/*
* 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.projectors.fetch;
/**
* Utility class to pack/unpack a fetchId.
* <p>
* A fetchId is a long which contains a readerId and a docId.
*
* readerIds are generated in the planner-phase. They're used to identify a shard/indexReader.
* docIds are part of the lucene api, where they're used to identify documents within an IndexReader.
* </p>
*
* <pre>
* 4 bytes | 4 bytes
* | |
* readerId docId
* </pre>
*/
public final class FetchId {
static int decodeReaderId(long fetchId) {
return (int) (fetchId >> 32);
}
static int decodeDocId(long fetchId) {
return (int) fetchId;
}
public static long encode(int readerId, int docId) {
return ((long) readerId << 32) | (docId & 0xffffffffL);
}
}