/*
* Copyright (C) 2015, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.values;
import com.squareup.javapoet.ArrayTypeName;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.MethodSpec;
import java.lang.reflect.Method;
import static java.lang.String.format;
import static javax.lang.model.element.Modifier.*;
import static net.openhft.chronicle.values.IntegerFieldModel.NORMAL_ACCESS_TYPE;
import static net.openhft.chronicle.values.Nullability.NULLABLE;
class EnumFieldModel extends IntegerBackedFieldModel {
final FieldNullability nullability = new FieldNullability(this);
@Override
void addTypeInfo(Method m, MethodTemplate template) {
super.addTypeInfo(m, template);
nullability.addInfo(m, template);
}
@Override
void postProcess() {
super.postProcess();
int min = nullable() ? -1 : 0;
int constants = Enums.numberOfConstants(type);
if (constants == 0) {
throw new IllegalStateException(
name + "field type is a enum with zero constants: " + type);
}
backend.type = int.class;
backend.range = new RangeImpl(min, constants - 1);
backend.postProcess();
}
private boolean nullable() {
return nullability.nullability() == NULLABLE;
}
final MemberGenerator nativeGenerator = new IntegerBackedNativeMemberGenerator(this, backend) {
@Override
public void generateFields(ValueBuilder valueBuilder) {
addUniverseField(valueBuilder);
}
@Override
void generateArrayElementFields(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder) {
addUniverseField(valueBuilder);
}
@Override
void finishGet(ValueBuilder valueBuilder, MethodSpec.Builder methodBuilder, String value) {
methodBuilder.addStatement("return $N", fromOrdinalOrMinusOne(methodBuilder, value));
}
@Override
String startSet(MethodSpec.Builder methodBuilder) {
return toOrdinalOrMinusOne(varName());
}
@Override
void generateEquals(ValueBuilder valueBuilder, MethodSpec.Builder methodBuilder) {
String value = fromOrdinalOrMinusOne(methodBuilder,
backingFieldModel.genGet(valueBuilder, NORMAL_ACCESS_TYPE));
methodBuilder.addCode("if (($N) != other.$N()) return false;\n",
value, getOrGetVolatile().getName());
}
@Override
void generateArrayElementEquals(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder,
MethodSpec.Builder methodBuilder) {
String value = fromOrdinalOrMinusOne(methodBuilder,
backingFieldModel.genArrayElementGet(
arrayFieldModel, valueBuilder, methodBuilder, NORMAL_ACCESS_TYPE));
methodBuilder.addCode("if (($N) != other.$N(index)) return false;\n",
value, arrayFieldModel.getOrGetVolatile().getName());
}
@Override
String generateHashCode(ValueBuilder valueBuilder, MethodSpec.Builder methodBuilder) {
String value = fromOrdinalOrMinusOne(methodBuilder,
backingFieldModel.genGet(valueBuilder, NORMAL_ACCESS_TYPE));
return format("java.util.Objects.hashCode(%s)", value);
}
@Override
String generateArrayElementHashCode(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder,
MethodSpec.Builder methodBuilder) {
String value = fromOrdinalOrMinusOne(methodBuilder,
backingFieldModel.genArrayElementGet(
arrayFieldModel, valueBuilder, methodBuilder, NORMAL_ACCESS_TYPE));
return format("java.util.Objects.hashCode(%s)", value);
}
};
private String universeName() {
return name + "Universe";
}
private void addUniverseField(ValueBuilder valueBuilder) {
FieldSpec universe = FieldSpec
.builder(ArrayTypeName.of(type), universeName())
.addModifiers(PRIVATE, STATIC, FINAL)
.initializer("$T.getUniverse($T.class)", Enums.class, type)
.build();
valueBuilder.typeBuilder.addField(universe);
}
private String toOrdinalOrMinusOne(String e) {
if (nullable()) {
return format("(%s != null ? %s.ordinal() : -1)", e, e);
} else {
return e + ".ordinal()";
}
}
private String fromOrdinalOrMinusOne(MethodSpec.Builder methodBuilder, String value) {
if (nullable()) {
String ordinalVariableName = name() + "Ordinal";
methodBuilder.addStatement(format("int %s = %s", ordinalVariableName, value));
return format("%s >= 0 ? %s[%s] : null", ordinalVariableName, universeName(), ordinalVariableName);
} else {
return format("%s[%s]", universeName(), value);
}
}
@Override
MemberGenerator nativeGenerator() {
return nativeGenerator;
}
@Override
MemberGenerator createHeapGenerator() {
return new ObjectHeapMemberGenerator(this) {
@Override
public void generateFields(ValueBuilder valueBuilder) {
super.generateFields(valueBuilder);
addUniverseField(valueBuilder);
}
@Override
void generateArrayElementFields(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder) {
super.generateArrayElementFields(arrayFieldModel, valueBuilder);
addUniverseField(valueBuilder);
}
@Override
void generateWriteMarshallable(
ValueBuilder valueBuilder, MethodSpec.Builder methodBuilder) {
methodBuilder.addStatement("bytes.writeStopBit($N)",
toOrdinalOrMinusOne(fieldName()));
}
@Override
void generateArrayElementWriteMarshallable(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder,
MethodSpec.Builder methodBuilder) {
methodBuilder.addStatement("bytes.writeStopBit($N))",
toOrdinalOrMinusOne(fieldName() + "[index]"));
}
@Override
void generateReadMarshallable(
ValueBuilder valueBuilder, MethodSpec.Builder methodBuilder) {
methodBuilder.addStatement("$N = $N", fieldName(),
fromOrdinalOrMinusOne(methodBuilder, "(int) bytes.readStopBit()"));
}
@Override
void generateArrayElementReadMarshallable(
ArrayFieldModel arrayFieldModel, ValueBuilder valueBuilder,
MethodSpec.Builder methodBuilder) {
methodBuilder.addStatement("$N[index] = $N", fieldName(),
fromOrdinalOrMinusOne(methodBuilder, "(int) bytes.readStopBit()"));
}
};
}
}