com.google.sites.liberation.export.HistoryExporterImpl.java Source code

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Here is the source code for com.google.sites.liberation.export.HistoryExporterImpl.java

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/*
 * Copyright (C) 2009 Google 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.google.sites.liberation.export;

import com.google.gdata.data.sites.BaseContentEntry;
import com.google.sites.liberation.util.XmlElement;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.DateTimeFormatterBuilder;

import java.io.IOException;
import java.util.List;

/**
 * Exports the history of a page as html.
 * 
 * @author bsimon@google.com (Benjamin Simon)
 */
final class HistoryExporterImpl implements HistoryExporter {

    private static final DateTimeFormatter formatter = new DateTimeFormatterBuilder().appendMonthOfYearShortText()
            .appendLiteral(' ').appendDayOfMonth(1).appendLiteral(", ").appendYear(4, 4).appendLiteral(' ')
            .appendHourOfHalfday(1).appendLiteral(':').appendMinuteOfHour(1).appendLiteral(' ')
            .appendHalfdayOfDayText().toFormatter();

    @Override
    public void exportHistory(List<BaseContentEntry<?>> revisions, Appendable out) throws IOException {
        XmlElement history = new XmlElement("table");
        history.setAttribute("width", "100%");
        XmlElement header = new XmlElement("tr");
        header.setAttribute("align", "left");
        header.addElement(new XmlElement("th").addText("Version"));
        header.addElement(new XmlElement("th").addText("Last Edited"));
        header.addElement(new XmlElement("th").addText("Edited By"));
        history.addElement(header);
        int maxRevision = getMaxRevision(revisions);
        for (BaseContentEntry<?> revision : revisions) {
            int number = revision.getRevision().getValue();
            XmlElement row = new XmlElement("tr");
            String href = (number == maxRevision) ? "index.html" : "_revisions/" + number + ".html";
            XmlElement link = new XmlElement("a").addText("Version " + number).setAttribute("href", href);
            row.addElement(new XmlElement("td").addElement(link));
            DateTime jodaTime = new DateTime(revision.getUpdated().getValue());
            XmlElement updated = new XmlElement("td").addText(jodaTime.toString(formatter));
            row.addElement(updated);
            XmlElement author = new XmlElement("a");
            String name = revision.getAuthors().get(0).getName();
            String email = revision.getAuthors().get(0).getEmail();
            row.addElement(
                    new XmlElement("td").addElement(author.addText(name).setAttribute("href", "mailto:" + email)));
            history.addElement(row);
        }
        XmlElement html = new XmlElement("html");
        XmlElement head = new XmlElement("head");
        XmlElement title = new XmlElement("title");
        title.addText("Version history for " + revisions.get(0).getTitle().getPlainText());
        html.addElement(head.addElement(title));
        html.addElement(new XmlElement("body").addElement(history));
        html.appendTo(out);
    }

    private int getMaxRevision(List<BaseContentEntry<?>> revisions) {
        int max = 0;
        for (BaseContentEntry<?> revision : revisions) {
            max = Math.max(max, revision.getRevision().getValue());
        }
        return max;
    }
}