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/*
 * 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.common.lucene;

import org.apache.lucene.store.Directory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.NoSuchFileException;

/**
 * A set of utilities for Lucene {@link Directory}.
 *
 *
 */
public class Directories {

    /**
     * Returns the estimated size of a {@link Directory}.
     */
    public static long estimateSize(Directory directory) throws IOException {
        long estimatedSize = 0;
        String[] files = directory.listAll();
        for (String file : files) {
            try {
                estimatedSize += directory.fileLength(file);
            } catch (NoSuchFileException | FileNotFoundException e) {
                // ignore, the file is not there no more
            }
        }
        return estimatedSize;
    }

    private Directories() {

    }
}