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109 lines (95 loc) · 3.23 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.iceberg;
import java.io.Serializable;
import java.util.Objects;
import org.apache.iceberg.transforms.Transform;
/** A field in a {@link SortOrder}. */
public class SortField implements Serializable {
private final Transform<?, ?> transform;
private final int sourceId;
private final SortDirection direction;
private final NullOrder nullOrder;
SortField(Transform<?, ?> transform, int sourceId, SortDirection direction, NullOrder nullOrder) {
this.transform = transform;
this.sourceId = sourceId;
this.direction = direction;
this.nullOrder = nullOrder;
}
/**
* Returns the transform used to produce sort values from source values.
*
* @param <S> the Java type of values transformed by the transform function
* @param <T> the Java type of values returned by the transform function
* @return the transform
*/
@SuppressWarnings("unchecked")
public <S, T> Transform<S, T> transform() {
return (Transform<S, T>) transform;
}
/** Returns the field id of the source field in the {@link SortOrder sort order's} table schema */
public int sourceId() {
return sourceId;
}
/** Returns the sort direction */
public SortDirection direction() {
return direction;
}
/** Returns the null order */
public NullOrder nullOrder() {
return nullOrder;
}
/**
* Checks whether this field's order satisfies another field's order.
*
* @param other another sort field
* @return true if this order satisfies the given order
*/
public boolean satisfies(SortField other) {
if (Objects.equals(this, other)) {
return true;
} else if (sourceId != other.sourceId
|| direction != other.direction
|| nullOrder != other.nullOrder) {
return false;
}
return transform.satisfiesOrderOf(other.transform);
}
@Override
public String toString() {
return transform + "(" + sourceId + ") " + direction + " " + nullOrder;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
} else if (other == null || getClass() != other.getClass()) {
return false;
}
SortField that = (SortField) other;
return transform.toString().equals(that.transform.toString())
&& sourceId == that.sourceId
&& direction == that.direction
&& nullOrder == that.nullOrder;
}
@Override
public int hashCode() {
return Objects.hash(transform, sourceId, direction, nullOrder);
}
}