uk.co.certait.htmlexporter.css.StyleMap.java Source code

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Here is the source code for uk.co.certait.htmlexporter.css.StyleMap.java

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/**
 * Copyright (C) 2012 alanhay <alanhay99@hotmail.com>
 *
 * 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
 *
 *         http://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 uk.co.certait.htmlexporter.css;

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

import org.apache.commons.lang.StringUtils;
import org.jsoup.nodes.Element;

import com.osbcp.cssparser.CSSParser;
import com.osbcp.cssparser.Rule;

/**
 * 
 * @author alanhay
 * 
 */
public class StyleMap {
    private static final String CLASS_PREFIX = ".";

    Map<String, Style> styles;
    private StyleGenerator generator;

    public StyleMap(Map<String, Style> styles) {
        this.styles = styles != null ? styles : new HashMap<String, Style>();
        generator = new StyleGenerator();
    }

    public Style getStyleForElement(Element element) {
        Style style = new Style();

        if (getStyleForTag(element) != null) {
            style = StyleMerger.mergeStyles(style, getStyleForTag(element));
        }

        if (!getStylesForClass(element).isEmpty()) {
            List<Style> classStyles = getStylesForClass(element);

            for (Style classStyle : classStyles) {
                style = StyleMerger.mergeStyles(style, classStyle);
            }
        }

        if (getInlineStyle(element) != null) {
            style = StyleMerger.mergeStyles(style, getInlineStyle(element));
        }

        return style;
    }

    private Style getStyleForTag(Element element) {
        return styles.get(element.tagName());
    }

    private List<Style> getStylesForClass(Element element) {
        List<Style> classStyles = new ArrayList<Style>();

        if (StringUtils.isNotEmpty(element.className())) {
            String[] classNames = element.className().split(" ");

            for (String className : classNames) {
                String qualifiedClassName = CLASS_PREFIX + className.trim();

                if (styles.containsKey(qualifiedClassName)) {
                    classStyles.add(styles.get(qualifiedClassName));
                }
            }
        }

        return classStyles;
    }

    private Style getInlineStyle(Element element) {
        Style style = null;

        if (element.hasAttr("style")) {
            List<Rule> inlineRules;
            try {
                String inlineStyle = element.attr("style").endsWith(";") ? element.attr("style")
                        : element.attr("style") + ";";
                inlineRules = CSSParser.parse("x{" + inlineStyle + "}");
            } catch (Exception e) {
                throw new RuntimeException("Error parsing inline style for element " + element.tagName());
            }

            style = generator.createStyle(inlineRules.get(0), inlineRules.get(0).getSelectors().get(0));
        }

        return style;
    }
}