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SelectResultSet.java
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SelectResultSet.java
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package cz.cvut.kbss.ontodriver.jena.query;
import cz.cvut.kbss.ontodriver.exception.VariableNotBoundException;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import org.apache.jena.query.QueryExecution;
import org.apache.jena.query.QuerySolution;
import org.apache.jena.query.ResultSet;
import org.apache.jena.rdf.model.Literal;
import org.apache.jena.rdf.model.RDFNode;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.Objects;
public class SelectResultSet extends AbstractResultSet {
private final QueryExecution execution;
private final ResultSet jenaResult;
private QuerySolution current;
public SelectResultSet(QueryExecution execution, ResultSet jenaResult) {
this.execution = execution;
this.jenaResult = jenaResult;
}
@Override
public int findColumn(String variableName) {
ensureOpen();
return jenaResult.getResultVars().indexOf(variableName);
}
@Override
public int getColumnCount() {
ensureOpen();
return jenaResult.getResultVars().size();
}
@Override
public boolean isBound(int variableIndex) {
ensureState();
return variableIndex >= 0 && variableIndex < jenaResult.getResultVars().size() && current
.get(getVariableAt(variableIndex)) != null;
}
@Override
public boolean isBound(String variableName) {
ensureState();
return jenaResult.getResultVars().contains(variableName) && current.get(variableName) != null;
}
@Override
public boolean getBoolean(int variableIndex) throws JenaDriverException {
ensureState();
return getBoolean(getVariableAt(variableIndex));
}
@Override
public boolean getBoolean(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getBoolean();
}
private Literal getLiteral(String varName) throws JenaDriverException {
Objects.requireNonNull(varName);
assert current != null;
final RDFNode value = getCurrent(varName);
assert value != null;
if (!value.isLiteral()) {
throw new JenaDriverException("Expected value " + value + " to be a literal.");
}
return current.get(varName).asLiteral();
}
private RDFNode getCurrent(String varName) {
final RDFNode value = current.get(varName);
if (value == null) {
throw new VariableNotBoundException("Variable " + varName + " is not bound in the current result row.");
}
return value;
}
@Override
public byte getByte(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getByte();
}
@Override
public byte getByte(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getByte();
}
@Override
public double getDouble(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getDouble();
}
@Override
public double getDouble(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getDouble();
}
@Override
public float getFloat(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getFloat();
}
@Override
public float getFloat(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getFloat();
}
@Override
public int getInt(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getInt();
}
@Override
public int getInt(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getInt();
}
@Override
public long getLong(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getLong();
}
@Override
public long getLong(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getLong();
}
@Override
public Object getObject(int variableIndex) {
ensureState();
assert current != null;
return toObject(getCurrent(getVariableAt(variableIndex)));
}
private Object toObject(RDFNode value) {
assert value != null;
if (value.isLiteral()) {
return value.asLiteral().getValue();
} else {
assert value.isResource();
if (value.isURIResource()) {
return URI.create(value.asResource().getURI());
} else {
return value.asResource().getId().getLabelString();
}
}
}
@Override
public Object getObject(String variableName) {
ensureState();
ensureVariableExists(variableName);
assert current != null;
return toObject(getCurrent(Objects.requireNonNull(variableName)));
}
@Override
public <T> T getObject(int variableIndex, Class<T> cls) throws JenaDriverException {
ensureState();
assert current != null;
return toObject(getCurrent(getVariableAt(variableIndex)), cls);
}
private <T> T toObject(RDFNode value, Class<T> cls) throws JenaDriverException {
Objects.requireNonNull(cls);
if (cls.isAssignableFrom(value.getClass())) {
return cls.cast(value);
}
Object objectValue;
if (value.isLiteral()) {
objectValue = value.asLiteral().getValue();
} else {
assert value.isResource();
if (value.isURIResource()) {
objectValue = URI.create(value.asResource().getURI());
} else {
objectValue = value.asResource().getId().getLabelString();
}
}
if (objectValue != null && cls.isAssignableFrom(objectValue.getClass())) {
return cls.cast(objectValue);
} else {
return buildUsingConstructor(cls, value, objectValue);
}
}
private <T> T buildUsingConstructor(Class<T> cls, RDFNode jenaValue, Object javaValue) throws JenaDriverException {
final Constructor<?>[] constructors = cls.getDeclaredConstructors();
try {
for (Constructor<?> c : constructors) {
if (c.getParameterCount() != 1) {
continue;
}
if (c.getParameterTypes()[0].isAssignableFrom(jenaValue.getClass())) {
return cls.cast(c.newInstance(jenaValue));
}
if (c.getParameterTypes()[0].isAssignableFrom(javaValue.getClass())) {
return cls.cast(c.newInstance(javaValue));
}
}
} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new JenaDriverException("Unable to instantiate class " + cls + " with value " + jenaValue, e);
}
throw new JenaDriverException("No suitable constructor for value " + jenaValue + " found in type " + cls);
}
@Override
public <T> T getObject(String variableName, Class<T> cls) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
assert current != null;
return toObject(getCurrent(variableName), cls);
}
@Override
public short getShort(int variableIndex) throws JenaDriverException {
ensureState();
return getLiteral(getVariableAt(variableIndex)).getShort();
}
@Override
public short getShort(String variableName) throws JenaDriverException {
ensureState();
ensureVariableExists(variableName);
return getLiteral(variableName).getShort();
}
@Override
public String getString(int variableIndex) {
ensureState();
return getString(getVariableAt(variableIndex));
}
private String getVariableAt(int index) {
if (index < 0 || index >= jenaResult.getResultVars().size()) {
throw new IllegalArgumentException("Variable index " + index + " is out of bounds.");
}
return jenaResult.getResultVars().get(index);
}
@Override
public String getString(String variableName) {
ensureState();
ensureVariableExists(variableName);
assert current != null;
final RDFNode value = getCurrent(variableName);
if (value.isResource()) {
return value.asResource().getURI();
} else {
return value.asLiteral().getString();
}
}
private void ensureVariableExists(String name) {
assert current != null;
if (!current.contains(name)) {
throw new IllegalArgumentException("Variable \'" + name + "\' not found in the result set.");
}
}
@Override
public boolean hasNext() {
ensureOpen();
return jenaResult.hasNext();
}
@Override
public void next() {
super.next();
this.current = jenaResult.next();
}
@Override
public void close() throws JenaDriverException {
try {
execution.close();
super.close();
} catch (RuntimeException e) {
throw new JenaDriverException("Unable to close result set.", e);
}
}
}