// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.errorhandling;

import com.google.common.collect.ImmutableList;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * @author tonytv
 */
public class Results<DATA, ERROR> {

    private final List<DATA> data;
    private final List<ERROR> errors;

    public Results(List<DATA> data, List<ERROR> errors) {
        this.data = ImmutableList.copyOf(data);
        this.errors = ImmutableList.copyOf(errors);
    }

    public boolean hasErrors() {
        return !errors.isEmpty();
    }

    public List<DATA> data() {
        return data;
    }

    public List<ERROR> errors() {
        return errors;
    }

    public static class Builder<DATA, ERROR> {
        private final List<DATA> data = new ArrayList<>();
        private final List<ERROR> errors = new ArrayList<>();

        public void addData(DATA d) {
            data.add(d);
        }

        public void addAllData(Collection<? extends DATA> d) {
            data.addAll(d);
        }

        public void addError(ERROR e) {
            errors.add(e);
        }

        public void addAllErrors(Collection<? extends ERROR> e) {
            errors.addAll(e);
        }

        public Results<DATA, ERROR> build() {
            return new Results<>(data, errors);
        }
    }

}