helma/helma/Image.js

/*
 * Helma License Notice
 *
 * The contents of this file are subject to the Helma License
 * Version 2.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://adele.helma.org/download/helma/license.txt
 *
 * Copyright 1998-2006 Helma Software. All Rights Reserved.
 *
 * $RCSfile: helma.Image.js,v $
 * $Author: czv $
 * $Revision: 1.6 $
 * $Date: 2006/04/18 13:06:58 $
 */


if (!global.helma) {
    global.helma = {};
}

helma.Image = function(arg) {
    // according to 
    // http://grazia.helma.org/pipermail/helma-dev/2004-June/001253.html
    var generator = Packages.helma.image.ImageGenerator.getInstance();
    return generator.createImage(arg);
}


helma.Image.toString = function() {
    return "[helma.Image]";
};


helma.Image.getInfo = function(arg) {
    if (arguments.length != 1) {
        throw new java.lang.IllegalArgumentException(
            "Image.getInfo() expects one argument"
        );
    }

    var inp, result;
    var info = new Packages.helma.image.ImageInfo();
    // FIXME: we need a byte object for comparison
    var b = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 1024);

    try {
        if (arg instanceof java.io.InputStream) {
            inp = new java.io.InputStream(arg);
        // FIXME: here comes a dirty hack to check for a byte array
        } else if (arg.getClass && arg.getClass() == b.getClass()) {
            inp = new java.io.ByteArrayInputStream(arg);
        } else if (arg instanceof java.io.File) {
            inp = new java.io.FileInputStream(arg);
        } else if (arg instanceof helma.File) {
            inp = new java.io.FileInputStream(arg.getFile());
        } else if (typeof arg == "string") {
            var str = arg;
            // try to interpret argument as URL if it contains a colon,
            // otherwise or if URL is malformed interpret as file name.
            if (str.indexOf(":") > -1) {
                try {
                    var url = new java.net.URL(str);
                    inp = url.openStream();
                } catch (mux) {
                    inp = new java.io.FileInputStream(str);
                }
            } else {
                inp = new java.io.FileInputStream(str);
            }
        }
        if (inp == null) {
            var msg = "Unrecognized argument in Image.getInfo(): ";
            msg += (arg == null ? "null" : arg.getClass().toString());
            throw new java.lang.IllegalArgumentException(msg);
        }
        info.setInput(inp);
        if (info.check()) {
            result = info;
        }
    } catch (e) {
        // do nothing, returns null later
    } finally {
        if (inp != null) {
            try {
                inp.close();
            } catch (e) {}
        }
    }

    return result;
};


helma.Image.spacer = function() {
    res.contentType = "image/gif";
    res.writeBinary([71,73,70,56,57,97,2,0,2,0,-128,-1,0,-64,-64,-64,0,0,0,33,-7,4,1,0,0,0,0,44,0,0,0,0,1,0,1,0,64,2,2,68,1,0,59]);
    return;
};


helma.lib = "Image";
helma.dontEnum(helma.lib);
for (var i in helma[helma.lib])
    helma[helma.lib].dontEnum(i);
for (var i in helma[helma.lib].prototype)
    helma[helma.lib].prototype.dontEnum(i);
delete helma.lib;