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A Java library to parse, migrate and validate crons as well as describe them in human readable language

There is a newer version: 9.2.1

package com.cronutils.model;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import com.cronutils.mapper.CronMapper;
import com.cronutils.model.definition.CronDefinition;
import com.cronutils.model.field.CronField;
import com.cronutils.model.field.CronFieldName;
import com.cronutils.utils.Preconditions;

public class CompositeCron implements Cron {
    private Pattern split = Pattern.compile("\\|");
    private List crons;
    private CronDefinition definition;

    public CompositeCron(List crons){
        this.crons = Collections.unmodifiableList(crons);
        Preconditions.checkNotNullNorEmpty(crons, "List of Cron cannot be null or empty");
        this.definition = crons.get(0).getCronDefinition();
        Preconditions.checkArgument(crons.size()==crons.stream().filter(c->c.getCronDefinition().equals(definition)).count(), "All Cron objects must have same definition for CompositeCron");
    }

    public List getCrons() {
        return crons;
    }

    @Override
    public CronField retrieve(CronFieldName name) {
        throw new UnsupportedOperationException("Currently not supported for CompositeCron");
    }

    @Override
    public Map retrieveFieldsAsMap() {
        throw new UnsupportedOperationException("Currently not supported for CompositeCron");
    }

    @Override
    public String asString() {
        StringBuilder builder = new StringBuilder();
        List patterns = crons.stream().map(Cron::asString).collect(Collectors.toList());
        int fields = patterns.get(0).split(" ").length;
        for(int j=0;j