Synnefo

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client.foldertree;

import com.google.gwt.http.client.Response;

import com.google.gwt.i18n.client.DateTimeFormat;

import com.google.gwt.i18n.client.DateTimeFormat.PredefinedFormat;

import com.google.gwt.json.client.JSONArray;

import com.google.gwt.json.client.JSONObject;

import com.google.gwt.json.client.JSONParser;

import com.google.gwt.json.client.JSONValue;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.Iterator;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.StringTokenizer;

public class Folder extends Resource {

    /*

     * The name of the folder. If the folder is a container this is its name. If it is a virtual folder this is the

     * last part of its path

     */

    private String name = null;

    private Date lastModified = null;

    private long bytesUsed = 0;

    private Folder parent = null;

    private Set<Folder> subfolders = new LinkedHashSet<Folder>();

    /*

     * The name of the container that this folder belongs to. If this folder is container, this field equals name

     */

    private String container = null;

    /*

     * This is the full path of the folder (prefix is a misnomer but it was named so because this is used as a prefix=

     * parameter in the request that fetches its children). If the folder is a cointainer this is empty string

     */

    private String prefix = "";

    private Set<File> files = new LinkedHashSet<File>();

    private boolean inTrash = false;

    /*

     * Flag that indicates that this folder is the Trash

     */

    private boolean trash = false;

    private Set<String> tags = new LinkedHashSet<String>();

    private String owner;

    private Map<String, Boolean[]> permissions = new HashMap<String, Boolean[]>();

    private String inheritedPermissionsFrom;

    public Folder() {};

    public Folder(String name) {

        this.name = name;

    }

    public String getName() {

        return name;

    }

    public Date getLastModified() {

        return lastModified;

    }

    public long getBytesUsed() {

        return bytesUsed;

    }

    public void setLastModified(Date lastModified) {

        this.lastModified = lastModified;

    }

    public Set<Folder> getSubfolders() {

        return subfolders;

    }

    public void setSubfolders(Set<Folder> subfolders) {

        this.subfolders = subfolders;

    }

    public String getContainer() {

        return container;

    }

    public String getPrefix() {

        return prefix;

    }

    public void setPrefix(String prefix) {

        this.prefix = prefix;

    }

    private void parsePermissions(String rawPermissions) {

        String[] readwrite = rawPermissions.split(";");

        for (String s : readwrite) {

            String[] part = s.split("=");

            String perm = part[0].trim();

            String[] users = part[1].split(",");

            for (String u : users) {

                String user = u.trim();

                Boolean[] userPerm = permissions.get(u);

                if (userPerm == null) {

                    userPerm = new Boolean[2];

                    permissions.put(user, userPerm);

                }

                if (perm.equals("read")) {

                    userPerm[0] = Boolean.TRUE;

                }

                else if (perm.equals("write")) {

                    userPerm[1] = Boolean.TRUE;

                }

            }

        }

    }

    public void populate(String owner, Response response) {

        this.owner = owner;

        String header = response.getHeader("Last-Modified");

        if (header != null)

            lastModified = DateTimeFormat.getFormat(PredefinedFormat.RFC_2822).parse(header);

        header = response.getHeader("X-Container-Bytes-Used");

        if (header != null)

            bytesUsed = Long.valueOf(header);

        header = response.getHeader("X-Object-Meta-Trash");

        if (header != null && header.equals("true"))

            inTrash = true;

        header = response.getHeader("X-Container-Object-Meta");

        if (header != null && header.length() > 0) {

            for (String t : header.split(",")) {

                tags.add(t.toLowerCase().trim());

            }

        }

        inheritedPermissionsFrom = response.getHeader("X-Object-Shared-By");

        String rawPermissions = response.getHeader("X-Object-Sharing");

        if (rawPermissions != null)

            parsePermissions(rawPermissions);

        subfolders.clear(); //This is necessary in case we update a pre-existing Folder so that stale subfolders won't show up

        files.clear();

        JSONValue json = JSONParser.parseStrict(response.getText());

        JSONArray array = json.isArray();

        if (array != null) {

            for (int i=0; i<array.size(); i++) {

                JSONObject o = array.get(i).isObject();

                if (o != null) {

                    String contentType = unmarshallString(o, "content_type");

                    if (o.containsKey("subdir") || (contentType != null && (contentType.startsWith("application/directory") || contentType.startsWith("application/folder")))) {

                        Folder f = new Folder();

                        f.populate(this, o, owner, container);

                        subfolders.add(f);

                    }

                    else if (!(o.containsKey("x_object_meta_trash") && o.get("x_object_meta_trash").isString().stringValue().equals("true"))) {

                        File file = new File();

                        file.populate(this, o, owner, container);

                        files.add(file);

                    }

                }

            }

            //This step is necessary to remove the trashed folders. Trashed folders are added initially because we need to

            //avoid having in the list the virtual folders of the form {"subdir":"folder1"} which have no indication of thrash

            Iterator<Folder> iter = subfolders.iterator();

            while (iter.hasNext()) {

                Folder f = iter.next();

                if (f.isInTrash())

                    iter.remove();

            }

        }

    }

    public void populate(Folder parent, JSONObject o, String owner, String aContainer) {

        this.parent = parent;

        String path = null;

        if (o.containsKey("subdir")) {

            path = unmarshallString(o, "subdir");

        }

        else {

            path = unmarshallString(o, "name");

            lastModified = unmarshallDate(o, "last_modified");

        }

        if (path.endsWith("/"))

            path = path.substring(0, path.length() - 1);

        if (path.contains("/"))

            name = path.substring(path.lastIndexOf("/") + 1, path.length()); //strip the prefix

        else

            name = path;

        if (aContainer != null) {

            container = aContainer;

            prefix = path;

        }

        else {

            container = name;

            prefix = "";

        }

        this.owner = owner;

        if (o.containsKey("x_object_meta_trash") && o.get("x_object_meta_trash").isString().stringValue().equals("true"))

            inTrash = true;

        inheritedPermissionsFrom = unmarshallString(o, "x_object_shared_by");

        String rawPermissions = unmarshallString(o, "x_object_sharing");

        if (rawPermissions != null)

            parsePermissions(rawPermissions);

    }

    public static Folder createFromResponse(String owner, Response response, Folder result) {

        Folder f = null;

        if (result == null)

            f = new Folder();

        else

            f = result;

        f.populate(owner, response);

        return f;

    }

    @Override

    public boolean equals(Object other) {

        if (other instanceof Folder) {

            Folder o = (Folder) other;

            return getUri().equals(o.getUri());

        }

        return false;

    }

    @Override

    public int hashCode() {

        return getUri().hashCode();

    }

    public Set<File> getFiles() {

        return files;

    }

    public Folder getParent() {

        return parent;

    }

    public String getUri() {

        return "/" + container + (prefix.length() == 0 ? "" : "/" + prefix);

    }

    public boolean isInTrash() {

        return inTrash;

    }

    public boolean isContainer() {

        return parent == null;

    }

    public boolean isTrash() {

        return trash;

    }

    public void setTrash(boolean trash) {

        this.trash = trash;

    }

    public void setContainer(String container) {

        this.container = container;

    }

    public Set<String> getTags() {

        return tags;

    }

    public String getInheritedPermissionsFrom() {

        return inheritedPermissionsFrom;

    }

    public Map<String, Boolean[]> getPermissions() {

        return permissions;

    }

    public String getOwner() {

        return owner;

    }

    public boolean existChildrenPermissions() {

        for (File f : files)

            if (!f.getPermissions().isEmpty() && f.getInheritedPermissionsFrom() == null)

                return true;

        for (Folder fo : subfolders)

            if ((!fo.getPermissions().isEmpty() && fo.getInheritedPermissionsFrom() == null) || fo.existChildrenPermissions())

                return true;

        return false;

    }

        public boolean isShared() {

                return !permissions.isEmpty();

        }

}