LinkConverter.java

/*
 * Copyright (c) 2002-2020, Mairie de Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */

package fr.paris.lutece.plugins.botpress.service.renderers;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * LinkConverter
 */
public class LinkConverter implements Converter
{
    private static final String PATTERN_LINK = "\\[(.+?)\\]\\((.+?)\\)";
    private static final String PATTERN_URL = "\\((.+?)\\)";

    /**
     * {@inheritDoc }
     */
    @Override
    public String convert( String strInput )
    {
        Pattern pLink = Pattern.compile( PATTERN_LINK );
        Pattern pUrl = Pattern.compile( PATTERN_URL );
        Matcher matcher = pLink.matcher( strInput );
        StringBuffer sbOutput = new StringBuffer( );

        while ( matcher.find( ) )
        {
            String strLink = matcher.group( 0 );
            String strTitle = matcher.group( 1 );
            Matcher mUrl = pUrl.matcher( strLink );
            mUrl.find( );
            String strUrl = mUrl.group( 1 );
            String strAnchor = "<a href=\"" + strUrl + "\" target=\"_blank\" >" + strTitle + "</a>";
            matcher.appendReplacement( sbOutput, strAnchor );
        }
        matcher.appendTail( sbOutput );
        return sbOutput.toString( );
    }

}