/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Almex
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

package org.springframework.batch.item.resource;

import org.springframework.batch.item.ItemStreamException;

/**
 * Implementation of a {@link ResourceLocator} simply counting read/written items.
 *
 * @author Almex
 * @since 2.0
 */
public class CountingItemResourceLocator<T> implements ResourceLocator<T> {

    private int maxItemCount = Integer.MAX_VALUE;
    private int rowsToSkip = 0;

    @Override
    public void onOpen(ResourceContext context) throws ItemStreamException {
        context.setRowsToSkip(rowsToSkip);
    }

    @Override
    public void onWrite(T item, ResourceContext context) throws Exception {
        context.incrementIndex();
    }

    @Override
    public void onRead(T item, ResourceContext context) throws Exception {
        context.incrementIndex();
    }

    protected int getMaxItemIndex() {
        return maxItemCount + rowsToSkip;
    }

    public void setMaxItemCount(int maxItemCount) {
        this.maxItemCount = maxItemCount;
    }

    public void setRowsToSkip(int rowsToSkip) {
        this.rowsToSkip = rowsToSkip;
    }
}
