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/* *************************************************************************
IT Mill Toolkit
Development of Browser User Interfaces Made Easy
Copyright (C) 2000-2006 IT Mill Ltd
*************************************************************************
This product is distributed under commercial license that can be found
from the product package on license/license.txt. Use of this product might
require purchasing a commercial license from IT Mill Ltd. For guidelines
on usage, see license/licensing-guidelines.html
*************************************************************************
For more information, contact:
IT Mill Ltd phone: +358 2 4802 7180
Ruukinkatu 2-4 fax: +358 2 4802 7181
20540, Turku email: info@itmill.com
Finland company www: www.itmill.com
Primary source for information and releases: www.itmill.com
********************************************************************** */
package com.itmill.toolkit.terminal;
import java.io.InputStream;
import com.itmill.toolkit.Application;
import com.itmill.toolkit.service.FileTypeResolver;
/** Stream resource is a resource provided to the client directly
* by the application. The strean resource is fetched from URI
* that is most often in the context of the application or window.
* The resource is automatically registered to window in creation.
* @author IT Mill Ltd.
* @version @VERSION@
* @since 3.0
*/
public class StreamResource implements ApplicationResource {
/** Source streamthe downloaded content is fetched from */
private StreamSource streamSource = null;
/** Explicit mime-type */
private String MIMEType = null;
/** Filename */
private String filename;
/** Application */
private Application application;
/** Default buffer size for this stream resource */
private int bufferSize = 0;
/** Default cache time for this stream resource */
private long cacheTime = DEFAULT_CACHETIME;
/** Create new stream resource for downloading from stream. */
public StreamResource(
StreamSource streamSource,
String filename,
Application application) {
this.application = application;
setFilename(filename);
setStreamSource(streamSource);
// Register to application
application.addResource(this);
}
public String getMIMEType() {
if (MIMEType != null)
return MIMEType;
return FileTypeResolver.getMIMEType(filename);
}
/** Set the mime type of the resource */
public void setMIMEType(String MIMEType) {
this.MIMEType = MIMEType;
}
/** Returns the source for this StreamResource.
* StreamSource is queried when the resource is about to be streamed
* to the client.
* @return Source of the StreamResource.
*/
public StreamSource getStreamSource() {
return streamSource;
}
/** Sets the source for this StreamResource.
* StreamSource is queried when the resource is about to be streamed
* to the client.
* @param streamSource The source to set
*/
public void setStreamSource(StreamSource streamSource) {
this.streamSource = streamSource;
}
/** Returns the filename.
* @return String
*/
public String getFilename() {
return filename;
}
/** Sets the filename.
* @param filename The filename to set
*/
public void setFilename(String filename) {
this.filename = filename;
}
/**
* @see com.itmill.toolkit.terminal.ApplicationResource#getApplication()
*/
public Application getApplication() {
return application;
}
/**
* @see com.itmill.toolkit.terminal.ApplicationResource#getStream()
*/
public DownloadStream getStream() {
StreamSource ss = getStreamSource();
if (ss == null)
return null;
DownloadStream ds = new DownloadStream(ss.getStream(), getMIMEType(), getFilename());
ds.setBufferSize(getBufferSize());
ds.setCacheTime(cacheTime);
return ds;
}
/** Interface implemented by the source of a StreamResource.
* @author IT Mill Ltd.
* @version @VERSION@
* @since 3.0
*/
public interface StreamSource {
/** Return new input stream that is used for reading
* the resource */
public InputStream getStream();
}
/* documented in superclass */
public int getBufferSize() {
return bufferSize;
}
/** Set the size of the download buffer used for this resource.
* @param bufferSize The size of the buffer in bytes.
*/
public void setBufferSize(int bufferSize) {
this.bufferSize = bufferSize;
}
/* documented in superclass */
public long getCacheTime() {
return cacheTime;
}
/** Set lenght of cache expiracy time.
*
* <p>This gives the adapter the possibility cache streams sent to the
* client. The caching may be made in adapter or at the client if the
* client supports caching. Zero or negavive value disbales the
* caching of this stream.</p>
*
* @param cacheTime The cache time in milliseconds.
*
*/
public void setCacheTime(long cacheTime) {
this.cacheTime = cacheTime;
}
}
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