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package net.gcdc.asn1.uper;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import net.gcdc.asn1.datatypes.Asn1Default;
import net.gcdc.asn1.datatypes.IsExtension;
class EnumCoder implements Decoder, Encoder {
@Override public <T> boolean canEncode(T obj, Annotation[] extraAnnotations) {
Class<?> type = obj.getClass();
return type.isEnum();
}
@Override public <T> void encode(BitBuffer bitbuffer, T obj, Annotation[] extraAnnotations) throws Asn1EncodingException {
Class<?> type = obj.getClass();
AnnotationStore annotations = new AnnotationStore(type.getAnnotations(), extraAnnotations);
String pos = String.format("%d.%d", bitbuffer.position()/8 , bitbuffer.position() % 8);
UperEncoder.logger.debug(String.format("Position %s ENUM",pos));
try {
int position = bitbuffer.position();
List<?> values = Arrays.asList(type.getEnumConstants());
int enumIndex = values.indexOf(obj);
if (!UperEncoder.hasExtensionMarker(annotations)) {
UperEncoder.logger.debug(String.format("enum without extension: index %d value %s, encoding index...", enumIndex,obj.toString()));
UperEncoder.encodeConstrainedInt(bitbuffer, enumIndex, 0, values.size() - 1);
return;
} else {
List<Object> valuesWithinExtensionRoot = new ArrayList<>();
List<Object> valuesOutsideExtensionRoot = new ArrayList<>();
for (Object c : type.getEnumConstants()) {
String field = c.toString();
boolean isExtension = false;
try {
isExtension = type.getField(field).isAnnotationPresent(IsExtension.class);
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException("Illegal value for enum field " , e);
} catch (SecurityException e) {
throw new IllegalArgumentException("Illegal access restriction for enum field " , e);
}
if (!isExtension) {
valuesWithinExtensionRoot.add(c);
} else {
valuesOutsideExtensionRoot.add(c);
}
}
if (valuesWithinExtensionRoot.contains(obj)) {
UperEncoder.logger.debug(String.format("Extension indicator set to false"));
bitbuffer.put(false);
int index = valuesWithinExtensionRoot.indexOf(obj);
UperEncoder.encodeConstrainedInt(bitbuffer, index, 0, valuesWithinExtensionRoot.size() - 1);
UperEncoder.logger.debug(String.format("ENUM with extension: index %d value %s, encoded as root value <%s>", index, obj.toString(),
bitbuffer.toBooleanStringFromPosition(position)));
return;
} else {
//CG encode the index in the extension list as small integer
UperEncoder.logger.debug(String.format("Extension indicator set to true"));
bitbuffer.put(true);
int index = valuesOutsideExtensionRoot.indexOf(obj);
UperEncoder.encodeSmallInt(bitbuffer, index);
UperEncoder.logger.debug(String.format("ENUM with extension: index %d value %s, encoded as extension <%s>", index, obj.toString(),
bitbuffer.toBooleanStringFromPosition(position)));
}
}
} catch (Asn1EncodingException e) {
throw new Asn1EncodingException(type.getName(), e);
}
}
@Override public <T> boolean canDecode(Class<T> classOfT, Annotation[] extraAnnotations) {
return classOfT.isEnum();
}
@Override public <T> T decode(BitBuffer bitbuffer,
Class<T> classOfT, Field field,
Annotation[] extraAnnotations) {
AnnotationStore annotations = new AnnotationStore(classOfT.getAnnotations(), extraAnnotations);
UperEncoder.logger.debug("ENUM");
boolean extensionPresent = false;
if (UperEncoder.hasExtensionMarker(annotations)) {
extensionPresent = bitbuffer.get();
UperEncoder.logger.debug(String.format("with extension marker, %s" , extensionPresent ? "present" : "absent"));
}
T[] enumValues = classOfT.getEnumConstants();
int rootValues = 0;
boolean isExtension = false;
for (Object c : enumValues) {
String value = c.toString();
try {
isExtension = classOfT.getField(value).isAnnotationPresent(IsExtension.class);
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException("Illegal value for extension field " , e);
} catch (SecurityException e) {
throw new IllegalArgumentException("Illegal value for extension field " , e);
}
if (!isExtension) rootValues++;
}
//
int index = 0;
if (!extensionPresent){
//root element
index = (int) UperEncoder.decodeConstrainedInt(bitbuffer,
UperEncoder.newRange(0, rootValues - 1, false));
} else {
//extension element, decode as small int without restriction
index = (int) UperEncoder.decodeSmallInt(bitbuffer);
//the encoded index is an index within the extensions list only
index = index + rootValues;
}
if (index > enumValues.length - 1 && extensionPresent) {
//this is an unknown extension
UperEncoder.logger.debug(String.format("Enum contains unknown extendion index %d" , index));
return null;
}
if (index > enumValues.length - 1 && !extensionPresent) {
//this should not happen
throw new IllegalArgumentException(
"decoded enum index " + index + " is larger then number of elements (0.."
+ enumValues.length + ") in " + classOfT.getName());
}
T value = enumValues[index];
UperEncoder.logger.debug(String.format("Enum decoded as %s" , value.toString()));
return value;
}
@SuppressWarnings("unchecked")
@Override
public <T> T getDefault(Class<T> classOfT, Annotation[] extraAnnotations) {
AnnotationStore annotations = new AnnotationStore(classOfT.getAnnotations(), extraAnnotations);
Asn1Default defaultAnnotation = annotations.getAnnotation(Asn1Default.class);
if (defaultAnnotation == null) return null;
for (Object c : classOfT.getEnumConstants()) {
if (c.toString().equals(defaultAnnotation.value())) {
return (T) c;
}
}
return null;
}
}
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