briar/briar-api/src/org/briarproject/api/sync/Message.java

package org.briarproject.api.sync;

import static org.briarproject.api.sync.SyncConstants.MAX_MESSAGE_LENGTH;
import static org.briarproject.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;

public class Message {

	private final MessageId id;
	private final GroupId groupId;
	private final long timestamp;
	private final byte[] raw;

	public Message(MessageId id, GroupId groupId, long timestamp, byte[] raw) {
		if (raw.length <= MESSAGE_HEADER_LENGTH)
			throw new IllegalArgumentException();
		if (raw.length > MAX_MESSAGE_LENGTH)
			throw new IllegalArgumentException();
		this.id = id;
		this.groupId = groupId;
		this.timestamp = timestamp;
		this.raw = raw;
	}

	/** Returns the message's unique identifier. */
	public MessageId getId() {
		return id;
	}

	/** Returns the ID of the {@link Group} to which the message belongs. */
	public GroupId getGroupId() {
		return groupId;
	}

	/** Returns the message's timestamp in milliseconds since the Unix epoch. */
	public long getTimestamp() {
		return timestamp;
	}

	/** Returns the length of the raw message in bytes. */
	public int getLength() {
		return raw.length;
	}

	/** Returns the raw message. */
	public byte[] getRaw() {
		return raw;
	}

	@Override
	public int hashCode() {
		return id.hashCode();
	}

	@Override
	public boolean equals(Object o) {
		return o instanceof Message && id.equals(((Message) o).getId());
	}
}