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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.predicate.index;
import com.yahoo.search.predicate.utils.PostingListSearch;
/**
* Shared implementation for posting lists that may have multiple intervals.
*
* @author Magnar Nedland
* @author bjorncs
*/
public abstract class MultiIntervalPostingList implements PostingList {
private final int[] docIds;
private final int[] dataRefs;
private final long subquery;
private final int length;
private int currentIndex;
private int currentDocId;
public MultiIntervalPostingList(int[] docIds, int[] dataRefs, long subquery) {
this.docIds = docIds;
this.dataRefs = dataRefs;
this.subquery = subquery;
this.length = docIds.length;
this.currentIndex = 0;
this.currentDocId = -1;
}
@Override
public final boolean nextDocument(int docId) {
int index = currentIndex;
index = PostingListSearch.interpolationSearch(docIds, index, length, docId);
if (index == length) {
return false;
}
this.currentDocId = docIds[index];
this.currentIndex = index;
assert currentDocId > docId;
return true;
}
@Override
public final boolean prepareIntervals() {
return prepareIntervals(dataRefs[currentIndex]);
}
protected abstract boolean prepareIntervals(int dataRef);
@Override
public final int size() {
return length;
}
@Override
public final int getDocId() {
return currentDocId;
}
@Override
public final int[] getDocIds() {
return docIds;
}
@Override
public final long getSubquery() {
return subquery;
}
}
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