CircuitStateIndicatorImpl.java

/**
 * Start time:17:10:53 2009-03-30<br>
 * Project: mobicents-isup-stack<br>
 * 
 * @author <a href="mailto:baranowb@gmail.com"> Bartosz Baranowski
 *         </a>
 * 
 */
package org.mobicents.ss7.isup.impl.message.parameter;

import java.io.IOException;

import org.mobicents.ss7.isup.ParameterRangeInvalidException;
import org.mobicents.ss7.isup.message.parameter.CircuitStateIndicator;

/**
 * Start time:17:10:53 2009-03-30<br>
 * Project: mobicents-isup-stack<br>
 * 
 * @author <a href="mailto:baranowb@gmail.com"> Bartosz Baranowski </a>
 */
public class CircuitStateIndicatorImpl extends AbstractParameter implements CircuitStateIndicator {

	private byte[] circuitState = null;

	public CircuitStateIndicatorImpl(byte[] circuitState) throws ParameterRangeInvalidException {
		super();
		this.decodeElement(circuitState);
	}

	public CircuitStateIndicatorImpl() {
		super();
		// TODO Auto-generated constructor stub
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.mobicents.isup.ISUPComponent#decodeElement(byte[])
	 */
	public int decodeElement(byte[] b) throws ParameterRangeInvalidException {
		try {
			setCircuitState(b);
		} catch (Exception e) {
			throw new ParameterRangeInvalidException(e);
		}
		return b.length;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.mobicents.isup.ISUPComponent#encodeElement()
	 */
	public byte[] encodeElement() throws IOException {
		return this.circuitState;
	}

	public byte[] getCircuitState() {
		return circuitState;
	}

	public void setCircuitState(byte[] circuitState) throws IllegalArgumentException {
		if (circuitState == null || circuitState.length == 0) {
			throw new IllegalArgumentException("byte[] must nto be null and length must be greater than 0");
		}
		this.circuitState = circuitState;
	}

	public byte createCircuitState(int MBS, int CPS, int HBS) {
		int v = 0;
		// FIXME: Shoudl we here enforce proper coding? according to note or
		// move it to encodeElement??
		if (HBS != _HBS_NO_BLOCKING) {
			// NOTE � If bits F E are not coded 0 0, bits D C must be coded 1 1.
			// - this means CPS == 3
			CPS = _CPS_IDLE;
		}

		v = MBS & 0x03;
		v |= (CPS & 0x03) << 2;
		v |= (HBS & 0x03) << 4;
		return (byte) v;
	}

	public int getCallProcessingState(byte b) {
		return (b >> 2) & 0x03;
	}

	public int getHardwareBlockingState(byte b) {
		return (b >> 4) & 0x03;
	}

	public int getMaintenanceBlockingState(byte b) {
		return b & 0x03;
	}

	public int getCode() {

		return _PARAMETER_CODE;
	}

}