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/*
 * Copyright 2021 EPAM Systems, Inc
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. 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 com.epam.deltix.util.collections;


import java.util.Collection;
import java.util.Iterator;

public abstract class ArraysComparator {

    public abstract int compare(A e1, B e2);

    public int          compare(Collection a, Collection b) {
        if (a == null)
            return b == null ? 0 : -1;
        else if (b == null)
            return 1;

        if (a.size() != b.size())
            return a.size() - b.size() > 0 ? 1 : -1;

        Iterator i1 = a.iterator();
        Iterator i2 = b.iterator();

        while (i1.hasNext() && i2.hasNext()) {
            int result = compare(i1.next(), i2.next());
            if (result != 0)
                return result;
        }

        return 0;
    }

    public int          compare(A[] a, B[] b) {
        if (a == null)
            return b == null ? 0 : -1;
        else if (b == null)
            return 1;

        if (a.length != b.length)
            return a.length - b.length > 0 ? 1 : -1;

        for (int i = 0; i < a.length; i++) {
            int result = compare(a[i], b[i]);
            if (result != 0)
                return result;
        }

        return 0;
    }
}