echopointng.image.URLImageReference Maven / Gradle / Ivy
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/*
* This file is part of the Echo Point Project. This project is a collection
* of Components that have extended the Echo Web Application Framework.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
/*
* This file was made part of the EchoPoint library on the
* 12/03/2004. It is based largely on the Echo
* ResourceImageReference however it has been retrofitted
* to use java.net.URLs.
*/
package echopointng.image;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import nextapp.echo2.app.ApplicationInstance;
import nextapp.echo2.app.Extent;
import nextapp.echo2.app.StreamImageReference;
/**
* URLImageReference provides an ImageReference
* that gets its image data from an java.net.URL.
*/
public class URLImageReference extends StreamImageReference {
private static final Map extContentType = new HashMap();
static {
extContentType.put("gif", "image/gif");
extContentType.put("png", "image/png");
extContentType.put("jpeg", "image/jpeg");
extContentType.put("jpg", "image/jpg");
extContentType.put("bmp", "image/bmp");
extContentType.put("cod", "image/cis-cod");
extContentType.put("cpi", "image/cpi");
extContentType.put("fif", "image/fif");
extContentType.put("ief", "image/ief");
extContentType.put("rip", "image/rip");
extContentType.put("tif", "image/tiff");
extContentType.put("tiff", "image/tiff");
extContentType.put("svh", "image/svh");
extContentType.put("mcf", "image/vasa");
extContentType.put("svf", "image/vnd");
extContentType.put("dwg", "image/vnd");
extContentType.put("dxf", "image/vnd");
extContentType.put("wbmp", "image/vnd.wap.wbmp");
extContentType.put("xif", "image/vnd.xiff");
extContentType.put("wi", "image/wavelet");
extContentType.put("clp", "image/x-clp");
extContentType.put("ras", "image/x-cmu-raster");
extContentType.put("cmx", "image/x-cmx");
extContentType.put("emf", "image/x-emf");
extContentType.put("etf", "image/x-etf");
extContentType.put("fpx", "image/x-fpx");
extContentType.put("fh5", "image/x-freehand");
extContentType.put("fh4", "image/x-freehand");
extContentType.put("fhc", "image/x-freehand");
extContentType.put("cut", "image/x-halo-cut");
extContentType.put("jps", "image/x-jps");
extContentType.put("dsf", "image/x-mgx-dsf");
extContentType.put("pnm", "image/x-portable-anymap");
extContentType.put("pbm", "image/x-portable-bitmap");
extContentType.put("pgm", "image/x-portable-graymap");
extContentType.put("ppm", "image/x-portable-pixmap");
extContentType.put("qti", "image/x-quicktime");
extContentType.put("rgb", "image/x-rgb");
extContentType.put("wmf", "image/x-wmf");
extContentType.put("xbm", "image/x-xbitmap");
extContentType.put("xpm", "image/x-xpixmap");
extContentType.put("xwd", "image/x-xwindowdump");
}
private URL resourceURL;
private String contentType;
private Extent width;
private Extent height;
private String id = ApplicationInstance.generateSystemId();
/**
* Automatically determines the content type based on the name of a
* resource.
*/
private static String determineContentType(URL imageURL) {
String contentType;
// Determine content type.
String resourceName = imageURL.toExternalForm();
int extensionDelimiterPosition = resourceName.lastIndexOf(".");
if (extensionDelimiterPosition == -1) {
throw new IllegalArgumentException("Invalid content type (URL resource has no extension: " + resourceName + ")");
} else {
String extension = resourceName.substring(extensionDelimiterPosition + 1).toLowerCase();
contentType = (String) extContentType.get(extension);
if (contentType == null) {
throw new IllegalArgumentException("Invalid content type (no matching content type: " + resourceName + ")");
}
}
return contentType;
}
/**
* Creates an URLImageReference retrieved from the provided URL.
*
* The content type of the image will be determined based on the
* extension of the URLs external form.
*/
public URLImageReference(URL imageURL) {
this(imageURL, determineContentType(imageURL), null, null);
}
/**
* Creates an URLImageReference retrieved from the provided URL
* and the specified content type.
*/
public URLImageReference(URL imageURL, String contentType) {
this(imageURL, contentType, null, null);
}
/**
* Creates an URLImageReference retrieved from the provided URL
* with the specified width and height.
*
* The content type of the image will be determined based on the
* extension of the URLs external form.
*/
public URLImageReference(URL imageURL, Extent width, Extent height) {
this(imageURL, determineContentType(imageURL), width, height);
}
/**
* Creates an URLImageReference retrieved from the provided URL
* with the specified content type, width and height.
*/
public URLImageReference(URL imageURL, String contentType, Extent width, Extent height) {
super();
this.resourceURL = imageURL;
this.contentType = contentType;
this.width = width;
this.height = height;
}
/**
* @see nextapp.echo2.app.RenderIdSupport#getRenderId()
*/
public String getRenderId() {
return id;
}
/**
* @see nextapp.echo2.app.StreamImageReference#getContentType()
*/
public String getContentType() {
return contentType;
}
/**
* @see nextapp.echo2.app.ImageReference#getHeight()
*/
public Extent getHeight() {
return height;
}
/**
* @see nextapp.echo2.app.ImageReference#getWidth()
*/
public Extent getWidth() {
return width;
}
/**
* Not supported.
*/
public void update() { }
private static final int BUFFER_SIZE = 4096;
/**
* @see nextapp.echo2.app.StreamImageReference#render(java.io.OutputStream)
*/
public void render(OutputStream out) throws IOException {
InputStream in = null;
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = 0;
in = resourceURL.openStream();
do {
bytesRead = in.read(buffer);
if (bytesRead > 0) {
out.write(buffer, 0, bytesRead);
}
} while (bytesRead > 0);
try {
in.close();
} catch (IOException ioe) {
// do we care if we cant close it!
}
}
}