/** * Licensed under the Artistic License; you may not use this file * except in compliance with the License. * You may obtain a copy of the License at * *      http://displaytag.sourceforge.net/license.html * * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */package org.displaytag.util;import java.util.Iterator;import java.util.LinkedHashSet;import java.util.Set;import org.apache.commons.lang.StringUtils;import org.apache.commons.lang.UnhandledException;/** * Object used to contain html multiple attribute value (for the "class" attribute). * @author Fabrizio Giustina * @version $Revision: 1081 $ ($Author: fgiust $) */public class MultipleHtmlAttribute implements Cloneable{    /**     * Sets containing splitted attribute values.     */    private Set attributeSet;    /**     * Constructor for MultipleHtmlAttribute.     * @param attributeValue String     */    public MultipleHtmlAttribute(String attributeValue)    {        this.attributeSet = new LinkedHashSet();        addAllAttributesFromArray(StringUtils.split(attributeValue));    }    /**     * Adds attributes from an array.     * @param attributes Object[] Array containing attributes     */    private void addAllAttributesFromArray(String[] attributes)    {        if (attributes == null)        {            return;        }        // number of attributes to add        int length = attributes.length;        // add all the splitted attributes        for (int j = 0; j < length; j++)        {            // don't add if empty            if (!StringUtils.isEmpty(attributes[j]))            {                this.attributeSet.add(attributes[j]);            }        }    }    /**     * Returns the list of attributes separated by a space.     * @return String     */    public String toString()    {        StringBuffer buffer = new StringBuffer();        Iterator iterator = this.attributeSet.iterator();        while (iterator.hasNext())        {            // apend next value            buffer.append(iterator.next());            if (iterator.hasNext())            {                // append a space if there are more                buffer.append(' ');            }        }        return buffer.toString();    }    /**     * Adds a value to the attribute.     * @param attributeValue value to add to the attribute     */    public void addAttributeValue(String attributeValue)    {        // don't add if empty        if (!StringUtils.isEmpty(attributeValue))        {            this.attributeSet.add(attributeValue);        }    }    /**     * Return true if this MultipleHtmlValue doesn't store any value.     * @return <code>true</code> if this MultipleHtmlValue doesn't store any value     */    public boolean isEmpty()    {        return attributeSet.isEmpty();    }    /**     * @see java.lang.Object#clone()     */    protected Object clone()    {        MultipleHtmlAttribute clone;        try        {            clone = (MultipleHtmlAttribute) super.clone();        }        catch (CloneNotSupportedException e)        {            // should never happen            throw new UnhandledException(e);        }        // copy attributes        clone.addAllAttributesFromArray((String[]) this.attributeSet.toArray(new String[this.attributeSet.size()]));        return clone;    }}