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Common utility classes

There is a newer version: 1.0.14

package com.nls.util;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;

public final class Ids {

    private Ids() {

    }

    public static  Optional get(Collection identifiables, Integer id) {
        return identifiables.stream().filter(o -> o.getId().equals(id)).findAny();
    }

    public static  T find(Collection identifiables, int id) {
        return identifiables.stream().filter(o -> o.getId() != null && o.getId() == id).findFirst().orElse(null);
    }

    public static  Set collect(Collection identifiables) {
        return identifiables.stream().map(HasId::getId).collect(Collectors.toSet());
    }

    public static  Map index(Collection identifiables) {
        return identifiables.stream().collect(Collectors.toMap(HasId::getId, Function.identity()));
    }

    public static  List select(Collection identifiables, Set ids) {
        return identifiables.stream().filter(o -> ids.contains(o.getId())).collect(Collectors.toList());
    }

}