Add java program to create test data

testdata/src/creation/Creator.java

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+package creation;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.nio.file.Files;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Random;
+import java.util.UUID;
+
+import javax.imageio.ImageIO;
+
+public class Creator {
+	public static void main(String[] args) {
+		Random r = new Random(1);
+
+		String basedir = "outputdir/data";
+		String[] names = NameCreator.generateNames(r);
+
+		try {
+			FileOutputStream collectionOutput = new FileOutputStream(basedir + "/collection.json");
+			PrintWriter collectionWriter = new PrintWriter(collectionOutput);
+			collectionWriter.write("{\n  \"textures\": [\n    ");
+			boolean first = true;
+			int i=1;
+			for (String name : names) {
+				if (first) {
+					first = false;
+				} else {
+					collectionWriter.write(",\n    ");
+				}
+				System.out.println("Creating " + name + " (texture " + i + " of " + names.length + ")");
+				storeImage(name, basedir, r, collectionWriter);
+				i++;
+			}
+			collectionWriter.write("\n  ]\n}\n");
+			collectionWriter.close();
+			collectionOutput.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private static boolean randBool(Random r, double probability) {
+		return r.nextDouble() < probability;
+	}
+
+	private static void storeImage(String name, String outputdir, Random r, PrintWriter collectionWriter)
+			throws IOException {
+		int size = 256 * (1 << r.nextInt(6));
+		NamedColor[] shuffling = Dictionary.colors.clone();
+		NamedColor[] mycolors = new NamedColor[3];
+		for (int i = 0; i < 3; i++) {
+			int otherPos = r.nextInt(7 - i) + i;
+			mycolors[i] = shuffling[otherPos];
+			shuffling[otherPos] = shuffling[i];
+		}
+		MyDate date = randomDate(r);
+
+		boolean grey = randBool(r, 0.01);
+		boolean border = randBool(r, 0.1);
+		boolean bold = randBool(r, 0.03);
+		boolean italic = randBool(r, 0.07);
+		BufferedImage img = createImage(size, name, mycolors, date, grey, border, bold, italic);
+
+		File tmpLocation = new File(outputdir + "/tempimage");
+		ImageIO.write(img, name.substring(name.length() - 3), tmpLocation);
+		String hash = hashFile(tmpLocation);
+		String ending = name.substring(name.length() - 3);
+		if (ending.equals("jpg")) {
+			ending = "jpeg";
+		}
+		tmpLocation.renameTo(new File(outputdir + "/textures/" + hash));
+		String tags = mycolors[0].name + "\", \"" + mycolors[1].name + "\", \"" + mycolors[2].name;
+		if (grey) {
+			tags += "\", \"grey";
+		}
+		if (border) {
+			tags += "\", \"border";
+		}
+		if (bold) {
+			tags += "\", \"bold";
+		}
+		if (italic) {
+			tags += "\", \"italic";
+		}
+		collectionWriter.write("{\n");
+		collectionWriter.write("      \"id\": \"" + UUID.randomUUID() + "\",\n");
+		collectionWriter.write("      \"name\": \"" + name + "\",\n");
+		collectionWriter.write("      \"tags\": [\"" + tags + "\"],\n");
+		collectionWriter.write("      \"format\": \"" + ending + "\",\n");
+		collectionWriter.write("      \"resolution\": [" + size + ", " + size + "],\n");
+		collectionWriter.write("      \"added_on\": " + date.asJsonArray() + ",\n");
+		collectionWriter.write("      \"texture_hash\": \"" + hash + "\"\n");
+		collectionWriter.write("    }");
+	}
+
+	private static MyDate randomDate(Random r) {
+		int back = (int) (-300 * Math.log(r.nextDouble()));
+		return new MyDate(3, 6, 2019).ago(back);
+	}
+
+	private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
+
+	public static String bytesToHex(byte[] bytes) {
+		char[] hexChars = new char[bytes.length * 2];
+		for (int j = 0; j < bytes.length; j++) {
+			int v = bytes[j] & 0xFF;
+			hexChars[j * 2] = hexArray[v >>> 4];
+			hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+		}
+		return new String(hexChars);
+	}
+
+	private static String hashFile(File f) throws IOException {
+		byte[] data = Files.readAllBytes(f.toPath());
+		try {
+			MessageDigest hash = MessageDigest.getInstance("SHA-256");
+			byte[] hashval = hash.digest(data);
+			return bytesToHex(hashval);
+		} catch (NoSuchAlgorithmException e) {
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	private static BufferedImage createImage(int size, String name, NamedColor[] colors, MyDate date, boolean grey,
+			boolean border, boolean bold, boolean italic) {
+		BufferedImage img = new BufferedImage(size, size, BufferedImage.TYPE_INT_RGB);
+		Graphics g = img.getGraphics();
+
+		// background
+		if (grey) {
+			g.setColor(Color.LIGHT_GRAY);
+		} else {
+			g.setColor(Color.WHITE);
+		}
+		g.fillRect(0, 0, size, size);
+
+		// border
+		if (border) {
+			int w = size / 40;
+			int l = size - 2*w;
+			g.setColor(Color.BLACK);
+			g.fillRect(w, w, l, w);
+			g.fillRect(w, w, w, l);
+			g.fillRect(w, l, l, w);
+			g.fillRect(l, w, w, l);
+		}
+
+		// text
+		int fontstyle = Font.PLAIN;
+		if (bold) {
+			fontstyle |= Font.BOLD;
+		}
+		if (italic) {
+			fontstyle |= Font.ITALIC;
+		}
+		Font f = new Font("Arial", fontstyle, size / 10);
+		g.setFont(f);
+		g.setColor(Color.BLACK);
+		int width = g.getFontMetrics().stringWidth(name);
+		int basey = size / 2 + g.getFontMetrics().getAscent();
+		int textheight = g.getFontMetrics().getHeight();
+		g.drawString(name, (size - width) / 2, basey);
+		g.drawString(size + " x " + size, (size - width) / 2, basey + textheight);
+		g.drawString(date.asReadableString(), (size - width) / 2, basey + 2 * textheight);
+
+		// color dots
+		for (int i = 0; i < 3; i++) {
+			NamedColor current = colors[i];
+			g.setColor(current.color);
+			g.fillOval((1 + 3 * i) * size / 10, size * 3 / 10, size / 5, size / 5);
+		}
+
+		return img;
+	}
+}

testdata/src/creation/Dictionary.java

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+package creation;
+
+import java.awt.Color;
+
+public class Dictionary {
+	public static final String[] adjectives = { "fast", "slow", "long", "short", "fat", "big", "small", "angry",
+			"awful", "calm", "clever", "crazy", "dirty", "excited", "evil", "kind", "lucky", "poor", "shy", "soft",
+			"tall", };
+	public static final String[] animals = { "bat", "bee", "camel", "cat", "chicken", "cod", "deer", "dog", "duck",
+			"fly", "fox", "frog", "horse", "koala", "lion", "mouse", "owl", "pig", "rabbit", "rat", "tiger", "turtle",
+			"wolf", "zebra" };
+	public static final NamedColor[] colors = { new NamedColor("red", Color.RED),
+			new NamedColor("orange", Color.ORANGE), new NamedColor("yellow", Color.YELLOW),
+			new NamedColor("green", Color.GREEN), new NamedColor("blue", Color.BLUE),
+			new NamedColor("magenta", Color.MAGENTA), new NamedColor("black", Color.BLACK), };
+}

testdata/src/creation/MyDate.java

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+package creation;
+
+public class MyDate {
+	public final int day, month, year;
+
+	public MyDate(int day, int month, int year) {
+		if (!isValid(day, month, year)) {
+			throw new IllegalArgumentException("Invalid date");
+		}
+		this.day = day;
+		this.month = month;
+		this.year = year;
+	}
+
+	public String asJsonArray() {
+		return "[" + year + ", " + month + ", " + day + "]";
+	}
+	
+	public String asReadableString() {
+		return twoDigit(day) + "." + twoDigit(month) + "." + twoDigit(year);
+	}
+
+	public MyDate previous() {
+		if (isValid(day - 1, month, year)) {
+			return new MyDate(day - 1, month, year);
+		}
+		for (int possibleDay = 31; possibleDay >= 28; possibleDay--) {
+			if (isValid(possibleDay, month - 1, year)) {
+				return new MyDate(possibleDay, month - 1, year);
+			}
+		}
+		return new MyDate(31, 12, year - 1);
+	}
+	
+	public MyDate ago(int number) {
+		MyDate d = this;
+		for (int i=0; i<number; i++) {
+			d = d.previous();
+		}
+		return d;
+	}
+	
+	private static String twoDigit(int x) {
+		String s = ""+x;
+		while (s.length() < 2) {
+			s = "0"+s;
+		}
+		return s;
+	}
+
+	private boolean isValid(int day, int month, int year) {
+		int[] monthLengths = new int[] { 31, isLeapYear(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+		if (month < 1 || month > 12) {
+			return false;
+		}
+		int length = monthLengths[month - 1];
+		if (day < 1 || day > length) {
+			return false;
+		}
+		return true;
+	}
+
+	private boolean isLeapYear(int year) {
+		return (year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0);
+	}
+}

testdata/src/creation/NameCreator.java

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+package creation;
+
+import java.util.ArrayList;
+import java.util.Random;
+
+public class NameCreator {
+	private static void shuffle(ArrayList<String> list, Random r) {
+		for (int low=0; low<list.size()-1; low++) {
+			int high = r.nextInt(list.size() - low) + low;
+			
+			// swap
+			String sLow = list.get(low);
+			String sHigh = list.get(high);
+			list.set(low, sHigh);
+			list.set(high, sLow);
+		}
+	}
+
+	public static String[] generateNames(Random r) {
+		ArrayList<String> names = new ArrayList<>(); 
+		for (String ending : new String[] {"jpg", "png"}) {
+			for (String animal : Dictionary.animals) {
+				for (String adjective : Dictionary.adjectives) {
+					String name = adjective + "-" + animal + "." + ending;
+					names.add(name);
+				}
+			}
+		}
+		shuffle(names, r);
+		while (names.size() > 1000) {
+			names.remove(names.size() - 1);
+		}
+		return names.toArray(new String[1000]);
+	}
+}

testdata/src/creation/NamedColor.java

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+package creation;
+
+import java.awt.Color;
+
+public class NamedColor {
+	public final String name;
+	public final Color color;
+
+	public NamedColor(String name, Color color) {
+		this.name = name;
+		this.color = color;
+	}
+}