config-model-api/src/main/java/com/yahoo/config/application/api/FileRegistry.java


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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.application.api;

import java.nio.ByteBuffer;
import java.util.List;
import java.util.Set;

import com.yahoo.config.FileReference;
import com.yahoo.text.Utf8;
import net.jpountz.xxhash.XXHashFactory;

/**
 * @author tonytv
 */
public interface FileRegistry {

    FileReference addFile(String relativePath);
    FileReference addUri(String uri);

    /**
     * Returns the name of the host which is the source of the files
     */
    String fileSourceHost();

    List<Entry> export();

    class Entry {
        public final String relativePath;
        public final FileReference reference;

        public Entry(String relativePath, FileReference reference) {
            this.relativePath = relativePath;
            this.reference = reference;
        }
    }

    static String uriToRelativeFile(String uri) {
        String relative = "uri/" + String.valueOf(XXHashFactory.nativeInstance().hash64().hash(ByteBuffer.wrap(Utf8.toBytes(uri)), 0));
        if (uri.endsWith(".json")) {
            relative += ".json";
        } else if (uri.endsWith(".json.lz4")) {
            relative += ".json.lz4";
        } else if (uri.endsWith(".lz4")) {
            relative += ".lz4";
        }
        return relative;
    }

}