package com.drew.imaging.png;
import com.drew.lang.KeyValuePair;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.png.PngDirectory;
import org.junit.Test;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import static org.junit.Assert.*;
/**
* @author Drew Noakes http://drewnoakes.com
*/
public class PngMetadataReaderTest
{
@NotNull
public static <T extends Directory> T processFile(@NotNull String filePath, @NotNull Class<T> directoryClass) throws IOException, PngProcessingException
{
T directory = processFile(filePath).getDirectory(directoryClass);
assertNotNull(directory);
return directory;
}
@NotNull
private static Metadata processFile(@NotNull String filePath) throws PngProcessingException, IOException
{
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
return PngMetadataReader.readMetadata(inputStream);
} finally {
if (inputStream != null) {
inputStream.close();
}
}
}
@Test
public void testGimpGreyscaleWithManyChunks() throws Exception
{
PngDirectory directory = processFile("Tests/Data/gimp-8x12-greyscale-alpha-time-background.png", PngDirectory.class);
assertEquals(8, directory.getInt(PngDirectory.TAG_IMAGE_WIDTH));
assertEquals(12, directory.getInt(PngDirectory.TAG_IMAGE_HEIGHT));
assertEquals(8, directory.getInt(PngDirectory.TAG_BITS_PER_SAMPLE));
assertEquals(4, directory.getInt(PngDirectory.TAG_COLOR_TYPE));
assertEquals(0, directory.getInt(PngDirectory.TAG_COMPRESSION_TYPE));
assertEquals(0, directory.getInt(PngDirectory.TAG_FILTER_METHOD));
assertEquals(0, directory.getInt(PngDirectory.TAG_INTERLACE_METHOD));
assertEquals(0.45455, directory.getDouble(PngDirectory.TAG_GAMMA), 0.00001);
assertArrayEquals(new byte[]{0, 52}, directory.getByteArray(PngDirectory.TAG_BACKGROUND_COLOR));
//noinspection ConstantConditions
assertEquals("Tue Jan 01 04:08:30 GMT 2013", directory.getDate(PngDirectory.TAG_LAST_MODIFICATION_TIME).toString());
@SuppressWarnings("unchecked")
List<KeyValuePair> pairs = (List<KeyValuePair>)directory.getObject(PngDirectory.TAG_TEXTUAL_DATA);
assertNotNull(pairs);
assertEquals(1, pairs.size());
assertEquals("Comment", pairs.get(0).getKey());
assertEquals("Created with GIMP", pairs.get(0).getValue());
}
}