 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.jena.query;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Objects;
public class AskResultSet extends AbstractResultSet {
private final boolean result;
public AskResultSet(boolean result) {
this.result = result;
}
@Override
public int findColumn(String columnLabel) {
return 0;
}
@Override
public int getColumnCount() {
return 1;
}
@Override
public boolean isBound(int variableIndex) {
// ASK query variables are always bound
return true;
}
@Override
public boolean isBound(String variableName) {
// ASK query variables are always bound
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) {
ensureState();
return result;
}
@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) throws OntoDriverException {
return toObject(cls);
}
private <T> T toObject(Class<T> cls) throws JenaDriverException {
ensureState();
Objects.requireNonNull(cls);
if (cls.isAssignableFrom(Boolean.class)) {
return cls.cast(result);
}
if (cls.isAssignableFrom(String.class)) {
return cls.cast(Boolean.toString(result));
}
return buildUsingConstructor(cls);
}
private <T> T buildUsingConstructor(Class<T> cls) throws JenaDriverException {
try {
for (Constructor<?> c : cls.getDeclaredConstructors()) {
if (c.getParameterCount() != 1) {
continue;
}
final Class<?> paramType = c.getParameterTypes()[0];
if (paramType.isAssignableFrom(Boolean.class) || paramType.isAssignableFrom(boolean.class)) {
return cls.cast(c.newInstance(result));
} else if (paramType.isAssignableFrom(String.class)) {
return cls.cast(c.newInstance(Boolean.toString(result)));
}
}
} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new JenaDriverException("Unable to instantiate class " + cls + " with value " + result, e);
}
throw new JenaDriverException("No suitable constructor for value " + result + " found in type " + cls);
}
@Override
public <T> T getObject(String columnLabel, Class<T> cls) throws OntoDriverException {
return toObject(cls);
}
@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 hasNext() {
ensureOpen();
return getRowIndex() == -1;
}
}