/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.operation.reference.doc.lucene;
import com.google.common.base.Throwables;
import io.crate.metadata.doc.DocSysColumns;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import java.io.IOException;
public class VersionCollectorExpression extends LuceneCollectorExpression<Long> {
private NumericDocValues versions = null;
private long value;
public VersionCollectorExpression() {
super(DocSysColumns.VERSION.name());
}
@Override
public void setNextReader(LeafReaderContext reader) {
try {
versions = reader.reader().getNumericDocValues(columnName);
} catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
public void setNextDocId(int doc) {
if (versions != null) {
value = versions.get(doc);
}
}
@Override
public Long value() {
if (versions == null) {
return null;
}
return value;
}
}