/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.snapshots;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.index.IndexNotFoundException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Snapshot utilities
*/
public class SnapshotUtils {
/**
* Filters out list of available indices based on the list of selected indices.
*
* @param availableIndices list of available indices
* @param selectedIndices list of selected indices
* @param indicesOptions ignore indices flag
* @return filtered out indices
*/
public static List<String> filterIndices(List<String> availableIndices, String[] selectedIndices, IndicesOptions indicesOptions) {
if (IndexNameExpressionResolver.isAllIndices(Arrays.asList(selectedIndices))) {
return availableIndices;
}
Set<String> result = null;
for (int i = 0; i < selectedIndices.length; i++) {
String indexOrPattern = selectedIndices[i];
boolean add = true;
if (!indexOrPattern.isEmpty()) {
if (availableIndices.contains(indexOrPattern)) {
if (result == null) {
result = new HashSet<>();
}
result.add(indexOrPattern);
continue;
}
if (indexOrPattern.charAt(0) == '+') {
add = true;
indexOrPattern = indexOrPattern.substring(1);
// if its the first, add empty set
if (i == 0) {
result = new HashSet<>();
}
} else if (indexOrPattern.charAt(0) == '-') {
// if its the first, fill it with all the indices...
if (i == 0) {
result = new HashSet<>(availableIndices);
}
add = false;
indexOrPattern = indexOrPattern.substring(1);
}
}
if (indexOrPattern.isEmpty() || !Regex.isSimpleMatchPattern(indexOrPattern)) {
if (!availableIndices.contains(indexOrPattern)) {
if (!indicesOptions.ignoreUnavailable()) {
throw new IndexNotFoundException(indexOrPattern);
} else {
if (result == null) {
// add all the previous ones...
result = new HashSet<>(availableIndices.subList(0, i));
}
}
} else {
if (result != null) {
if (add) {
result.add(indexOrPattern);
} else {
result.remove(indexOrPattern);
}
}
}
continue;
}
if (result == null) {
// add all the previous ones...
result = new HashSet<>(availableIndices.subList(0, i));
}
boolean found = false;
for (String index : availableIndices) {
if (Regex.simpleMatch(indexOrPattern, index)) {
found = true;
if (add) {
result.add(index);
} else {
result.remove(index);
}
}
}
if (!found && !indicesOptions.allowNoIndices()) {
throw new IndexNotFoundException(indexOrPattern);
}
}
if (result == null) {
return Collections.unmodifiableList(new ArrayList<>(Arrays.asList(selectedIndices)));
}
return Collections.unmodifiableList(new ArrayList<>(result));
}
}