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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.
*/
package org.onosproject.bgpio.types;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.util.Constants;
import org.onosproject.bgpio.util.Validation;
import com.google.common.base.MoreObjects;
/**
* Provides Implementation of mandatory BGP Origin path attribute.
*/
public class Origin implements BGPValueType {
/**
* Enum to provide ORIGIN types.
*/
public enum ORIGINTYPE {
IGP(0), EGP(1), INCOMPLETE(2);
int value;
/**
* Assign val with the value as the ORIGIN type.
*
* @param val ORIGIN type
*/
ORIGINTYPE(int val) {
value = val;
}
/**
* Returns value of ORIGIN type.
*
* @return ORIGIN type
*/
public byte getType() {
return (byte) value;
}
}
public static final byte ORIGIN_TYPE = 1;
public static final byte ORIGIN_VALUE_LEN = 1;
private boolean isOrigin = false;
private byte origin;
/**
* Constructor to initialize parameters.
*
* @param origin origin value
*/
public Origin(byte origin) {
this.origin = origin;
this.isOrigin = true;
}
/**
* Returns true if origin attribute is present otherwise false.
*
* @return whether origin is present or not
*/
public boolean isOriginSet() {
return this.isOrigin;
}
/**
* Returns type of Origin in Enum values.
*
* @return type of Origin in Enum values
*/
public ORIGINTYPE origin() {
if (this.origin == 0) {
return ORIGINTYPE.IGP;
} else if (this.origin == 1) {
return ORIGINTYPE.EGP;
} else {
return ORIGINTYPE.INCOMPLETE;
}
}
/**
* Reads from ChannelBuffer and parses Origin.
*
* @param cb ChannelBuffer
* @return object of Origin
* @throws BGPParseException while parsing Origin path attribute
*/
public static Origin read(ChannelBuffer cb) throws BGPParseException {
ChannelBuffer tempCb = cb.copy();
Validation parseFlags = Validation.parseAttributeHeader(cb);
int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : parseFlags
.getLength() + Constants.TYPE_AND_LEN_AS_BYTE;
ChannelBuffer data = tempCb.readBytes(len);
if ((parseFlags.getLength() > ORIGIN_VALUE_LEN) || (cb.readableBytes() < parseFlags.getLength())) {
Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_LENGTH_ERROR,
parseFlags.getLength());
}
if (parseFlags.getFirstBit() && !parseFlags.getSecondBit() && parseFlags.getThirdBit()) {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data);
}
byte originValue;
originValue = cb.readByte();
if ((originValue != ORIGINTYPE.INCOMPLETE.value) && (originValue != ORIGINTYPE.IGP.value) &&
(originValue != ORIGINTYPE.EGP.value)) {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.INVALID_ORIGIN_ATTRIBUTE, data);
}
return new Origin(originValue);
}
@Override
public short getType() {
return ORIGIN_TYPE;
}
@Override
public int write(ChannelBuffer cb) {
//Not required to Implement as of now
return 0;
}
@Override
public int hashCode() {
return Objects.hash(origin);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof Origin) {
Origin other = (Origin) obj;
return Objects.equals(origin, other.origin);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("origin", origin)
.toString();
}
}
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