123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174 |
- /*
- @VaadinApache2LicenseForJavaFiles@
- */
-
- package com.vaadin.terminal;
-
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
-
- import com.vaadin.Application;
- import com.vaadin.service.FileTypeResolver;
- import com.vaadin.terminal.Terminal.ErrorEvent;
-
- /**
- * <code>FileResources</code> are files or directories on local filesystem. The
- * files and directories are served through URI:s to the client terminal and
- * thus must be registered to an URI context before they can be used. The
- * resource is automatically registered to the application when it is created.
- *
- * @author Vaadin Ltd.
- * @version
- * @VERSION@
- * @since 3.0
- */
- @SuppressWarnings("serial")
- public class FileResource implements ApplicationResource {
-
- /**
- * Default buffer size for this stream resource.
- */
- private int bufferSize = 0;
-
- /**
- * File where the downloaded content is fetched from.
- */
- private File sourceFile;
-
- /**
- * Application.
- */
- private final Application application;
-
- /**
- * Default cache time for this stream resource.
- */
- private long cacheTime = DownloadStream.DEFAULT_CACHETIME;
-
- /**
- * Creates a new file resource for providing given file for client
- * terminals.
- */
- public FileResource(File sourceFile, Application application) {
- this.application = application;
- setSourceFile(sourceFile);
- application.addResource(this);
- }
-
- /**
- * Gets the resource as stream.
- *
- * @see com.vaadin.terminal.ApplicationResource#getStream()
- */
- @Override
- public DownloadStream getStream() {
- try {
- final DownloadStream ds = new DownloadStream(new FileInputStream(
- sourceFile), getMIMEType(), getFilename());
- ds.setParameter("Content-Length",
- String.valueOf(sourceFile.length()));
-
- ds.setCacheTime(cacheTime);
- return ds;
- } catch (final FileNotFoundException e) {
- // Log the exception using the application error handler
- getApplication().getErrorHandler().terminalError(new ErrorEvent() {
-
- @Override
- public Throwable getThrowable() {
- return e;
- }
-
- });
-
- return null;
- }
- }
-
- /**
- * Gets the source file.
- *
- * @return the source File.
- */
- public File getSourceFile() {
- return sourceFile;
- }
-
- /**
- * Sets the source file.
- *
- * @param sourceFile
- * the source file to set.
- */
- public void setSourceFile(File sourceFile) {
- this.sourceFile = sourceFile;
- }
-
- /**
- * @see com.vaadin.terminal.ApplicationResource#getApplication()
- */
- @Override
- public Application getApplication() {
- return application;
- }
-
- /**
- * @see com.vaadin.terminal.ApplicationResource#getFilename()
- */
- @Override
- public String getFilename() {
- return sourceFile.getName();
- }
-
- /**
- * @see com.vaadin.terminal.Resource#getMIMEType()
- */
- @Override
- public String getMIMEType() {
- return FileTypeResolver.getMIMEType(sourceFile);
- }
-
- /**
- * Gets the length of cache expiration time. 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. Default is
- * <code>DownloadStream.DEFAULT_CACHETIME</code>.
- *
- * @return Cache time in milliseconds.
- */
- @Override
- public long getCacheTime() {
- return cacheTime;
- }
-
- /**
- * Sets the length of cache expiration time. 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.
- *
- * @param cacheTime
- * the cache time in milliseconds.
- */
- public void setCacheTime(long cacheTime) {
- this.cacheTime = cacheTime;
- }
-
- /* 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;
- }
-
- }
|