src/test/java/org/apache/commons/imaging/formats/png/PngTextTest.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.commons.imaging.formats.png;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.imaging.ImageFormats;
import org.apache.commons.imaging.Imaging;
import org.apache.commons.imaging.formats.png.PngConstants;
import org.apache.commons.imaging.formats.png.PngImageInfo;
import org.apache.commons.imaging.formats.png.PngText;
import org.apache.commons.imaging.util.IoUtils;

public class PngTextTest extends PngBaseTest {

    public void test() throws Exception {
        final int width = 1;
        final int height = 1;
        final BufferedImage srcImage = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_ARGB);
        srcImage.setRGB(0, 0, Color.red.getRGB());

        final Map<String,Object> writeParams = new HashMap<String,Object>();

        final List<PngText> writeTexts = new ArrayList<PngText>();
        {
            final String keyword = "a";
            final String text = "b";
            writeTexts.add(new PngText.Text(keyword, text));
        }
        {
            final String keyword = "c";
            final String text = "d";
            writeTexts.add(new PngText.Ztxt(keyword, text));
        }
        {
            final String keyword = "e";
            final String text = "f";
            final String languageTag = "g";
            final String translatedKeyword = "h";
            writeTexts.add(new PngText.Itxt(keyword, text, languageTag,
                    translatedKeyword));
        }

        writeParams.put(PngConstants.PARAM_KEY_PNG_TEXT_CHUNKS, writeTexts);

        final byte bytes[] = Imaging.writeImageToBytes(srcImage,
                ImageFormats.PNG, writeParams);

        final File tempFile = createTempFile("temp", ".png");
        IoUtils.writeToFile(bytes, tempFile);

        final PngImageInfo imageInfo = (PngImageInfo) Imaging.getImageInfo(bytes);
        assertNotNull(imageInfo);

        final List<PngText> readTexts = imageInfo.getTextChunks();
        assertEquals(readTexts.size(), 3);
        for (int i = 0; i < readTexts.size(); i++) {
            final PngText text = readTexts.get(i);
            if (text.keyword.equals("a")) {
                assertEquals(text.text, "b");
            } else if (text.keyword.equals("c")) {
                assertEquals(text.text, "d");
            } else if (text.keyword.equals("e")) {
                assertEquals(text.text, "f");
            } else {
                fail("unknown text chunk.");
            }
        }
    }

}