DomGarguilo commented on code in PR #4160: URL: https://github.com/apache/accumulo/pull/4160#discussion_r1459089568
########## core/src/main/java/org/apache/accumulo/core/fate/accumulo/StatusMappingIterator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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 + * + * https://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.accumulo.core.fate.accumulo; + +import static org.apache.accumulo.core.fate.accumulo.schema.FateSchema.TxColumnFamily.STATUS_COLUMN; + +import java.io.IOException; +import java.util.Arrays; +import java.util.Collection; +import java.util.HashSet; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +import org.apache.accumulo.core.client.IteratorSetting; +import org.apache.accumulo.core.data.ByteSequence; +import org.apache.accumulo.core.data.Condition; +import org.apache.accumulo.core.data.Key; +import org.apache.accumulo.core.data.Range; +import org.apache.accumulo.core.data.Value; +import org.apache.accumulo.core.fate.ReadOnlyFateStore; +import org.apache.accumulo.core.iterators.IteratorEnvironment; +import org.apache.accumulo.core.iterators.SortedKeyValueIterator; + +public class StatusMappingIterator implements SortedKeyValueIterator<Key,Value> { + + private static final String PRESENT = "present"; + private static final String ABSENT = "absent"; + private static final String STATUS_SET_KEY = "statusSet"; + + private static final Condition CONDITION = + new Condition(STATUS_COLUMN.getColumnFamily(), STATUS_COLUMN.getColumnQualifier()); + + private SortedKeyValueIterator<Key,Value> source; + private final Set<String> acceptableStatuses = new HashSet<>(); + private Value mappedValue; + + @Override + public void init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, + IteratorEnvironment env) throws IOException { + this.source = source; + if (options.containsKey(STATUS_SET_KEY)) { + String[] statuses = decodeStatuses(options.get(STATUS_SET_KEY)); + acceptableStatuses.addAll(Arrays.asList(statuses)); + } + } + + @Override + public boolean hasTop() { + return source.hasTop(); + } + + @Override + public void next() throws IOException { + source.next(); + mapValue(); + } + + @Override + public void seek(Range range, Collection<ByteSequence> columnFamilies, boolean inclusive) + throws IOException { + source.seek(range, columnFamilies, inclusive); + mapValue(); + } + + private void mapValue() { + if (source.hasTop()) { + String currentValue = source.getTopValue().toString(); + mappedValue = + acceptableStatuses.contains(currentValue) ? new Value(PRESENT) : new Value(ABSENT); + } + } + + @Override + public Key getTopKey() { + return source.getTopKey(); + } + + @Override + public Value getTopValue() { + return mappedValue; + } + + @Override + public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env) { + throw new UnsupportedOperationException(); + } + + /** + * Creates a condition that checks if the status column's value is one of the given acceptable + * statuses. + * + * @param statuses The acceptable statuses. + * @return A condition configured to use this iterator. + */ + public static Condition createCondition(ReadOnlyFateStore.TStatus... statuses) { + if (statuses.length == 0) { + // If no statuses are provided, require the status column to be absent. Return the condition + // with no value. + return CONDITION; + } else { + IteratorSetting is = new IteratorSetting(100, StatusMappingIterator.class); + is.addOption(STATUS_SET_KEY, encodeStatuses(statuses)); + + // The iterator will map the status to "present" if it's in the acceptable set + return CONDITION.setValue(PRESENT).setIterators(is); Review Comment: Whoops, that was the issue. Thanks. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
