com.exedio.cope.live.MediaServlet.java Source code

Introduction

Here is the source code for com.exedio.cope.live.MediaServlet.java

Source

/*
 * Copyright (C) 2004-2009  exedio GmbH (www.exedio.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.exedio.cope.live;

import com.exedio.cope.Item;
import com.exedio.cope.Model;
import com.exedio.cope.NoSuchIDException;
import com.exedio.cope.pattern.Media;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;

final class MediaServlet {
    private final Model model;
    private final LiveServlet servlet;

    MediaServlet(final Model model, final LiveServlet servlet) {
        this.model = model;
        this.servlet = servlet;
    }

    private void startTransaction(final String name) {
        servlet.startTransaction(name);
    }

    static final String PATH_INFO = "media";
    private static final String FEATURE = "f";
    private static final String ITEM = "i";

    static String makeURL(final Media feature, final Item item) {
        return PATH_INFO + '?' + MediaServlet.FEATURE + '=' + feature.getID() + '&' + MediaServlet.ITEM + '='
                + item.getCopeID();
    }

    void doRequest(final HttpServletRequest request, final HttpServletResponse response, final Anchor anchor) {
        final String featureID = request.getParameter(FEATURE);
        if (featureID == null)
            throw new NullPointerException();
        final Media feature = (Media) model.getFeature(featureID);
        if (feature == null)
            throw new NullPointerException(featureID);

        final String itemID = request.getParameter(ITEM);
        if (itemID == null)
            throw new NullPointerException();

        final Item item;
        try {
            startTransaction("media(" + featureID + ',' + itemID + ')');
            item = model.getItem(itemID);
            model.commit();
        } catch (final NoSuchIDException e) {
            throw new RuntimeException(e);
        } finally {
            model.rollbackIfNotCommitted();
        }

        final FileItem fi = anchor.getModification(feature, item);
        if (fi == null)
            throw new NullPointerException(featureID + '-' + itemID);
        response.setContentType(fi.getContentType());
        response.setContentLength((int) fi.getSize());

        InputStream in = null;
        ServletOutputStream out = null;
        try {
            in = fi.getInputStream();
            out = response.getOutputStream();

            final byte[] b = new byte[20 * 1024];
            for (int len = in.read(b); len >= 0; len = in.read(b))
                out.write(b, 0, len);
        } catch (final IOException e) {
            throw new RuntimeException(e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (final IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (final IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}