/*
 * Copyright 2006-2014 the original author or authors.
 *
 * Licensed 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.
 */
package org.springframework.batch.item.excel.support.rowset;

import org.springframework.batch.item.excel.Sheet;

/**
 * Default implementation for the {@code RowSetMetaData} interface.
 *
 * Requires a {@code Sheet} and {@code ColumnNameExtractor} to operate correctly.
 * Delegates the retrieval of the column names to the {@code ColumnNameExtractor}.
 *
 * @author Marten Deinum
 * @since 0.5.0
 */
public class DefaultRowSetMetaData implements RowSetMetaData {

    private final Sheet sheet;

    private ColumnNameExtractor columnNameExtractor;

    DefaultRowSetMetaData(Sheet sheet) {
        this.sheet = sheet;
    }

    @Override
    public String[] getColumnNames() {
        return columnNameExtractor.getColumnNames(sheet);
    }

    @Override
    public String getColumnName(int idx) {
        String[] names = getColumnNames();
        return names[idx];
    }

    @Override
    public int getColumnCount() {
        return sheet.getNumberOfColumns();
    }

    @Override
    public String getSheetName() {
        return sheet.getName();
    }

    public void setColumnNameExtractor(ColumnNameExtractor columnNameExtractor) {
        this.columnNameExtractor = columnNameExtractor;
    }
}
