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/*
* 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.asterix.aql.expression;
import org.apache.asterix.aql.base.Statement;
import org.apache.asterix.aql.expression.visitor.IAqlExpressionVisitor;
import org.apache.asterix.common.exceptions.AsterixException;
import org.apache.asterix.common.functions.FunctionSignature;
import org.apache.hyracks.algebricks.common.utils.Pair;
/**
* Represents the AQL statement for creating a secondary feed.
* A secondary feed is one that derives its data from another (primary/secondary) feed.
*/
public class CreateSecondaryFeedStatement extends CreateFeedStatement implements Statement {
/** The source feed that provides data for this secondary feed. */
private final Pair sourceQName;
public CreateSecondaryFeedStatement(Pair qName, Pair sourceQName,
FunctionSignature appliedFunction, boolean ifNotExists) {
super(qName, appliedFunction, ifNotExists);
this.sourceQName = sourceQName;
}
public String getSourceFeedDataverse() {
return sourceQName.first != null ? sourceQName.first.toString()
: getDataverseName() != null ? getDataverseName().getValue() : null;
}
public String getSourceFeedName() {
return sourceQName.second != null ? sourceQName.second.toString() : null;
}
@Override
public Kind getKind() {
return Kind.CREATE_SECONDARY_FEED;
}
@Override
public R accept(IAqlExpressionVisitor visitor, T arg) throws AsterixException {
return visitor.visitCreateSecondaryFeedStatement(this, arg);
}
}
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