001 package ezvcard.util;
002
003 import java.io.ByteArrayOutputStream;
004 import java.io.Closeable;
005 import java.io.File;
006 import java.io.IOException;
007 import java.io.InputStream;
008
009 /*
010 Copyright (c) 2012, Michael Angstadt
011 All rights reserved.
012
013 Redistribution and use in source and binary forms, with or without
014 modification, are permitted provided that the following conditions are met:
015
016 1. Redistributions of source code must retain the above copyright notice, this
017 list of conditions and the following disclaimer.
018 2. Redistributions in binary form must reproduce the above copyright notice,
019 this list of conditions and the following disclaimer in the documentation
020 and/or other materials provided with the distribution.
021
022 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
023 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
026 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
027 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
028 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
029 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
030 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
031 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
032
033 The views and conclusions contained in the software and documentation are those
034 of the authors and should not be interpreted as representing official policies,
035 either expressed or implied, of the FreeBSD Project.
036 */
037
038 /**
039 * I/O helper classes.
040 * @author Michael Angstadt
041 */
042 public class IOUtils {
043 /**
044 * Gets the extension off a file's name.
045 * @param file the file
046 * @return its extension (e.g. "jpg") or null if it doesn't have one
047 */
048 public static String getFileExtension(File file) {
049 String fileName = file.getName();
050 int dot = fileName.lastIndexOf('.');
051 if (dot >= 0 && dot < fileName.length() - 1) {
052 return fileName.substring(dot + 1);
053 }
054 return null;
055 }
056
057 /**
058 * Reads all the bytes from an input stream.
059 * @param in the input stream
060 * @return the bytes
061 * @throws IOException if there's a problem reading from the input stream
062 */
063 public static byte[] toByteArray(InputStream in) throws IOException {
064 return toByteArray(in, false);
065 }
066
067 /**
068 * Reads all the bytes from an input stream.
069 * @param in the input stream
070 * @param close true to close the input stream when done, false not to
071 * @return the bytes
072 * @throws IOException if there's a problem reading from the input stream
073 */
074 public static byte[] toByteArray(InputStream in, boolean close) throws IOException {
075 try {
076 ByteArrayOutputStream out = new ByteArrayOutputStream();
077 byte[] buffer = new byte[4096];
078 int read;
079 while ((read = in.read(buffer)) != -1) {
080 out.write(buffer, 0, read);
081 }
082 return out.toByteArray();
083 } finally {
084 in.close();
085 }
086 }
087
088 /**
089 * Closes a closeable resource, catching its {@link IOException}.
090 * @param closeable the resource to close (can be null)
091 */
092 public static void closeQuietly(Closeable closeable) {
093 try {
094 if (closeable != null) {
095 closeable.close();
096 }
097 } catch (IOException e) {
098 //ignore
099 }
100 }
101 }