org.jscsi.target.scsi.lun.AddressMethod Maven / Gradle / Ivy
package org.jscsi.target.scsi.lun;
/**
* The ADDRESS METHOD field of a LOGICAL UNIT NUMBER's ADDRESSING field (from FIRST LEVEL ADDRESSING to FOURTH LEVEL
* ADDRESSING) defines the contents of the ADDRESS METHOD SPECIFIC field.
*
* This field is two bits long.
*
* @author Andreas Ergenzinger
*/
public enum AddressMethod {
/**
* The SCSI target device should relay the received command or task management function to the addressed dependent
* logical unit.
*/
PERIPHERAL_DEVICE_ADDRESSING_METHOD((byte) 0),
/**
* The flat space addressing method specifies a logical unit at the current level. The contents of all hierarchical
* structure addressing fields following a flat space addressing method addressing field shall be ignored.
*/
FLAT_SPACE_ADDRESSING_METHOD((byte) 1),
/**
* The SCSI device should relay the received command or task management function to the addressed dependent logical
* unit.
*/
LOGICAL_UNIT_ADDRESSING_METHOD((byte) 2),
/**
* Extended logical unit addressing specifies a logical unit at the current level.
*
* Extended logical unit addressing builds on the formats defined for dependent logical units (see 4.6.19.4) but may
* be used by SCSI devices having single level logical unit structure. In dependent logical unit addressing, the
* logical unit information at each level fits in exactly two bytes. Extended logical unit addresses have sizes of
* two bytes, four bytes, six bytes, or eight bytes.
*/
EXTENDED_LOGICAL_UNIT__ADDRESSING_METHOD((byte) 3);
/**
* The serialized value of the object.
*/
private final byte value;
private AddressMethod (final byte value) {
this.value = value;
}
/**
* Returns the serialized value of the object.
*
* @return the serialized value of the object
*/
public byte getValue () {
return value;
}
/**
* Returns the {@link AddressMethod} with a matching {@link #value} or null if no such
* {@link AddressMethod} exists.
*
* @param value the value from a serialized ADDRESS METHOD field
* @return the {@link AddressMethod} with a matching {@link #value} or or null
*/
public static AddressMethod getValue (int value) {
if (0 <= value && value <= 3) return values()[value];
return null;
}
}