com.edgenius.wiki.render.filter.UserFilter.java Source code

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Here is the source code for com.edgenius.wiki.render.filter.UserFilter.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.filter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;

import com.edgenius.core.util.AuditLogger;
import com.edgenius.wiki.gwt.client.html.HTMLNode;
import com.edgenius.wiki.gwt.client.model.LinkModel;
import com.edgenius.wiki.gwt.client.server.utils.NameConstants;
import com.edgenius.wiki.render.ImmutableContentFilter;
import com.edgenius.wiki.render.Region;
import com.edgenius.wiki.render.RenderContext;
import com.edgenius.wiki.render.TokenVisitor;
import com.edgenius.wiki.render.handler.UserHandler;
import com.edgenius.wiki.render.object.ObjectPosition;

/**
 * Render markup @userID@ to user popup panel.
 * 
 * @author Dapeng.Ni
 */
public class UserFilter extends BasePatternTokenFilter implements ImmutableContentFilter {
    private static final String HANDLER = UserHandler.class.getName();

    public String getPatternKey() {
        return "filter.user";
    }

    //JDK1.6 @Override
    public void init() {
        regexProvider.compile(getRegex(), Pattern.MULTILINE);
    }

    //JDK1.6 @Override
    public List<Region> getRegions(CharSequence input) {
        final List<Region> list = new ArrayList<Region>();
        regexProvider.replaceByTokenVisitor(input, new TokenVisitor<Matcher>() {
            public void handleMatch(StringBuffer buffer, Matcher matcher) {
                int contentStart = matcher.start(2);
                int contentEnd = matcher.end(2);
                int start = contentStart - 1;
                int end = contentEnd + 1;
                list.add(new Region(UserFilter.this, true, start, end, contentStart, contentEnd));
            }

        });
        return list;
    }

    @Override
    public void replace(StringBuffer buffer, MatchResult result, RenderContext context) {
        if (context.getCurrentRegion() == null) {
            AuditLogger.error("Unexpected case: Immutable fitler cannot find out current region." + result.group());
        }

        String content = context.getCurrentRegion() != null ? context.getCurrentRegion().getContent()
                : result.group(2);
        String username = content;

        StringBuffer sb = new StringBuffer(result.group(1));

        if (!StringUtils.isBlank(username)) {
            HashMap<String, String> attValues = new HashMap<String, String>();
            username = username.trim();

            attValues.put(NameConstants.NAME, username);

            //this image scr will be handler after all page finish scan to HTML
            ObjectPosition userPos = new ObjectPosition(result.group(0));
            userPos.uuid = context.createUniqueKey(false);
            userPos.serverHandler = HANDLER;
            userPos.values = attValues;
            context.getObjectList().add(userPos);
            sb.append(userPos.uuid);

            buffer.append(sb);

            //append tailed text after filter
            if (result.groupCount() > 2)
                buffer.append(result.group(3));
        } else {
            //if only "@@" in page, do nothing
            buffer.append(result.group(0));
        }

    }

    @Override
    protected void replaceHTML(HTMLNode node, ListIterator<HTMLNode> nodeIter, RenderContext context) {
        if (node.getPair() == null) {
            AuditLogger.error("Unexpected case: Unable to find close </a> tag");
            return;
        }

        LinkModel link = new LinkModel();
        //we don't need view info,so just skip it
        link.fillToObject(node.getText(), null);

        //We put username into last part of anchor: /$CPAGE/up/admin
        String linkURL = link.getAnchor();
        if (StringUtils.endsWith(linkURL, "/")) {
            linkURL = StringUtils.removeEnd(linkURL, "/");
        }

        int idx = StringUtils.lastIndexOf(linkURL, "/");
        if (idx != -1) {
            String username = linkURL.substring(idx + 1);
            HTMLNode subnode = node.next();
            while (subnode != null && subnode != node.getPair()) {
                if (subnode.isTextNode())
                    subnode.reset("", true);
                subnode = subnode.next();
            }
            node.getPair().reset("", true);
            String markupBorder = getSeparatorFilter(node);
            StringBuffer markup = new StringBuffer(markupBorder).append("@");
            markup.append(username);
            markup.append("@").append(markupBorder);

            node.reset(markup.toString(), true);
        }
    }

}