src/main/java/com/example/lab3/ImageCollection.java - master - Shalva/Lab3_SlideNavigationTool

src/main/java/com/example/lab3/ImageCollection.java
86 строк3 KB
Kvaratskheliia Shalva
Добавлен исходный код проекта Lab3_SlideNavigationTool
14 июн 2026, 17:20
14 июн 2026, 17:20781cb59
package com.example.lab3;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ImageCollection implements ImageAggregate {

    @Override
    public ImageIterator getIterator(File directory, String filterType) {
        return new DirectoryIterator(directory, filterType);
    }

    private static class DirectoryIterator implements ImageIterator {
        private List<File> files = new ArrayList<>();
        private int currentIdx = -1;

        public DirectoryIterator(File directory, String filterType) {
            if (directory == null || !directory.isDirectory()) return;

            File[] matchedFiles = directory.listFiles(new FilenameFilter() {
                @Override
                public boolean accept(File dir, String name) {
                    String lower = name.toLowerCase();
                    switch (filterType) {
                        case "JPEG/JPG": return lower.endsWith(".jpg") || lower.endsWith(".jpeg");
                        case "PNG": return lower.endsWith(".png");
                        case "GIF": return lower.endsWith(".gif");
                        case "Все":
                        default: return lower.endsWith(".jpg") || lower.endsWith(".jpeg")
                                || lower.endsWith(".png") || lower.endsWith(".gif");
                    }
                }
            });

            if (matchedFiles != null) {
                files.addAll(Arrays.asList(matchedFiles));
                if (!files.isEmpty()) {
                    currentIdx = 0;
                }
            }
        }

        @Override
        public boolean hasNext() { return !files.isEmpty(); }

        @Override
        public File next() {
            if (files.isEmpty()) return null;
            currentIdx = (currentIdx + 1) % files.size(); // Зацикливание вперед
            return files.get(currentIdx);
        }

        @Override
        public boolean hasPrevious() { return !files.isEmpty(); }

        @Override
        public File previous() {
            if (files.isEmpty()) return null;
            currentIdx = (currentIdx - 1 + files.size()) % files.size(); // Зацикливание назад
            return files.get(currentIdx);
        }

        @Override
        public File first() {
            if (files.isEmpty()) return null;
            currentIdx = 0;
            return files.get(currentIdx);
        }

        @Override
        public File last() {
            if (files.isEmpty()) return null;
            currentIdx = files.size() - 1;
            return files.get(currentIdx);
        }

        @Override
        public int getIndex() { return currentIdx; }

        @Override
        public int getTotalCount() { return files.size(); }
    }
}