/*
* 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.flink.compiler.plan;
import static org.apache.flink.compiler.plan.PlanNode.SourceAndDamReport.FOUND_SOURCE;
import static org.apache.flink.compiler.plan.PlanNode.SourceAndDamReport.NOT_FOUND;
import java.util.Collections;
import org.apache.flink.api.common.typeutils.TypeSerializerFactory;
import org.apache.flink.compiler.dag.DataSourceNode;
import org.apache.flink.compiler.dataproperties.GlobalProperties;
import org.apache.flink.compiler.dataproperties.LocalProperties;
import org.apache.flink.runtime.operators.DriverStrategy;
import org.apache.flink.util.Visitor;
/**
* Plan candidate node for data flow sources that have no input and no special strategies.
*/
public class SourcePlanNode extends PlanNode {
private TypeSerializerFactory<?> serializer;
/**
* Constructs a new source candidate node that uses <i>NONE</i> as its local strategy.
*
* @param template The template optimizer node that this candidate is created for.
*/
public SourcePlanNode(DataSourceNode template, String nodeName) {
super(template, nodeName, DriverStrategy.NONE);
this.globalProps = new GlobalProperties();
this.localProps = new LocalProperties();
updatePropertiesWithUniqueSets(template.getUniqueFields());
}
// --------------------------------------------------------------------------------------------
public DataSourceNode getDataSourceNode() {
return (DataSourceNode) this.template;
}
/**
* Gets the serializer from this PlanNode.
*
* @return The serializer.
*/
public TypeSerializerFactory<?> getSerializer() {
return serializer;
}
/**
* Sets the serializer for this PlanNode.
*
* @param serializer The serializer to set.
*/
public void setSerializer(TypeSerializerFactory<?> serializer) {
this.serializer = serializer;
}
// --------------------------------------------------------------------------------------------
@Override
public void accept(Visitor<PlanNode> visitor) {
if (visitor.preVisit(this)) {
visitor.postVisit(this);
}
}
@Override
public Iterable<PlanNode> getPredecessors() {
return Collections.<PlanNode>emptyList();
}
@Override
public Iterable<Channel> getInputs() {
return Collections.<Channel>emptyList();
}
@Override
public SourceAndDamReport hasDamOnPathDownTo(PlanNode source) {
if (source == this) {
return FOUND_SOURCE;
} else {
return NOT_FOUND;
}
}
}