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Copy pathSortKey.java
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56 lines (50 loc) · 1.79 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.util.List;
import java.util.stream.Collectors;
/**
* A struct of flattened sort field values.
*
* <p>Instances of this class can produce sort values from a row passed to {@link
* #wrap(StructLike)}.
*/
public class SortKey extends StructTransform {
private final Schema schema;
private final SortOrder sortOrder;
public SortKey(Schema schema, SortOrder sortOrder) {
super(schema, fieldTransform(sortOrder));
this.schema = schema;
this.sortOrder = sortOrder;
}
private SortKey(SortKey toCopy) {
// only need deep copy inside StructTransform
super(toCopy);
this.schema = toCopy.schema;
this.sortOrder = toCopy.sortOrder;
}
public SortKey copy() {
return new SortKey(this);
}
private static List<FieldTransform> fieldTransform(SortOrder sortOrder) {
return sortOrder.fields().stream()
.map(sortField -> new FieldTransform(sortField.sourceId(), sortField.transform()))
.collect(Collectors.toList());
}
}