/*
 * 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
 *
 *     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.apache.flink.ml.builder;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * The TableId is necessary to pass the inputs/outputs of various API calls across the nodes of
 * Graph and GraphModel.
 */
public class TableId {
    public final int id;

    public TableId(int id) {
        this.id = id;
    }

    public static List<Integer> toList(TableId[] tableIds) {
        List<Integer> result = new ArrayList<>(tableIds.length);
        for (int i = 0; i < tableIds.length; i++) {
            result.add(tableIds[i].id);
        }
        return result;
    }

    public static TableId[] fromList(List<Integer> tableIds) {
        TableId[] result = new TableId[tableIds.size()];
        for (int i = 0; i < tableIds.size(); i++) {
            result[i] = new TableId(tableIds.get(i));
        }
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof TableId)) {
            return false;
        }
        TableId other = (TableId) obj;
        return id == other.id;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(id);
    }

    @Override
    public String toString() {
        return "TableId(" + id + ")";
    }
}
