/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.drill.exec.planner.logical;
import java.util.Set;
import org.apache.drill.common.logical.LogicalPlan;
import org.apache.drill.common.logical.LogicalPlanBuilder;
import org.apache.drill.common.logical.PlanProperties.Generator.ResultMode;
import org.apache.drill.common.logical.PlanProperties.PlanType;
import org.apache.drill.common.logical.data.LogicalOperator;
import org.apache.drill.common.logical.data.visitors.AbstractLogicalVisitor;
import org.eigenbase.rel.RelNode;
import com.google.common.collect.Sets;
/**
* Context for converting a tree of {@link DrillRel} nodes into a Drill logical plan.
*/
public class DrillImplementor {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DrillImplementor.class);
private Set<DrillTable> tables = Sets.newHashSet();
private Set<String> storageEngineNames = Sets.newHashSet();
private LogicalPlanBuilder planBuilder = new LogicalPlanBuilder();
private LogicalPlan plan;
private final DrillParseContext context;
public DrillImplementor(DrillParseContext context, ResultMode mode) {
planBuilder.planProperties(PlanType.APACHE_DRILL_LOGICAL, 1, DrillImplementor.class.getName(), "", mode);
this.context = context;
}
public DrillParseContext getContext(){
return context;
}
public void registerSource(DrillTable table){
if(tables.add(table) && storageEngineNames.add(table.getStorageEngineName())){
planBuilder.addStorageEngine(table.getStorageEngineName(), table.getStorageEngineConfig());
}
}
public void go(DrillRel root) {
LogicalOperator rootLOP = root.implement(this);
rootLOP.accept(new AddOpsVisitor(), null);
}
public LogicalPlan getPlan(){
if(plan == null){
plan = planBuilder.build();
planBuilder = null;
}
return plan;
}
public LogicalOperator visitChild(DrillRel parent, int ordinal, RelNode child) {
return ((DrillRel) child).implement(this);
}
private class AddOpsVisitor extends AbstractLogicalVisitor<Void, Void, RuntimeException> {
@Override
public Void visitOp(LogicalOperator op, Void value) throws RuntimeException {
planBuilder.addLogicalOperator(op);
for(LogicalOperator o : op){
o.accept(this, null);
}
return null;
}
}
}