com.yukthi.excel.exporter.InternalWorkbook.java Source code

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Here is the source code for com.yukthi.excel.exporter.InternalWorkbook.java

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/*
 * The MIT License (MIT)
 * Copyright (c) 2016 "Yukthi Techsoft Pvt. Ltd." (http://yukthi-tech.co.in)
    
 * 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 com.yukthi.excel.exporter;

import java.awt.Color;
import java.util.HashMap;
import java.util.Map;

import org.apache.poi.hssf.record.PaletteRecord;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

/**
 * Wrapper over internal workbook
 * 
 * @author akiran
 */
public class InternalWorkbook {
    /**
     * Actual workbook
     */
    private HSSFWorkbook workbook;

    /**
     * Index at which next color needs to be added
     */
    private short nextColorIndex = PaletteRecord.FIRST_COLOR_INDEX;

    /**
     * Color to index mapping
     */
    private Map<Color, Integer> colorToIndex = new HashMap<>();

    public InternalWorkbook(HSSFWorkbook workbook) {
        this.workbook = workbook;
    }

    /**
     * @return the {@link #workbook workbook}
     */
    public HSSFWorkbook getWorkbook() {
        return workbook;
    }

    /**
     * Gets the index of specified color in the current workbook
     * 
     * @param color
     * @return
     */
    public HSSFColor getColor(Color color) {
        Integer index = colorToIndex.get(color);
        HSSFPalette palette = workbook.getCustomPalette();

        // if color was already added get color based on found index
        if (index != null) {
            return palette.getColor(index);
        }

        //add color to the workbook and return the same
        HSSFColor hssfColor = null;

        try {
            palette.setColorAtIndex(nextColorIndex, (byte) color.getRed(), (byte) color.getGreen(),
                    (byte) color.getBlue());
            hssfColor = palette.getColor(nextColorIndex);

            nextColorIndex++;
        } catch (Exception ex) {
            throw new IllegalStateException("An error occurred while adding color to workbook", ex);
        }

        return hssfColor;
    }
}