public String createTempFileName(Exchange exchange, String fileName) {
String answer = fileName;
String tempName;
if (exchange.getIn().getHeader(Exchange.FILE_NAME) == null) {
// its a generated filename then add it to header so we can evaluate the expression
exchange.getIn().setHeader(Exchange.FILE_NAME, FileUtil.stripPath(fileName));
tempName = endpoint.getTempFileName().evaluate(exchange, String.class);
// and remove it again after evaluation
exchange.getIn().removeHeader(Exchange.FILE_NAME);
} else {
tempName = endpoint.getTempFileName().evaluate(exchange, String.class);
}
// check for both windows and unix separators
int pos = Math.max(answer.lastIndexOf("/"), answer.lastIndexOf("\\"));
if (pos == -1) {
// no path so use temp name as calculated
answer = tempName;
} else {
// path should be prefixed before the temp name
StringBuilder sb = new StringBuilder(answer.substring(0, pos + 1));
sb.append(tempName);
answer = sb.toString();
}
if (endpoint.getConfiguration().needToNormalize()) {
// must normalize path to cater for Windows and other OS
answer = normalizePath(answer);
}
return answer;
}
public void writeFile(Exchange exchange, String fileName)
throws GenericFileOperationFailedException {
// build directory if auto create is enabled
if (endpoint.isAutoCreate()) {
// we must normalize it (to avoid having both \ and / in the name which confuses java.io.File)
String name = FileUtil.normalizePath(fileName);
// use java.io.File to compute the file path
File file = new File(name);
String directory = file.getParent();
boolean absolute = FileUtil.isAbsolute(file);
if (directory != null) {
if (!operations.buildDirectory(directory, absolute)) {
log.debug(
"Cannot build directory [{}] (could be because of denied permissions)", directory);
}
}
}
// upload
if (log.isTraceEnabled()) {
log.trace(
"About to write [{}] to [{}] from exchange [{}]",
new Object[] {fileName, getEndpoint(), exchange});
}
boolean success = operations.storeFile(fileName, exchange);
if (!success) {
throw new GenericFileOperationFailedException("Error writing file [" + fileName + "]");
}
log.debug("Wrote [{}] to [{}]", fileName, getEndpoint());
}
public String createFileName(Exchange exchange) {
String answer;
// overrule takes precedence
Object value;
Object overrule = exchange.getIn().getHeader(Exchange.OVERRULE_FILE_NAME);
if (overrule != null) {
if (overrule instanceof Expression) {
value = overrule;
} else {
value =
exchange.getContext().getTypeConverter().convertTo(String.class, exchange, overrule);
}
} else {
value = exchange.getIn().getHeader(Exchange.FILE_NAME);
}
// if we have an overrule then override the existing header to use the overrule computed name
// from this point forward
if (overrule != null) {
exchange.getIn().setHeader(Exchange.FILE_NAME, value);
}
if (value != null
&& value instanceof String
&& StringHelper.hasStartToken((String) value, "simple")) {
log.warn(
"Simple expression: {} detected in header: {} of type String. This feature has been removed (see CAMEL-6748).",
value,
Exchange.FILE_NAME);
}
// expression support
Expression expression = endpoint.getFileName();
if (value != null && value instanceof Expression) {
expression = (Expression) value;
}
// evaluate the name as a String from the value
String name;
if (expression != null) {
log.trace("Filename evaluated as expression: {}", expression);
name = expression.evaluate(exchange, String.class);
} else {
name = exchange.getContext().getTypeConverter().convertTo(String.class, exchange, value);
}
// flatten name
if (name != null && endpoint.isFlatten()) {
// check for both windows and unix separators
int pos = Math.max(name.lastIndexOf("/"), name.lastIndexOf("\\"));
if (pos != -1) {
name = name.substring(pos + 1);
}
}
// compute path by adding endpoint starting directory
String endpointPath = endpoint.getConfiguration().getDirectory();
String baseDir = "";
if (endpointPath.length() > 0) {
// Its a directory so we should use it as a base path for the filename
// If the path isn't empty, we need to add a trailing / if it isn't already there
baseDir = endpointPath;
boolean trailingSlash = endpointPath.endsWith("/") || endpointPath.endsWith("\\");
if (!trailingSlash) {
baseDir += getFileSeparator();
}
}
if (name != null) {
answer = baseDir + name;
} else {
// use a generated filename if no name provided
answer = baseDir + endpoint.getGeneratedFileName(exchange.getIn());
}
if (endpoint.getConfiguration().needToNormalize()) {
// must normalize path to cater for Windows and other OS
answer = normalizePath(answer);
}
return answer;
}
/**
* Perform the work to process the fileExchange
*
* @param exchange fileExchange
* @param target the target filename
* @throws Exception is thrown if some error
*/
protected void processExchange(Exchange exchange, String target) throws Exception {
log.trace("Processing file: {} for exchange: {}", target, exchange);
try {
preWriteCheck();
// should we write to a temporary name and then afterwards rename to real target
boolean writeAsTempAndRename = ObjectHelper.isNotEmpty(endpoint.getTempFileName());
String tempTarget = null;
// remember if target exists to avoid checking twice
Boolean targetExists = null;
if (writeAsTempAndRename) {
// compute temporary name with the temp prefix
tempTarget = createTempFileName(exchange, target);
log.trace("Writing using tempNameFile: {}", tempTarget);
// if we should eager delete target file before deploying temporary file
if (endpoint.getFileExist() != GenericFileExist.TryRename
&& endpoint.isEagerDeleteTargetFile()) {
// cater for file exists option on the real target as
// the file operations code will work on the temp file
// if an existing file already exists what should we do?
targetExists = operations.existsFile(target);
if (targetExists) {
log.trace("EagerDeleteTargetFile, target exists");
if (endpoint.getFileExist() == GenericFileExist.Ignore) {
// ignore but indicate that the file was written
log.trace(
"An existing file already exists: {}. Ignore and do not override it.", target);
return;
} else if (endpoint.getFileExist() == GenericFileExist.Fail) {
throw new GenericFileOperationFailedException(
"File already exist: " + target + ". Cannot write new file.");
} else if (endpoint.isEagerDeleteTargetFile()
&& endpoint.getFileExist() == GenericFileExist.Override) {
// we override the target so we do this by deleting it so the temp file can be renamed
// later
// with success as the existing target file have been deleted
log.trace("Eagerly deleting existing file: {}", target);
if (!operations.deleteFile(target)) {
throw new GenericFileOperationFailedException("Cannot delete file: " + target);
}
}
}
}
// delete any pre existing temp file
if (operations.existsFile(tempTarget)) {
log.trace("Deleting existing temp file: {}", tempTarget);
if (!operations.deleteFile(tempTarget)) {
throw new GenericFileOperationFailedException("Cannot delete file: " + tempTarget);
}
}
}
// write/upload the file
writeFile(exchange, tempTarget != null ? tempTarget : target);
// if we did write to a temporary name then rename it to the real
// name after we have written the file
if (tempTarget != null) {
// if we did not eager delete the target file
if (endpoint.getFileExist() != GenericFileExist.TryRename
&& !endpoint.isEagerDeleteTargetFile()) {
// if an existing file already exists what should we do?
targetExists = operations.existsFile(target);
if (targetExists) {
log.trace("Not using EagerDeleteTargetFile, target exists");
if (endpoint.getFileExist() == GenericFileExist.Ignore) {
// ignore but indicate that the file was written
log.trace(
"An existing file already exists: {}. Ignore and do not override it.", target);
return;
} else if (endpoint.getFileExist() == GenericFileExist.Fail) {
throw new GenericFileOperationFailedException(
"File already exist: " + target + ". Cannot write new file.");
} else if (endpoint.getFileExist() == GenericFileExist.Override) {
// we override the target so we do this by deleting it so the temp file can be renamed
// later
// with success as the existing target file have been deleted
log.trace("Deleting existing file: {}", target);
if (!operations.deleteFile(target)) {
throw new GenericFileOperationFailedException("Cannot delete file: " + target);
}
}
}
}
// now we are ready to rename the temp file to the target file
log.trace("Renaming file: [{}] to: [{}]", tempTarget, target);
boolean renamed = operations.renameFile(tempTarget, target);
if (!renamed) {
throw new GenericFileOperationFailedException(
"Cannot rename file from: " + tempTarget + " to: " + target);
}
}
// any done file to write?
if (endpoint.getDoneFileName() != null) {
String doneFileName = endpoint.createDoneFileName(target);
ObjectHelper.notEmpty(doneFileName, "doneFileName", endpoint);
// create empty exchange with empty body to write as the done file
Exchange empty = new DefaultExchange(exchange);
empty.getIn().setBody("");
log.trace("Writing done file: [{}]", doneFileName);
// delete any existing done file
if (operations.existsFile(doneFileName)) {
if (!operations.deleteFile(doneFileName)) {
throw new GenericFileOperationFailedException(
"Cannot delete existing done file: " + doneFileName);
}
}
writeFile(empty, doneFileName);
}
// let's store the name we really used in the header, so end-users
// can retrieve it
exchange.getIn().setHeader(Exchange.FILE_NAME_PRODUCED, target);
} catch (Exception e) {
handleFailedWrite(exchange, e);
}
postWriteCheck();
}
