CavalliumDBEngine/src/main/java/it/cavallium/dbengine/lucene/LinearPageLimits.java

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package it.cavallium.dbengine.lucene;
2021-09-21 02:01:02 +02:00
/**
* <pre>y = (x * factor) + firstPageLimit</pre>
*/
public class LinearPageLimits implements PageLimits {
private static final double DEFAULT_FACTOR = 0.5d;
private final double factor;
private final double firstPageLimit;
private final double maxItemsPerPage;
public LinearPageLimits() {
this(DEFAULT_FACTOR, DEFAULT_MIN_ITEMS_PER_PAGE);
}
public LinearPageLimits(double factor) {
this(factor, DEFAULT_MIN_ITEMS_PER_PAGE);
}
public LinearPageLimits(double factor, int firstPageLimit) {
this(factor, firstPageLimit, DEFAULT_MAX_ITEMS_PER_PAGE);
}
public LinearPageLimits(double factor, int firstPageLimit, int maxItemsPerPage) {
this.factor = factor;
this.firstPageLimit = firstPageLimit;
this.maxItemsPerPage = maxItemsPerPage;
}
@Override
public int getPageLimit(int pageIndex) {
double min = Math.min(maxItemsPerPage, firstPageLimit + (pageIndex * factor));
assert min > 0d;
return (int) min;
}
}