Read files from Directory
Created: 2011-02-03 16:05:02
Last updated: 2011-02-03 16:05:52
This workflow reads files from a given directory, based on a known file extension (e.g. .txt), and then outputs the contents of each file in a single value/single list.
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Workflow Components
Authors (1)
Titles (1)
| Read files from Directory |
Descriptions (1)
| This workflow reads files from a given directory, based on a known file extension (e.g. .txt), and then outputs the contents of each file in a single value/single list. |
Dependencies (0)
Inputs (2)
| Name |
Description |
| input_directory |
|
| file_extension |
|
Processors (4)
| Name |
Type |
Description |
| Read_Text_File |
localworker |
ScriptBufferedReader getReader (String fileUrl) throws IOException {
InputStreamReader reader;
try {
reader = new FileReader(fileUrl);
}
catch (FileNotFoundException e) {
// try a real URL instead
URL url = new URL(fileUrl);
reader = new InputStreamReader (url.openStream());
}
return new BufferedReader(reader);
}
StringBuffer sb = new StringBuffer(4000);
BufferedReader in = getReader(fileurl);
String str;
String lineEnding = System.getProperty("line.separator");
while ((str = in.readLine()) != null) {
sb.append(str);
sb.append(lineEnding);
}
in.close();
filecontents = sb.toString();
|
| Flatten_List |
localworker |
Scriptflatten(inputs, outputs, depth) {
for (i = inputs.iterator(); i.hasNext();) {
element = i.next();
if (element instanceof Collection && depth > 0) {
flatten(element, outputs, depth - 1);
} else {
outputs.add(element);
}
}
}
outputlist = new ArrayList();
flatten(inputlist, outputlist, 1); |
| Merge_String_List_to_a_String |
localworker |
ScriptString seperatorString = "\n";
if (seperator != void) {
seperatorString = seperator;
}
StringBuffer sb = new StringBuffer();
for (Iterator i = stringlist.iterator(); i.hasNext();) {
String item = (String) i.next();
sb.append(item);
if (i.hasNext()) {
sb.append(seperatorString);
}
}
concatenated = sb.toString();
|
| List_Files_by_Extension |
localworker |
Scriptclass FileExtFilter implements FileFilter {
public FileExtFilter(String ext) {
this.ext = ext;
}
public boolean accept(File file) {
return file.getName().endsWith(ext);
}
String ext = null;
}
if (extension == void || extension.equals("")) {
throw new RuntimeException(
"The 'extension' parameter cannot be null. Please enter a valid file extension.");
}
if (directory == void || directory.equals("")) {
throw new RuntimeException(
"The 'directory' parameter cannot be null. Please enter a valid file directory.");
}
File dirObj = new File(directory);
if (!dirObj.exists()) {
throw new RuntimeException("The 'directory' parameter specified:" + directory
+ "does not exist. Please enter a valid file directory.");
}
File[] fileObjList = dirObj.listFiles(new FileExtFilter(extension));
List filelist = new ArrayList();
for (int i = 0; i < fileObjList.length; i++) {
filelist.add(fileObjList[i].getAbsolutePath());
}
|
Outputs (4)
| Name |
Description |
| flattened_list |
|
| merged_list |
|
| files_in_dir |
|
| file_contents |
|
Datalinks (9)
| Source |
Sink |
| List_Files_by_Extension:filelist |
Read_Text_File:fileurl |
| Read_Text_File:filecontents |
Flatten_List:inputlist |
| Read_Text_File:filecontents |
Merge_String_List_to_a_String:stringlist |
| input_directory |
List_Files_by_Extension:directory |
| file_extension |
List_Files_by_Extension:extension |
| Flatten_List:outputlist |
flattened_list |
| Merge_String_List_to_a_String:concatenated |
merged_list |
| List_Files_by_Extension:filelist |
files_in_dir |
| Read_Text_File:filecontents |
file_contents |
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licensed under:
Version 1
(of 1)
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