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All Roads Lead to ROME. ROME is a set of Atom/RSS Java utilities that make it easy to work in Java with most syndication formats. Today it accepts all flavors of RSS (0.90, 0.91, 0.92, 0.93, 0.94, 1.0 and 2.0), Atom 0.3 and Atom 1.0 feeds. Rome includes a set of parsers and generators for the various flavors of feeds, as well as converters to convert from one format to another. The parsers can give you back Java objects that are either specific for the format you want to work with, or a generic normalized SyndFeed object that lets you work on with the data without bothering about the underlying format.

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/*
 * Copyright 2004 Sun Microsystems, Inc.
 *
 * 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 com.rometools.rome.io.impl;

import java.util.List;

import org.jdom2.Element;
import org.jdom2.Namespace;

import com.rometools.rome.feed.rss.Channel;
import com.rometools.rome.feed.rss.Description;
import com.rometools.rome.feed.rss.Item;
import com.rometools.rome.io.FeedException;

/**
 * Feed Generator for RSS 1.0
 * 
 */

public class RSS10Generator extends RSS090Generator {

    private static final String RSS_URI = "http://purl.org/rss/1.0/";
    private static final Namespace RSS_NS = Namespace.getNamespace(RSS_URI);

    public RSS10Generator() {
        super("rss_1.0");
    }

    protected RSS10Generator(final String feedType) {
        super(feedType);
    }

    @Override
    protected Namespace getFeedNamespace() {
        return RSS_NS;
    }

    @Override
    protected void populateChannel(final Channel channel, final Element eChannel) {

        super.populateChannel(channel, eChannel);

        final String channelUri = channel.getUri();
        if (channelUri != null) {
            eChannel.setAttribute("about", channelUri, getRDFNamespace());
        }

        final List items = channel.getItems();
        if (!items.isEmpty()) {
            final Element eItems = new Element("items", getFeedNamespace());
            final Element eSeq = new Element("Seq", getRDFNamespace());
            for (final Item item : items) {
                final Element lis = new Element("li", getRDFNamespace());
                final String uri = item.getUri();
                if (uri != null) {
                    lis.setAttribute("resource", uri, getRDFNamespace());
                }
                eSeq.addContent(lis);
            }
            eItems.addContent(eSeq);
            eChannel.addContent(eItems);
        }
    }

    @Override
    protected void populateItem(final Item item, final Element eItem, final int index) {

        super.populateItem(item, eItem, index);

        final String link = item.getLink();
        final String uri = item.getUri();
        if (uri != null) {
            eItem.setAttribute("about", uri, getRDFNamespace());
        } else if (link != null) {
            eItem.setAttribute("about", link, getRDFNamespace());
        }

        final Description description = item.getDescription();
        if (description != null) {
            eItem.addContent(generateSimpleElement("description", description.getValue()));
        }

        if (item.getModule(getContentNamespace().getURI()) == null && item.getContent() != null) {
            final Element elem = new Element("encoded", getContentNamespace());
            elem.addContent(item.getContent().getValue());
            eItem.addContent(elem);
        }

    }

    @Override
    protected void checkChannelConstraints(final Element eChannel) throws FeedException {
        checkNotNullAndLength(eChannel, "title", 0, -1);
        checkNotNullAndLength(eChannel, "description", 0, -1);
        checkNotNullAndLength(eChannel, "link", 0, -1);
    }

    @Override
    protected void checkImageConstraints(final Element eImage) throws FeedException {
        checkNotNullAndLength(eImage, "title", 0, -1);
        checkNotNullAndLength(eImage, "url", 0, -1);
        checkNotNullAndLength(eImage, "link", 0, -1);
    }

    @Override
    protected void checkTextInputConstraints(final Element eTextInput) throws FeedException {
        checkNotNullAndLength(eTextInput, "title", 0, -1);
        checkNotNullAndLength(eTextInput, "description", 0, -1);
        checkNotNullAndLength(eTextInput, "name", 0, -1);
        checkNotNullAndLength(eTextInput, "link", 0, -1);
    }

    @Override
    protected void checkItemsConstraints(final Element parent) throws FeedException {
    }

    @Override
    protected void checkItemConstraints(final Element eItem) throws FeedException {
        checkNotNullAndLength(eItem, "title", 0, -1);
        checkNotNullAndLength(eItem, "link", 0, -1);
    }

}