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A table format for huge analytic datasets
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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 org.apache.iceberg.io.FileIO;
import org.apache.iceberg.io.LocationProvider;

/**
 * TableOperations implementation that provides access to metadata for a Table at some point in
 * time, using a table metadata location. It will never refer to a different Metadata object than
 * the one it was created with and cannot be used to create or delete files.
 */
public class StaticTableOperations implements TableOperations {
  private TableMetadata staticMetadata;
  private final String metadataFileLocation;
  private final FileIO io;
  private final LocationProvider locationProvider;

  /** Creates a StaticTableOperations tied to a specific static version of the TableMetadata */
  public StaticTableOperations(String metadataFileLocation, FileIO io) {
    this(metadataFileLocation, io, null);
  }

  public StaticTableOperations(
      String metadataFileLocation, FileIO io, LocationProvider locationProvider) {
    this.io = io;
    this.metadataFileLocation = metadataFileLocation;
    this.locationProvider = locationProvider;
  }

  public StaticTableOperations(TableMetadata staticMetadata, FileIO io) {
    this(staticMetadata, io, null);
  }

  public StaticTableOperations(
      TableMetadata staticMetadata, FileIO io, LocationProvider locationProvider) {
    this.staticMetadata = staticMetadata;
    this.metadataFileLocation = staticMetadata.metadataFileLocation();
    this.io = io;
    this.locationProvider = locationProvider;
  }

  @Override
  public TableMetadata current() {
    if (staticMetadata == null) {
      staticMetadata = TableMetadataParser.read(io, metadataFileLocation);
    }
    return staticMetadata;
  }

  /**
   * StaticTableOperations works on the same version of TableMetadata, and it will never refer a
   * different TableMetadata object than the one it was created with.
   *
   * @return always {@link #current()}.
   */
  @Override
  public TableMetadata refresh() {
    return current();
  }

  @Override
  public void commit(TableMetadata base, TableMetadata metadata) {
    throw new UnsupportedOperationException("Cannot modify a static table");
  }

  @Override
  public FileIO io() {
    return this.io;
  }

  @Override
  public String metadataFileLocation(String fileName) {
    throw new UnsupportedOperationException("Cannot modify a static table");
  }

  @Override
  public LocationProvider locationProvider() {
    return locationProvider;
  }
}