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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal;
import java.io.Serializable;
import com.vaadin.Application;
import com.vaadin.service.FileTypeResolver;
/**
* <code>ClassResource</code> is a named resource accessed with the class
* loader.
*
* This can be used to access resources such as icons, files, etc.
*
* @see java.lang.Class#getResource(java.lang.String)
*
* @author Vaadin Ltd.
* @since 3.0
*/
@SuppressWarnings("serial")
public class ClassResource implements ApplicationResource, Serializable {
/**
* Default buffer size for this stream resource.
*/
private int bufferSize = 0;
/**
* Default cache time for this stream resource.
*/
private long cacheTime = DEFAULT_CACHETIME;
/**
* Associated class used for indetifying the source of the resource.
*/
private final Class<?> associatedClass;
/**
* Name of the resource is relative to the associated class.
*/
private final String resourceName;
/**
* Application used for serving the class.
*/
private final Application application;
/**
* Creates a new application resource instance. The resource id is relative
* to the location of the application class.
*
* @param resourceName
* the Unique identifier of the resource within the application.
* @param application
* the application this resource will be added to.
*/
public ClassResource(String resourceName, Application application) {
this(application.getClass(), resourceName, application);
}
/**
* Creates a new application resource instance.
*
* @param associatedClass
* the class of the which the resource is associated.
* @param resourceName
* the Unique identifier of the resource within the application.
* @param application
* the application this resource will be added to.
*/
public ClassResource(Class<?> associatedClass, String resourceName,
Application application) {
this.associatedClass = associatedClass;
this.resourceName = resourceName;
this.application = application;
if (resourceName == null || associatedClass == null) {
throw new NullPointerException();
}
application.addResource(this);
}
/**
* Gets the MIME type of this resource.
*
* @see com.vaadin.terminal.Resource#getMIMEType()
*/
@Override
public String getMIMEType() {
return FileTypeResolver.getMIMEType(resourceName);
}
/**
* Gets the application of this resource.
*
* @see com.vaadin.terminal.ApplicationResource#getApplication()
*/
@Override
public Application getApplication() {
return application;
}
/**
* Gets the virtual filename for this resource.
*
* @return the file name associated to this resource.
* @see com.vaadin.terminal.ApplicationResource#getFilename()
*/
@Override
public String getFilename() {
int index = 0;
int next = 0;
while ((next = resourceName.indexOf('/', index)) > 0
&& next + 1 < resourceName.length()) {
index = next + 1;
}
return resourceName.substring(index);
}
/**
* Gets resource as stream.
*
* @see com.vaadin.terminal.ApplicationResource#getStream()
*/
@Override
public DownloadStream getStream() {
final DownloadStream ds = new DownloadStream(
associatedClass.getResourceAsStream(resourceName),
getMIMEType(), getFilename());
ds.setBufferSize(getBufferSize());
ds.setCacheTime(cacheTime);
return ds;
}
/* documented in superclass */
@Override
public int getBufferSize() {
return bufferSize;
}
/**
* Sets 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 */
@Override
public long getCacheTime() {
return cacheTime;
}
/**
* Sets the length of cache expiration 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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