/*
* Copyright 2010-2011 Research In Motion Limited.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package blackberry.io.file;
import java.io.DataInputStream;
import java.util.Date;
import net.rim.device.api.io.MIMETypeAssociations;
import net.rim.device.api.io.file.ExtendedFileConnection;
import blackberry.core.FunctionSignature;
import blackberry.core.ScriptableFunctionBase;
import blackberry.io.FileConnectionWrapper;
import blackberry.io.file.FileProperties.FilePropertiesObject;
/**
* JavaScript function class - retrieves the blackberry.io.file.FileProperties object given a specified path
*/
public final class GetFilePropertiesFunction extends ScriptableFunctionBase {
public static final String NAME = "getFileProperties";
/**
* Return the FileProperties object of a given file
*
* @param args
* args[0] : complete URL path of the file.
*
* IOException will be thrown if src file does not yet exist, or the src path is a directory
*/
public Object execute( Object thiz, Object[] args ) throws Exception {
FileConnectionWrapper fConnWrap = null;
FilePropertiesObject fileProObj = null;
try {
fConnWrap = new FileConnectionWrapper( args[ 0 ].toString() );
ExtendedFileConnection fConn = (ExtendedFileConnection) fConnWrap.getFileConnection();
Boolean isReadonly = new Boolean( !fConn.canWrite() );
Boolean isHidden = new Boolean( fConn.isHidden() );
Double size = new Double( fConn.fileSize() );
Date dateModified = new Date( fConn.lastModified() );
int dotIndex = ( args[ 0 ].toString() ).lastIndexOf( (int) '.' );
String fileExtension = "";
if( dotIndex >= 0 ) {
fileExtension = ( args[ 0 ].toString() ).substring( dotIndex );
}
String directory = "file://" + fConn.getPath();
String mimeType = MIMETypeAssociations.getMIMEType( fConn.getName() );
if( mimeType == null ) {
mimeType = "";
}
// get the character encoding by scanning the first 2-4 bytes
byte[] data = null;
if( size.intValue() >= 2 ) {
data = new byte[ 4 ];
DataInputStream dis = fConnWrap.openDataInputStream();
dis.read( data, 0, 4 ); // IOException may be thrown
}
String encoding = getEncoding( data );
fileProObj = new FilePropertiesObject( isReadonly, isHidden, size, null, dateModified, fileExtension, directory,
mimeType, encoding );
} finally {
if( fConnWrap != null ) {
fConnWrap.close();
}
}
return fileProObj;
}
private String getEncoding( byte[] data ) {
if( data == null || data.length < 2 ) {
return "";
}
switch( data[ 0 ] & 0xFF ) {
case 0x00:
if( data.length >= 4 && data[ 1 ] == (byte) 0x00 && data[ 2 ] == (byte) 0xFE && data[ 3 ] == (byte) 0xFF ) {
return "utf-32be";
}
break;
case 0xFE:
if( data[ 1 ] == (byte) 0xFF ) {
return "utf-16be";
}
break;
case 0xFF:
if( data[ 1 ] == (byte) 0xFE ) {
if( data.length >= 4 && data[ 2 ] == (byte) 0x00 && data[ 3 ] == (byte) 0x00 ) {
return "utf-32le";
} else {
return "utf-16le";
}
}
break;
case 0xEF:
if( data.length >= 3 && data[ 1 ] == (byte) 0xBB && data[ 2 ] == (byte) 0xBF ) {
return "utf-8";
}
break;
}
return "";
}
/**
* @see blackberry.core.ScriptableFunctionBase#getFunctionSignatures
*/
protected FunctionSignature[] getFunctionSignatures() {
FunctionSignature fs = new FunctionSignature( 1 );
fs.addParam( String.class, true );
return new FunctionSignature[] { fs };
}
}