org.p2pvpn.network.PeerID.java Source code

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Here is the source code for org.p2pvpn.network.PeerID.java

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/*
Copyright 2008, 2009 Wolfgang Ginolas
    
This file is part of P2PVPN.
    
P2PVPN is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
Foobar 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 Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public License
along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
*/

package org.p2pvpn.network;

import java.io.Serializable;
import java.security.MessageDigest;
import java.util.Arrays;
import org.apache.commons.codec.binary.Base64;
import org.p2pvpn.tools.CryptoUtils;

/**
 * PeerID ist an unique ID for every peer.
 * @author Wolfgang Ginolas
 */
public class PeerID implements Comparable<PeerID>, Serializable {
    private static int idLen = CryptoUtils.getMessageDigest().getDigestLength();

    private byte[] id;

    /**
     * Create a new PeerID.
     * @param b the ID
     * @param hash use the hash of b as ID?
     */
    public PeerID(byte[] b, boolean hash) {
        if (hash) {
            MessageDigest md = CryptoUtils.getMessageDigest();
            id = md.digest(b);
        } else {
            id = b;
        }
    }

    /**
     * Create a new PeerID
     * @param addrStr the ID as Base64 String.
     */
    public PeerID(String addrStr) {
        id = Base64.decodeBase64(addrStr.getBytes());
    }

    /**
     * The length of PeerIDs.
     * @return the length in bytes
     */
    public static int getIdLen() {
        return idLen;
    }

    /**
     * The ID as an byte array
     * @return the bytes
     */
    public byte[] getId() {
        return id;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final PeerID other = (PeerID) obj;
        if (this.id != other.id && (this.id == null || !Arrays.equals(id, other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(id);
    }

    public int compareTo(PeerID o) {
        int d = id.length - o.id.length;
        if (d != 0)
            return d;
        for (int i = 0; i < id.length; i++) {
            d = id[i] - o.id[i];
            if (d != 0)
                return d;
        }
        return 0;
    }

    @Override
    public String toString() {
        return new String(Base64.encodeBase64(id, false));
    }
}