/*
* 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 com.facebook.presto.spi;
import com.facebook.presto.spi.block.SortOrder;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import java.util.Collections;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import static java.util.Objects.requireNonNull;
public final class SortingProperty<E>
implements LocalProperty<E>
{
private final E column;
private final SortOrder order;
@JsonCreator
public SortingProperty(
@JsonProperty("column") E column,
@JsonProperty("order") SortOrder order)
{
requireNonNull(column, "column is null");
requireNonNull(order, "order is null");
this.column = column;
this.order = order;
}
@JsonProperty
public E getColumn()
{
return column;
}
public Set<E> getColumns()
{
return Collections.singleton(column);
}
@JsonProperty
public SortOrder getOrder()
{
return order;
}
/**
* Returns Optional.empty() if the column could not be translated
*/
@Override
public <T> Optional<LocalProperty<T>> translate(Function<E, Optional<T>> translator)
{
Optional<T> translated = translator.apply(column);
if (translated.isPresent()) {
return Optional.of(new SortingProperty<>(translated.get(), order));
}
return Optional.empty();
}
@Override
public boolean isSimplifiedBy(LocalProperty<E> known)
{
return known instanceof ConstantProperty || known.equals(this);
}
@Override
public String toString()
{
String ordering = "";
String nullOrdering = "";
switch (order) {
case ASC_NULLS_FIRST:
ordering = "\u2191";
nullOrdering = "\u2190";
break;
case ASC_NULLS_LAST:
ordering = "\u2191";
nullOrdering = "\u2192";
break;
case DESC_NULLS_FIRST:
ordering = "\u2193";
nullOrdering = "\u2190";
break;
case DESC_NULLS_LAST:
ordering = "\u2193";
nullOrdering = "\u2192";
break;
}
return "S" + ordering + nullOrdering + "(" + column + ")";
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
SortingProperty<?> that = (SortingProperty<?>) o;
return Objects.equals(column, that.column) &&
Objects.equals(order, that.order);
}
@Override
public int hashCode()
{
return Objects.hash(column, order);
}
}