tech.tablesaw.api.DateTimeColumn 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.api;
import com.google.common.base.Preconditions;
import it.unimi.dsi.fastutil.ints.IntComparator;
import it.unimi.dsi.fastutil.longs.LongArrayList;
import it.unimi.dsi.fastutil.longs.LongArrays;
import it.unimi.dsi.fastutil.longs.LongComparator;
import it.unimi.dsi.fastutil.longs.LongIterator;
import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
import it.unimi.dsi.fastutil.longs.LongSet;
import tech.tablesaw.columns.AbstractColumn;
import tech.tablesaw.columns.Column;
import tech.tablesaw.columns.StringParser;
import tech.tablesaw.columns.datetimes.DateTimeColumnFormatter;
import tech.tablesaw.columns.datetimes.DateTimeColumnType;
import tech.tablesaw.columns.datetimes.DateTimeFillers;
import tech.tablesaw.columns.datetimes.DateTimeFilters;
import tech.tablesaw.columns.datetimes.DateTimeMapFunctions;
import tech.tablesaw.columns.datetimes.PackedLocalDateTime;
import tech.tablesaw.selection.Selection;
import tech.tablesaw.sorting.comparators.DescendingLongComparator;
import java.nio.ByteBuffer;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Supplier;
import static tech.tablesaw.api.ColumnType.LOCAL_DATE_TIME;
/**
* A column in a table that contains long-integer encoded (packed) local date-time values
*/
public class DateTimeColumn extends AbstractColumn
implements DateTimeMapFunctions, DateTimeFilters, DateTimeFillers, Iterable {
public static final long MISSING_VALUE = (Long) ColumnType.LOCAL_DATE_TIME.getMissingValue();
private final LongComparator reverseLongComparator = DescendingLongComparator.instance();
private LongArrayList data;
private final IntComparator comparator = (r1, r2) -> {
long f1 = getPackedDateTime(r1);
long f2 = getPackedDateTime(r2);
return Long.compare(f1, f2);
};
private DateTimeColumnFormatter printFormatter = new DateTimeColumnFormatter();
public static boolean valueIsMissing(long value) {
return MISSING_VALUE == value;
}
@Override
public boolean isMissing(int rowNumber) {
return valueIsMissing(getLongInternal(rowNumber));
}
public static DateTimeColumn create(String name) {
return create(name, DEFAULT_ARRAY_SIZE);
}
public static DateTimeColumn create(String name, int initialSize) {
return new DateTimeColumn(name, new LongArrayList(initialSize));
}
public static DateTimeColumn create(String name, List data) {
DateTimeColumn column = new DateTimeColumn(name, new LongArrayList(data.size()));
for (LocalDateTime date : data) {
column.append(date);
}
return column;
}
public static DateTimeColumn create(String name, LocalDateTime[] data) {
DateTimeColumn column = new DateTimeColumn(name, new LongArrayList(data.length));
for (LocalDateTime date : data) {
column.append(date);
}
return column;
}
private DateTimeColumn(String name, LongArrayList data) {
super(LOCAL_DATE_TIME, name);
this.data = data;
}
@Override
public DateTimeColumn removeMissing() {
DateTimeColumn noMissing = emptyCopy();
LongIterator iterator = longIterator();
while(iterator.hasNext()) {
long i = iterator.nextLong();
if (!valueIsMissing(i)) {
noMissing.appendInternal(i);
}
}
return noMissing;
}
public boolean contains(LocalDateTime dateTime) {
long dt = PackedLocalDateTime.pack(dateTime);
return data().contains(dt);
}
public DateTimeColumn where(Selection selection) {
return (DateTimeColumn) subset(selection);
}
public void setPrintFormatter(DateTimeFormatter dateTimeFormatter, String missingValueString) {
Preconditions.checkNotNull(dateTimeFormatter);
Preconditions.checkNotNull(missingValueString);
this.printFormatter = new DateTimeColumnFormatter(dateTimeFormatter, missingValueString);
}
public void setPrintFormatter(DateTimeFormatter dateTimeFormatter) {
Preconditions.checkNotNull(dateTimeFormatter);
this.printFormatter = new DateTimeColumnFormatter(dateTimeFormatter);
}
public void setPrintFormatter(DateTimeColumnFormatter formatter) {
Preconditions.checkNotNull(formatter);
this.printFormatter = formatter;
}
@Override
public DateTimeColumn lag(int n) {
int srcPos = n >= 0 ? 0 : 0 - n;
long[] dest = new long[size()];
int destPos = n <= 0 ? 0 : n;
int length = n >= 0 ? size() - n : size() + n;
for (int i = 0; i < size(); i++) {
dest[i] = MISSING_VALUE;
}
System.arraycopy(data.toLongArray(), srcPos, dest, destPos, length);
DateTimeColumn copy = emptyCopy(size());
copy.data = new LongArrayList(dest);
copy.setName(name() + " lag(" + n + ")");
return copy;
}
@Override
public DateTimeColumn appendCell(String stringValue) {
appendInternal(PackedLocalDateTime.pack(DateTimeColumnType.DEFAULT_PARSER.parse(stringValue)));
return this;
}
@Override
public DateTimeColumn appendCell(String stringValue, StringParser parser) {
appendInternal(PackedLocalDateTime.pack((LocalDateTime) parser.parse(stringValue)));
return this;
}
public DateTimeColumn append(LocalDateTime dateTime) {
if (dateTime != null) {
final long dt = PackedLocalDateTime.pack(dateTime);
appendInternal(dt);
} else {
appendInternal(MISSING_VALUE);
}
return this;
}
public int size() {
return data.size();
}
public LongArrayList data() {
return data;
}
public DateTimeColumn appendInternal(long dateTime) {
data.add(dateTime);
return this;
}
@Override
public String getString(int row) {
return printFormatter.format(getPackedDateTime(row));
}
@Override
public String getUnformattedString(int row) {
return PackedLocalDateTime.toString(getPackedDateTime(row));
}
@Override
public DateTimeColumn emptyCopy() {
return emptyCopy(DEFAULT_ARRAY_SIZE);
}
@Override
public DateTimeColumn emptyCopy(int rowSize) {
DateTimeColumn column = create(name(), rowSize);
column.setPrintFormatter(printFormatter);
return column;
}
@Override
public DateTimeColumn copy() {
DateTimeColumn column = emptyCopy(data.size());
column.data = data.clone();
return column;
}
@Override
public void clear() {
data.clear();
}
@Override
public void sortAscending() {
Arrays.parallelSort(data.elements());
}
@Override
public void sortDescending() {
LongArrays.parallelQuickSort(data.elements(), reverseLongComparator);
}
@Override
public Table summary() {
Table table = Table.create("Column: " + name());
StringColumn measure = StringColumn.create("Measure");
StringColumn value = StringColumn.create("Value");
table.addColumns(measure);
table.addColumns(value);
measure.append("Count");
value.append(String.valueOf(size()));
measure.append("Missing");
value.append(String.valueOf(countMissing()));
measure.append("Earliest");
value.append(String.valueOf(min()));
measure.append("Latest");
value.append(String.valueOf(max()));
return table;
}
@Override
public int countUnique() {
LongSet ints = new LongOpenHashSet(data.size());
for (long i : data) {
ints.add(i);
}
return ints.size();
}
@Override
public DateTimeColumn unique() {
LongSet ints = new LongOpenHashSet(data.size());
for (long i : data) {
ints.add(i);
}
DateTimeColumn column = emptyCopy(ints.size());
column.setName(name() + " Unique values");
column.data = LongArrayList.wrap(ints.toLongArray());
return column;
}
@Override
public boolean isEmpty() {
return data.isEmpty();
}
public long getLongInternal(int index) {
return data.getLong(index);
}
long getPackedDateTime(int index) {
return getLongInternal(index);
}
public LocalDateTime get(int index) {
return PackedLocalDateTime.asLocalDateTime(getPackedDateTime(index));
}
@Override
public IntComparator rowComparator() {
return comparator;
}
/**
* Conditionally update this column, replacing current values with newValue for all rows where the current value
* matches the selection criteria
*
* Example:
* myColumn.set(myColumn.valueIsMissing(), LocalDateTime.now()); // no more missing values
*/
public DateTimeColumn set(Selection rowSelection, LocalDateTime newValue) {
for (int row : rowSelection) {
set(row, newValue);
}
return this;
}
/**
* Returns the count of missing values in this column
*/
@Override
public int countMissing() {
int count = 0;
for (int i = 0; i < size(); i++) {
if (getPackedDateTime(i) == MISSING_VALUE) {
count++;
}
}
return count;
}
/**
* Returns an array where each entry is the difference, measured in seconds,
* between the LocalDateTime and midnight, January 1, 1970 UTC.
*/
public long[] asEpochSecondArray() {
return asEpochSecondArray(ZoneOffset.UTC);
}
public long[] asEpochSecondArray(ZoneOffset offset) {
long[] output = new long[data.size()];
for (int i = 0; i < data.size(); i++) {
output[i] = PackedLocalDateTime.asLocalDateTime(data.getLong(i)).toEpochSecond(offset);
}
return output;
}
/**
* Returns an array where each entry is the difference, measured in milliseconds,
* between the LocalDateTime and midnight, January 1, 1970 UTC.
*/
public long[] asEpochMillisArray() {
return asEpochMillisArray(ZoneOffset.UTC);
}
public long[] asEpochMillisArray(ZoneOffset offset) {
long[] output = new long[data.size()];
for (int i = 0; i < data.size(); i++) {
output[i] = PackedLocalDateTime.asLocalDateTime(data.getLong(i)).toInstant(offset).toEpochMilli();
}
return output;
}
@Override
public void append(Column column) {
Preconditions.checkArgument(column.type() == this.type());
DateTimeColumn doubleColumn = (DateTimeColumn) column;
for (int i = 0; i < doubleColumn.size(); i++) {
append(doubleColumn.get(i));
}
}
public LocalDateTime max() {
long max;
if (!isEmpty()) {
max = getPackedDateTime(0);
} else {
return null;
}
for (long aData : data) {
if (MISSING_VALUE != aData) {
max = (max > aData) ? max : aData;
}
}
if (MISSING_VALUE == max) {
return null;
}
return PackedLocalDateTime.asLocalDateTime(max);
}
@Override
public DateTimeColumn appendMissing() {
appendInternal(MISSING_VALUE);
return this;
}
public LocalDateTime min() {
long min;
if (!isEmpty()) {
min = getPackedDateTime(0);
} else {
return null;
}
for (long aData : data) {
if (MISSING_VALUE != aData) {
min = (min < aData) ? min : aData;
}
}
if (Integer.MIN_VALUE == min) {
return null;
}
return PackedLocalDateTime.asLocalDateTime(min);
}
public DateTimeColumn set(int index, long value) {
data.set(index, value);
return this;
}
public DateTimeColumn set(int index, LocalDateTime value) {
data.set(index, PackedLocalDateTime.pack(value));
return this;
}
/**
* Returns the largest ("top") n values in the column
*
* @param n The maximum number of records to return. The actual number will be smaller if n is greater than the
* number of observations in the column
* @return A list, possibly empty, of the largest observations
*/
public List top(int n) {
List top = new ArrayList<>();
long[] values = data.toLongArray();
LongArrays.parallelQuickSort(values, DescendingLongComparator.instance());
for (int i = 0; i < n && i < values.length; i++) {
top.add(PackedLocalDateTime.asLocalDateTime(values[i]));
}
return top;
}
/**
* Returns the smallest ("bottom") n values in the column
*
* @param n The maximum number of records to return. The actual number will be smaller if n is greater than the
* number of observations in the column
* @return A list, possibly empty, of the smallest n observations
*/
public List bottom(int n) {
List bottom = new ArrayList<>();
long[] values = data.toLongArray();
LongArrays.parallelQuickSort(values);
for (int i = 0; i < n && i < values.length; i++) {
bottom.add(PackedLocalDateTime.asLocalDateTime(values[i]));
}
return bottom;
}
public LongIterator longIterator() {
return data.iterator();
}
public Set asSet() {
Set times = new HashSet<>();
DateTimeColumn unique = unique();
for (LocalDateTime localDateTime : unique) {
times.add(localDateTime);
}
return times;
}
public int byteSize() {
return type().byteSize();
}
/**
* Returns the contents of the cell at rowNumber as a byte[]
*/
@Override
public byte[] asBytes(int rowNumber) {
return ByteBuffer.allocate(byteSize()).putLong(getPackedDateTime(rowNumber)).array();
}
@Override
public double getDouble(int i) {
return getPackedDateTime(i);
}
@Override
public double[] asDoubleArray() {
double[] doubles = new double[size()];
for (int i = 0; i < size(); i++) {
doubles[i] = data.getLong(i);
}
return doubles;
}
/**
* Returns an iterator over elements of type {@code T}.
*
* @return an Iterator.
*/
@Override
public Iterator iterator() {
return new Iterator() {
final LongIterator longIterator = longIterator();
@Override
public boolean hasNext() {
return longIterator.hasNext();
}
@Override
public LocalDateTime next() {
return PackedLocalDateTime.asLocalDateTime(longIterator.nextLong());
}
};
}
// fillWith methods
private DateTimeColumn fillWith(int count, Iterator iterator, Consumer acceptor) {
for (int r = 0; r < count; r++) {
if (!iterator.hasNext()) {
break;
}
acceptor.accept(iterator.next());
}
return this;
}
@Override
public DateTimeColumn fillWith(Iterator iterator) {
int[] r = new int[1];
fillWith(size(), iterator, date -> set(r[0]++, date));
return this;
}
private DateTimeColumn fillWith(int count, Iterable iterable, Consumer acceptor) {
Iterator iterator = null;
for (int r = 0; r < count; r++) {
if (iterator == null || (!iterator.hasNext())) {
iterator = iterable.iterator();
if (!iterator.hasNext()) {
break;
}
}
acceptor.accept(iterator.next());
}
return this;
}
@Override
public DateTimeColumn fillWith(Iterable iterable) {
int[] r = new int[1];
fillWith(size(), iterable, date -> set(r[0]++, date));
return this;
}
private DateTimeColumn fillWith(int count, Supplier supplier, Consumer acceptor) {
for (int r = 0; r < count; r++) {
try {
acceptor.accept(supplier.get());
} catch (Exception e) {
break;
}
}
return this;
}
@Override
public DateTimeColumn fillWith(Supplier supplier) {
int[] r = new int[1];
fillWith(size(), supplier, date -> set(r[0]++, date));
return this;
}
@Override
public Object[] asObjectArray() {
final LocalDateTime[] output = new LocalDateTime[data.size()];
for (int i = 0; i < data.size(); i++) {
output[i] = get(i);
}
return output;
}
}