InstancesManager.java

package ssmdp.instance;

import java.util.List;

public final class InstancesManager {

    private final List<InstanceFile> allInstances = List.of(
            new InstanceFile("Type1/Type1.1.txt", "Type1 1", "Type1"),
            new InstanceFile("Type1/Type1.2.txt", "Type1 2", "Type1"),
            new InstanceFile("Type1/Type1.3.txt", "Type1 3", "Type1"),
            new InstanceFile("Type1/Type1.4.txt", "Type1 4", "Type1"),
            new InstanceFile("Type1/Type1.5.txt", "Type1 5", "Type1"),
            new InstanceFile("Type1/Type1.6.txt", "Type1 6", "Type1"),
            new InstanceFile("Type1/Type1.7.txt", "Type1 7", "Type1"),
            new InstanceFile("Type1/Type1.8.txt", "Type1 8", "Type1"),
            new InstanceFile("Type1/Type1.9.txt", "Type1 9", "Type1"),
            new InstanceFile("Type1/Type1.10.txt", "Type1 10", "Type1"),
            new InstanceFile("Type2/Type2.1.txt", "Type2 1", "Type2"),
            new InstanceFile("Type2/Type2.2.txt", "Type2 2", "Type2"),
            new InstanceFile("Type2/Type2.3.txt", "Type2 3", "Type2"),
            new InstanceFile("Type2/Type2.4.txt", "Type2 4", "Type2"),
            new InstanceFile("Type2/Type2.5.txt", "Type2 5", "Type2"),
            new InstanceFile("Type2/Type2.6.txt", "Type2 6", "Type2"),
            new InstanceFile("Type2/Type2.7.txt", "Type2 7", "Type2"),
            new InstanceFile("Type2/Type2.8.txt", "Type2 8", "Type2"),
            new InstanceFile("Type2/Type2.9.txt", "Type2 9", "Type2"),
            new InstanceFile("Type2/Type2.10.txt", "Type2 10", "Type2"));

    public List<InstanceFile> getInstances() {
        return allInstances;
    }

    public List<InstanceFile> getInstancesByType(String type) {
        return allInstances.stream()
                .filter(instance -> instance.type().equals(type))
                .toList();
    }

    public InstanceFile getInstance(int index) {
        return allInstances.get(index);
    }

    public List<InstanceFile> getInstances(int fromIndex, int toIndex) {
        return allInstances.subList(fromIndex, toIndex);
    }

    public InstanceFile getInstanceByType(String type, int index) {
        return getInstancesByType(type).get(index);
    }

    public List<InstanceFile> getInstances(String type, int fromIndex, int toIndex) {
        return getInstancesByType(type).subList(fromIndex, toIndex);
    }

    public InstanceFile getInstanceByFileName(String fileName) {
        return allInstances.stream()
                .filter(instance -> instance.fileName().equals(fileName))
                .findFirst()
                .orElseThrow(() -> new IllegalArgumentException(
                        "No instance with file name: " + fileName));
    }

}