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.coders;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Modifier;
  import java.util.List;
  import org.apache.beam.sdk.util.CoderUtils;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Joiner;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  
  /**
   * A command-line utility for printing the base-64 encodings of test values, for generating exact
   * wire format tests.
   *
   * <p>For internal use only.
   *
   * <p>Example invocation via maven: {@code mvn test-compile exec:java \ -Dexec.classpathScope=test \
   * -Dexec.mainClass=org.apache.beam.sdk.coders.PrintBase64Encodings
   * -Dexec.args='org.apache.beam.sdk.coders.BigEndianIntegerCoderTest.TEST_CODER \
   * org.apache.beam.sdk.coders.BigEndianIntegerCoderTest.TEST_VALUES' }
   */
  public class PrintBase64Encodings {
  
    /** Gets a field even if it is private, which the test data generally will be. */
    private static Field getField(Class<?> clazz, String fieldName) throws Exception {
      for (Field field : clazz.getDeclaredFields()) {
        if (field.getName().equals(fieldName)) {
          if (!Modifier.isPublic(field.getModifiers())) {
            field.setAccessible(true);
          }
          return field;
        }
      }
      throw new NoSuchFieldException(clazz.getCanonicalName() + "." + fieldName);
    }
  
    private static Object getFullyQualifiedValue(String fullyQualifiedName) throws Exception {
      int lastDot = fullyQualifiedName.lastIndexOf(".");
      String className = fullyQualifiedName.substring(0, lastDot);
      String fieldName = fullyQualifiedName.substring(lastDot + 1);
  
      Class<?> clazz = Class.forName(className);
      Field field = getField(clazz, fieldName);
      return field.get(null);
    }
  
    public static void main(String[] argv) throws Exception {
      @SuppressWarnings("unchecked")
      Coder<Object> testCoder = (Coder<Object>) getFullyQualifiedValue(argv[0]);
      @SuppressWarnings("unchecked")
      List<Object> testValues = (List<Object>) getFullyQualifiedValue(argv[1]);
  
      List<String> base64Encodings = Lists.newArrayList();
      for (Object value : testValues) {
        base64Encodings.add(CoderUtils.encodeToBase64(testCoder, value));
      }
      System.out.println(String.format("\"%s\"", Joiner.on("\",\n\"").join(base64Encodings)));
    }
  }
  