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package org.hsqldb;
import org.hsqldb.types.Type;
import org.hsqldb.result.Result;
import org.hsqldb.store.ValuePool;
import java.lang.reflect.InvocationTargetException;
/**
* Implementation of SQL-invoked user-defined function calls - PSM and JRT
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.9.0
*/
public class FunctionSQLInvoked extends Expression {
RoutineSchema routineSchema;
Routine routine;
FunctionSQLInvoked(RoutineSchema routineSchema) {
super(OpTypes.FUNCTION);
this.routineSchema = routineSchema;
}
public void setArguments(Expression[] newNodes) {
this.nodes = newNodes;
}
public void resolveTypes(Session session, Expression parent) {
Type[] types = new Type[nodes.length];
for (int i = 0; i < nodes.length; i++) {
Expression e = nodes[i];
e.resolveTypes(session, this);
types[i] = e.dataType;
}
routine = routineSchema.getSpecificRoutine(types);
for (int i = 0; i < nodes.length; i++) {
if (nodes[i].dataType == null) {
nodes[i].dataType = routine.getParameterTypes()[i];
}
}
dataType = routine.getReturnType();
}
public Object getValue(Session session) {
int variableCount = routine.getVariableCount();
Result result;
int extraArg = routine.javaMethodWithConnection ? 1
: 0;
Object[] data = ValuePool.emptyObjectArray;
Object returnValue = null;
boolean push = routine.isPSM() || routine.dataImpact != Routine.NO_SQL;
if (extraArg + nodes.length > 0) {
data = new Object[nodes.length + extraArg];
if (extraArg > 0) {
data[0] = session.getInternalConnection();
}
}
for (int i = 0; i < nodes.length; i++) {
Expression e = nodes[i];
Object value = e.getValue(session, e.dataType);
if (value == null) {
if (routine.isNullInputOutput()) {
return null;
}
if (!routine.parameterNullable[i]) {
throw Error.error(ErrorCode.X_39004);
}
}
if (routine.isPSM()) {
data[i] = value;
} else {
data[i + extraArg] = e.dataType.convertSQLToJava(session,
value);
}
}
if (push) {
session.sessionContext.push();
}
if (routine.isPSM()) {
session.sessionContext.routineArguments = data;
session.sessionContext.routineVariables =
ValuePool.emptyObjectArray;
if (variableCount > 0) {
session.sessionContext.routineVariables =
new Object[variableCount];
}
result = routine.statement.execute(session);
if (result.isError()) {}
else if (result.isSimpleValue()) {
returnValue = result.getValueObject();
} else {
result = Result.newErrorResult(
Error.error(ErrorCode.X_2F005, routine.getName().name),
null);
}
} else {
try {
returnValue = routine.javaMethod.invoke(null, data);
if (routine.returnsTable()) {
// convert ResultSet to table
} else {
returnValue = dataType.convertJavaToSQL(session,
returnValue);
}
result = Result.updateZeroResult;
} catch (InvocationTargetException e) {
result = Result.newErrorResult(
Error.error(ErrorCode.X_46000, routine.getName().name),
null);
} catch (IllegalAccessException e) {
result = Result.newErrorResult(
Error.error(ErrorCode.X_46000, routine.getName().name),
null);
} catch (Throwable e) {
result = Result.newErrorResult(
Error.error(ErrorCode.X_46000, routine.getName().name),
null);
}
}
if (push) {
if (result.isError()) {
session.rollbackToSavepoint();
}
session.sessionContext.pop();
}
if (result.isError()) {
throw result.getException();
}
return returnValue;
}
public String getSQL() {
return Tokens.T_FUNCTION;
}
public String describe(Session session) {
return super.describe(session);
}
}