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yacy_search_server/source/de/anomic/data/BookmarksDB.java

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//bookmarksDB.java
//-------------------------------------
//part of YACY
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//
//This file has been originally contributed by Alexander Schier
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.data;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.net.MalformedURLException;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import net.yacy.cora.document.UTF8;
import net.yacy.kelondro.blob.MapHeap;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.index.RowSpaceExceededException;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.order.NaturalOrder;
public class BookmarksDB {
// ------------------------------------
// Declaration of Class-Attributes
// ------------------------------------
//final static int SORT_ALPHA = 1;
private final static int SORT_SIZE = 2;
private final static int SHOW_ALL = -1;
// bookmarks
private MapHeap bookmarks;
// tags
private ConcurrentHashMap<String, Tag> tags;
private BookmarkDate dates;
// ------------------------------------
// bookmarksDB's class constructor
// ------------------------------------
public BookmarksDB(final File bookmarksFile, final File datesFile) throws IOException {
// bookmarks
bookmarksFile.getParentFile().mkdirs();
//this.bookmarksTable = new kelondroMap(kelondroDyn.open(bookmarksFile, bufferkb * 1024, preloadTime, 12, 256, '_', true, false));
//this.bookmarksTable = new MapView(BLOBTree.toHeap(bookmarksFile, true, true, 12, 256, '_', NaturalOrder.naturalOrder, bookmarksFileNew), 1000, '_');
this.bookmarks = new MapHeap(bookmarksFile, 12, NaturalOrder.naturalOrder, 1024 * 64, 1000, '_');
// tags
tags = new ConcurrentHashMap<String, Tag>();
Log.logInfo("BOOKMARKS", "started init of tags from bookmarks.db...");
final Iterator<Bookmark> it = new bookmarkIterator(true);
Bookmark bookmark;
Tag tag;
String[] tagArray;
while(it.hasNext()){
bookmark = it.next();
// if (bookmark == null) continue;
tagArray = BookmarkHelper.cleanTagsString(bookmark.getTagsString() + bookmark.getFoldersString()).split(",");
tag = null;
for (final String element : tagArray) {
tag = getTag(BookmarkHelper.tagHash(element));
if (tag == null) {
tag = new Tag(element);
}
tag.addUrl(bookmark.getUrlHash());
putTag(tag);
}
}
Log.logInfo("BOOKMARKS", "finished init " + this.tags.size() + " tags using your "+bookmarks.size()+" bookmarks.");
// dates
final boolean datesExisted = datesFile.exists();
//this.datesTable = new MapView(BLOBTree.toHeap(datesFile, true, true, 20, 256, '_', NaturalOrder.naturalOrder, datesFileNew), 500, '_');
this.dates = new BookmarkDate(datesFile);
if (!datesExisted) this.dates.init(new bookmarkIterator(true));
}
// -----------------------------------------------------
// bookmarksDB's functions for 'destructing' the class
// -----------------------------------------------------
public void close(){
bookmarks.close();
tags.clear();
dates.close();
}
// -----------------------------------------------------------
// bookmarksDB's functions for bookmarksTable / bookmarkCache
// -----------------------------------------------------------
public Bookmark createBookmark(final String url, final String user){
if (url == null || url.length() == 0) return null;
final Bookmark bk = new Bookmark(url);
bk.setOwner(user);
return (bk.getUrlHash() == null || bk.toMap() == null) ? null : bk;
}
// returning the number of bookmarks
public int bookmarksSize(){
return bookmarks.size();
}
// adding a bookmark to the bookmarksDB
public void saveBookmark(final Bookmark bookmark){
try {
bookmarks.insert(bookmark.getUrlHash().getBytes(), bookmark.entry);
} catch (final Exception e) {
Log.logException(e);
}
}
public String addBookmark(final Bookmark bookmark){
this.saveBookmark(bookmark);
return bookmark.getUrlHash();
}
public Bookmark getBookmark(final String urlHash){
try {
final Map<String, String> map = bookmarks.get(urlHash.getBytes());
return (map == null) ? null : new Bookmark(map);
} catch (final IOException e) {
Log.logException(e);
return null;
} catch (RowSpaceExceededException e) {
Log.logException(e);
return null;
}
}
public boolean removeBookmark(final String urlHash){
final Bookmark bookmark = getBookmark(urlHash);
if (bookmark == null) return false; //does not exist
final Set<String> tagSet = bookmark.getTags();
BookmarksDB.Tag tag=null;
final Iterator<String> it=tagSet.iterator();
while(it.hasNext()){
tag=getTag(BookmarkHelper.tagHash(it.next()));
if(tag!=null){
tag.delete(urlHash);
putTag(tag);
}
}
Bookmark b;
try {
b = getBookmark(urlHash);
bookmarks.delete(urlHash.getBytes());
} catch (final IOException e) {
b = null;
}
return b != null;
}
public Iterator<String> getBookmarksIterator(final boolean priv) {
final TreeSet<String> set=new TreeSet<String>(new bookmarkComparator(true));
Iterator<Bookmark> it;
try {
it = new bookmarkIterator(true);
} catch (IOException e) {
Log.logException(e);
return set.iterator();
}
Bookmark bm;
while(it.hasNext()){
bm=it.next();
// if (bm == null) continue;
if(priv || bm.getPublic()){
set.add(bm.getUrlHash());
}
}
return set.iterator();
}
public Iterator<String> getBookmarksIterator(final String tagName, final boolean priv){
final TreeSet<String> set=new TreeSet<String>(new bookmarkComparator(true));
final String tagHash=BookmarkHelper.tagHash(tagName);
final Tag tag=getTag(tagHash);
Set<String> hashes=new HashSet<String>();
if(tag != null){
hashes=getTag(tagHash).getUrlHashes();
}
if(priv){
set.addAll(hashes);
}else{
final Iterator<String> it=hashes.iterator();
Bookmark bm;
while(it.hasNext()){
bm = getBookmark(it.next());
if (bm != null && bm.getPublic()) {
set.add(bm.getUrlHash());
}
}
}
return set.iterator();
}
// -------------------------------------------------
// bookmarksDB's functions for tagsTable / tagCache
// -------------------------------------------------
// returning the number of tags
public int tagsSize(){
return this.tags.size();
}
/**
* retrieve an object of type Tag from the the tagCache, if object is not cached return loadTag(hash)
* @param hash an object of type String, containing a tagHash
*/
public Tag getTag(final String hash){
return this.tags.get(hash); //null if it does not exists
}
/**
* store a Tag in tagsTable or remove an empty tag
* @param tag an object of type Tag to be stored/removed
*/
public void putTag(final Tag tag){
if (tag == null) return;
if (tag.size() > 0) {
this.tags.put(tag.getTagHash(), tag);
} else {
this.tags.remove(tag.getTagHash());
}
}
public void removeTag(final String hash) {
tags.remove(hash);
}
public Iterator<Tag> getTagIterator(final boolean priv) {
return getTagIterator(priv, 1);
}
private Iterator<Tag> getTagIterator(final boolean priv, final int c) {
final Set<Tag> set = new TreeSet<Tag>((c == SORT_SIZE) ? tagSizeComparator : tagComparator);
final Iterator<Tag> it = this.tags.values().iterator();
Tag tag;
while (it.hasNext()) {
tag=it.next();
if (tag == null) continue;
if (priv ||tag.hasPublicItems()) {
set.add(tag);
}
}
return set.iterator();
}
public Iterator<Tag> getTagIterator(final boolean priv, final int comp, final int max){
if (max==SHOW_ALL)
return getTagIterator(priv, comp);
final Iterator<Tag> it = getTagIterator(priv, SORT_SIZE);
final TreeSet<Tag> set=new TreeSet<Tag>((comp == SORT_SIZE) ? tagSizeComparator : tagComparator);
int count = 0;
while (it.hasNext() && count<=max) {
set.add(it.next());
count++;
}
return set.iterator();
}
public Iterator<Tag> getTagIterator(final String tagName, final boolean priv, final int comp) {
final TreeSet<Tag> set=new TreeSet<Tag>((comp == SORT_SIZE) ? tagSizeComparator : tagComparator);
Iterator<String> it=null;
final Iterator<String> bit=getBookmarksIterator(tagName, priv);
Bookmark bm;
Tag tag;
Set<String> tagSet;
while(bit.hasNext()){
bm=getBookmark(bit.next());
tagSet = bm.getTags();
it = tagSet.iterator();
while (it.hasNext()) {
tag=getTag(BookmarkHelper.tagHash(it.next()) );
if((priv ||tag.hasPublicItems()) && tag != null){
set.add(tag);
}
}
}
return set.iterator();
}
public Iterator<Tag> getTagIterator(final String tagName, final boolean priv, final int comp, final int max) {
if (max==SHOW_ALL) return getTagIterator(priv, comp);
final Iterator<Tag> it = getTagIterator(tagName, priv, SORT_SIZE);
final TreeSet<Tag> set=new TreeSet<Tag>((comp == SORT_SIZE) ? tagSizeComparator : tagComparator);
int count = 0;
while (it.hasNext() && count<=max) {
set.add(it.next());
count++;
}
return set.iterator();
}
// -------------------------------------
// bookmarksDB's experimental functions
// -------------------------------------
public boolean renameTag(final String oldName, final String newName){
final Tag oldTag=getTag(BookmarkHelper.tagHash(oldName));
if (oldTag != null) {
final Set<String> urlHashes = oldTag.getUrlHashes(); // preserve urlHashes of oldTag
removeTag(BookmarkHelper.tagHash(oldName)); // remove oldHash from TagsDB
Bookmark bookmark;
Set<String> tagSet = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
for (String urlHash : urlHashes) { // looping through all bookmarks which were tagged with oldName
bookmark = getBookmark(urlHash);
tagSet = bookmark.getTags();
tagSet.remove(oldName);
bookmark.setTags(tagSet, true); // might not be needed, but doesn't hurt
if(!"".equals(newName)) bookmark.addTag(newName);
saveBookmark(bookmark);
}
return true;
}
return false;
}
public void addTag(final String selectTag, final String newTag) {
Bookmark bookmark;
for (final String urlHash : getTag(BookmarkHelper.tagHash(selectTag)).getUrlHashes()) { // looping through all bookmarks which were tagged with selectTag
bookmark = getBookmark(urlHash);
bookmark.addTag(newTag);
saveBookmark(bookmark);
}
}
// --------------------------------------
// bookmarksDB's Subclasses
// --------------------------------------
/**
* Subclass of bookmarksDB, which provides the Tag object-type
*/
public class Tag {
public static final String URL_HASHES = "urlHashes";
public static final String TAG_NAME = "tagName";
private final String tagHash;
private final Map<String, String> mem;
private Set<String> urlHashes;
public Tag(final String hash, final Map<String, String> map){
tagHash = hash;
mem = map;
if (mem.containsKey(URL_HASHES)) {
urlHashes = ListManager.string2set(mem.get(URL_HASHES));
} else {
urlHashes = new HashSet<String>();
}
}
public Tag(final String name, final HashSet<String> entries){
tagHash = BookmarkHelper.tagHash(name);
mem = new HashMap<String, String>();
//mem.put(URL_HASHES, listManager.arraylist2string(entries));
urlHashes = entries;
mem.put(TAG_NAME, name);
}
public Tag(final String name){
this(name, new HashSet<String>());
}
public Map<String, String> getMap(){
mem.put(URL_HASHES, ListManager.collection2string(this.urlHashes));
return mem;
}
/**
* get the lowercase Tagname
*/
public String getTagName(){
/*if(this.mem.containsKey(TAG_NAME)){
return (String) this.mem.get(TAG_NAME);
}
return "";*/
return getFriendlyName().toLowerCase();
}
public String getTagHash(){
return tagHash;
}
/**
* @return the tag name, with all uppercase chars
*/
public String getFriendlyName(){
/*if(this.mem.containsKey(TAG_FRIENDLY_NAME)){
return (String) this.mem.get(TAG_FRIENDLY_NAME);
}
return getTagName();*/
if(this.mem.containsKey(TAG_NAME)){
return this.mem.get(TAG_NAME);
}
return "notagname";
}
public Set<String> getUrlHashes(){
return urlHashes;
}
public boolean hasPublicItems(){
return getBookmarksIterator(this.getTagName(), false).hasNext();
}
public void addUrl(final String urlHash){
urlHashes.add(urlHash);
}
public void delete(final String urlHash){
urlHashes.remove(urlHash);
}
public int size(){
return urlHashes.size();
}
}
/**
* Subclass of bookmarksDB, which provides the Bookmark object-type
*/
public class Bookmark {
public static final String BOOKMARK_URL = "bookmarkUrl";
public static final String BOOKMARK_TITLE = "bookmarkTitle";
public static final String BOOKMARK_DESCRIPTION = "bookmarkDesc";
public static final String BOOKMARK_TAGS = "bookmarkTags";
public static final String BOOKMARK_PUBLIC = "bookmarkPublic";
public static final String BOOKMARK_TIMESTAMP = "bookmarkTimestamp";
public static final String BOOKMARK_OWNER = "bookmarkOwner";
public static final String BOOKMARK_IS_FEED = "bookmarkIsFeed";
private String urlHash;
private Set<String> tagNames;
private long timestamp;
private Map<String, String> entry;
public Bookmark(final String urlHash, final Map<String, String> map) {
entry = map;
this.urlHash = urlHash;
tagNames = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
if (map.containsKey(BOOKMARK_TAGS)) tagNames.addAll(ListManager.string2set(map.get(BOOKMARK_TAGS)));
loadTimestamp();
}
public Bookmark(final String urlHash, final String url) {
entry = new HashMap<String, String>();
this.urlHash = urlHash;
entry.put(BOOKMARK_URL, url);
tagNames = new HashSet<String>();
timestamp = System.currentTimeMillis();
}
public Bookmark(final String urlHash, final DigestURI url) {
this(urlHash, url.toNormalform(false, true));
}
public Bookmark(String url){
entry = new HashMap<String, String>();
if (!url.toLowerCase().startsWith("http://") && !url.toLowerCase().startsWith("https://")) {
url="http://"+url;
}
try {
this.urlHash = UTF8.String((new DigestURI(url)).hash());
} catch (final MalformedURLException e) {
this.urlHash = null;
}
entry.put(BOOKMARK_URL, url);
this.timestamp=System.currentTimeMillis();
tagNames=new HashSet<String>();
final Bookmark oldBm=getBookmark(this.urlHash);
if(oldBm!=null && oldBm.entry.containsKey(BOOKMARK_TIMESTAMP)){
entry.put(BOOKMARK_TIMESTAMP, oldBm.entry.get(BOOKMARK_TIMESTAMP)); //preserve timestamp on edit
}else{
entry.put(BOOKMARK_TIMESTAMP, String.valueOf(System.currentTimeMillis()));
}
final BookmarkDate.Entry bmDate=dates.getDate(entry.get(BOOKMARK_TIMESTAMP));
bmDate.add(this.urlHash);
bmDate.setDatesTable();
removeBookmark(this.urlHash); //prevent empty tags
}
public Bookmark(final Map<String, String> map) throws MalformedURLException {
this(UTF8.String((new DigestURI(map.get(BOOKMARK_URL))).hash()), map);
}
Map<String, String> toMap() {
entry.put(BOOKMARK_TAGS, ListManager.collection2string(tagNames));
entry.put(BOOKMARK_TIMESTAMP, String.valueOf(this.timestamp));
return entry;
}
private void loadTimestamp() {
if(entry.containsKey(BOOKMARK_TIMESTAMP))
this.timestamp=Long.parseLong(entry.get(BOOKMARK_TIMESTAMP));
}
public String getUrlHash() {
return urlHash;
}
public String getUrl() {
return entry.get(BOOKMARK_URL);
}
public Set<String> getTags() {
return tagNames;
}
public String getTagsString() {
final String s[] = ListManager.collection2string(getTags()).split(",");
final StringBuilder stringBuilder = new StringBuilder();
for (final String element : s){
if(!element.startsWith("/")){
stringBuilder.append(element);
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
public String getFoldersString(){
final String s[] = ListManager.collection2string(getTags()).split(",");
final StringBuilder stringBuilder = new StringBuilder();
for (final String element : s){
if(element.startsWith("/")){
stringBuilder.append(element);
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
public String getDescription(){
if(entry.containsKey(BOOKMARK_DESCRIPTION)){
return entry.get(BOOKMARK_DESCRIPTION);
}
return "";
}
public String getTitle(){
if(entry.containsKey(BOOKMARK_TITLE)){
return entry.get(BOOKMARK_TITLE);
}
return entry.get(BOOKMARK_URL);
}
public String getOwner(){
if(entry.containsKey(BOOKMARK_OWNER)){
return entry.get(BOOKMARK_OWNER);
}
return null; //null means admin
}
public void setOwner(final String owner){
entry.put(BOOKMARK_OWNER, owner);
}
public boolean getPublic(){
if(entry.containsKey(BOOKMARK_PUBLIC)){
return "public".equals(entry.get(BOOKMARK_PUBLIC));
}
return false;
}
public boolean getFeed(){
if(entry.containsKey(BOOKMARK_IS_FEED)){
return "true".equals(entry.get(BOOKMARK_IS_FEED));
}
return false;
}
public void setPublic(final boolean isPublic){
if(isPublic){
entry.put(BOOKMARK_PUBLIC, "public");
} else {
entry.put(BOOKMARK_PUBLIC, "private");
}
}
public void setFeed(final boolean isFeed){
if(isFeed){
entry.put(BOOKMARK_IS_FEED, "true");
}else{
entry.put(BOOKMARK_IS_FEED, "false");
}
}
public void setProperty(final String name, final String value){
entry.put(name, value);
//setBookmarksTable();
}
public void addTag(final String tagName){
tagNames.add(tagName);
setTags(tagNames);
saveBookmark(this);
}
/**
* set the Tags of the bookmark, and write them into the tags table.
* @param tags2 a ArrayList with the tags
*/
public void setTags(final Set<String> tags2){
setTags(tags2, true);
}
/**
* set the Tags of the bookmark
* @param tagNames ArrayList with the tagnames
* @param local sets, whether the updated tags should be stored to tagsDB
*/
public void setTags(final Set<String> tags2, final boolean local){
tagNames = tags2; // TODO: check if this is safe
// tags.addAll(tags2); // in order for renameTag() to work I had to change this form 'add' to 'set'
for (final String tagName : tagNames) {
Tag tag = getTag(BookmarkHelper.tagHash(tagName));
if (tag == null) {
tag = new Tag(tagName);
}
tag.addUrl(getUrlHash());
if (local) {
putTag(tag);
}
}
toMap();
}
public long getTimeStamp(){
return timestamp;
}
public void setTimeStamp(final long ts){
this.timestamp = ts;
}
}
/**
* Subclass of bookmarksDB, which provides the bookmarkIterator object-type
*/
public class bookmarkIterator implements Iterator<Bookmark> {
Iterator<byte[]> bookmarkIter;
public bookmarkIterator(final boolean up) throws IOException {
//flushBookmarkCache(); //XXX: this will cost performance
this.bookmarkIter = BookmarksDB.this.bookmarks.keys(up, false);
//this.nextEntry = null;
}
public boolean hasNext() {
return this.bookmarkIter.hasNext();
}
public Bookmark next() {
return getBookmark(UTF8.String(this.bookmarkIter.next()));
}
public void remove() {
throw new UnsupportedOperationException();
}
}
/**
* Comparator to sort objects of type Bookmark according to their timestamps
*/
public class bookmarkComparator implements Comparator<String> {
private final boolean newestFirst;
/**
* @param newestFirst newest first, or oldest first?
*/
public bookmarkComparator(final boolean newestFirst){
this.newestFirst = newestFirst;
}
public int compare(final String obj1, final String obj2) {
final Bookmark bm1 = getBookmark(obj1);
final Bookmark bm2 = getBookmark(obj2);
if (bm1 == null || bm2 == null) {
return 0; //XXX: i think this should not happen? maybe this needs further tracing of the bug
}
if (this.newestFirst){
if (bm2.getTimeStamp() - bm1.getTimeStamp() >0) return 1;
return -1;
}
if (bm1.getTimeStamp() - bm2.getTimeStamp() > 0) return 1;
return -1;
}
}
public static final TagComparator tagComparator = new TagComparator();
public static final TagSizeComparator tagSizeComparator = new TagSizeComparator();
/**
* Comparator to sort objects of type Tag according to their names
*/
public static class TagComparator implements Comparator<Tag>, Serializable {
/**
* generated serial
*/
private static final long serialVersionUID = 3105057490088903930L;
public int compare(final Tag obj1, final Tag obj2){
return obj1.getTagName().compareTo(obj2.getTagName());
}
}
public static class TagSizeComparator implements Comparator<Tag>, Serializable {
/**
* generated serial
*/
private static final long serialVersionUID = 4149185397646373251L;
public int compare(final Tag obj1, final Tag obj2) {
if (obj1.size() < obj2.size()) {
return 1;
} else if (obj1.getTagName().equals(obj2.getTagName())) {
return 0;
} else {
return -1;
}
}
}
public BookmarkDate.Entry getDate(final String date) {
return dates.getDate(date);
}
}
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