io.netlibs.bgp.protocol.BinaryNextHop.java Source code

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Here is the source code for io.netlibs.bgp.protocol.BinaryNextHop.java

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/**
 *  Copyright 2012 Rainer Bieniek (Rainer.Bieniek@web.de)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 * File: org.bgp4j.rib.BinaryNextHop.java
 */
package io.netlibs.bgp.protocol;

import java.net.InetAddress;

import org.apache.commons.lang3.builder.CompareToBuilder;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;

public class BinaryNextHop implements NextHop {

    private final byte[] address;

    public BinaryNextHop(final byte[] address) {
        this.address = address;
    }

    /**
     * @return the nextHop
     */
    public byte[] getAddress() {
        return this.address;
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        return (new HashCodeBuilder()).append(this.getAddress()).toHashCode();
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(final Object obj) {
        if (!(obj instanceof BinaryNextHop)) {
            return false;
        }

        final BinaryNextHop o = (BinaryNextHop) obj;

        return (new EqualsBuilder()).append(this.getAddress(), o.getAddress()).isEquals();
    }

    @Override
    public int compareTo(final NextHop o) {
        final CompareToBuilder builder = (new CompareToBuilder()).append(this.getType(), o.getType());

        if (o.getType() == Type.Binary) {
            builder.append(this.getAddress(), ((BinaryNextHop) o).getAddress());
        }

        return builder.toComparison();
    }

    @Override
    public Type getType() {
        return Type.Binary;
    }

    private static final char[] chars = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b',
            'c', 'd', 'e', 'f' };

    @Override
    public String toString() {
        final StringBuilder builder = new StringBuilder();
        for (final byte addres : this.address) {
            builder.append(chars[(addres / 16) & 0x0f]);
            builder.append(chars[(addres % 16) & 0x0f]);
        }
        return builder.toString();
    }

    public static BinaryNextHop fromRDandNextHop(AbstractRouteDistinguisherType nhrd, InetAddress nhaddr) {

        byte[] overallNH = new byte[8 + nhaddr.getAddress().length];

        // Copy the RD type
        System.arraycopy(nhrd.getType(), 0, overallNH, 0, 2);
        // followed by the RD
        System.arraycopy(nhrd.getBytes(), 0, overallNH, 2, 6);
        // and the RD address
        System.arraycopy(nhaddr.getAddress(), 0, overallNH, 8, nhaddr.getAddress().length);
        return new BinaryNextHop(overallNH);

    }

}