java/copy-image-resizer/src/cz/frantovo/copyImageResizer/RecursiveImageResizer.java
3 * Copyright © 2014 František Kučera (frantovo.cz)
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package cz.frantovo.copyImageResizer;
20 import cz.frantovo.copyImageResizer.SingleImageResizer.ImageFormat;
21 import java.awt.image.BufferedImage;
23 import java.io.FileInputStream;
24 import java.io.FileNotFoundException;
25 import java.io.FileOutputStream;
26 import java.io.IOException;
27 import java.io.InputStream;
28 import java.nio.channels.Channels;
29 import java.nio.channels.FileChannel;
30 import java.nio.channels.ReadableByteChannel;
31 import java.nio.channels.WritableByteChannel;
32 import java.util.logging.Level;
33 import java.util.logging.Logger;
34 import javax.imageio.ImageIO;
38 * @author Ing. František Kučera (frantovo.cz)
40 public class RecursiveImageResizer {
42 private static final Logger log = Logger.getLogger(RecursiveImageResizer.class.getName());
44 private final SingleImageResizer resizer = new SingleImageResizer();
46 public void resize(RecursiveOptions options) throws RecursiveException, ResizeException {
47 resizeDirectory(options.getInput(), options);
50 private void resizeFile(File inputFile, RecursiveOptions options) throws ResizeException {
51 File inputFileRelative = relativize(options.getInput(), inputFile);
52 log.log(Level.FINE, "Resizing file: {0}", inputFileRelative);
54 ImageFormat format = ImageFormat.getMatching(inputFile.getName());
57 log.log(Level.FINE, "Skipping file: {0} (no image format matched this extension)", inputFileRelative);
60 for (SizeSpecification size : options.getSizes()) {
61 File sizeRoot = new File(options.getOutput(), size.getDirectory());
62 File outputFile = new File(sizeRoot, inputFileRelative.getPath());
63 try (FileInputStream input = new FileInputStream(inputFile)) {
64 BufferedImage image = readImage(input);
65 if (shouldResize(image, size)) {
66 try (FileOutputStream output = new FileOutputStream(outputFile)) {
67 resizer.resize(image, output, size, format);
70 log.log(Level.INFO, "File: {0} has already required size → just copy", inputFileRelative);
71 justCopy(inputFile, outputFile);
75 } catch (FileNotFoundException e) {
76 throw new ResizeException("Error while opening stream", e);
77 } catch (IOException e) {
78 throw new ResizeException("Error while closing stream", e);
83 private static boolean shouldResize(BufferedImage input, SizeSpecification requested) {
84 if (requested.isResizeSmaller()) {
85 return input.getHeight() != requested.getHeight() || input.getWidth() != requested.getWidth();
87 return input.getHeight() > requested.getHeight() || input.getWidth() > requested.getWidth();
91 private static BufferedImage readImage(InputStream input) throws ResizeException {
93 return ImageIO.read(input);
94 } catch (IOException e) {
95 throw new ResizeException("Unable to read image from stream", e);
99 private static void justCopy(File inputFile, File outputFile) throws ResizeException {
102 if (!outputFile.exists()) {
103 outputFile.createNewFile();
106 try (FileChannel input = new FileInputStream(inputFile).getChannel()) {
107 try (FileChannel output = new FileOutputStream(outputFile).getChannel()) {
108 output.transferFrom(input, 0, input.size());
112 } catch (IOException e) {
113 throw new ResizeException("Unable copy stream/channel", e);
118 private void resizeDirectory(File directory, RecursiveOptions options) throws ResizeException {
120 log.log(Level.FINE, "Resizing directory: {0}", directory);
122 for (SizeSpecification size : options.getSizes()) {
123 File relative = relativize(options.getInput(), directory);
124 File sizeRoot = new File(options.getOutput(), size.getDirectory());
125 File dir = new File(sizeRoot, relative.getPath());
129 for (File entry : directory.listFiles()) {
130 if (entry.isDirectory()) {
131 resizeDirectory(entry, options);
133 resizeFile(entry, options);
139 private static File relativize(File root, File child) {
140 return root.toPath().relativize(child.toPath()).toFile();