GroupManager/src/main/java/org/anjocaido/groupmanager/utils/Tasks.java

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package org.anjocaido.groupmanager.utils;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

import org.anjocaido.groupmanager.GroupManager;
import org.anjocaido.groupmanager.data.Group;

/**
 *
 * @author gabrielcouto
 */
public abstract class Tasks {

    /**
     * Appends a string to a file
     *
     * @param data
     * @param file
     */
    public static void appendStringToFile(final String data, final String file) throws IOException {
        final FileWriter outStream = new FileWriter("." + System.getProperty("file.separator") + file, true);
        final BufferedWriter out = new BufferedWriter(outStream);
        data.replaceAll("\n", System.getProperty("line.separator"));
        out.append(new SimpleDateFormat("yyyy-MM-dd HH-mm").format(System.currentTimeMillis()));
        out.append(System.getProperty("line.separator"));
        out.append(data);
        out.append(System.getProperty("line.separator"));
        out.close();
    }

    public static void copy(final File src, final File dst) throws IOException {
        final InputStream in = new FileInputStream(src);
        copy(in, dst);
    }

    public static void copy(final InputStream src, final File dst) throws IOException {
        final InputStream in = src;
        final OutputStream out = new FileOutputStream(dst);
        // Transfer bytes from in to out
        final byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        out.close();
        try {
            in.close();
        } catch (final Exception e) {
        }
    }

    public static String getDateString() {
        final GregorianCalendar now = new GregorianCalendar();
        String date = "";
        date += now.get(Calendar.DAY_OF_MONTH);
        date += "-";
        date += now.get(Calendar.HOUR);
        date += "-";
        date += now.get(Calendar.MINUTE);
        return date;
    }

    public static String getGroupListInString(final List<Group> list) {
        if (list == null) {
            return "";
        }
        String result = "";
        for (int i = 0; i < list.size(); i++) {
            result += list.get(i).getName();
            if (i < list.size() - 1) {
                result += ", ";
            }
        }
        return result;
    }

    /**
     * Gets the exception stack trace as a string.
     *
     * @param exception
     * @return stack trace as a string
     */
    public static String getStackTraceAsString(final Exception exception) {
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw);
        exception.printStackTrace(pw);
        return sw.toString();
    }

    public static String getStringArrayInString(final String[] list) {
        if (list == null) {
            return "";
        }
        String result = "";
        for (int i = 0; i < list.length; i++) {
            result += list[i];
            if (i < ((list.length) - 1)) {
                result += ", ";
            }
        }
        return result;
    }

    public static String getStringListInString(final List<String> list) {
        if (list == null) {
            return "";
        }
        String result = "";
        for (int i = 0; i < list.size(); i++) {
            result += list.get(i);
            if (i < list.size() - 1) {
                result += ", ";
            }
        }
        return result;
    }

    public static String join(final String[] arr, final String separator) {
        if (arr.length == 0)
            return "";
        String out = arr[0].toString();
        for (int i = 1; i < arr.length; i++)
            out += separator + arr[i];
        return out;
    }

    public static void removeOldFiles(final GroupManager gm, final File folder) {
        if (folder.isDirectory()) {
            final long oldTime = System.currentTimeMillis() - (((long) gm.getGMConfig().getBackupDuration() * 60 * 60) * 1000);
            for (final File olds : folder.listFiles()) {
                if (olds.isFile()) {
                    if (olds.lastModified() < oldTime) {
                        try {
                            olds.delete();
                        } catch (final Exception e) {
                        }
                    }
                }
            }
        }
    }

}