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Saturday, 30 June 2018

Apache Commons IO - OrFileFilter

Apache Commons IO - OrFileFilter


Provides conditional OR logic across a list of file filters. Returns true if any filters in the list return true. Otherwise, it returns false.

Class Declaration

Following is the declaration for org.apache.commons.io.filefilter.OrFileFilter Class −
public class OrFileFilter
   extends AbstractFileFilter implements ConditionalFileFilter, Serializable

Example of OrFileFilter Class

Here is the input file we need to parse −
Welcome to TutorialsPoint. Simply Easy Learning.
Let's print all files and directories in the current directory and then filter a file with name starting with . or ends with t.
IOTester.java
import java.io.File;
import java.io.IOException;

import org.apache.commons.io.filefilter.OrFileFilter;
import org.apache.commons.io.filefilter.PrefixFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;

public class IOTester {
   public static void main(String[] args) {
      try {
         usingOrFileFilter();
      } catch(IOException e) {
         System.out.println(e.getMessage());
      }
   }

   public static void usingOrFileFilter() throws IOException {
      //get the current directory
      File currentDirectory = new File(".");
      
      //get names of all files and directory in current directory
      String[] files = currentDirectory.list();
      System.out.println("All files and Folders.\n");
      for( int i = 0; i < files.length; i++ ) {
         System.out.println(files[i]);
      }
      
      System.out.println("\nFile starting with . or ends with t\n");
      String[] filesNames = currentDirectory.list(
         new OrFileFilter(new PrefixFileFilter("."), new WildcardFileFilter("*t")));
      for( int i = 0; i < filesNames.length; i++ ) {
         System.out.println(filesNames[i]);
      }
   }
}

Output

It will print the following result.
All files and Folders.

.classpath
.project
.settings
bin
input.txt
src

File starting with . or ends with t

.classpath
.project
.settings
input.txt

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