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package com.fitbur.bytebuddy.dynamic.scaffold;
import com.fitbur.bytebuddy.description.field.FieldDescription;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import com.fitbur.bytebuddy.dynamic.FieldTransformer;
import com.fitbur.bytebuddy.implementation.attribute.FieldAttributeAppender;
import com.fitbur.bytebuddy.matcher.ElementMatcher;
import com.fitbur.bytebuddy.matcher.LatentMatcher;
import java.util.*;
/**
* A field registry represents an extendable collection of fields which are identified by their names that are mapped
* to a given {@link com.fitbur.bytebuddy.implementation.attribute.FieldAttributeAppender}. Fields
* can be uniquely identified by their name for a given type since fields are never inherited.
*
* This registry is the counterpart of a {@link com.fitbur.bytebuddy.dynamic.scaffold.MethodRegistry}.
* However, a field registry is implemented simpler since it does not have to deal with complex signatures or
* inheritance. For the sake of consistency, the field registry follows however a similar pattern without introducing
* unnecessary complexity.
*/
public interface FieldRegistry {
/**
* Prepends the given field definition to this field registry, i.e. this configuration is applied first.
*
* @param matcher The matcher to identify any field that this definition concerns.
* @param fieldAttributeAppenderFactory The field attribute appender factory to apply on any matched field.
* @param defaultValue The default value to write to the field or {@code null} if no default value is to be set for the field.
* @param fieldTransformer The field transformer to apply to any matched field.
* @return An adapted version of this method registry.
*/
FieldRegistry prepend(LatentMatcher matcher,
FieldAttributeAppender.Factory fieldAttributeAppenderFactory,
Object defaultValue,
FieldTransformer fieldTransformer);
/**
* Prepares the field registry for a given instrumented type.
*
* @param instrumentedType The instrumented type.
* @return A prepared field registry.
*/
Compiled compile(TypeDescription instrumentedType);
/**
* Represents a compiled field registry.
*/
interface Compiled extends TypeWriter.FieldPool {
/**
* A no-op field registry that does not register annotations for any field.
*/
enum NoOp implements Compiled {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public Record target(FieldDescription fieldDescription) {
return new Record.ForImplicitField(fieldDescription);
}
@Override
public String toString() {
return "FieldRegistry.Compiled.NoOp." + name();
}
}
}
/**
* An immutable default implementation of a field registry.
*/
class Default implements FieldRegistry {
/**
* This registries entries.
*/
private final List entries;
/**
* Creates a new empty default field registry.
*/
public Default() {
this(Collections.emptyList());
}
/**
* Creates a new default field registry.
*
* @param entries The entries of the field registry.
*/
private Default(List entries) {
this.entries = entries;
}
@Override
public FieldRegistry prepend(LatentMatcher matcher,
FieldAttributeAppender.Factory fieldAttributeAppenderFactory,
Object defaultValue,
FieldTransformer fieldTransformer) {
List entries = new ArrayList(this.entries.size() + 1);
entries.add(new Entry(matcher, fieldAttributeAppenderFactory, defaultValue, fieldTransformer));
entries.addAll(this.entries);
return new Default(entries);
}
@Override
public FieldRegistry.Compiled compile(TypeDescription instrumentedType) {
List entries = new ArrayList(this.entries.size());
Map fieldAttributeAppenders = new HashMap();
for (Entry entry : this.entries) {
FieldAttributeAppender fieldAttributeAppender = fieldAttributeAppenders.get(entry.getFieldAttributeAppenderFactory());
if (fieldAttributeAppender == null) {
fieldAttributeAppender = entry.getFieldAttributeAppenderFactory().make(instrumentedType);
fieldAttributeAppenders.put(entry.getFieldAttributeAppenderFactory(), fieldAttributeAppender);
}
entries.add(new Compiled.Entry(entry.resolve(instrumentedType), fieldAttributeAppender, entry.getDefaultValue(), entry.getTransformer()));
}
return new Compiled(instrumentedType, entries);
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& entries.equals(((Default) other).entries);
}
@Override
public int hashCode() {
return entries.hashCode();
}
@Override
public String toString() {
return "FieldRegistry.Default{entries=" + entries + '}';
}
/**
* An entry of the default field registry.
*/
protected static class Entry implements LatentMatcher {
/**
* The matcher to identify any field that this definition concerns.
*/
private final LatentMatcher matcher;
/**
* The field attribute appender factory to apply on any matched field.
*/
private final FieldAttributeAppender.Factory fieldAttributeAppenderFactory;
/**
* The default value to write to the field or {@code null} if no default value is to be set for the field.
*/
private final Object defaultValue;
/**
* The field transformer to apply to any matched field.
*/
private final FieldTransformer fieldTransformer;
/**
* Creates a new entry.
*
* @param matcher The matcher to identify any field that this definition concerns.
* @param fieldAttributeAppenderFactory The field attribute appender factory to apply on any matched field.
* @param defaultValue The default value to write to the field or {@code null} if no default value is to be set for the field.
* @param fieldTransformer The field transformer to apply to any matched field.
*/
protected Entry(LatentMatcher matcher,
FieldAttributeAppender.Factory fieldAttributeAppenderFactory,
Object defaultValue,
FieldTransformer fieldTransformer) {
this.matcher = matcher;
this.fieldAttributeAppenderFactory = fieldAttributeAppenderFactory;
this.defaultValue = defaultValue;
this.fieldTransformer = fieldTransformer;
}
/**
* Returns the field attribute appender factory to apply on any matched field.
*
* @return The field attribute appender factory to apply on any matched field.
*/
protected FieldAttributeAppender.Factory getFieldAttributeAppenderFactory() {
return fieldAttributeAppenderFactory;
}
/**
* Returns the default value to write to the field or {@code null} if no default value is to be set for the field.
*
* @return The default value to write to the field or {@code null} if no default value is to be set for the field.
*/
protected Object getDefaultValue() {
return defaultValue;
}
/**
* Returns the field transformer to apply to any matched field.
*
* @return The field transformer to apply to any matched field.
*/
protected FieldTransformer getTransformer() {
return fieldTransformer;
}
@Override
public ElementMatcher resolve(TypeDescription instrumentedType) {
return matcher.resolve(instrumentedType);
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
Entry entry = (Entry) other;
return matcher.equals(entry.matcher)
&& fieldAttributeAppenderFactory.equals(entry.fieldAttributeAppenderFactory)
&& !(defaultValue != null ? !defaultValue.equals(entry.defaultValue) : entry.defaultValue != null)
&& fieldTransformer.equals(entry.fieldTransformer);
}
@Override
public int hashCode() {
int result = matcher.hashCode();
result = 31 * result + fieldAttributeAppenderFactory.hashCode();
result = 31 * result + (defaultValue != null ? defaultValue.hashCode() : 0);
result = 31 * result + fieldTransformer.hashCode();
return result;
}
@Override
public String toString() {
return "FieldRegistry.Default.Entry{" +
"matcher=" + matcher +
", fieldAttributeAppenderFactory=" + fieldAttributeAppenderFactory +
", defaultValue=" + defaultValue +
", fieldTransformer=" + fieldTransformer +
'}';
}
}
/**
* A compiled default field registry.
*/
protected static class Compiled implements FieldRegistry.Compiled {
/**
* The instrumented type for which this registry was compiled for.
*/
private final TypeDescription instrumentedType;
/**
* The entries of this compiled field registry.
*/
private final List entries;
/**
* Creates a new compiled field registry.
*
* @param instrumentedType The instrumented type for which this registry was compiled for.
* @param entries The entries of this compiled field registry.
*/
protected Compiled(TypeDescription instrumentedType, List entries) {
this.instrumentedType = instrumentedType;
this.entries = entries;
}
@Override
public Record target(FieldDescription fieldDescription) {
for (Entry entry : entries) {
if (entry.matches(fieldDescription)) {
return entry.bind(instrumentedType, fieldDescription);
}
}
return new Record.ForImplicitField(fieldDescription);
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& entries.equals(((Compiled) other).entries)
&& instrumentedType.equals(((Compiled) other).instrumentedType);
}
@Override
public int hashCode() {
return 31 * instrumentedType.hashCode() + entries.hashCode();
}
@Override
public String toString() {
return "FieldRegistry.Default.Compiled{" +
"instrumentedType=" + instrumentedType +
", entries=" + entries +
'}';
}
/**
* An entry of a compiled field registry.
*/
protected static class Entry implements ElementMatcher {
/**
* The matcher to identify any field that this definition concerns.
*/
private final ElementMatcher matcher;
/**
* The field attribute appender to apply on any matched field.
*/
private final FieldAttributeAppender fieldAttributeAppender;
/**
* The default value to write to the field or {@code null} if no default value is to be set for the field.
*/
private final Object defaultValue;
/**
* The field transformer to apply to any matched field.
*/
private final FieldTransformer fieldTransformer;
/**
* Creates a new entry.
*
* @param matcher The matcher to identify any field that this definition concerns.
* @param fieldAttributeAppender The field attribute appender to apply on any matched field.
* @param defaultValue The default value to write to the field or {@code null} if no default value is to be set for the field.
* @param fieldTransformer The field transformer to apply to any matched field.
*/
protected Entry(ElementMatcher matcher,
FieldAttributeAppender fieldAttributeAppender,
Object defaultValue,
FieldTransformer fieldTransformer) {
this.matcher = matcher;
this.fieldAttributeAppender = fieldAttributeAppender;
this.defaultValue = defaultValue;
this.fieldTransformer = fieldTransformer;
}
/**
* Binds this entry to the provided field description.
*
* @param instrumentedType The instrumented type for which this entry applies.
* @param fieldDescription The field description to be bound to this entry.
* @return A record representing the binding of this entry to the provided field.
*/
protected Record bind(TypeDescription instrumentedType, FieldDescription fieldDescription) {
return new Record.ForExplicitField(fieldAttributeAppender, defaultValue, fieldTransformer.transform(instrumentedType, fieldDescription));
}
@Override
public boolean matches(FieldDescription target) {
return matcher.matches(target);
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
Entry entry = (Entry) other;
return matcher.equals(entry.matcher)
&& fieldAttributeAppender.equals(entry.fieldAttributeAppender)
&& !(defaultValue != null ? !defaultValue.equals(entry.defaultValue) : entry.defaultValue != null)
&& fieldTransformer.equals(entry.fieldTransformer);
}
@Override
public int hashCode() {
int result = matcher.hashCode();
result = 31 * result + fieldAttributeAppender.hashCode();
result = 31 * result + (defaultValue != null ? defaultValue.hashCode() : 0);
result = 31 * result + fieldTransformer.hashCode();
return result;
}
@Override
public String toString() {
return "FieldRegistry.Default.Compiled.Entry{" +
"matcher=" + matcher +
", fieldAttributeAppender=" + fieldAttributeAppender +
", defaultValue=" + defaultValue +
", fieldTransformer=" + fieldTransformer +
'}';
}
}
}
}
}
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