Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;

public class Main {
    /** Cached copy of system encoding string */
    private static String _systemEncoding = null;

    /**
     * @return true if system uses UTF-8 by default
     */
    public static boolean isSystemUtf8() {
        String systemEncoding = getSystemEncoding();
        return (systemEncoding != null && systemEncoding.toUpperCase().equals("UTF-8"));
    }

    /**
     * @return name of the system's character encoding
     */
    public static String getSystemEncoding() {
        if (_systemEncoding == null) {
            _systemEncoding = determineSystemEncoding();
        }
        return _systemEncoding;
    }

    /**
     * Use a temporary file to obtain the name of the default system encoding
     * @return name of default system encoding, or null if write failed
     */
    private static String determineSystemEncoding() {
        File tempFile = null;
        String encoding = null;
        try {
            tempFile = File.createTempFile("gpsprune", null);
            OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(tempFile));
            encoding = getEncoding(writer);
            writer.close();
        } catch (IOException e) {
        } // value stays null
          // Delete temp file
        if (tempFile != null && tempFile.exists()) {
            if (!tempFile.delete()) {
                System.err.println("Cannot delete temp file: " + tempFile.getAbsolutePath());
            }
        }
        // If writing failed (eg permissions) then just ask system for default
        if (encoding == null)
            encoding = Charset.defaultCharset().name();
        return encoding;
    }

    /**
     * Get the default system encoding using a writer
     * @param inWriter writer object
     * @return string defining encoding
     */
    public static String getEncoding(OutputStreamWriter inWriter) {
        String encoding = inWriter.getEncoding();
        try {
            encoding = Charset.forName(encoding).name();
        } catch (Exception e) {
        } // ignore failure to find encoding
        return encoding;
    }
}