hbase-client/src/main/java/org/apache/hadoop/hbase/client/Delete.java

/*
 *
 * 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.hadoop.hbase.client;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.UUID;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.security.visibility.CellVisibility;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Used to perform Delete operations on a single row.
 * <p>
 * To delete an entire row, instantiate a Delete object with the row
 * to delete.  To further define the scope of what to delete, perform
 * additional methods as outlined below.
 * <p>
 * To delete specific families, execute {@link #addFamily(byte[]) deleteFamily}
 * for each family to delete.
 * <p>
 * To delete multiple versions of specific columns, execute
 * {@link #addColumns(byte[], byte[]) deleteColumns}
 * for each column to delete.
 * <p>
 * To delete specific versions of specific columns, execute
 * {@link #addColumn(byte[], byte[], long) deleteColumn}
 * for each column version to delete.
 * <p>
 * Specifying timestamps, deleteFamily and deleteColumns will delete all
 * versions with a timestamp less than or equal to that passed.  If no
 * timestamp is specified, an entry is added with a timestamp of 'now'
 * where 'now' is the servers's System.currentTimeMillis().
 * Specifying a timestamp to the deleteColumn method will
 * delete versions only with a timestamp equal to that specified.
 * If no timestamp is passed to deleteColumn, internally, it figures the
 * most recent cell's timestamp and adds a delete at that timestamp; i.e.
 * it deletes the most recently added cell.
 * <p>The timestamp passed to the constructor is used ONLY for delete of
 * rows.  For anything less -- a deleteColumn, deleteColumns or
 * deleteFamily -- then you need to use the method overrides that take a
 * timestamp.  The constructor timestamp is not referenced.
 */
@InterfaceAudience.Public
public class Delete extends Mutation {
  /**
   * Create a Delete operation for the specified row.
   * <p>
   * If no further operations are done, this will delete everything
   * associated with the specified row (all versions of all columns in all
   * families), with timestamp from current point in time to the past.
   * Cells defining timestamp for a future point in time
   * (timestamp > current time) will not be deleted.
   * @param row row key
   */
  public Delete(byte [] row) {
    this(row, HConstants.LATEST_TIMESTAMP);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.<p>
   *
   * If no further operations are done, this will delete all columns in all
   * families of the specified row with a timestamp less than or equal to the
   * specified timestamp.<p>
   *
   * This timestamp is ONLY used for a delete row operation.  If specifying
   * families or columns, you must specify each timestamp individually.
   * @param row row key
   * @param timestamp maximum version timestamp (only for delete row)
   */
  public Delete(byte [] row, long timestamp) {
    this(row, 0, row.length, timestamp);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.<p>
   *
   * If no further operations are done, this will delete all columns in all
   * families of the specified row with a timestamp less than or equal to the
   * specified timestamp.<p>
   *
   * This timestamp is ONLY used for a delete row operation.  If specifying
   * families or columns, you must specify each timestamp individually.
   * @param row We make a local copy of this passed in row.
   * @param rowOffset
   * @param rowLength
   */
  public Delete(final byte[] row, final int rowOffset, final int rowLength) {
    this(row, rowOffset, rowLength, HConstants.LATEST_TIMESTAMP);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.<p>
   *
   * If no further operations are done, this will delete all columns in all
   * families of the specified row with a timestamp less than or equal to the
   * specified timestamp.<p>
   *
   * This timestamp is ONLY used for a delete row operation.  If specifying
   * families or columns, you must specify each timestamp individually.
   * @param row We make a local copy of this passed in row.
   * @param rowOffset
   * @param rowLength
   * @param timestamp maximum version timestamp (only for delete row)
   */
  public Delete(final byte[] row, final int rowOffset, final int rowLength, long timestamp) {
    checkRow(row, rowOffset, rowLength);
    this.row = Bytes.copy(row, rowOffset, rowLength);
    setTimestamp(timestamp);
  }

  /**
   * @param deleteToCopy delete to copy
   */
  public Delete(final Delete deleteToCopy) {
    super(deleteToCopy);
  }

  /**
   * Construct the Delete with user defined data. NOTED:
   * 1) all cells in the familyMap must have the delete type.
   * see {@link org.apache.hadoop.hbase.Cell.Type}
   * 2) the row of each cell must be same with passed row.
   * @param row row. CAN'T be null
   * @param ts timestamp
   * @param familyMap the map to collect all cells internally. CAN'T be null
   */
  public Delete(byte[] row, long ts, NavigableMap<byte [], List<Cell>> familyMap) {
    super(row, ts, familyMap);
  }

  /**
   * Add an existing delete marker to this Delete object.
   * @param cell An existing cell of type "delete".
   * @return this for invocation chaining
   * @throws IOException
   */
  public Delete add(Cell cell) throws IOException {
    super.add(cell);
    return this;
  }

  /**
   * Delete all versions of all columns of the specified family.
   * <p>
   * Overrides previous calls to deleteColumn and deleteColumns for the
   * specified family.
   * @param family family name
   * @return this for invocation chaining
   */
  public Delete addFamily(final byte [] family) {
    this.addFamily(family, this.ts);
    return this;
  }

  /**
   * Delete all columns of the specified family with a timestamp less than
   * or equal to the specified timestamp.
   * <p>
   * Overrides previous calls to deleteColumn and deleteColumns for the
   * specified family.
   * @param family family name
   * @param timestamp maximum version timestamp
   * @return this for invocation chaining
   */
  public Delete addFamily(final byte [] family, final long timestamp) {
    if (timestamp < 0) {
      throw new IllegalArgumentException("Timestamp cannot be negative. ts=" + timestamp);
    }
    List<Cell> list = getCellList(family);
    if(!list.isEmpty()) {
      list.clear();
    }
    KeyValue kv = new KeyValue(row, family, null, timestamp, KeyValue.Type.DeleteFamily);
    list.add(kv);
    return this;
  }

  /**
   * Delete all columns of the specified family with a timestamp equal to
   * the specified timestamp.
   * @param family family name
   * @param timestamp version timestamp
   * @return this for invocation chaining
   */
  public Delete addFamilyVersion(final byte [] family, final long timestamp) {
    List<Cell> list = getCellList(family);
    list.add(new KeyValue(row, family, null, timestamp,
          KeyValue.Type.DeleteFamilyVersion));
    return this;
  }

  /**
   * Delete all versions of the specified column.
   * @param family family name
   * @param qualifier column qualifier
   * @return this for invocation chaining
   */
  public Delete addColumns(final byte [] family, final byte [] qualifier) {
    addColumns(family, qualifier, this.ts);
    return this;
  }

  /**
   * Delete all versions of the specified column with a timestamp less than
   * or equal to the specified timestamp.
   * @param family family name
   * @param qualifier column qualifier
   * @param timestamp maximum version timestamp
   * @return this for invocation chaining
   */
  public Delete addColumns(final byte [] family, final byte [] qualifier, final long timestamp) {
    if (timestamp < 0) {
      throw new IllegalArgumentException("Timestamp cannot be negative. ts=" + timestamp);
    }
    List<Cell> list = getCellList(family);
    list.add(new KeyValue(this.row, family, qualifier, timestamp,
        KeyValue.Type.DeleteColumn));
    return this;
  }

  /**
   * Delete the latest version of the specified column.
   * This is an expensive call in that on the server-side, it first does a
   * get to find the latest versions timestamp.  Then it adds a delete using
   * the fetched cells timestamp.
   * @param family family name
   * @param qualifier column qualifier
   * @return this for invocation chaining
   */
  public Delete addColumn(final byte [] family, final byte [] qualifier) {
    this.addColumn(family, qualifier, this.ts);
    return this;
  }

  /**
   * Delete the specified version of the specified column.
   * @param family family name
   * @param qualifier column qualifier
   * @param timestamp version timestamp
   * @return this for invocation chaining
   */
  public Delete addColumn(byte [] family, byte [] qualifier, long timestamp) {
    if (timestamp < 0) {
      throw new IllegalArgumentException("Timestamp cannot be negative. ts=" + timestamp);
    }
    List<Cell> list = getCellList(family);
    KeyValue kv = new KeyValue(this.row, family, qualifier, timestamp, KeyValue.Type.Delete);
    list.add(kv);
    return this;
  }

  @Override
  public Delete setTimestamp(long timestamp) {
    super.setTimestamp(timestamp);
    return this;
  }

  @Override
  public Delete setAttribute(String name, byte[] value) {
    return (Delete) super.setAttribute(name, value);
  }

  @Override
  public Delete setId(String id) {
    return (Delete) super.setId(id);
  }

  @Override
  public Delete setDurability(Durability d) {
    return (Delete) super.setDurability(d);
  }

  @Override
  public Delete setClusterIds(List<UUID> clusterIds) {
    return (Delete) super.setClusterIds(clusterIds);
  }

  @Override
  public Delete setCellVisibility(CellVisibility expression) {
    return (Delete) super.setCellVisibility(expression);
  }

  @Override
  public Delete setACL(String user, Permission perms) {
    return (Delete) super.setACL(user, perms);
  }

  @Override
  public Delete setACL(Map<String, Permission> perms) {
    return (Delete) super.setACL(perms);
  }

  @Override
  public Delete setTTL(long ttl) {
    throw new UnsupportedOperationException("Setting TTLs on Deletes is not supported");
  }

  @Override
  public Delete setPriority(int priority) {
    return (Delete) super.setPriority(priority);
  }
}