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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2016 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import org.pcap4j.packet.RadiotapPacket.RadiotapData;
import org.pcap4j.util.ByteArrays;
/**
* Radiotap Antenna noise field. RF noise power at the antenna. This field contains a single signed
* 8-bit value, which indicates the RF signal power at the antenna, in decibels difference from 1mW.
*
* @see Radiotap
* @author Kaito Yamada
* @since pcap4j 1.6.5
*/
public final class RadiotapDataAntennaNoise implements RadiotapData {
/** */
private static final long serialVersionUID = -7455538178480770078L;
private static final int LENGTH = 1;
private final byte antennaNoise;
/**
* A static factory method. This method validates the arguments by {@link
* ByteArrays#validateBounds(byte[], int, int)}, which may throw exceptions undocumented here.
*
* @param rawData rawData
* @param offset offset
* @param length length
* @return a new RadiotapAntennaNoise object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static RadiotapDataAntennaNoise newInstance(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new RadiotapDataAntennaNoise(rawData, offset, length);
}
private RadiotapDataAntennaNoise(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
if (length < LENGTH) {
StringBuilder sb = new StringBuilder(200);
sb.append("The data is too short to build a RadiotapAntennaNoise (")
.append(LENGTH)
.append(" bytes). data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.antennaNoise = ByteArrays.getByte(rawData, offset);
}
private RadiotapDataAntennaNoise(Builder builder) {
if (builder == null) {
throw new NullPointerException("builder is null.");
}
this.antennaNoise = builder.antennaNoise;
}
/** @return antennaNoise (unit: dBm) */
public byte getAntennaNoise() {
return antennaNoise;
}
/** @return antennaNoise (unit: dBm) */
public int getAntennaNoiseAsInt() {
return antennaNoise;
}
@Override
public int length() {
return LENGTH;
}
@Override
public byte[] getRawData() {
return ByteArrays.toByteArray(antennaNoise);
}
/** @return a new Builder object populated with this object's fields. */
public Builder getBuilder() {
return new Builder(this);
}
@Override
public String toString() {
return toString("");
}
@Override
public String toString(String indent) {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append(indent)
.append("Antenna noise: ")
.append(ls)
.append(indent)
.append(" Antenna noise: ")
.append(antennaNoise)
.append(" dBm")
.append(ls);
return sb.toString();
}
@Override
public int hashCode() {
return antennaNoise;
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!this.getClass().isInstance(obj)) {
return false;
}
RadiotapDataAntennaNoise other = (RadiotapDataAntennaNoise) obj;
return antennaNoise == other.antennaNoise;
}
/**
* @author Kaito Yamada
* @since pcap4j 1.6.5
*/
public static final class Builder {
private byte antennaNoise;
/** */
public Builder() {}
private Builder(RadiotapDataAntennaNoise obj) {
this.antennaNoise = obj.antennaNoise;
}
/**
* @param antennaNoise antennaNoise
* @return this Builder object for method chaining.
*/
public Builder antennaNoise(byte antennaNoise) {
this.antennaNoise = antennaNoise;
return this;
}
/** @return a new RadiotapAntennaNoise object. */
public RadiotapDataAntennaNoise build() {
return new RadiotapDataAntennaNoise(this);
}
}
}
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