com.edgenius.wiki.render.impl.LinkReplacerFilter.java Source code

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Here is the source code for com.edgenius.wiki.render.impl.LinkReplacerFilter.java

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/* 
 * =============================================================
 * Copyright (C) 2007-2011 Edgenius (http://www.edgenius.com)
 * =============================================================
 * License Information: http://www.edgenius.com/licensing/edgenius/2.0/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2.0
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * http://www.gnu.org/licenses/gpl.txt
 *  
 * ****************************************************************
 */
package com.edgenius.wiki.render.impl;

import java.util.regex.MatchResult;

import org.apache.commons.lang.StringUtils;

import com.edgenius.wiki.WikiConstants;
import com.edgenius.wiki.gwt.client.model.LinkModel;
import com.edgenius.wiki.render.RenderContext;
import com.edgenius.wiki.render.filter.LinkFilter;

/**
 * A special filter only for change link information in text. This method must
 * call after an EscapeFilter.
 * @author Dapeng.Ni
 */
public class LinkReplacerFilter extends LinkFilter {

    //TODO: not finished....
    @Override
    public void replace(StringBuffer buffer, MatchResult result, RenderContext context) {
        LinkModel link = getLinkModel(result, context.getCurrentRegion());
        LinkReplacer replacer = (LinkReplacer) context.getGlobalParam(LinkReplacer.class.getName());

        if (replacer.getType() == WikiConstants.AUTO_FIX_COPY_LINK) {
            //change spaceUname: append @spaceUname after link
            if (StringUtils.isBlank(link.getSpaceUname())
                    || StringUtils.equals(link.getSpaceUname(), replacer.getFromSpaceUname())) {
                buffer.append(getLink(replacer.getFromSpaceUname(), link));
                return;
            }
        } else if (replacer.getType() == WikiConstants.AUTO_FIX_TITLE_CHANGE_LINK) {
            //change pageTitle: change old title to new one

            //link has not assign space, then from(content's space) must be same with the space of updated title page 
            if (((StringUtils.isBlank(link.getSpaceUname())
                    && StringUtils.equalsIgnoreCase(replacer.getFromSpaceUname(), replacer.getToSpaceUname()))
                    //if assigned space, then it must be same with the space of updated title page
                    || StringUtils.equalsIgnoreCase(link.getSpaceUname(), replacer.getToSpaceUname()))
                    //title must be same
                    && StringUtils.equalsIgnoreCase(StringUtils.trim(link.getLink()),
                            StringUtils.trim(replacer.getOldTitle()))) {
                link.setLink(replacer.getNewTitle());
                buffer.append(getLink(null, link));
                return;
            }
        }

        String body;
        //append original text if no change
        if (context.getCurrentRegion() != null) {
            body = context.getCurrentRegion().getBody();
        } else {
            body = result.group(0);
        }

        buffer.append(body);

    }

    @Override
    public String getPatternKey() {
        return null;
    }

    private String getLink(String spaceUname, LinkModel link) {

        String anchor = link.getAnchor() == null ? "" : "#" + link.getAnchor();
        String space;
        if (spaceUname == null) {
            //keep original spaceUname if has
            space = StringUtils.isBlank(link.getSpaceUname()) ? "" : "@" + link.getSpaceUname();
        } else {
            //at this case, replacer.toSpaceUname must different with replacer.fromSpaceUname, so always append @spaceUname
            space = "@" + spaceUname;
        }
        return "[" + link.getView() + ">" + link.getLink() + anchor + space + "]";
    }

}