/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.sql.planner;
import com.facebook.presto.connector.ConnectorId;
import com.facebook.presto.execution.Output;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.planner.plan.PlanVisitor;
import com.facebook.presto.sql.planner.plan.TableWriterNode;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkState;
public class OutputExtractor
{
public Optional<Output> extractOutput(PlanNode root)
{
Visitor visitor = new Visitor();
root.accept(visitor, null);
if (visitor.getConnectorId() == null) {
return Optional.empty();
}
return Optional.of(new Output(
visitor.getConnectorId(),
visitor.getSchemaTableName().getSchemaName(),
visitor.getSchemaTableName().getTableName()));
}
private class Visitor
extends PlanVisitor<Void, Void>
{
private ConnectorId connectorId = null;
private SchemaTableName schemaTableName = null;
@Override
public Void visitTableWriter(TableWriterNode node, Void context)
{
TableWriterNode.WriterTarget writerTarget = node.getTarget();
if (writerTarget instanceof TableWriterNode.CreateHandle) {
connectorId = ((TableWriterNode.CreateHandle) writerTarget).getHandle().getConnectorId();
checkState(schemaTableName == null || schemaTableName.equals(((TableWriterNode.CreateHandle) writerTarget).getSchemaTableName()),
"cannot have more than a single create, insert or delete in a query");
schemaTableName = ((TableWriterNode.CreateHandle) writerTarget).getSchemaTableName();
}
if (writerTarget instanceof TableWriterNode.InsertHandle) {
connectorId = ((TableWriterNode.InsertHandle) writerTarget).getHandle().getConnectorId();
checkState(schemaTableName == null || schemaTableName.equals(((TableWriterNode.InsertHandle) writerTarget).getSchemaTableName()),
"cannot have more than a single create, insert or delete in a query");
schemaTableName = ((TableWriterNode.InsertHandle) writerTarget).getSchemaTableName();
}
if (writerTarget instanceof TableWriterNode.DeleteHandle) {
connectorId = ((TableWriterNode.DeleteHandle) writerTarget).getHandle().getConnectorId();
checkState(schemaTableName == null || schemaTableName.equals(((TableWriterNode.DeleteHandle) writerTarget).getSchemaTableName()),
"cannot have more than a single create, insert or delete in a query");
schemaTableName = ((TableWriterNode.DeleteHandle) writerTarget).getSchemaTableName();
}
return null;
}
@Override
protected Void visitPlan(PlanNode node, Void context)
{
for (PlanNode child : node.getSources()) {
child.accept(this, context);
}
return null;
}
public ConnectorId getConnectorId()
{
return connectorId;
}
public SchemaTableName getSchemaTableName()
{
return schemaTableName;
}
}
}