net.sf.jrtps.message.parameter.QosPresentation Maven / Gradle / Ivy

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package net.sf.jrtps.message.parameter;

import net.sf.jrtps.transport.RTPSByteBuffer;


public class QosPresentation extends Parameter implements PublisherPolicy, SubscriberPolicy, InlineParameter {
	public enum Kind {
		INSTANCE, TOPIC, GROUP
	};

	private int access_scope;
	private boolean coherent_access;
	private boolean ordered_access;

	QosPresentation() {
		super(ParameterEnum.PID_PRESENTATION);
	}

	QosPresentation(Kind kind, boolean coherent_access, boolean ordered_access) {
		super(ParameterEnum.PID_PRESENTATION);
		switch(kind) {
		case INSTANCE: this.access_scope = 0; break;
		case TOPIC: this.access_scope = 1; break;
		case GROUP: this.access_scope = 2; break;
		}

		this.coherent_access = coherent_access;
		this.ordered_access = ordered_access;
	}

	@Override
	public void read(RTPSByteBuffer bb, int length) {
		this.access_scope = bb.read_long();
		this.coherent_access = bb.read_boolean();
		this.ordered_access = bb.read_boolean();
	}

	@Override
	public void writeTo(RTPSByteBuffer bb) {
		bb.write_long(access_scope);
		bb.write_boolean(coherent_access);
		bb.write_boolean(ordered_access);
	}

	public Kind getKind() {
		switch (access_scope) {
		case 0: return Kind.INSTANCE; 
		case 1: return Kind.TOPIC; 
		case 2: return Kind.GROUP;
		}

		return null;
	}

	public String toString() {
		return super.toString() + "(" + getKind() + ", coherent=" + coherent_access + ", ordered=" + ordered_access + ")";
	}

	@Override
	public boolean isCompatible(QosPresentation other) {
		if (access_scope >= other.access_scope) {
			if ((other.coherent_access == false) ||
					(coherent_access == true && other.coherent_access == true)) {
				if ((other.ordered_access == false) ||
						(ordered_access == true && other.ordered_access == true)) {
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Get the default QosPresentation: INSTANCE, false, false
	 * 
	 * @return default QosPresentation
	 */
	public static QosPresentation defaultPresentation() {
		return new QosPresentation(Kind.INSTANCE, false, false);
	}
}