/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.internal.batchimport.input.csv;

import java.io.IOException;
import org.neo4j.csv.reader.Chunker;
import org.neo4j.csv.reader.Source;
import org.neo4j.internal.batchimport.input.InputEntity;
import org.neo4j.internal.batchimport.input.InputEntityVisitor;

class EagerCsvInputChunk implements CsvInputChunk, Source.Chunk {
    private InputEntity[] entities;
    private int cursor;

    void initialize(InputEntity[] entities) {
        this.entities = entities;
        this.cursor = 0;
    }

    @Override
    public boolean next(InputEntityVisitor visitor) throws IOException {
        if (cursor < entities.length) {
            entities[cursor++].replayOnto(visitor);
            return true;
        }
        return false;
    }

    @Override
    public void close() {}

    @Override
    public boolean fillFrom(Chunker chunker) throws IOException {
        return chunker.nextChunk(this);
    }

    @Override
    public char[] data() {
        throw new UnsupportedOperationException();
    }

    @Override
    public int length() {
        throw new UnsupportedOperationException();
    }

    @Override
    public int maxFieldSize() {
        throw new UnsupportedOperationException();
    }

    @Override
    public String sourceDescription() {
        throw new UnsupportedOperationException();
    }

    @Override
    public int startPosition() {
        throw new UnsupportedOperationException();
    }

    @Override
    public int backPosition() {
        throw new UnsupportedOperationException();
    }
}
