org.roda.wui.common.client.widgets.wcag.WCAGUtilities.java Source code

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Here is the source code for org.roda.wui.common.client.widgets.wcag.WCAGUtilities.java

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/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE file at the root of the source
 * tree and available online at
 *
 * https://github.com/keeps/roda
 */
package org.roda.wui.common.client.widgets.wcag;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.user.client.Random;

public class WCAGUtilities {

    private static final Set<String> INPUT_TAGNAMES = new HashSet<>(Arrays.asList("INPUT", "SELECT"));
    private static final String IMG_TAGNAME = "img";

    private static WCAGUtilities instance = null;

    public void makeAccessible(Element element) {
        String alignAttribute = element.getAttribute("align");

        if (alignAttribute != null) {
            String className;
            if ("right".equals(alignAttribute)) {
                className = "alignRight";
            } else if ("left".equals(alignAttribute)) {
                className = "alignLeft";
            } else if ("center".equals(alignAttribute)) {
                className = "alignCenter";
            } else {
                className = "alignJustify";
            }
            element.removeAttribute("align");
            element.addClassName(className);
        }

        if (INPUT_TAGNAMES.contains(element.getTagName())) {
            addAttributeIfNonExistent(element, "title", "t_" + Random.nextInt(1000));
        }

        if (IMG_TAGNAME.equalsIgnoreCase(element.getTagName())) {
            addAttributeIfNonExistent(element, "alt", "img_" + Random.nextInt(10000));
        }

        if (element.getChildCount() > 0) {
            for (int i = 0; i < element.getChildCount(); i++) {
                if (element.getChild(i).getNodeType() == Node.ELEMENT_NODE) {
                    makeAccessible((Element) element.getChild(i));
                }
            }
        }

    }

    public static WCAGUtilities getInstance() {
        if (instance == null) {
            instance = new WCAGUtilities();
        }
        return instance;
    }

    public static void addAttributeIfNonExistent(Element element, String attributeName, String attributeValue) {
        if (element.getAttribute(attributeName) == null || "".equals(element.getAttribute(attributeName))) {
            element.setAttribute(attributeName, attributeValue);
        }
    }
}