net.hillsdon.reviki.wiki.renderer.creole.CreoleLinkContentsSplitter.java Source code

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Here is the source code for net.hillsdon.reviki.wiki.renderer.creole.CreoleLinkContentsSplitter.java

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/**
 * Copyright 2008 Matthew Hillsdon
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.hillsdon.reviki.wiki.renderer.creole;

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.regex.MatchResult;

import org.apache.commons.lang.StringUtils;

public class CreoleLinkContentsSplitter implements LinkContentSplitter {

    public LinkParts split(final MatchResult match) {
        String in = match.group(1);
        return split(in);
    }

    /**
     * Splits links of the form target or text|target where target is
     * 
     * PageName wiki:PageName PageName#fragment wiki:PageName#fragment
     * A String representing an absolute URI scheme://valid/absolute/uri
     * Any character not in the `unreserved`, `punct`, `escaped`, or `other` categories (RFC 2396),
     * and not equal '/' or '@', is %-encoded. 
     * 
     * @param in The String to split
     * @return The split LinkParts
     */
    LinkParts split(final String in) {
        String target = StringUtils.trimToEmpty(StringUtils.substringBefore(in, "|"));
        String text = StringUtils.trimToNull(StringUtils.substringAfter(in, "|"));
        if (target == null) {
            target = "";
        }
        if (text == null) {
            text = target;
        }
        // Link target can be PageName, wiki:PageName or a URL.
        URI uri = null;
        try {
            URL url = new URL(target);

            uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(), url.getPort(), url.getPath(),
                    url.getQuery(), url.getRef());
            if (uri.getPath() == null || !uri.isAbsolute()) {
                uri = null;
            }
        } catch (URISyntaxException e) {
            // uri remains null
        } catch (MalformedURLException e) {
            // uri remains null
        }

        if (uri != null) {
            return new LinkParts(text, uri);
        } else {
            // Split into wiki:pageName
            String[] parts = target.split(":", 2);
            String wiki = null;
            String pageName = target;
            if (parts.length == 2) {
                wiki = parts[0];
                pageName = parts[1];
            }

            // Split into pageName#fragment
            parts = pageName.split("#", 2);
            String fragment = null;
            if (parts.length == 2) {
                pageName = parts[0];
                fragment = parts[1];
            }

            // Split into pageName/attachment
            parts = pageName.split("/", 2);
            String attachment = null;
            if (parts.length == 2) {
                pageName = parts[0];
                attachment = parts[1];
            }

            return new LinkParts(text, wiki, pageName, fragment, attachment);
        }
    }

}