Feather2 / feather2-runtime / src / main / java / uk / co / nickthecoder / feather / runtime / FileExtensions.java

package uk.co.nickthecoder.feather.runtime;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

final public class FileExtensions {

    private FileExtensions() {
    }


    public static String extension(File file) {
        String name = file.getName();
        int lastDot = name.lastIndexOf('.');
        return (lastDot >= 0) ? name.substring(lastDot + 1) : "";
    }


    public static String nameWithoutExtension(File file) {
        String name = file.getName();
        int dot = name.lastIndexOf(".");
        if (dot > 0) {
            return name.substring(0, dot);
        } else {
            return name;
        }
    }


    public static String pathWithoutExtension(File file) {
        String p = file.getParent();
        if (p == null) {
            return nameWithoutExtension(file);
        } else {
            return p + File.separator + nameWithoutExtension(file);
        }
    }

    public static boolean isSymlink(File file) throws IOException {
        if (file == null)
            throw new NullPointerException("File must not be null");
        File canon;
        if (file.getParent() == null) {
            canon = file;
        } else {
            File canonDir = file.getParentFile().getCanonicalFile();
            canon = new File(canonDir, file.getName());
        }
        return !canon.getCanonicalFile().equals(canon.getAbsoluteFile());
    }

    // Note, there's a bug in Java 7 on Windows, so upgrade to Java 8 or above.

    public static File homeDirectory() {
        return new File(java.lang.System.getProperty("user.home"));
    }


    public static String readText(File file) throws IOException {
        return readText(file, StandardCharsets.UTF_8);
    }


    public static String readText(File file, Charset charset) throws IOException {
        try (Reader reader = new InputStreamReader(new FileInputStream(file), charset)) {
            StringWriter buffer = new StringWriter();
            char[] cArray = new char[1024];
            var chars = reader.read(cArray, 0, cArray.length);
            while (chars >= 0) {
                buffer.write(cArray, 0, chars);
                chars = reader.read(cArray, 0, cArray.length);
            }
            return buffer.toString();
        }
    }

    public static void writeText(File file, String str) throws IOException {
        writeText(file, str, StandardCharsets.UTF_8);
    }

    public static void writeText(File file, String str, Charset charset) throws IOException {
        try (FileOutputStream fos = new FileOutputStream(file)) {
            fos.write(str.getBytes(charset));
        }
    }

}