/*
* 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.test;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.FieldFilterLeafReader;
import org.apache.lucene.index.FilterDirectoryReader;
import org.apache.lucene.index.FilterLeafReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.IndexReader.CacheHelper;
import java.io.IOException;
import java.util.Collections;
public class FieldMaskingReader extends FilterDirectoryReader {
private final String field;
public FieldMaskingReader(String field, DirectoryReader in) throws IOException {
super(in, new FilterDirectoryReader.SubReaderWrapper() {
@Override
public LeafReader wrap(LeafReader reader) {
return new FilterLeafReader(new FieldFilterLeafReader(reader, Collections.singleton(field), true)) {
// FieldFilterLeafReader does not forward cache helpers
// since it considers it is illegal because of the fact
// that it changes the content of the index. However we
// want this behavior for tests, and security plugins
// are careful to only use the cache when it's valid
@Override
public CacheHelper getReaderCacheHelper() {
return reader.getReaderCacheHelper();
}
@Override
public CacheHelper getCoreCacheHelper() {
return reader.getCoreCacheHelper();
}
};
}
});
this.field = field;
}
@Override
protected DirectoryReader doWrapDirectoryReader(DirectoryReader in) throws IOException {
return new FieldMaskingReader(field, in);
}
@Override
public CacheHelper getReaderCacheHelper() {
return in.getReaderCacheHelper();
}
}