/*
 * 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.LeafReader;

import java.io.IOException;
import java.util.Collections;

public class FieldMaskingReader extends FilterDirectoryReader {
    private final String field;
    public FieldMaskingReader(final String field, DirectoryReader in) throws IOException {
        super(in, new FilterDirectoryReader.SubReaderWrapper() {
            @Override
            public LeafReader wrap(LeafReader reader) {
                return new FieldFilterLeafReader(reader, Collections.singleton(field), true);
            }
        });
        this.field = field;

    }

    @Override
    protected DirectoryReader doWrapDirectoryReader(DirectoryReader in) throws IOException {
        return new FieldMaskingReader(field, in);
    }

    @Override
    public Object getCoreCacheKey() {
        return in.getCoreCacheKey();
    }
}