/*
* Copyright © 2016 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.data2.metadata.indexer;
import co.cask.cdap.data2.metadata.dataset.MetadataDataset;
import co.cask.cdap.data2.metadata.dataset.MetadataEntry;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;
/**
* Default {@link Indexer} for {@link MetadataEntry}
*/
public class DefaultValueIndexer implements Indexer {
private static final Pattern VALUE_SPLIT_PATTERN = Pattern.compile("[-_:,\\s]+");
private static final Pattern TAGS_SEPARATOR_PATTERN = Pattern.compile("[,\\s]+");
@Override
public Set<String> getIndexes(MetadataEntry entry) {
Set<String> valueIndexes = new HashSet<>();
if (entry.getKey().equalsIgnoreCase(MetadataDataset.TAGS_KEY)) {
// if the entry is tag then each tag is an index
valueIndexes.addAll(Arrays.asList(TAGS_SEPARATOR_PATTERN.split(entry.getValue())));
} else {
// for key value the complete value is an index
valueIndexes.add(entry.getValue());
}
Set<String> indexes = new HashSet<>();
for (String index : valueIndexes) {
// split all value indexes on the VALUE_SPLIT_PATTERN
indexes.addAll(Arrays.asList(VALUE_SPLIT_PATTERN.split(index)));
}
// add all value indexes too
indexes.addAll(valueIndexes);
return indexes;
}
}