src/main/java/org/apache/cassandra/sidecar/utils/SidecarVersionProvider.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.cassandra.sidecar.utils;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

/**
 * Retrieves, caches, and provides build version of this Sidecar binary
 */
public class SidecarVersionProvider
{
    private final String sidecarVersion;

    public SidecarVersionProvider(String resource)
    {
        try (InputStream input = getClass().getResourceAsStream(resource);
             ByteArrayOutputStream output = new ByteArrayOutputStream())
        {
            byte[] buffer = new byte[32];
            int length;
            while ((length = input.read(buffer)) >= 0)
            {
                output.write(buffer, 0, length);
            }
            sidecarVersion = output.toString(StandardCharsets.UTF_8.name());
        }
        catch (Exception exception)
        {
            throw new IllegalStateException("Failed to retrieve Sidecar version from resource " + resource, exception);
        }
    }

    public String sidecarVersion()
    {
        return sidecarVersion;
    }
}