public static boolean fileContentEquals()

in src/main/java/org/apache/commons/io/file/PathUtils.java [819:868]
39 lines of code
13 McCabe index (conditional complexity)

    public static boolean fileContentEquals(final Path path1, final Path path2, final LinkOption[] linkOptions, final OpenOption[] openOptions)
            throws IOException {
        if (path1 == null && path2 == null) {
            return true;
        }
        if (path1 == null || path2 == null) {
            return false;
        }
        final Path nPath1 = path1.normalize();
        final Path nPath2 = path2.normalize();
        final boolean path1Exists = exists(nPath1, linkOptions);
        if (path1Exists != exists(nPath2, linkOptions)) {
            return false;
        }
        if (!path1Exists) {
            // Two not existing files are equal?
            // Same as FileUtils
            return true;
        }
        if (Files.isDirectory(nPath1, linkOptions)) {
            // don't compare directory contents.
            throw new IOException("Can't compare directories, only files: " + nPath1);
        }
        if (Files.isDirectory(nPath2, linkOptions)) {
            // don't compare directory contents.
            throw new IOException("Can't compare directories, only files: " + nPath2);
        }
        if (Files.size(nPath1) != Files.size(nPath2)) {
            // lengths differ, cannot be equal
            return false;
        }
        if (isSameFileSystem(path1, path2) && path1.equals(path2)) {
            // same file
            return true;
        }
        // Faster:
        try (RandomAccessFile raf1 = RandomAccessFileMode.READ_ONLY.create(path1.toRealPath(linkOptions));
                RandomAccessFile raf2 = RandomAccessFileMode.READ_ONLY.create(path2.toRealPath(linkOptions))) {
            return RandomAccessFiles.contentEquals(raf1, raf2);
        } catch (final UnsupportedOperationException e) {
            // Slower:
            // Handle
            // java.lang.UnsupportedOperationException
            // at com.sun.nio.zipfs.ZipPath.toFile(ZipPath.java:656)
            try (InputStream inputStream1 = Files.newInputStream(nPath1, openOptions);
                    InputStream inputStream2 = Files.newInputStream(nPath2, openOptions)) {
                return IOUtils.contentEquals(inputStream1, inputStream2);
            }
        }
    }