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.FileChannel;
29 import java.util.logging.Level;
30 import java.util.logging.Logger;
31 import javax.imageio.ImageIO;
35 * @author Ing. František Kučera (frantovo.cz)
37 public class RecursiveImageResizer {
39 private static final Logger log = Logger.getLogger(RecursiveImageResizer.class.getName());
41 private final SingleImageResizer resizer = new SingleImageResizer();
43 public void resize(RecursiveOptions options) throws RecursiveException, ResizeException {
44 resizeDirectory(options.getInput(), options);
47 private void resizeFile(File inputFile, RecursiveOptions options) throws ResizeException {
48 File inputFileRelative = relativize(options.getInput(), inputFile);
49 log.log(Level.FINER, "Resizing file: {0}", inputFileRelative);
51 ImageFormat format = ImageFormat.getMatching(inputFile.getName());
54 log.log(Level.FINER, "Skipping file: {0} (no image format matched this extension)", inputFileRelative);
57 for (SizeSpecification size : options.getSizes()) {
58 File sizeRoot = new File(options.getOutput(), size.getDirectory());
59 File outputFile = new File(sizeRoot, inputFileRelative.getPath());
60 try (FileInputStream input = new FileInputStream(inputFile)) {
61 BufferedImage image = readImage(input);
62 if (shouldResize(image, size)) {
63 try (FileOutputStream output = new FileOutputStream(outputFile)) {
64 resizer.resize(image, output, size, format);
67 log.log(Level.FINER, "File: {0} has already required size → just copy", inputFileRelative);
68 justCopy(inputFile, outputFile);
72 } catch (FileNotFoundException e) {
73 throw new ResizeException("Error while opening stream", e);
74 } catch (IOException e) {
75 throw new ResizeException("Error while closing stream", e);
80 private static boolean shouldResize(BufferedImage input, SizeSpecification requested) {
81 if (requested.isResizeSmaller()) {
82 return input.getHeight() != requested.getHeight() || input.getWidth() != requested.getWidth();
84 return input.getHeight() > requested.getHeight() || input.getWidth() > requested.getWidth();
88 private static BufferedImage readImage(InputStream input) throws ResizeException {
90 return ImageIO.read(input);
91 } catch (IOException e) {
92 throw new ResizeException("Unable to read image from stream", e);
96 private static void justCopy(File inputFile, File outputFile) throws ResizeException {
99 if (!outputFile.exists()) {
100 outputFile.createNewFile();
103 try (FileChannel input = new FileInputStream(inputFile).getChannel()) {
104 try (FileChannel output = new FileOutputStream(outputFile).getChannel()) {
105 output.transferFrom(input, 0, input.size());
109 } catch (IOException e) {
110 throw new ResizeException("Unable copy stream/channel", e);
115 private void resizeDirectory(File directory, RecursiveOptions options) throws ResizeException {
117 log.log(Level.FINE, "Resizing directory: {0}", directory);
119 for (SizeSpecification size : options.getSizes()) {
120 File relative = relativize(options.getInput(), directory);
121 File sizeRoot = new File(options.getOutput(), size.getDirectory());
122 File dir = new File(sizeRoot, relative.getPath());
126 for (File entry : directory.listFiles()) {
127 if (entry.isDirectory()) {
128 resizeDirectory(entry, options);
130 resizeFile(entry, options);
136 private static File relativize(File root, File child) {
137 return root.toPath().relativize(child.toPath()).toFile();