UserDefinedFileAttributeExample.java

package examples;

import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.UserDefinedFileAttributeView;
import java.util.List;

/**
 * Created by Ajay on 3/19/17.
 */
public class UserDefinedFileAttributeExample {

    public static void main(String[] args) throws IOException {
        Path path = Paths.get("temp.txt");
        nioUserDefinedFileAttributeView(path);
    }

    public static void nioUserDefinedFileAttributeView(Path path)
            throws IOException {

        if (File.separatorChar != '\\') {
            System.out.println("This is Windows specific and so exit!");
            return;
        }

        UserDefinedFileAttributeView userDefinedFAView = Files
                .getFileAttributeView(path, UserDefinedFileAttributeView.class);
        List<String> attributeList = userDefinedFAView.list();
        System.out.println("User Defined Attribute List Size Before Adding: "
                + attributeList.size());

        // set user define attribute
        String attributeName = "foo";
        String attributeValue = "bar";
        userDefinedFAView.write(attributeName,
                Charset.defaultCharset().encode(attributeValue));

        attributeList = userDefinedFAView.list();
        if (attributeList.size() > 0) {
            for (String attName : attributeList) {
                ByteBuffer attValue = ByteBuffer.allocate(userDefinedFAView
                        .size(attName));
                userDefinedFAView.read(attName, attValue);
                attValue.flip();
                System.out.println("User Defined Attribute Name: " + attName);
                System.out.println("User Defined Attribute Value: "
                        + Charset.defaultCharset().decode(attValue).toString());
            }
        } else {
            System.out
                    .println("User define attribute count should be at least 1"
                            + " as we have set an attribute just now!");
        }

        userDefinedFAView.delete(attributeName);

        // And list the attributes again to check they're back to 0
        attributeList = userDefinedFAView.list();
        System.out.println("User Defined Attribute List Size After Deleting: "
                + attributeList.size());
    }

}