/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   https://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.
 *
 *   SPDX-License-Identifier: Apache-2.0
 */

package org.apache.jena.sparql.engine.binding.itr;

import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Objects;

/** Iterator of 4 objects */
class Itr4<X> implements Iterator<X> {
    private int idx;
    private final X elt1;
    private final X elt2;
    private final X elt3;
    private final X elt4;

    Itr4(X x1, X x2, X x3, X x4) {
        idx = 0;
        elt1 = Objects.requireNonNull(x1);
        elt2 = Objects.requireNonNull(x2);
        elt3 = Objects.requireNonNull(x3);
        elt4 = Objects.requireNonNull(x4);
    }

    @Override
    public boolean hasNext() {
        return idx < 4;
    }

    @Override
    public X next() {
        idx++;
        if ( idx == 1 ) return elt1;
        if ( idx == 2 ) return elt2;
        if ( idx == 3 ) return elt3;
        if ( idx == 4 ) return elt4;
        throw new NoSuchElementException();
    }
}
