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256 lines
8.0 KiB
256 lines
8.0 KiB
// messageBoard.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 28.06.2004
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.data;
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import java.io.File;
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import java.io.IOException;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Locale;
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import java.util.Map;
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import java.util.TimeZone;
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import net.yacy.cora.document.UTF8;
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import net.yacy.kelondro.blob.MapHeap;
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import net.yacy.kelondro.index.RowSpaceExceededException;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.order.NaturalOrder;
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public class MessageBoard {
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private static final int categoryLength = 12;
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private static final String dateFormat = "yyyyMMddHHmmss";
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private static final SimpleDateFormat SimpleFormatter = new SimpleDateFormat(dateFormat, Locale.US);
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static {
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SimpleFormatter.setTimeZone(TimeZone.getTimeZone("GMT"));
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}
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private MapHeap database = null;
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private int sn = 0;
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public MessageBoard(final File path) throws IOException {
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new File(path.getParent()).mkdir();
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if (database == null) {
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//database = new MapView(BLOBTree.toHeap(path, true, true, categoryLength + dateFormat.length() + 2, recordSize, '_', NaturalOrder.naturalOrder, pathNew), 500, '_');
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database = new MapHeap(path, categoryLength + dateFormat.length() + 2, NaturalOrder.naturalOrder, 1024 * 64, 500, '_');
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}
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sn = 0;
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}
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public int size() {
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return database.size();
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}
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public void close() {
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database.close();
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}
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static String dateString() {
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synchronized (SimpleFormatter) {
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return SimpleFormatter.format(new Date());
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}
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}
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String snString() {
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String s = Integer.toString(sn);
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if (s.length() == 1) s = "0" + s;
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sn++;
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if (sn > 99) sn = 0;
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return s;
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}
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public entry newEntry(final String category,
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final String authorName, final String authorHash,
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final String recName, final String recHash,
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final String subject, final byte[] message) {
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return new entry(category, authorName, authorHash, recName, recHash, subject, message);
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}
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public class entry {
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String key; // composed by category and date
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Map<String, String> record; // contains author, target hash, subject and message
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public entry(final String category,
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String authorName, String authorHash,
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String recName, String recHash,
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String subject, final byte[] message) {
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record = new HashMap<String, String>();
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key = category;
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if (key.length() > categoryLength) key = key.substring(0, categoryLength);
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while (key.length() < categoryLength) key += "_";
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key += dateString() + snString();
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record.put("author", ((authorName == null) || (authorName.length() == 0)) ? authorName : "anonymous");
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record.put("recipient", ((recName == null) || (recName.length() == 0)) ? recName : "anonymous");
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record.put("ahash", (authorHash == null) ? authorHash : "");
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record.put("rhash", (recHash == null) ? recHash : "");
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record.put("subject", (subject == null) ? subject : "");
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record.put("message", (message == null) ? "" : Base64Order.enhancedCoder.encode(message));
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record.put("read", "false");
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}
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entry(final String key, final Map<String, String> record) {
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this.key = key;
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this.record = record;
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}
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public Date date() {
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try {
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String c = key.substring(categoryLength);
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c = c.substring(0, c.length() - 2);
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synchronized (SimpleFormatter) {
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return SimpleFormatter.parse(c);
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}
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} catch (final ParseException e) {
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return new Date();
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}
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}
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public String category() {
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String c = key.substring(0, categoryLength);
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while (c.endsWith("_")) c = c.substring(0, c.length() - 1);
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return c;
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}
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public String author() {
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final String a = record.get("author");
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if (a == null) return "anonymous";
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return a;
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}
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public String recipient() {
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final String a = record.get("recipient");
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if (a == null) return "anonymous";
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return a;
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}
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public String authorHash() {
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final String a = record.get("ahash");
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return a;
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}
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public String recipientHash() {
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final String a = record.get("rhash");
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return a;
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}
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public String subject() {
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final String s = record.get("subject");
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if (s == null) return "";
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return s;
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}
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public byte[] message() {
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final String m = record.get("message");
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if (m == null) return new byte[0];
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record.put("read", "true");
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return Base64Order.enhancedCoder.decode(m);
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}
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public boolean read() {
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final String r = record.get("read");
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if (r == null) return false;
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if (r.equals("false")) return false;
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return true;
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}
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}
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public String write(final entry message) {
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// writes a message and returns key
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try {
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database.insert(message.key.getBytes(), message.record);
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return message.key;
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} catch (final Exception e) {
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Log.logException(e);
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return null;
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}
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}
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public entry read(final String key) {
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Map<String, String> record;
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try {
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record = database.get(key.getBytes());
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} catch (final IOException e) {
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Log.logException(e);
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return null;
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} catch (RowSpaceExceededException e) {
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Log.logException(e);
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return null;
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}
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return new entry(key, record);
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}
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public void remove(final String key) {
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try {
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database.delete(key.getBytes());
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} catch (final IOException e) {
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}
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}
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public Iterator<String> keys(final String category, final boolean up) throws IOException {
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//return database.keys();
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return new catIter(category, up);
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}
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public class catIter implements Iterator<String> {
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private Iterator<byte[]> allIter = null;
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private String nextKey = null;
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private String category = "";
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public catIter(final String category, final boolean up) throws IOException {
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this.allIter = database.keys(up, false);
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this.category = category;
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findNext();
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}
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public void findNext() {
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while (allIter.hasNext()) {
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nextKey = UTF8.String(allIter.next());
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if (this.category == null || nextKey.startsWith(this.category)) return;
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}
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nextKey = null;
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}
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public boolean hasNext() {
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return nextKey != null;
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}
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public String next() {
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final String next = nextKey;
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findNext();
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return next;
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}
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public void remove() {
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}
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}
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}
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