/*
 * Copyright 2021 Paul Schaub.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.pgpainless.util;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public final class CollectionUtils {

    private CollectionUtils() {

    }

    public static <I> List<I> iteratorToList(Iterator<I> iterator) {
        List<I> items = new ArrayList<>();
        while (iterator.hasNext()) {
            I item = iterator.next();
            items.add(item);
        }
        return items;
    }

    public static <T> T[] concat(T t, T[] ts) {
        T[] concat = (T[]) Array.newInstance(t.getClass(), ts.length + 1);
        concat[0] = t;
        System.arraycopy(ts, 0, concat, 1, ts.length);
        return concat;
    }
}