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com.strobel.reflection.GenericParameter Maven / Gradle / Ivy
/*
* GenericParameter.java
*
* Copyright (c) 2012 Mike Strobel
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0.
* A copy of the license can be found in the License.html file at the root of this distribution.
* By using this source code in any fashion, you are agreeing to be bound by the terms of the
* Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*/
package com.strobel.reflection;
import com.strobel.annotations.NotNull;
import com.strobel.core.Comparer;
import com.strobel.core.HashUtilities;
import com.strobel.core.VerifyArgument;
import com.strobel.reflection.emit.GenericParameterBuilder;
import javax.lang.model.type.TypeKind;
import java.lang.annotation.Annotation;
import java.lang.reflect.TypeVariable;
/**
* @author Mike Strobel
*/
class GenericParameter extends Type {
private final String _name;
private final int _position;
private Type _upperBound;
private Type _lowerBound;
private MethodInfo _declaringMethod;
private Type _declaringType;
private Class _erasedClass;
private TypeVariable _typeVariable;
GenericParameter(final String name, final TypeVariable typeVariable, final int position) {
_typeVariable = typeVariable;
_name = VerifyArgument.notNull(name, "name");
_declaringType = null;
_upperBound = Types.Object;
_lowerBound = Bottom;
_position = position;
}
GenericParameter(final String name, final Type declaringType, final Type upperBound, final int position) {
_name = VerifyArgument.notNull(name, "name");
_declaringType = VerifyArgument.notNull(declaringType, "declaringType");
_upperBound = upperBound != null ? upperBound : Types.Object;
_lowerBound = Bottom;
_position = position;
}
GenericParameter(final String name, final MethodInfo declaringMethod, final Type upperBound, final int position) {
_name = VerifyArgument.notNull(name, "name");
_declaringType = null;
_declaringMethod = VerifyArgument.notNull(declaringMethod, "declaringMethod");
_upperBound = upperBound != null ? upperBound : Types.Object;
_lowerBound = Bottom;
_position = position;
}
protected GenericParameter(final String name, final Type declaringType, final Type upperBound, final Type lowerBound, final int position) {
_name = VerifyArgument.notNull(name, "name");
_declaringType = VerifyArgument.notNull(declaringType, "declaringType");
_upperBound = upperBound != null ? upperBound : Types.Object;
_lowerBound = lowerBound != null ? lowerBound : Type.Bottom;
_position = position;
}
protected GenericParameter(final String name, final MethodInfo declaringMethod, final Type upperBound, final Type lowerBound, final int position) {
_name = VerifyArgument.notNull(name, "name");
_declaringType = null;
_declaringMethod = VerifyArgument.notNull(declaringMethod, "declaringMethod");
_upperBound = upperBound != null ? upperBound : Types.Object;
_lowerBound = lowerBound != null ? lowerBound : Type.Bottom;
_position = position;
}
final void setUpperBound(final Type upperBound) {
_upperBound = upperBound;
}
final void setLowerBound(final Type lowerBound) {
_lowerBound = lowerBound;
}
@Override
public TypeList getExplicitInterfaces() {
return TypeList.empty();
}
private TypeVariable resolveTypeVariable() {
final TypeVariable[] parameters;
if (_declaringMethod != null) {
parameters = _declaringMethod.getRawMethod().getTypeParameters();
}
else {
parameters = _declaringType.getErasedClass().getTypeParameters();
}
for (final TypeVariable typeVariable : parameters) {
if (_name.equals(typeVariable.getName())) {
return typeVariable;
}
}
throw Error.couldNotResolveType(_name);
}
private Class resolveErasedClass() {
if (_upperBound != Types.Object) {
return _upperBound.getErasedClass();
}
return Object.class;
}
public TypeVariable getRawTypeVariable() {
if (_typeVariable == null) {
synchronized (CACHE_LOCK) {
if (_typeVariable == null) {
_typeVariable = resolveTypeVariable();
}
}
}
return _typeVariable;
}
@Override
public MemberType getMemberType() {
return MemberType.TypeInfo;
}
@Override
public String getFullName() {
return _name;
}
@Override
public StringBuilder appendBriefDescription(final StringBuilder sb) {
sb.append(getFullName());
final Type upperBound = getExtendsBound();
if (upperBound != null && upperBound != Types.Object) {
sb.append(" extends ");
if (upperBound.isGenericParameter() || upperBound == getDeclaringType()) {
return sb.append(upperBound.getFullName());
}
return upperBound.appendErasedDescription(sb);
}
return sb;
}
@Override
public StringBuilder appendSimpleDescription(final StringBuilder sb) {
return sb.append(getName());
}
@Override
public StringBuilder appendErasedDescription(final StringBuilder sb) {
return getExtendsBound().appendErasedDescription(sb);
}
@Override
public StringBuilder appendErasedSignature(final StringBuilder sb) {
return getExtendsBound().appendErasedSignature(sb);
}
@Override
public StringBuilder appendDescription(final StringBuilder sb) {
return appendBriefDescription(sb);
}
@Override
protected final StringBuilder _appendClassName(final StringBuilder sb, final boolean fullName, final boolean dottedName) {
return sb.append(_name);
}
@Override
public Type getDeclaringType() {
return _declaringType;
}
@Override
public MethodInfo getDeclaringMethod() {
return _declaringMethod;
}
public void setDeclaringMethod(final MethodInfo declaringMethod) {
_declaringMethod = declaringMethod;
}
public void setDeclaringType(final Type declaringType) {
_declaringType = declaringType;
}
@Override
public boolean isGenericParameter() {
return true;
}
@Override
public TypeKind getKind() {
return TypeKind.TYPEVAR;
}
@Override
public Type getSuperBound() {
return _lowerBound;
}
@Override
public Type getExtendsBound() {
return _upperBound;
}
@Override
@SuppressWarnings("unchecked")
public Class getErasedClass() {
if (_erasedClass == null) {
synchronized (CACHE_LOCK) {
if (_erasedClass == null) {
_erasedClass = (Class) resolveErasedClass();
}
}
}
return _erasedClass;
}
@Override
public int getGenericParameterPosition() {
return _position;
}
@Override
public int getModifiers() {
return 0;
}
@Override
public boolean isAnnotationPresent(final Class annotationClass) {
return false;
}
@Override
public T getAnnotation(final Class annotationClass) {
return null;
}
@NotNull
@Override
public Annotation[] getAnnotations() {
return new Annotation[0];
}
@NotNull
@Override
public Annotation[] getDeclaredAnnotations() {
return new Annotation[0];
}
@Override
public String toString() {
return getFullName();
}
@Override
public R accept(final TypeVisitor visitor, final P parameter) {
return visitor.visitTypeParameter(this, parameter);
}
@Override
public int hashCode() {
return HashUtilities.hashCode(_typeVariable);
}
@Override
public boolean isEquivalentTo(final Type member) {
if (member == this) {
return true;
}
if (member == null) {
return false;
}
if (member instanceof GenericParameter) {
if (member instanceof CapturedType) {
return false;
}
final GenericParameter other = (GenericParameter) member;
return other._position == _position &&
Comparer.equals(other.getRawTypeVariable(), _typeVariable);
}
if (member instanceof GenericParameterBuilder) {
return member.isEquivalentTo(this);
}
return false;
}
}
