net.bytebuddy.description.field.FieldDescription Maven / Gradle / Ivy
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Byte Buddy is a Java library for creating Java classes at run time.
This artifact is a build of Byte Buddy with a remaining dependency onto ASM.
You should never depend on this module without repackaging Byte Buddy and ASM into your own namespace.
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.bytebuddy.description.field;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.build.CachedReturnPlugin;
import net.bytebuddy.description.ByteCodeElement;
import net.bytebuddy.description.DeclaredByType;
import net.bytebuddy.description.ModifierReviewable;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.annotation.AnnotationList;
import net.bytebuddy.description.type.TypeDefinition;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.matcher.ElementMatcher;
import net.bytebuddy.utility.nullability.AlwaysNull;
import net.bytebuddy.utility.nullability.MaybeNull;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.signature.SignatureWriter;
import javax.annotation.Nonnull;
import java.lang.reflect.Field;
import java.lang.reflect.GenericSignatureFormatError;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.List;
/**
* Implementations of this interface describe a Java field. Implementations of this interface must provide meaningful
* {@code equal(Object)} and {@code hashCode()} implementations.
*/
public interface FieldDescription extends ModifierReviewable.ForFieldDescription,
DeclaredByType.WithMandatoryDeclaration,
ByteCodeElement.Member,
ByteCodeElement.TypeDependant {
/**
* A representative of a field's non-set default value.
*/
@AlwaysNull
Object NO_DEFAULT_VALUE = null;
/**
* {@inheritDoc}
*/
@Nonnull
TypeDefinition getDeclaringType();
/**
* Returns the type of the described field.
*
* @return The type of the described field.
*/
TypeDescription.Generic getType();
/**
* Returns the field's actual modifiers as it is present in a class file, i.e. its modifiers including
* a flag if this field is deprecated.
*
* @return The field's actual modifiers.
*/
int getActualModifiers();
/**
* Returns a signature token representing this field.
*
* @return A signature token representing this field.
*/
SignatureToken asSignatureToken();
/**
* Represents a field description in its generic shape, i.e. in the shape it is defined by a generic or raw type.
*/
interface InGenericShape extends FieldDescription {
/**
* {@inheritDoc}
*/
@Nonnull
TypeDescription.Generic getDeclaringType();
}
/**
* Represents a field in its defined shape, i.e. in the form it is defined by a class without its type variables being resolved.
*/
interface InDefinedShape extends FieldDescription {
/**
* {@inheritDoc}
*/
@Nonnull
TypeDescription getDeclaringType();
/**
* An abstract base implementation of a field description in its defined shape.
*/
abstract class AbstractBase extends FieldDescription.AbstractBase implements InDefinedShape {
/**
* {@inheritDoc}
*/
public InDefinedShape asDefined() {
return this;
}
}
}
/**
* An abstract base implementation of a field description.
*/
abstract class AbstractBase extends ModifierReviewable.AbstractBase implements FieldDescription {
/**
* {@inheritDoc}
*/
public String getInternalName() {
return getName();
}
/**
* {@inheritDoc}
*/
public String getActualName() {
return getName();
}
/**
* {@inheritDoc}
*/
public String getDescriptor() {
return getType().asErasure().getDescriptor();
}
/**
* {@inheritDoc}
*/
@MaybeNull
public String getGenericSignature() {
TypeDescription.Generic fieldType = getType();
try {
return fieldType.getSort().isNonGeneric()
? NON_GENERIC_SIGNATURE
: fieldType.accept(new TypeDescription.Generic.Visitor.ForSignatureVisitor(new SignatureWriter())).toString();
} catch (GenericSignatureFormatError ignored) {
return NON_GENERIC_SIGNATURE;
}
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public boolean isVisibleTo(TypeDescription typeDescription) {
return getDeclaringType().asErasure().isVisibleTo(typeDescription)
&& (isPublic()
|| typeDescription.equals(getDeclaringType().asErasure())
|| isProtected() && getDeclaringType().asErasure().isAssignableFrom(typeDescription)
|| !isPrivate() && typeDescription.isSamePackage(getDeclaringType().asErasure())
|| isPrivate() && typeDescription.isNestMateOf(getDeclaringType().asErasure()));
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public boolean isAccessibleTo(TypeDescription typeDescription) {
return isPublic()
|| typeDescription.equals(getDeclaringType().asErasure())
|| !isPrivate() && typeDescription.isSamePackage(getDeclaringType().asErasure())
|| isPrivate() && typeDescription.isNestMateOf(getDeclaringType().asErasure());
}
/**
* {@inheritDoc}
*/
public int getActualModifiers() {
return getModifiers() | (getDeclaredAnnotations().isAnnotationPresent(Deprecated.class)
? Opcodes.ACC_DEPRECATED
: EMPTY_MASK);
}
/**
* {@inheritDoc}
*/
public FieldDescription.Token asToken(ElementMatcher matcher) {
return new FieldDescription.Token(getName(),
getModifiers(),
getType().accept(new TypeDescription.Generic.Visitor.Substitutor.ForDetachment(matcher)),
getDeclaredAnnotations());
}
/**
* {@inheritDoc}
*/
public SignatureToken asSignatureToken() {
return new SignatureToken(getInternalName(), getType().asErasure());
}
@Override
@CachedReturnPlugin.Enhance("hashCode")
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public int hashCode() {
return getDeclaringType().hashCode() + 31 * (17 + getName().hashCode());
}
@Override
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (!(other instanceof FieldDescription)) {
return false;
}
FieldDescription fieldDescription = (FieldDescription) other;
return getName().equals(fieldDescription.getName()) && getDeclaringType().equals(fieldDescription.getDeclaringType());
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public String toGenericString() {
StringBuilder stringBuilder = new StringBuilder();
if (getModifiers() != EMPTY_MASK) {
stringBuilder.append(Modifier.toString(getModifiers())).append(' ');
}
stringBuilder.append(getType().getActualName()).append(' ');
stringBuilder.append(getDeclaringType().asErasure().getActualName()).append('.');
return stringBuilder.append(getName()).toString();
}
@Override
@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "Assuming declaring type for type member.")
public String toString() {
StringBuilder stringBuilder = new StringBuilder();
if (getModifiers() != EMPTY_MASK) {
stringBuilder.append(Modifier.toString(getModifiers())).append(' ');
}
stringBuilder.append(getType().asErasure().getActualName()).append(' ');
stringBuilder.append(getDeclaringType().asErasure().getActualName()).append('.');
return stringBuilder.append(getName()).toString();
}
}
/**
* An implementation of a field description for a loaded field.
*/
class ForLoadedField extends InDefinedShape.AbstractBase {
/**
* The represented loaded field.
*/
private final Field field;
/**
* Creates an immutable field description for a loaded field.
*
* @param field The represented field.
*/
public ForLoadedField(Field field) {
this.field = field;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
if (TypeDescription.AbstractBase.RAW_TYPES) {
return TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(field.getType());
}
return new TypeDescription.Generic.LazyProjection.ForLoadedFieldType(field);
}
/**
* {@inheritDoc}
*/
@CachedReturnPlugin.Enhance("declaredAnnotations")
public AnnotationList getDeclaredAnnotations() {
return new AnnotationList.ForLoadedAnnotations(field.getDeclaredAnnotations());
}
/**
* {@inheritDoc}
*/
public String getName() {
return field.getName();
}
/**
* {@inheritDoc}
*/
@Nonnull
public TypeDescription getDeclaringType() {
return TypeDescription.ForLoadedType.of(field.getDeclaringClass());
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return field.getModifiers();
}
/**
* {@inheritDoc}
*/
public boolean isSynthetic() {
return field.isSynthetic();
}
}
/**
* A latent field description describes a field that is not attached to a declaring
* {@link TypeDescription}.
*/
class Latent extends InDefinedShape.AbstractBase {
/**
* The type for which this field is defined.
*/
private final TypeDescription declaringType;
/**
* The name of the field.
*/
private final String name;
/**
* The field's modifiers.
*/
private final int modifiers;
/**
* The type of the field.
*/
private final TypeDescription.Generic fieldType;
/**
* The annotations of this field.
*/
private final List declaredAnnotations;
/**
* Creates a new latent field description. All provided types are attached to this instance before they are returned.
*
* @param declaringType The declaring type of the field.
* @param token A token representing the field's shape.
*/
public Latent(TypeDescription declaringType, FieldDescription.Token token) {
this(declaringType,
token.getName(),
token.getModifiers(),
token.getType(),
token.getAnnotations());
}
/**
* Creates a new latent field description. All provided types are attached to this instance before they are returned.
*
* @param declaringType The declaring type of the field.
* @param name The name of the field.
* @param fieldType The type of the field.
* @param modifiers The field's modifiers.
* @param declaredAnnotations The annotations of this field.
*/
public Latent(TypeDescription declaringType,
String name,
int modifiers,
TypeDescription.Generic fieldType,
List declaredAnnotations) {
this.declaringType = declaringType;
this.name = name;
this.modifiers = modifiers;
this.fieldType = fieldType;
this.declaredAnnotations = declaredAnnotations;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
return fieldType.accept(TypeDescription.Generic.Visitor.Substitutor.ForAttachment.of(this));
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
return new AnnotationList.Explicit(declaredAnnotations);
}
/**
* {@inheritDoc}
*/
public String getName() {
return name;
}
/**
* {@inheritDoc}
*/
@Nonnull
public TypeDescription getDeclaringType() {
return declaringType;
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return modifiers;
}
}
/**
* A field description that represents a given field but with a substituted field type.
*/
class TypeSubstituting extends AbstractBase implements InGenericShape {
/**
* The declaring type of the field.
*/
private final TypeDescription.Generic declaringType;
/**
* The represented field.
*/
private final FieldDescription fieldDescription;
/**
* A visitor that is applied to the field type.
*/
private final TypeDescription.Generic.Visitor visitor;
/**
* Creates a field description with a substituted field type.
*
* @param declaringType The declaring type of the field.
* @param fieldDescription The represented field.
* @param visitor A visitor that is applied to the field type.
*/
public TypeSubstituting(TypeDescription.Generic declaringType,
FieldDescription fieldDescription,
TypeDescription.Generic.Visitor visitor) {
this.declaringType = declaringType;
this.fieldDescription = fieldDescription;
this.visitor = visitor;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
return fieldDescription.getType().accept(visitor);
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
return fieldDescription.getDeclaredAnnotations();
}
/**
* {@inheritDoc}
*/
@Nonnull
public TypeDescription.Generic getDeclaringType() {
return declaringType;
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return fieldDescription.getModifiers();
}
/**
* {@inheritDoc}
*/
public String getName() {
return fieldDescription.getName();
}
/**
* {@inheritDoc}
*/
public InDefinedShape asDefined() {
return fieldDescription.asDefined();
}
}
/**
* A token representing a field's properties detached from a type.
*/
class Token implements ByteCodeElement.Token {
/**
* The name of the represented field.
*/
private final String name;
/**
* The modifiers of the represented field.
*/
private final int modifiers;
/**
* The type of the represented field.
*/
private final TypeDescription.Generic type;
/**
* The annotations of the represented field.
*/
private final List annotations;
/**
* Creates a new field token without annotations. The field type must be represented in its detached form.
*
* @param name The name of the represented field.
* @param modifiers The modifiers of the represented field.
* @param type The type of the represented field.
*/
public Token(String name, int modifiers, TypeDescription.Generic type) {
this(name, modifiers, type, Collections.emptyList());
}
/**
* Creates a new field token. The field type must be represented in its detached form.
*
* @param name The name of the represented field.
* @param modifiers The modifiers of the represented field.
* @param type The type of the represented field.
* @param annotations The annotations of the represented field.
*/
public Token(String name, int modifiers, TypeDescription.Generic type, List annotations) {
this.name = name;
this.modifiers = modifiers;
this.type = type;
this.annotations = annotations;
}
/**
* Returns the name of the represented field.
*
* @return The name of the represented field.
*/
public String getName() {
return name;
}
/**
* Returns the type of the represented field.
*
* @return The type of the represented field.
*/
public TypeDescription.Generic getType() {
return type;
}
/**
* Returns the modifiers of the represented field.
*
* @return The modifiers of the represented field.
*/
public int getModifiers() {
return modifiers;
}
/**
* Returns the annotations of the represented field.
*
* @return The annotations of the represented field.
*/
public AnnotationList getAnnotations() {
return new AnnotationList.Explicit(annotations);
}
/**
* {@inheritDoc}
*/
public Token accept(TypeDescription.Generic.Visitor visitor) {
return new Token(name,
modifiers,
type.accept(visitor),
annotations);
}
/**
* Creates a signature token that represents the method that is represented by this token.
*
* @param declaringType The declaring type of the field that this token represents.
* @return A signature token representing this token.
*/
public SignatureToken asSignatureToken(TypeDescription declaringType) {
return new SignatureToken(name, type.accept(new TypeDescription.Generic.Visitor.Reducing(declaringType)));
}
@Override
@CachedReturnPlugin.Enhance("hashCode")
public int hashCode() {
int result = name.hashCode();
result = 31 * result + modifiers;
result = 31 * result + type.hashCode();
result = 31 * result + annotations.hashCode();
return result;
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (other == null || getClass() != other.getClass()) {
return false;
}
Token token = (Token) other;
return modifiers == token.modifiers
&& name.equals(token.name)
&& type.equals(token.type)
&& annotations.equals(token.annotations);
}
}
/**
* A token that uniquely identifies a field by its name and type erasure.
*/
class SignatureToken {
/**
* The field's name.
*/
private final String name;
/**
* The field's raw type.
*/
private final TypeDescription type;
/**
* Creates a new signature token.
*
* @param name The field's name.
* @param type The field's raw type.
*/
public SignatureToken(String name, TypeDescription type) {
this.name = name;
this.type = type;
}
/**
* Returns the name of the represented field.
*
* @return The name of the represented field.
*/
public String getName() {
return name;
}
/**
* Returns the type of the represented field.
*
* @return The type of the represented field.
*/
public TypeDescription getType() {
return type;
}
@Override
@CachedReturnPlugin.Enhance("hashCode")
public int hashCode() {
int result = name.hashCode();
result = 31 * result + type.hashCode();
return result;
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (!(other instanceof SignatureToken)) {
return false;
}
SignatureToken signatureToken = (SignatureToken) other;
return name.equals(signatureToken.name) && type.equals(signatureToken.type);
}
@Override
public String toString() {
return type + " " + name;
}
}
}
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