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/*
 * 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 com.aliyun.odps.table.read.split.impl;

import com.aliyun.odps.table.read.split.InputSplit;
import com.aliyun.odps.table.read.split.InputSplitAssigner;

public class IndexedInputSplitAssigner implements InputSplitAssigner {

    private final int totalSplitCount;

    private final String sessionId;

    public IndexedInputSplitAssigner(String sessionId,
                                     int totalSplitCount) {
        this.sessionId = sessionId;
        this.totalSplitCount = totalSplitCount;
    }

    @Override
    public int getSplitsCount() {
        return totalSplitCount;
    }

    @Override
    public InputSplit getSplit(int index) {
        if (index >= this.totalSplitCount) {
            throw new IllegalArgumentException("Index of input split exceed max count");
        }
        return new IndexedInputSplit(sessionId, index);
    }

    @Override
    public InputSplit[] getAllSplits() {
        InputSplit[] splits = new IndexedInputSplit[totalSplitCount];
        for (int i = 0; i < this.totalSplitCount; i++) {
            splits[i] = new IndexedInputSplit(sessionId, i);
        }
        return splits;
    }
}