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package org.aksw.commons.collections;

import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;

/**
 * @author Claus Stadler
 *         
 *         Date: 8/12/11
 *         Time: 5:17 PM
 */
public class FileDescender
    implements Descender
{
    private FileFilter filter;

    public FileDescender() {
        this.filter = new FileFilter() {
            public boolean accept(File pathname) {
                return true;
            }};
    }

    public FileDescender(FileFilter filter) {
        this.filter = filter;
    }

    @SuppressWarnings("unchecked")
    public Collection getDescendCollection(File item) {
        if(item == null || !item.isDirectory()) {
            return new ArrayList();
        }

        File[] files = filter != null ? item.listFiles(filter) : item.listFiles();
        Collection tmp = files == null ? Collections.emptyList() : Arrays.asList(files);

        //System.out.println(tmp);
        return new ArrayList(tmp);
    }
}