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/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
/*******************************************************************************
* Product of NIST/ITL Advanced Networking Technologies Division (ANTD).        *
*******************************************************************************/
package android.gov.nist.javax.sip.header;
import android.javax.sip.header.*;
import android.javax.sip.InvalidArgumentException;

/**
 * MaxForwards SIPHeader
 *
 * @version 1.2 $Revision: 1.9 $ $Date: 2010-05-06 14:07:50 $
 *
 * @author M. Ranganathan   
* @author Olivier Deruelle
* */ public class MaxForwards extends SIPHeader implements MaxForwardsHeader { /** * Comment for serialVersionUID */ private static final long serialVersionUID = -3096874323347175943L; /** maxForwards field. */ protected int maxForwards; /** Default constructor. */ public MaxForwards() { super(NAME); } public MaxForwards( int m ) throws InvalidArgumentException { super(NAME); this.setMaxForwards( m ); } /** get the MaxForwards field. * @return the maxForwards member. */ public int getMaxForwards() { return maxForwards; } /** * Set the maxForwards member * @param maxForwards maxForwards parameter to set */ public void setMaxForwards(int maxForwards) throws InvalidArgumentException { if (maxForwards < 0 || maxForwards > 255) throw new InvalidArgumentException( "bad max forwards value " + maxForwards); this.maxForwards = maxForwards; } /** * Encode into a string. * @return encoded string. * */ public String encodeBody() { return encodeBody(new StringBuilder()).toString(); } protected StringBuilder encodeBody(StringBuilder buffer) { return buffer.append(maxForwards); } /** Boolean function * @return true if MaxForwards field reached zero. */ public boolean hasReachedZero() { return maxForwards == 0; } /** decrement MaxForwards field one by one. */ public void decrementMaxForwards() throws TooManyHopsException { if (maxForwards > 0) maxForwards--; else throw new TooManyHopsException ("has already reached 0!"); } public boolean equals(Object other) { if (this==other) return true; if (other instanceof MaxForwardsHeader) { final MaxForwardsHeader o = (MaxForwardsHeader) other; return this.getMaxForwards() == o.getMaxForwards(); } return false; } }




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