content: /*
   * 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.beam.sdk.testutils.jvmverification;
  
  import static org.apache.beam.sdk.testutils.jvmverification.JvmVerification.Java.v11;
  import static org.apache.beam.sdk.testutils.jvmverification.JvmVerification.Java.v17;
  import static org.apache.beam.sdk.testutils.jvmverification.JvmVerification.Java.v1_8;
  import static org.apache.beam.sdk.testutils.jvmverification.JvmVerification.Java.v21;
  import static org.apache.beam.sdk.testutils.jvmverification.JvmVerification.Java.v25;
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.beam.repackaged.core.org.apache.commons.compress.utils.IOUtils;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.commons.codec.binary.Hex;
  import org.junit.Test;
  
  public class JvmVerification {
  
    private static final Map<String, Java> versionMapping = new HashMap<>();
  
    static {
      versionMapping.put("0034", v1_8);
      versionMapping.put("0037", v11);
      versionMapping.put("003d", v17);
      versionMapping.put("0041", v21);
      versionMapping.put("0045", v25);
    }
  
    // bytecode
    @Test
    public void verifyCodeIsCompiledWithJava8() throws IOException {
      assertEquals(v1_8, getByteCodeVersion(DoFn.class));
    }
  
    @Test
    public void verifyTestCodeIsCompiledWithJava8() throws IOException {
      assertEquals(v1_8, getByteCodeVersion(JvmVerification.class));
    }
  
    @Test
    public void verifyTestCodeIsCompiledWithJava11() throws IOException {
      assertEquals(v11, getByteCodeVersion(JvmVerification.class));
    }
  
    @Test
    public void verifyTestCodeIsCompiledWithJava17() throws IOException {
      assertEquals(v17, getByteCodeVersion(JvmVerification.class));
    }
  
    @Test
    public void verifyTestCodeIsCompiledWithJava21() throws IOException {
      assertEquals(v21, getByteCodeVersion(JvmVerification.class));
    }
  
    @Test
    public void verifyTestCodeIsCompiledWithJava25() throws IOException {
      assertEquals(v25, getByteCodeVersion(JvmVerification.class));
    }
  
    // jvm
    @Test
    public void verifyRunningJVMVersionIs8() {
      final String version = getJavaSpecification();
      assertEquals(v1_8.name, version);
    }
  
    @Test
    public void verifyRunningJVMVersionIs11() {
      final String version = getJavaSpecification();
      assertEquals(v11.name, version);
    }
  
    @Test
    public void verifyRunningJVMVersionIs17() {
      final String version = getJavaSpecification();
      assertEquals(v17.name, version);
    }
  
    @Test
    public void verifyRunningJVMVersionIs21() {
      final String version = getJavaSpecification();
      assertEquals(v21.name, version);
    }
  
    @Test
    public void verifyRunningJVMVersionIs25() {
      final String version = getJavaSpecification();
      assertEquals(v25.name, version);
    }
  
    private static <T> Java getByteCodeVersion(final Class<T> clazz) throws IOException {
      final InputStream stream =
          clazz.getClassLoader().getResourceAsStream(clazz.getName().replace(".", "/") + ".class");
      final byte[] classBytes = IOUtils.toByteArray(stream);
      final String versionInHexString =
          Hex.encodeHexString(new byte[] {classBytes[6], classBytes[7]});
      return versionMapping.get(versionInHexString);
    }
  
    private static String getJavaSpecification() {
      return System.getProperty("java.specification.version");
    }
  
    enum Java {
      v1_8("1.8"),
      v11("11"),
      v17("17"),
      v21("21"),
      v25("25");
  
      final String name;
  
      Java(final String name) {
        this.name = name;
      }
    }
  }
  