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Assertj-Swing JUnit4 extension

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/*
 * Licensed 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.
 *
 * Copyright 2012-2018 the original author or authors.
 */
package org.assertj.swing.junit.ant;

import static org.assertj.swing.image.ImageFileExtensions.PNG;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

import javax.imageio.ImageIO;

import org.apache.commons.codec.binary.Base64;

/**
 * Understands how to encode a given image using the base64 algorithm.
 * 
 * @author Alex Ruiz
 */
class ImageEncoder {

  String encodeBase64(BufferedImage image) throws IOException {
    try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
      ImageIO.write(image, PNG, out);
      byte[] encoded = Base64.encodeBase64(out.toByteArray());
      return new String(encoded, StandardCharsets.UTF_8);
    }
  }
}