tech.tablesaw.index.IntIndex 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 com.google.common.base.Preconditions;
import it.unimi.dsi.fastutil.ints.Int2ObjectAVLTreeMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectSortedMap;
import it.unimi.dsi.fastutil.ints.IntArrayList;
import tech.tablesaw.api.ColumnType;
import tech.tablesaw.api.DateColumn;
import tech.tablesaw.api.IntColumn;
import tech.tablesaw.api.TimeColumn;
import tech.tablesaw.columns.dates.PackedLocalDate;
import tech.tablesaw.columns.times.PackedLocalTime;
import tech.tablesaw.selection.BitmapBackedSelection;
import tech.tablesaw.selection.Selection;
import java.time.LocalDate;
import java.time.LocalTime;
/**
* An index for four-byte integer and integer backed columns (date, category, time)
*/
public class IntIndex implements Index {
private final Int2ObjectAVLTreeMap index;
public IntIndex(DateColumn column) {
int sizeEstimate = Integer.min(1_000_000, column.size() / 100);
Int2ObjectOpenHashMap tempMap = new Int2ObjectOpenHashMap<>(sizeEstimate);
for (int i = 0; i < column.size(); i++) {
int value = column.getIntInternal(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 Int2ObjectAVLTreeMap<>(tempMap);
}
public IntIndex(IntColumn column) {
Preconditions.checkArgument(column.type().equals(ColumnType.INTEGER),
"Int indexing only allowed on INTEGER numeric columns");
int sizeEstimate = Integer.min(1_000_000, column.size() / 100);
Int2ObjectOpenHashMap tempMap = new Int2ObjectOpenHashMap<>(sizeEstimate);
for (int i = 0; i < column.size(); i++) {
int value = column.getInt(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 Int2ObjectAVLTreeMap<>(tempMap);
}
public IntIndex(TimeColumn column) {
int sizeEstimate = Integer.min(1_000_000, column.size() / 100);
Int2ObjectOpenHashMap tempMap = new Int2ObjectOpenHashMap<>(sizeEstimate);
for (int i = 0; i < column.size(); i++) {
int value = column.getIntInternal(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 Int2ObjectAVLTreeMap<>(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(int value) {
Selection selection = new BitmapBackedSelection();
IntArrayList list = index.get(value);
if (list != null) {
addAllToSelection(list, selection);
}
return selection;
}
public Selection get(LocalTime value) {
return get(PackedLocalTime.pack(value));
}
public Selection get(LocalDate value) {
return get(PackedLocalDate.pack(value));
}
public Selection atLeast(int value) {
Selection selection = new BitmapBackedSelection();
Int2ObjectSortedMap tail = index.tailMap(value);
for (IntArrayList keys : tail.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection atLeast(LocalTime value) {
return atLeast(PackedLocalTime.pack(value));
}
public Selection atLeast(LocalDate value) {
return atLeast(PackedLocalDate.pack(value));
}
public Selection greaterThan(int value) {
Selection selection = new BitmapBackedSelection();
Int2ObjectSortedMap tail = index.tailMap(value + 1);
for (IntArrayList keys : tail.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection greaterThan(LocalTime value) {
return greaterThan(PackedLocalTime.pack(value));
}
public Selection greaterThan(LocalDate value) {
return greaterThan(PackedLocalDate.pack(value));
}
public Selection atMost(int value) {
Selection selection = new BitmapBackedSelection();
Int2ObjectSortedMap head = index.headMap(value + 1); // we add 1 to get values equal to the arg
for (IntArrayList keys : head.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection atMost(LocalTime value) {
return atMost(PackedLocalTime.pack(value));
}
public Selection atMost(LocalDate value) {
return atMost(PackedLocalDate.pack(value));
}
public Selection lessThan(int value) {
Selection selection = new BitmapBackedSelection();
Int2ObjectSortedMap head = index.headMap(value); // we add 1 to get values equal to the arg
for (IntArrayList keys : head.values()) {
addAllToSelection(keys, selection);
}
return selection;
}
public Selection lessThan(LocalTime value) {
return lessThan(PackedLocalTime.pack(value));
}
public Selection lessThan(LocalDate value) {
return lessThan(PackedLocalDate.pack(value));
}
}