| /** |
| * |
| * 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.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.TreeMap; |
| import java.util.TreeSet; |
| |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| import org.apache.hbase.thirdparty.com.google.common.base.Preconditions; |
| |
| @InterfaceAudience.Public |
| public final class TableDescriptorUtils { |
| public final static class TableDescriptorDelta { |
| private final Set<byte[]> columnsAdded; |
| private final Set<byte[]> columnsDeleted; |
| private final Set<byte[]> columnsModified; |
| |
| private TableDescriptorDelta(TableDescriptor oldTD, TableDescriptor newTD) { |
| Preconditions.checkNotNull(oldTD); |
| Preconditions.checkNotNull(newTD); |
| |
| Map<byte[], ColumnFamilyDescriptor> oldCFs = new TreeMap<>(Bytes.BYTES_COMPARATOR); |
| Set<byte[]> newCFs = new TreeSet<>(Bytes.BYTES_COMPARATOR); |
| |
| // CFD -> (name, CFD) |
| for (ColumnFamilyDescriptor cfd : oldTD.getColumnFamilies()) { |
| oldCFs.put(cfd.getName(), cfd); |
| } |
| |
| Set<byte[]> added = new TreeSet<>(Bytes.BYTES_COMPARATOR); |
| Set<byte[]> modified = new TreeSet<>(Bytes.BYTES_COMPARATOR); |
| |
| for (ColumnFamilyDescriptor cfd : newTD.getColumnFamilies()) { |
| byte[] cfName = cfd.getName(); |
| newCFs.add(cfName); |
| |
| if (!oldCFs.containsKey(cfName)) { |
| // If column family is in newTD but not oldTD, then it was added |
| added.add(cfName); |
| } else if (!cfd.equals(oldCFs.get(cfName))) { |
| // If column family is in both, but not equal, then it was modified |
| modified.add(cfName); |
| } |
| } |
| |
| // If column family is in oldTD, but not in newTD, then it got deleted. |
| Set<byte[]> deleted = oldCFs.keySet(); |
| deleted.removeAll(newCFs); |
| |
| columnsAdded = Collections.unmodifiableSet(added); |
| columnsDeleted = Collections.unmodifiableSet(deleted); |
| columnsModified = Collections.unmodifiableSet(modified); |
| } |
| |
| public Set<byte[]> getColumnsAdded() { |
| return columnsAdded; |
| } |
| |
| public Set<byte[]> getColumnsDeleted() { |
| return columnsDeleted; |
| } |
| |
| public Set<byte[]> getColumnsModified() { |
| return columnsModified; |
| } |
| } |
| |
| private TableDescriptorUtils() { } |
| |
| /** |
| * Compares two {@link TableDescriptor} and indicate which columns were added, deleted, |
| * or modified from oldTD to newTD |
| * @return a TableDescriptorDelta that contains the added/deleted/modified column names |
| */ |
| public static TableDescriptorDelta computeDelta(TableDescriptor oldTD, TableDescriptor newTD) { |
| return new TableDescriptorDelta(oldTD, newTD); |
| } |
| } |