?? nullencoder.java
字號:
/**
*
* <p>Title: Smgp協(xié)議TLV結構解析</p>
* <p>Description: 空編碼</p>
* <p>Copyright: Copyright (c) 2007</p>
* <p>Company: 福富軟件</p>
* @author chenxin
* @version 1.0 $Date 2007-07-03
*/
package ffcs.lbp.le.message.tlv;
/**
* "No value" encoder. This encoder type was necessary as there are some
* optional parameters that have no value. Therefore, it was possible for the
* tag/value map in <code>TLVTable</code> to have <code>null</code> values
* in it. As <code>null</code> is also returned from a map when there is no
* value for a particular key, some way was needed to distinguish between a
* parameter not set and a parameter having a null value. Hence the encoder.
*
* @author Oran Kelly
* @version $Id: NullEncoder.java 244 2006-01-22 21:56:28Z orank $
*/
public class NullEncoder implements Encoder {
/**
* Create a new NullEncoder.
*/
public NullEncoder() {
}
public void writeTo(Tag tag, Object value, byte[] b, int offset) {
}
public Object readFrom(Tag tag, byte[] b, int offset, int length) {
return null;
}
public int getValueLength(Tag tag, Object value) {
return 0;
}
}
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