You can use them as field-definitions for a datadictionary.
for example:
public enum _ENUM_FIELDS {The enum _ENUM_FIELDS has 2 field-definitions, each entry has 3 attributes.
_SITE_NR('s', "Site"), _COUNTRY('c', "Country");
public char id;
public final String text;
private _ENUM_FIELDS(char id, String text) {
this.id = id;
this.text = text;
}
@Override
public String toString() {
return getString(id, name(), text);
}
}
- char id = the key of the field. This should be unique in a file-definition.
- String text = The field description.
- String Name = is not defined, but can be obtained by calling the name() method of the enum.
By using reflection, enums can be handled in a generic way. The class MaxEnum deals with this part. The class MaxEnumSort implements sorting an enum in various ways, based on the 3 attributes for an entry.
You should override the toString() method in the enum, and call the static function getString(), which calls MaxEnumSort, which sorts the fields within a record.
- MaxEnum - handles enums in a generic way using reflection
- MaxEnumSort - Sort an enum in various ways
- GenericJavaEnumExample - small example to show the use of MaxEnum
- MaxRecorderIniDD - example which I use in the application I'm writing now
----------------------------------------------------------------
package nl.yokoz.data;
public abstract class MaxEnumSort {
public enum _SORT_ORDER {
_TEXT, _ID, _NAAM;
}
public static _SORT_ORDER sortOrder = _SORT_ORDER._NAAM;
protected static String toString(char id, String name, String text) {----------------------------------------------------------------
switch (sortOrder) {
case _ID:
return id + " " + name + " " + text;
case _NAAM:
return name + " " + id + " " + text;
case _TEXT:
return text + " " + id + " " + name;
}
return "";
}
}
package nl.yokoz.data;----------------------------------------------------------------
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.List;
import nl.yokoz.data.MaxEnumSort._SORT_ORDER;
public class MaxEnum {
private Class theEnum;
public MaxEnum(Class aClass) {
if (aClass.isEnum()) {
theEnum = aClass;
}
}
public void toSysOut() {
final String[] enumFields = getEnumFields();
if (enumFields != null) {
System.out.println(theEnum.getName());
System.out.println("Sorted on: " + MaxEnumSort.sortOrder);
for (String enumField : enumFields) {
System.out.println(enumField); // This will call toString in the
// reflected enum. The final
// text comes
// from MaxEnumSort:toString.
}
System.out.println();
}
}
public String[] getEnumFields() {
String[] enumFields = null;
if (theEnum != null) {
List enumConstants =Arrays.asList(theEnum.getEnumConstants());
enumFields = new String[enumConstants.size()];
int i = 0;
for (Object enumConstant : enumConstants) {
enumFields[i++] = enumConstant.toString();
}
Arrays.sort(enumFields);
}
return enumFields;
}
public void showFields(boolean bNoConstants) {
if (theEnum != null) {
Field[] fields = getDeclaredFields(bNoConstants);
for (Field field : fields) {
System.out.println(field.toString());
}
}
}
public Field[] getDeclaredFields(boolean bNoConstants) {
Field[] fields = theEnum.getDeclaredFields();
if (!bNoConstants) {
return fields;
}
int i = 0;
int f = 0;
int[] fieldIndexes = new int[fields.length];
for (Field field : fields) {
if (!field.isEnumConstant()) {
fieldIndexes[f++] = i;
}
i++;
}
Field[] fieldsNoConstants = new Field[f];
for (int j = 0; j < f; j++) {
fieldsNoConstants[j] = fields[fieldIndexes[j]];
}
return fieldsNoConstants;
}
public void toSysOutAll() {
for (_SORT_ORDER sortOrder : MaxEnumSort._SORT_ORDER.values()) {
MaxEnumSort.sortOrder = sortOrder;
toSysOut();
}
}
}
package nl.yokoz.maxrecorder.db.dd;
import nl.yokoz.data.MaxEnum;
import nl.yokoz.data.MaxEnumSort;
public class GenericJavaEnumExample extends MaxEnumSort {
public enum _ENUM_FIELDS {
_SITE_NR('s', "Site"), _COUNTRY('c', "Country"), _TIMEZONE('t', "TimeZone"), _LOCATION_ACTIVE('a', "Location Active");
public char id;
public final String text;
private _ENUM_FIELDS(char id, String text) {
this.id = id;
this.text = text;
}
@Override
public String toString() {
return getString(id, name(), text);
}
}
public static String getString(char id, String name, String text) {
return toString(id, name, text); // call toString in MaxEnumSort, the
// parent class.
}
public static void main(String[] args) {
final MaxEnum maxEnum = new MaxEnum(GenericJavaEnumExample._ENUM_FIELDS.class);
maxEnum.showFields(true);
maxEnum.toSysOutAll();
}
}
The output when running main() is:
public char nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS.id
public final java.lang.String nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS.text
private static final nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS[] nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS.ENUM$VALUES
nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS
Sorted on: _TEXT
Country c _COUNTRY
Location Active a _LOCATION_ACTIVE
Site s _SITE_NR
TimeZone t _TIMEZONE
nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS
Sorted on: _ID
a _LOCATION_ACTIVE Location Active
c _COUNTRY Country
s _SITE_NR Site
t _TIMEZONE TimeZone
nl.yokoz.maxrecorder.db.dd.GenericJavaEnumExample$_ENUM_FIELDS
Sorted on: _NAAM
_COUNTRY c Country
_LOCATION_ACTIVE a Location Active
_SITE_NR s Site
_TIMEZONE t TimeZone
----------------------------------------------------------------
package nl.yokoz.maxrecorder.db.dd;
import nl.yokoz.data.MaxEnum;
import nl.yokoz.data.MaxEnumSort;
public class MaxRecorderIniDD extends MaxEnumSort {
public enum _FIELDS {
_OUTPUTFILE_PREFIX('o', "OutputFilePrefix"), _SITE_NR('s', "Site"), _COUNTRY('c', "Country"), _TIMEZONE('t', "TimeZone"), _LOCATION_ACTIVE('a', "Location Active"), _AWAKE_HOUR('a', "AwakeHour"), _AWAKE_MINUTE('b', "AwakeMinuut"), _NO_SIZECHECK('c', "noSizeCheck"), _SHOW_TIMESTAMP('t', "ShowTimestamp"), _SLEEP_HOUR('h', "SleepHour"), _SLEEP_MINUTE('m', "SleepMinuut"), _EXTENTIE('e', "Extentie"), _CALC_FILENAME('q', "CalcFileName"), _IMAGE_SIZE('s', "Image size"), _LOCATIE_NR('l', "Locatie"), _CAPTURE_INTERVAL_SECONDS('i', "CaptureIntervalSeconds"), _OUTPUTFILE_POSTPREFIX('p', "OutputFilePostFix"), _LOCATION_NAME('n', "LocationName");
public char id;
public final String text;
private _FIELDS(char id, String text) {
this.id = id;
this.text = text;
}
@Override
public String toString() {
return getString(id, name(), text);
}
}
public static String getString(char id, String name, String text) {
// call toString in MaxEnumSort, the parent class.
return toString(id, name, text);
}
public static void main(String[] args) {
final MaxEnum maxEnum = new MaxEnum(_FIELDS.class);
// enable the following line, when you want to change the default
// sortorder.
// MaxEnumSort.sortOrder = _SORT_ORDER._TEXT;
maxEnum.toSysOut();
maxEnum.showFields(false);
maxEnum.toSysOutAll();
}
}
The output when running main() is:
nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS
Sorted on: _NAAM
_AWAKE_HOUR a AwakeHour
_AWAKE_MINUTE b AwakeMinuut
_CALC_FILENAME q CalcFileName
_CAPTURE_INTERVAL_SECONDS i CaptureIntervalSeconds
_COUNTRY c Country
_EXTENTIE e Extentie
_IMAGE_SIZE s Image size
_LOCATIE_NR l Locatie
_LOCATION_ACTIVE a Location Active
_LOCATION_NAME n LocationName
_NO_SIZECHECK c noSizeCheck
_OUTPUTFILE_POSTPREFIX p OutputFilePostFix
_OUTPUTFILE_PREFIX o OutputFilePrefix
_SHOW_TIMESTAMP t ShowTimestamp
_SITE_NR s Site
_SLEEP_HOUR h SleepHour
_SLEEP_MINUTE m SleepMinuut
_TIMEZONE t TimeZone
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._OUTPUTFILE_PREFIX
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._SITE_NR
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._COUNTRY
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._TIMEZONE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._LOCATION_ACTIVE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._AWAKE_HOUR
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._AWAKE_MINUTE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._NO_SIZECHECK
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._SHOW_TIMESTAMP
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._SLEEP_HOUR
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._SLEEP_MINUTE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._EXTENTIE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._CALC_FILENAME
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._IMAGE_SIZE
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._LOCATIE_NR
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._CAPTURE_INTERVAL_SECONDS
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._OUTPUTFILE_POSTPREFIX
public static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS._LOCATION_NAME
public char nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS.id
public final java.lang.String nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS.text
private static final nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS[] nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS.ENUM$VALUES
nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS
Sorted on: _TEXT
AwakeHour a _AWAKE_HOUR
AwakeMinuut b _AWAKE_MINUTE
CalcFileName q _CALC_FILENAME
CaptureIntervalSeconds i _CAPTURE_INTERVAL_SECONDS
Country c _COUNTRY
Extentie e _EXTENTIE
Image size s _IMAGE_SIZE
Locatie l _LOCATIE_NR
Location Active a _LOCATION_ACTIVE
LocationName n _LOCATION_NAME
OutputFilePostFix p _OUTPUTFILE_POSTPREFIX
OutputFilePrefix o _OUTPUTFILE_PREFIX
ShowTimestamp t _SHOW_TIMESTAMP
Site s _SITE_NR
SleepHour h _SLEEP_HOUR
SleepMinuut m _SLEEP_MINUTE
TimeZone t _TIMEZONE
noSizeCheck c _NO_SIZECHECK
nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS
Sorted on: _ID
a _AWAKE_HOUR AwakeHour
a _LOCATION_ACTIVE Location Active
b _AWAKE_MINUTE AwakeMinuut
c _COUNTRY Country
c _NO_SIZECHECK noSizeCheck
e _EXTENTIE Extentie
h _SLEEP_HOUR SleepHour
i _CAPTURE_INTERVAL_SECONDS CaptureIntervalSeconds
l _LOCATIE_NR Locatie
m _SLEEP_MINUTE SleepMinuut
n _LOCATION_NAME LocationName
o _OUTPUTFILE_PREFIX OutputFilePrefix
p _OUTPUTFILE_POSTPREFIX OutputFilePostFix
q _CALC_FILENAME CalcFileName
s _IMAGE_SIZE Image size
s _SITE_NR Site
t _SHOW_TIMESTAMP ShowTimestamp
t _TIMEZONE TimeZone
nl.yokoz.maxrecorder.db.dd.MaxRecorderIniDD$_FIELDS
Sorted on: _NAAM
_AWAKE_HOUR a AwakeHour
_AWAKE_MINUTE b AwakeMinuut
_CALC_FILENAME q CalcFileName
_CAPTURE_INTERVAL_SECONDS i CaptureIntervalSeconds
_COUNTRY c Country
_EXTENTIE e Extentie
_IMAGE_SIZE s Image size
_LOCATIE_NR l Locatie
_LOCATION_ACTIVE a Location Active
_LOCATION_NAME n LocationName
_NO_SIZECHECK c noSizeCheck
_OUTPUTFILE_POSTPREFIX p OutputFilePostFix
_OUTPUTFILE_PREFIX o OutputFilePrefix
_SHOW_TIMESTAMP t ShowTimestamp
_SITE_NR s Site
_SLEEP_HOUR h SleepHour
_SLEEP_MINUTE m SleepMinuut
_TIMEZONE t TimeZone
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