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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;
/** A scan task. */
public interface ScanTask extends Serializable {
/**
* The number of bytes that should be read by this scan task.
*
* @return the total number of bytes to read
*/
default long sizeBytes() {
return 4 * 1024 * 1024; // 4 MB
}
/**
* The estimated number of rows produced by this scan task.
*
* @return the estimated number of produced rows
*/
default long estimatedRowsCount() {
return 100_000;
}
/**
* The number of files that will be opened by this scan task.
*
* @return the number of files to open
*/
default int filesCount() {
return 1;
}
/** Returns true if this is a {@link FileScanTask}, false otherwise. */
default boolean isFileScanTask() {
return false;
}
/**
* Returns this cast to {@link FileScanTask} if it is one
*
* @return this cast to {@link FileScanTask} if it is one
* @throws IllegalStateException if this is not a {@link FileScanTask}
*/
default FileScanTask asFileScanTask() {
throw new IllegalStateException("Not a FileScanTask: " + this);
}
/** Returns true if this is a {@link DataTask}, false otherwise. */
default boolean isDataTask() {
return false;
}
/**
* Returns this cast to {@link DataTask} if it is one
*
* @return this cast to {@link DataTask} if it is one
* @throws IllegalStateException if this is not a {@link DataTask}
*/
default DataTask asDataTask() {
throw new IllegalStateException("Not a DataTask: " + this);
}
/**
* Returns this cast to {@link CombinedScanTask} if it is one
*
* @return this cast to {@link CombinedScanTask} if it is one
* @throws IllegalStateException if this is not a {@link CombinedScanTask}
*/
default CombinedScanTask asCombinedScanTask() {
throw new IllegalStateException("Not a CombinedScanTask: " + this);
}
}