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Jqwik Engine module

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package net.jqwik.engine.support;

import java.io.*;
import java.util.*;
import java.util.stream.*;

import org.junit.platform.commons.support.*;

public class JqwikStringSupport {
	public static String parameterTypesToString(Class... classes) {
		return ClassSupport.nullSafeToString(classes);
	}

	public static String displayString(Object object) {
		if (object == null)
			return "null";
		if (object instanceof Class) {
			return ((Class) object).getName();
		}
		if (object instanceof Collection) {
			@SuppressWarnings("unchecked")
			Collection collection = (Collection) object;
			String elements = collection.stream().map(JqwikStringSupport::displayString).collect(Collectors.joining(", "));
			return String.format("[%s]", elements);
		}
		if (object.getClass().isArray()) {
			if (object.getClass().getComponentType().isPrimitive()) {
				return nullSafeToString(object);
			}
			Object[] array = (Object[]) object;
			String elements = Arrays.stream(array).map(JqwikStringSupport::displayString).collect(Collectors.joining(", "));
			return String.format("%s{%s}", object.getClass().getSimpleName(), elements);
		}
		if (String.class.isAssignableFrom(object.getClass())) {
			return String.format("\"%s\"", replaceUnrepresentableCharacters(object.toString()));
		}
		return replaceUnrepresentableCharacters(object.toString());
	}

	private static String replaceUnrepresentableCharacters(String aString) {
		return aString.replace('\u0000', '\ufffd');
	}

	private static String nullSafeToString(Object obj) {
		if (obj == null) {
			return "null";
		}

		try {
			if (obj.getClass().isArray()) {
				if (obj.getClass().getComponentType().isPrimitive()) {
					if (obj instanceof boolean[]) {
						return Arrays.toString((boolean[]) obj);
					}
					if (obj instanceof char[]) {
						return Arrays.toString((char[]) obj);
					}
					if (obj instanceof short[]) {
						return Arrays.toString((short[]) obj);
					}
					if (obj instanceof byte[]) {
						return Arrays.toString((byte[]) obj);
					}
					if (obj instanceof int[]) {
						return Arrays.toString((int[]) obj);
					}
					if (obj instanceof long[]) {
						return Arrays.toString((long[]) obj);
					}
					if (obj instanceof float[]) {
						return Arrays.toString((float[]) obj);
					}
					if (obj instanceof double[]) {
						return Arrays.toString((double[]) obj);
					}
				}
				return Arrays.deepToString((Object[]) obj);
			}

			// else
			return obj.toString();
		}
		catch (Throwable throwable) {
			JqwikExceptionSupport.rethrowIfBlacklisted(throwable);
			return defaultToString(obj);
		}
	}

	private static String defaultToString(Object obj) {
		if (obj == null) {
			return "null";
		}

		return obj.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(obj));
	}

	public static List toLines(String string) {
		if (string == null) {
			return Collections.emptyList();
		}
		List lines = new ArrayList<>();
		BufferedReader reader = new BufferedReader(new StringReader(string));
		try {
			String line = reader.readLine();
			while (line != null) {
				if (!line.isEmpty()) {
					lines.add(line);
				}
				line = reader.readLine();
			}
		} catch (IOException cannotHappen) {
			throw new RuntimeException(cannotHappen);
		}
		return lines;
	}
}
    

    

    

            

    

            



    
    






    
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