tech.tablesaw.index.FloatIndex Maven / Gradle / Ivy
/*
* Licensed 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 tech.tablesaw.index;
import it.unimi.dsi.fastutil.floats.Float2ObjectAVLTreeMap;
import it.unimi.dsi.fastutil.floats.Float2ObjectOpenHashMap;
import it.unimi.dsi.fastutil.floats.Float2ObjectSortedMap;
import it.unimi.dsi.fastutil.ints.IntArrayList;
import tech.tablesaw.api.FloatColumn;
import tech.tablesaw.util.BitmapBackedSelection;
import tech.tablesaw.util.Selection;
/**
* An index for four-byte floating point columns
*/
public class FloatIndex {
private final Float2ObjectAVLTreeMap index;
public FloatIndex(FloatColumn column) {
int sizeEstimate = Integer.min(1_000_000, column.size() / 100);
Float2ObjectOpenHashMap tempMap = new Float2ObjectOpenHashMap<>(sizeEstimate);
for (int i = 0; i < column.size(); i++) {
float value = column.get(i);
IntArrayList recordIds = tempMap.get(value);
if (recordIds == null) {
recordIds = new IntArrayList();
recordIds.add(i);
tempMap.trim();
tempMap.put(value, recordIds);
} else {
recordIds.add(i);
}
}
index = new Float2ObjectAVLTreeMap<>(tempMap);
}
private static void addAllToSelection(IntArrayList tableKeys, Selection selection) {
for (int i : tableKeys) {
selection.add(i);
}
}
/**
* Returns a bitmap containing row numbers of all cells matching the given int
*
* @param value This is a 'key' from the index perspective, meaning it is a value from the standpoint of the column
*/
public Selection get(float value) {
Selection selection = new BitmapBackedSelection();
IntArrayList list = index.get(value);
addAllToSelection(list, selection);
return selection;
}
public Selection atLeast(float value) {
Selection selection = new BitmapBackedSelection();
Float2ObjectSortedMap tail = index.tailMap(value);
for (IntArrayList keys : tail.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection greaterThan(float value) {
Selection selection = new BitmapBackedSelection();
Float2ObjectSortedMap tail = index.tailMap(value + 0.000001f);
for (IntArrayList keys : tail.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection atMost(float value) {
Selection selection = new BitmapBackedSelection();
Float2ObjectSortedMap head = index.headMap(value + 0.000001f); // we add 1 to get values equal
// to the arg
for (IntArrayList keys : head.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection lessThan(float value) {
Selection selection = new BitmapBackedSelection();
Float2ObjectSortedMap head = index.headMap(value); // we add 1 to get values equal to the arg
for (IntArrayList keys : head.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
}