/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.function.aggregate;
import java.util.List;
import org.teiid.UserDefinedAggregate;
import org.teiid.api.exception.query.ExpressionEvaluationException;
import org.teiid.api.exception.query.FunctionExecutionException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
import org.teiid.query.function.FunctionDescriptor;
import org.teiid.query.util.CommandContext;
public class UserDefined extends AggregateFunction {
private FunctionDescriptor fd;
private UserDefinedAggregate<?> instance;
private ExposedStateUserDefinedAggregate<?> exposed;
private Object[] values;
public UserDefined(FunctionDescriptor functionDescriptor) throws FunctionExecutionException {
this.fd = functionDescriptor;
this.instance = (UserDefinedAggregate<?>) fd.newInstance();
if (instance instanceof ExposedStateUserDefinedAggregate) {
this.exposed = (ExposedStateUserDefinedAggregate)instance;
}
}
@Override
public void addInputDirect(List<?> tuple, CommandContext commandContext) throws TeiidComponentException,
TeiidProcessingException {
if (values == null) {
values = new Object[argIndexes.length + (fd.requiresContext()?1:0)];
}
if (fd.requiresContext()) {
values[0] = commandContext;
}
for (int i = 0; i < argIndexes.length; i++) {
values[i + (fd.requiresContext()?1:0)] = tuple.get(argIndexes[i]);
}
fd.invokeFunction(values, commandContext, instance);
}
@Override
public void reset() {
instance.reset();
}
@Override
public Object getResult(CommandContext commandContext) throws FunctionExecutionException,
ExpressionEvaluationException, TeiidComponentException,
TeiidProcessingException {
return instance.getResult(commandContext);
}
@Override
public boolean respectsNull() {
return !fd.getMethod().isNullOnNull();
}
public List<? extends Class<?>> getStateTypes() {
if (this.exposed != null) {
return this.exposed.getStateTypes();
}
return null;
}
public void getState(List<Object> state) {
if (this.exposed != null) {
this.exposed.getState(state);
}
}
public int setState(List<?> state, int index) {
if (this.exposed != null) {
return this.exposed.setState(state, index);
}
return 0;
}
}