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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
There is a newer version: 1.1.4
/*
 * {{{ header & license
 * Copyright (c) 2007 Wisconsin Court System
 *
 * This program 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 2.1
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * }}}
 */
package com.openhtmltopdf.newtable;

import com.openhtmltopdf.css.constants.IdentValue;
import com.openhtmltopdf.css.parser.FSColor;
import com.openhtmltopdf.css.style.derived.BorderPropertySet;

/**
 * This class encapsulates all information related to a particular border side
 * along with an overall precedence (e.g. cell borders take precendence over
 * row borders).  It is used when comparing overlapping borders when calculating
 * collapsed borders.
 */
public class CollapsedBorderValue {  
    private IdentValue _style;
    private int _width;
    private FSColor _color;
    private int _precedence;
    
    public CollapsedBorderValue(IdentValue style, int width, FSColor color, int precedence) {
        _style = style;
        _width = width;
        _color = color;
        _precedence = precedence;
    }

    public FSColor color() {
        return _color;
    }

    public void setColor(FSColor color) {
        _color = color;
    }

    public IdentValue style() {
        return _style;
    }

    public void setStyle(IdentValue style) {
        _style = style;
    }

    public int width() {
        return _width;
    }

    public void setWidth(int width) {
        _width = width;
    }

    public int precedence() {
        return _precedence;
    }

    public void setPrecedence(int precedence) {
        _precedence = precedence;
    }
    
    public boolean defined() {
        return _style != null;
    }
    
    public boolean exists() {
        return _style != null && _style != IdentValue.NONE && _style != IdentValue.HIDDEN;
    }
    
    public boolean hidden() {
        return _style == IdentValue.HIDDEN;
    }
    
    public static CollapsedBorderValue borderLeft(BorderPropertySet border, int precedence) {
        return new CollapsedBorderValue(
                border.leftStyle(), (int)border.left(), border.leftColor(), precedence);
    }
    
    public static CollapsedBorderValue borderRight(BorderPropertySet border, int precedence) {
        return new CollapsedBorderValue(
                border.rightStyle(), (int)border.right(), border.rightColor(), precedence);
    }
    
    public static CollapsedBorderValue borderTop(BorderPropertySet border, int precedence) {
        return new CollapsedBorderValue(
                border.topStyle(), (int)border.top(), border.topColor(), precedence);
    }

    public static CollapsedBorderValue borderBottom(BorderPropertySet border, int precedence) {
        return new CollapsedBorderValue(
                border.bottomStyle(), (int)border.bottom(), border.bottomColor(), precedence);
    }
}