ValidationStyleGroupBehavior.java

package org.nocket.component.form.behaviors;

import org.apache.wicket.Component;
import org.apache.wicket.feedback.FeedbackMessage;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.markup.transformer.AbstractTransformerBehavior;
import org.apache.wicket.util.iterator.ComponentHierarchyIterator;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
import org.nocket.component.form.ComponentGroup;
import org.nocket.component.select.DMDRadioChoice;

// TODO: Auto-generated Javadoc
/**
 * This behavior adds to a group of the components a paragraph with error
 * messages coming from these components.
 * 
 * @author blaz02
 * 
 */
public class ValidationStyleGroupBehavior extends AbstractTransformerBehavior {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /** The Constant BR. */
    private final static String BR = "<br/>";
    
    /** The Constant BEFORE_MESSAGE. */
    private final static String BEFORE_MESSAGE = "<p class=\"error\">";
    
    /** The Constant BEFORE_CS. */
    private final static String BEFORE_CS = "<div class=\"control-group error\">";
    
    /** The Constant AFTER_MESSAGE. */
    private final static String AFTER_MESSAGE = "</p>";
    
    /** The Constant AFTER_CS. */
    private final static String AFTER_CS = "</div>";

    /* (non-Javadoc)
     * @see org.apache.wicket.markup.transformer.AbstractTransformerBehavior#transform(org.apache.wicket.Component, java.lang.CharSequence)
     */
    @Override
    public CharSequence transform(Component component, CharSequence cs) {
        boolean added = false;
        StringBuffer messageBuffer = new StringBuffer(BEFORE_MESSAGE);
        boolean isRadioOrCheckbox = false;
        ComponentHierarchyIterator it = ((ComponentGroup) component).visitChildren(FormComponent.class);
        for (Component n : it) {
            FormComponent<?> fc = (FormComponent<?>) n;
            if (!fc.isValid()) {
                if (fc instanceof DMDRadioChoice<?>) {
                    isRadioOrCheckbox = true;
                }
                for (FeedbackMessage message : fc.getFeedbackMessages()) {
                    message.markRendered();
                    if (added) {
                        messageBuffer.append(BR);
                    }
                    messageBuffer.append(message.getMessage());
                    added = true;
                }
            }
        }

        if (!added) {
            return cs;
        }

        messageBuffer.append(AFTER_MESSAGE);

        StringBuffer b;
        if (isRadioOrCheckbox) {
            b = buildOutputForRadioOrCheckbox(cs, messageBuffer);
        } else {
            b = buildOutput(cs, messageBuffer);
        }
        return b.toString();
    }

    /**
     * Wenn Radios und Checkboxen mit Wicket und Bootstrap verwendet werden,
     * darf der Fehlertext nicht wie bei den einzelnen Inputfeldern hinten
     * angefÃŒgt werden, sondern er muss in das Controls-Div hinein operiert.
     * werden
     * 
     * <pre>
     *             <div class="control-group error">
     *                     <div wicket:id="genderGroup" class="radio-checkbox-group"><wicket:border>
     *                         <wicket:body>
     *                             <div class="controls">
     *                                 <label class="radio" wicket:id="gender" id="gender">
     *                                     <input name="memberpanel:personDataPanel:genderGroup:genderGroup_body:gender" type="radio" value="HERR" id="gender-HERR"/>
     *                                     <label for="gender-HERR">Man</label>
     *                                     <input name="memberpanel:personDataPanel:genderGroup:genderGroup_body:gender" type="radio" value="FRAU" id="gender-FRAU"/>
     *                                     <label for="gender-FRAU">Woman</label>
     *                                 </label> 
     *                                 HIER MUSS ES HIN
     *                             </div>
     *                         </wicket:body>
     *                     </wicket:border>
     *                 </div>
     * 
     * </pre>
     *
     * @param cs            vorhandener HTML-Code
     * @param messageBuffer            Fehlertexte
     * @return the string buffer
     */
    private StringBuffer buildOutputForRadioOrCheckbox(CharSequence cs, StringBuffer messageBuffer) {
        StringBuffer b = new StringBuffer(BEFORE_CS);

        Document document = Jsoup.parse(cs.toString());
        Elements divControls = document.select("div[class*=controls]");

        if (divControls == null) {
            return buildOutput(cs, messageBuffer);
        }

        divControls.first().append(messageBuffer.toString());
        b.append(document.html());

        b.append(AFTER_CS);
        return b;
    }

    /**
     * Builds the output.
     *
     * @param cs the cs
     * @param messageBuffer the message buffer
     * @return the string buffer
     */
    private StringBuffer buildOutput(CharSequence cs, StringBuffer messageBuffer) {
        StringBuffer b = new StringBuffer(BEFORE_CS).append(cs);
        b.append(messageBuffer);
        b.append(AFTER_CS);
        return b;
    }

}