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DynamicReports is an open source Java reporting library based on JasperReports. It allows to create dynamic report designs and it doesn't need a visual report designer. You can very quickly create reports and produce documents that can be displayed, printed or exported into many popular formats such as PDF, Excel, Word and others.
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/**
 * DynamicReports - Free Java reporting library for creating reports dynamically
 *
 * Copyright (C) 2010 - 2016 Ricardo Mariaca
 * http://www.dynamicreports.org
 *
 * This file is part of DynamicReports.
 *
 * DynamicReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * DynamicReports 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with DynamicReports. If not, see .
 */

package net.sf.dynamicreports.design.transformation;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import net.sf.dynamicreports.design.base.style.DRDesignBaseStyle;
import net.sf.dynamicreports.design.base.style.DRDesignBorder;
import net.sf.dynamicreports.design.base.style.DRDesignConditionalStyle;
import net.sf.dynamicreports.design.base.style.DRDesignFont;
import net.sf.dynamicreports.design.base.style.DRDesignPadding;
import net.sf.dynamicreports.design.base.style.DRDesignParagraph;
import net.sf.dynamicreports.design.base.style.DRDesignPen;
import net.sf.dynamicreports.design.base.style.DRDesignStyle;
import net.sf.dynamicreports.design.base.style.DRDesignTabStop;
import net.sf.dynamicreports.design.constant.DefaultStyleType;
import net.sf.dynamicreports.design.definition.style.DRIDesignStyle;
import net.sf.dynamicreports.design.definition.style.DRIDesignTabStop;
import net.sf.dynamicreports.design.exception.DRDesignReportException;
import net.sf.dynamicreports.report.base.style.DRBaseStyle;
import net.sf.dynamicreports.report.base.style.DRBorder;
import net.sf.dynamicreports.report.base.style.DRFont;
import net.sf.dynamicreports.report.base.style.DRPadding;
import net.sf.dynamicreports.report.base.style.DRParagraph;
import net.sf.dynamicreports.report.base.style.DRPen;
import net.sf.dynamicreports.report.definition.style.DRIBaseStyle;
import net.sf.dynamicreports.report.definition.style.DRIBorder;
import net.sf.dynamicreports.report.definition.style.DRIConditionalStyle;
import net.sf.dynamicreports.report.definition.style.DRIFont;
import net.sf.dynamicreports.report.definition.style.DRIPadding;
import net.sf.dynamicreports.report.definition.style.DRIParagraph;
import net.sf.dynamicreports.report.definition.style.DRIPen;
import net.sf.dynamicreports.report.definition.style.DRIReportStyle;
import net.sf.dynamicreports.report.definition.style.DRIStyle;
import net.sf.dynamicreports.report.definition.style.DRITabStop;
import net.sf.dynamicreports.report.definition.style.DRITemplateStyle;
import net.sf.dynamicreports.report.exception.DRException;

import org.apache.commons.lang3.StringUtils;

/**
 * @author Ricardo Mariaca ([email protected])
 */
public class StyleTransform {
	private DesignTransformAccessor accessor;
	private Map styles;
	private Map designStyles;
	private Map templateStyles;

	public StyleTransform(DesignTransformAccessor accessor) {
		this.accessor = accessor;
		init();
	}

	private void init() {
		styles = new LinkedHashMap();
		designStyles = new HashMap();
		templateStyles = accessor.getTemplateTransform().getTemplateStyles();
	}

	private DRDesignStyle transformStyle(DRIReportStyle style, boolean textStyle) throws DRException {
		return transformStyle(style, textStyle, DefaultStyleType.NONE);
	}

	protected DRDesignStyle transformStyle(DRIReportStyle style, boolean textStyle, DefaultStyleType defaultStyleType) throws DRException {
		if (style == null) {
			return getDefaultStyle(defaultStyleType);
		}
		String styleName = style.hashCode() + "_" + textStyle;
		if (designStyles.containsKey(styleName)) {
			return designStyles.get(styleName);
		}

		DRDesignStyle designStyle = style(getStyle(style), textStyle, defaultStyleType);
		if (textStyle) {
			if (StyleResolver.getFontName(designStyle) == null) {
				designStyle.getFont().setFontName(accessor.getTemplateTransform().getDefaultFontName());
			}
			if (StyleResolver.getFontSize(designStyle) == null) {
				designStyle.getFont().setFontSize(accessor.getTemplateTransform().getDefaultFontSize());
			}
			if (StyleResolver.getFontBold(designStyle) == null) {
				designStyle.getFont().setBold(accessor.getTemplateTransform().getDefaultFontBold());
			}
			if (StyleResolver.getFontItalic(designStyle) == null) {
				designStyle.getFont().setItalic(accessor.getTemplateTransform().getDefaultFontItalic());
			}
			if (StyleResolver.getFontUnderline(designStyle) == null) {
				designStyle.getFont().setUnderline(accessor.getTemplateTransform().getDefaultFontUnderline());
			}
			if (StyleResolver.getFontStrikeThrough(designStyle) == null) {
				designStyle.getFont().setStrikeThrough(accessor.getTemplateTransform().getDefaultFontStrikeThrough());
			}
			if (StyleResolver.getPdfFontName(designStyle) == null) {
				designStyle.getFont().setPdfFontName(accessor.getTemplateTransform().getDefaultFontPdfFontName());
			}
			if (StyleResolver.getPdfEncoding(designStyle) == null) {
				designStyle.getFont().setPdfEncoding(accessor.getTemplateTransform().getDefaultFontPdfEncoding());
			}
			if (StyleResolver.getPdfEmbedded(designStyle) == null) {
				designStyle.getFont().setPdfEmbedded(accessor.getTemplateTransform().getDefaultFontPdfEmbedded());
			}
		}
		addStyle(styleName, designStyle);
		return designStyle;
	}

	protected DRDesignFont transformFont(DRIFont font) {
		if (font == null) {
			return null;
		}

		DRDesignFont designFont = new DRDesignFont();
		designFont.setFontName(font.getFontName());
		designFont.setFontSize(font.getFontSize());
		designFont.setBold(font.getBold());
		designFont.setItalic(font.getItalic());
		designFont.setUnderline(font.getUnderline());
		designFont.setStrikeThrough(font.getStrikeThrough());
		designFont.setPdfFontName(font.getPdfFontName());
		designFont.setPdfEncoding(font.getPdfEncoding());
		designFont.setPdfEmbedded(font.getPdfEmbedded());
		return designFont;
	}

	private DRDesignStyle style(DRIStyle style, boolean textStyle, DefaultStyleType defaultStyleType) throws DRException {
	  final DRDesignStyle designStyle;
	  if (StringUtils.isBlank(style.getName())) {
      designStyle = new DRDesignStyle();
	  } else {
	    designStyle = new DRDesignStyle(style.getName());
	  }
		baseStyle(designStyle, style);
		if (style.getParentStyle() != null) {
			designStyle.setParentStyle(transformStyle(style.getParentStyle(), textStyle, defaultStyleType));
		}
		for (DRIConditionalStyle conditionalStyle : style.getConditionalStyles()) {
			designStyle.addConditionalStyle(conditionalStyle(conditionalStyle));
		}
		return designStyle;
	}

	protected DRIStyle getStyle(DRIReportStyle reportStyle) {
		if (reportStyle == null) {
			return null;
		}
		if (reportStyle instanceof DRIStyle) {
			return (DRIStyle) reportStyle;
		}
		if (reportStyle instanceof DRITemplateStyle) {
			String name = ((DRITemplateStyle) reportStyle).getName();
			DRIStyle style = templateStyles.get(name);
			if (style == null) {
				throw new DRDesignReportException("Template style " + name + " not found");
			}
			return style;
		}
		throw new DRDesignReportException("Style " + reportStyle.getClass().getName() + " not supported");
	}

	public void transformTemplateStyles() throws DRException {
		for (DRIStyle style : templateStyles.values()) {
			if (styles.containsKey(style.getName())) {
				continue;
			}
			transformStyle(style, false);
		}
	}

	private DRDesignConditionalStyle conditionalStyle(DRIConditionalStyle conditionalStyle) throws DRException {
		DRDesignConditionalStyle designConditionalStyle = new DRDesignConditionalStyle();
		baseStyle(designConditionalStyle, conditionalStyle);
		designConditionalStyle.setConditionExpression(accessor.getExpressionTransform().transformExpression(conditionalStyle.getConditionExpression()));
		designConditionalStyle.setDataset(accessor.getExpressionTransform().getDataset());
		return designConditionalStyle;
	}

	private void baseStyle(DRDesignBaseStyle designBaseStyle, DRIBaseStyle baseStyle) throws DRException {
		designBaseStyle.setForegroundColor(baseStyle.getForegroundColor());
		designBaseStyle.setBackgroundColor(baseStyle.getBackgroundColor());
		designBaseStyle.setRadius(baseStyle.getRadius());
		designBaseStyle.setImageScale(baseStyle.getImageScale());
		designBaseStyle.setHorizontalImageAlignment(baseStyle.getHorizontalImageAlignment());
		designBaseStyle.setVerticalImageAlignment(baseStyle.getVerticalImageAlignment());
		designBaseStyle.setHorizontalTextAlignment(baseStyle.getHorizontalTextAlignment());
		designBaseStyle.setVerticalTextAlignment(baseStyle.getVerticalTextAlignment());
		designBaseStyle.setBorder(border(baseStyle.getBorder()));
		designBaseStyle.setPadding(padding(baseStyle.getPadding()));
		designBaseStyle.setFont(transformFont(baseStyle.getFont()));
		designBaseStyle.setRotation(baseStyle.getRotation());
		designBaseStyle.setPattern(baseStyle.getPattern());
		designBaseStyle.setMarkup(baseStyle.getMarkup());
		designBaseStyle.setParagraph(paragraph(baseStyle.getParagraph()));
		designBaseStyle.setLinePen(pen(baseStyle.getLinePen()));
	}

	private DRDesignParagraph paragraph(DRIParagraph paragraph) {
		DRDesignParagraph designParagraph = new DRDesignParagraph();
		designParagraph.setLineSpacing(paragraph.getLineSpacing());
		designParagraph.setLineSpacingSize(paragraph.getLineSpacingSize());
		designParagraph.setFirstLineIndent(paragraph.getFirstLineIndent());
		designParagraph.setLeftIndent(paragraph.getLeftIndent());
		designParagraph.setRightIndent(paragraph.getRightIndent());
		designParagraph.setSpacingBefore(paragraph.getSpacingBefore());
		designParagraph.setSpacingAfter(paragraph.getSpacingAfter());
		designParagraph.setTabStopWidth(paragraph.getTabStopWidth());
		List designTabStops = new ArrayList();
		for (DRITabStop tabStop : paragraph.getTabStops()) {
			DRDesignTabStop designTabStop = new DRDesignTabStop();
			designTabStop.setPosition(tabStop.getPosition());
			designTabStop.setAlignment(tabStop.getAlignment());
			designTabStops.add(designTabStop);
		}
		designParagraph.setTabStops(designTabStops);
		return designParagraph;
	}

	private DRDesignBorder border(DRIBorder border) {
		DRDesignBorder designBorder = new DRDesignBorder();
		designBorder.setTopPen(pen(border.getTopPen()));
		designBorder.setLeftPen(pen(border.getLeftPen()));
		designBorder.setBottomPen(pen(border.getBottomPen()));
		designBorder.setRightPen(pen(border.getRightPen()));
		return designBorder;
	}

	private DRDesignPadding padding(DRIPadding padding) {
		DRDesignPadding designPadding = new DRDesignPadding();
		designPadding.setTop(padding.getTop());
		designPadding.setLeft(padding.getLeft());
		designPadding.setBottom(padding.getBottom());
		designPadding.setRight(padding.getRight());
		return designPadding;
	}

	protected DRDesignPen pen(DRIPen pen) {
		if (pen == null) {
			return null;
		}
		DRDesignPen designPen = new DRDesignPen();
		designPen.setLineWidth(pen.getLineWidth());
		designPen.setLineStyle(pen.getLineStyle());
		designPen.setLineColor(pen.getLineColor());
		return designPen;
	}

	protected DRDesignStyle getDefaultStyle(DefaultStyleType defaultStyleType) throws DRException {
		TemplateTransform templateTransform = accessor.getTemplateTransform();
		switch (defaultStyleType) {
		case NONE:
			return null;
		case TEXT:
			return transformStyle(templateTransform.getTextStyle(), true);
		case COLUMN:
			return transformStyle(templateTransform.getColumnStyle(true), true);
		case COLUMN_TITLE:
			return transformStyle(templateTransform.getColumnTitleStyle(), true);
		case GROUP:
			return transformStyle(templateTransform.getGroupStyle(), true);
		case GROUP_TITLE:
			return transformStyle(templateTransform.getGroupTitleStyle(), true);
		case SUBTOTAL:
			return transformStyle(templateTransform.getSubtotalStyle(), true);
		case IMAGE:
			return transformStyle(templateTransform.getImageStyle(), false);
		case CHART:
			return transformStyle(templateTransform.getChartStyle(), false);
		case BARCODE:
			return transformStyle(templateTransform.getBarcodeStyle(), false);
		default:
			throw new DRDesignReportException("Default style type " + defaultStyleType.name() + " not supported");
		}
	}

	private void addStyle(String styleName, DRDesignStyle designStyle) {
		if (designStyle == null) {
			return;
		}
		if (styles.containsKey(designStyle.getName())) {
			if (!styles.get(designStyle.getName()).equals(designStyle)) {
				throw new DRDesignReportException("Duplicate declaration of style \"" + designStyle.getName() + "\"");
			}
			return;
		}
		styles.put(designStyle.getName(), designStyle);
		designStyles.put(styleName, designStyle);
	}

	public void copyStyle(DRBaseStyle toStyle, DRIBaseStyle fromStyle) {
		toStyle.setForegroundColor(fromStyle.getForegroundColor());
		toStyle.setBackgroundColor(fromStyle.getBackgroundColor());
		toStyle.setRadius(fromStyle.getRadius());
		toStyle.setImageScale(fromStyle.getImageScale());
		toStyle.setHorizontalImageAlignment(fromStyle.getHorizontalImageAlignment());
		toStyle.setVerticalImageAlignment(fromStyle.getVerticalImageAlignment());
		toStyle.setHorizontalTextAlignment(fromStyle.getHorizontalTextAlignment());
		toStyle.setVerticalTextAlignment(fromStyle.getVerticalTextAlignment());
		toStyle.setBorder((DRBorder) fromStyle.getBorder());
		toStyle.setPadding((DRPadding) fromStyle.getPadding());
		toStyle.setFont((DRFont) fromStyle.getFont());
		toStyle.setRotation(fromStyle.getRotation());
		toStyle.setPattern(fromStyle.getPattern());
		toStyle.setMarkup(fromStyle.getMarkup());
		toStyle.setParagraph((DRParagraph) fromStyle.getParagraph());
		toStyle.setLinePen((DRPen) fromStyle.getLinePen());
	}

	public Collection getStyles() {
		return styles.values();
	}
}