net.lightbody.bmp.proxy.jetty.html.Image.java Source code

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Here is the source code for net.lightbody.bmp.proxy.jetty.html.Image.java

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// ========================================================================
// $Id: Image.java,v 1.8 2005/08/13 00:01:23 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.lightbody.bmp.proxy.jetty.html;

import net.lightbody.bmp.proxy.jetty.log.LogFactory;
import net.lightbody.bmp.proxy.jetty.util.IO;
import net.lightbody.bmp.proxy.jetty.util.LogSupport;
import org.apache.commons.logging.Log;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/* ---------------------------------------------------------------- */
/** HTML Image Tag.
 * @see net.lightbody.bmp.proxy.jetty.html.Block
 * @version $Id: Image.java,v 1.8 2005/08/13 00:01:23 gregwilkins Exp $
 * @author Greg Wilkins
*/
public class Image extends Tag {
    private static Log log = LogFactory.getLog(Image.class);

    /* ------------------------------------------------------------ */
    public Image(String src) {
        super("img");
        attribute("src", src);
    }

    /* ------------------------------------------------------------ */
    /** Construct from GIF file.
     */
    public Image(String dirname, String src) {
        super("img");
        attribute("src", src);
        setSizeFromGif(dirname, src);
    }

    /* ------------------------------------------------------------ */
    /** Construct from GIF file.
     */
    public Image(File gif) {
        super("img");
        attribute("src", gif.getName());
        setSizeFromGif(gif);
    }

    /* ------------------------------------------------------------ */
    public Image(String src, int width, int height, int border) {
        this(src);
        width(width);
        height(height);
        border(border);
    }

    /* ------------------------------------------------------------ */
    public Image border(int b) {
        attribute("border", b);
        return this;
    }

    /* ------------------------------------------------------------ */
    public Image alt(String alt) {
        attribute("alt", alt);
        return this;
    }

    /* ------------------------------------------------------------ */
    /** Set the image size from the header of a GIF file.
     * @param dirname The directory name, expected to be in OS format
     * @param pathname The image path name relative to the directory.
     *                 Expected to be in WWW format (i.e. with slashes)
     *                 and will be converted to OS format.
     */
    public Image setSizeFromGif(String dirname, String pathname) {
        String filename = dirname + pathname.replace('/', File.separatorChar);
        return setSizeFromGif(filename);
    }

    /* ------------------------------------------------------------ */
    /** Set the image size from the header of a GIF file.
     */
    public Image setSizeFromGif(String filename) {
        return setSizeFromGif(new File(filename));
    }

    /* ------------------------------------------------------------ */
    /** Set the image size from the header of a GIF file.
     */
    public Image setSizeFromGif(File gif) {
        if (gif.canRead()) {
            FileInputStream in = null;
            try {
                byte[] buf = new byte[10];
                in = new FileInputStream(gif);
                if (in.read(buf, 0, 10) == 10) {
                    if (log.isDebugEnabled())
                        log.debug("Image " + gif.getName() + " is " + ((0x00ff & buf[7]) * 256 + (0x00ff & buf[6]))
                                + " x " + (((0x00ff & buf[9]) * 256 + (0x00ff & buf[8]))));
                    width((0x00ff & buf[7]) * 256 + (0x00ff & buf[6]));
                    height(((0x00ff & buf[9]) * 256 + (0x00ff & buf[8])));
                }
            } catch (IOException e) {
                LogSupport.ignore(log, e);
            } finally {
                IO.close(in);
            }
        }

        return this;
    }

}