DirectoryNode.java

/**
 *   FUSE-J: Java bindings for FUSE (Filesystem in Userspace by Miklos Szeredi (mszeredi@inf.bme.hu))
 *
 *   Copyright (C) 2003 Peter Levart (peter@select-tech.si)
 *
 *   This program can be distributed under the terms of the GNU LGPL.
 *   See the file COPYING.LIB
 */

package fuse.staticfs;

import fuse.FuseFtype;
import fuse.compat.FuseStat;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;


public class DirectoryNode extends Node {
    private final static int FILE_PERMS = 493; // 0755 in octal
    private Map<String, Node> children;

    public DirectoryNode(String name) {
        super(name);

        children = new HashMap<String, Node>();
    }

    //
    // create initial FuseStat structure (called from Node's constructor)
    protected FuseStat createStat() {
        FuseStat stat = new FuseStat();

        stat.mode = FuseFtype.TYPE_DIR | FILE_PERMS;
        stat.uid = stat.gid = 0;
        stat.ctime = stat.mtime = stat.atime = (int) (System.currentTimeMillis() / 1000L);
        stat.size = 0;
        stat.blocks = 0;

        return stat;
    }

    //
    // public API

    public synchronized Node addChild(Node node) {
        Node previousNode = children.put(node.getName(), node);
        node.setParent(this);

        FuseStat stat = (FuseStat) getStat().clone();
        stat.mtime = stat.atime = (int) (System.currentTimeMillis() / 1000L);
        setStat(stat);

        if (previousNode != null) {
            previousNode.setParent(null);
        }

        return previousNode;
    }

    public synchronized Node removeChild(String name) {
        Node removedNode = children.remove(name);

        if (removedNode != null) {
            FuseStat stat = (FuseStat) getStat().clone();
            stat.mtime = stat.atime = (int) (System.currentTimeMillis() / 1000L);
            setStat(stat);

            removedNode.setParent(null);
        }

        return removedNode;
    }

    public synchronized Node getChild(String name) {
        return children.get(name);
    }

    @SuppressWarnings("unchecked")
    public synchronized Node[] getChildren() {
        Collection childNodes = children.values();
        return (Node[]) childNodes.toArray(new Node[childNodes.size()]);
    }
}