IOUtil.java

/*
 * Copyright 2014 Skynav, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY SKYNAV, INC. AND ITS CONTRIBUTORS “AS IS” AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL SKYNAV, INC. OR ITS CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.skynav.ttv.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;

public class IOUtil {

    public static void closeSafely(InputStream is) {
        try {
            if (is != null)
                is.close();
        } catch (Throwable e) {
        }
    }

    public static void closeSafely(OutputStream os) {
        try {
            if (os != null)
                os.close();
        } catch (Throwable e) {
        }
    }

    public static void closeSafely(Reader r) {
        try {
            if (r != null)
                r.close();
        } catch (Throwable e) {
        }
    }

    public static boolean deleteSafely(File file) {
        boolean deleted = false;
        try {
            if (file != null)
                deleted = file.delete();
        } catch (Throwable e) {
        }
        return deleted;
    }

    public static void copy(InputStream is, OutputStream os) throws IOException {
        byte[] buf = new byte[4096];
        int nb;
        while ((nb = is.read(buf)) >= 0) {
            if (nb > 0)
                os.write(buf, 0, nb);
            else
                Thread.yield();
        }
    }

    public static int readCompletely(InputStream is, byte[] buf) throws IOException {
        int len = buf.length;
        int rem = len;
        int nb;
        while (rem > 0) {
            nb = is.read(buf, len - rem, rem);
            if (nb < 0)
                break;
            else if (nb > 0)
                rem -= nb;
            else
                Thread.yield();
        }
        return len - rem;
    }

    public static String getDirectoryPath(File f) {
        try {
            File d = getDirectory(f);
            return (d != null) ? d.getCanonicalPath() : null;
        } catch (IOException e) {
            return null;
        }
    }

    public static File getDirectory(File f) {
        if (f.isDirectory())
            return f;
        else {
            try {
                String p = f.getCanonicalPath();
                return new File(p.substring(0, p.lastIndexOf(File.separatorChar)));
            } catch (IOException e) {
            }
        }
        return null;
    }

}