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package com.sun.beans;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.Arrays;
This class implements WildcardType compatibly with the JDK's WildcardTypeImpl. Unfortunately we can't use the JDK's WildcardTypeImpl here as we do for ParameterizedTypeImpl and GenericArrayTypeImpl, because WildcardTypeImpl's constructor takes parameters representing intermediate structures obtained during class-file parsing. We could reconstruct versions of those structures but it would be more trouble than it's worth. Author: Eamonn McManus, Sergey Malenkov Since: 1.7
/**
* This class implements {@link WildcardType WildcardType} compatibly with the JDK's
* {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl}.
* Unfortunately we can't use the JDK's
* {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl} here as we do for
* {@link sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl ParameterizedTypeImpl} and
* {@link sun.reflect.generics.reflectiveObjects.GenericArrayTypeImpl GenericArrayTypeImpl},
* because {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl}'s
* constructor takes parameters representing intermediate structures obtained during class-file parsing.
* We could reconstruct versions of those structures but it would be more trouble than it's worth.
*
* @since 1.7
*
* @author Eamonn McManus
* @author Sergey Malenkov
*/
final class WildcardTypeImpl implements WildcardType {
private final Type[] upperBounds;
private final Type[] lowerBounds;
Creates a wildcard type with the requested bounds.
Note that the array arguments are not cloned
because instances of this class are never constructed
from outside the containing package.
Params: - upperBounds – the array of types representing
the upper bound(s) of this type variable
- lowerBounds – the array of types representing
the lower bound(s) of this type variable
/**
* Creates a wildcard type with the requested bounds.
* Note that the array arguments are not cloned
* because instances of this class are never constructed
* from outside the containing package.
*
* @param upperBounds the array of types representing
* the upper bound(s) of this type variable
* @param lowerBounds the array of types representing
* the lower bound(s) of this type variable
*/
WildcardTypeImpl(Type[] upperBounds, Type[] lowerBounds) {
this.upperBounds = upperBounds;
this.lowerBounds = lowerBounds;
}
Returns an array of Type objects representing the upper bound(s) of this type variable. Note that if no upper bound is explicitly declared, the upper bound is Object. Returns: an array of types representing
the upper bound(s) of this type variable
/**
* Returns an array of {@link Type Type} objects
* representing the upper bound(s) of this type variable.
* Note that if no upper bound is explicitly declared,
* the upper bound is {@link Object Object}.
*
* @return an array of types representing
* the upper bound(s) of this type variable
*/
public Type[] getUpperBounds() {
return this.upperBounds.clone();
}
Returns an array of Type objects representing the lower bound(s) of this type variable. Note that if no lower bound is explicitly declared, the lower bound is the type of null. In this case, a zero length array is returned. Returns: an array of types representing
the lower bound(s) of this type variable
/**
* Returns an array of {@link Type Type} objects
* representing the lower bound(s) of this type variable.
* Note that if no lower bound is explicitly declared,
* the lower bound is the type of {@code null}.
* In this case, a zero length array is returned.
*
* @return an array of types representing
* the lower bound(s) of this type variable
*/
public Type[] getLowerBounds() {
return this.lowerBounds.clone();
}
Indicates whether some other object is "equal to" this one. It is implemented compatibly with the JDK's WildcardTypeImpl. Params: - object – the reference object with which to compare
See Also: Returns: true if this object is the same as the object argument; false otherwise
/**
* Indicates whether some other object is "equal to" this one.
* It is implemented compatibly with the JDK's
* {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl}.
*
* @param object the reference object with which to compare
* @return {@code true} if this object is the same as the object argument;
* {@code false} otherwise
* @see sun.reflect.generics.reflectiveObjects.WildcardTypeImpl#equals
*/
@Override
public boolean equals(Object object) {
if (object instanceof WildcardType) {
WildcardType type = (WildcardType) object;
return Arrays.equals(this.upperBounds, type.getUpperBounds())
&& Arrays.equals(this.lowerBounds, type.getLowerBounds());
}
return false;
}
Returns a hash code value for the object. It is implemented compatibly with the JDK's WildcardTypeImpl. See Also: Returns: a hash code value for this object
/**
* Returns a hash code value for the object.
* It is implemented compatibly with the JDK's
* {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl}.
*
* @return a hash code value for this object
* @see sun.reflect.generics.reflectiveObjects.WildcardTypeImpl#hashCode
*/
@Override
public int hashCode() {
return Arrays.hashCode(this.upperBounds)
^ Arrays.hashCode(this.lowerBounds);
}
Returns a string representation of the object. It is implemented compatibly with the JDK's WildcardTypeImpl. See Also: Returns: a string representation of the object
/**
* Returns a string representation of the object.
* It is implemented compatibly with the JDK's
* {@link sun.reflect.generics.reflectiveObjects.WildcardTypeImpl WildcardTypeImpl}.
*
* @return a string representation of the object
* @see sun.reflect.generics.reflectiveObjects.WildcardTypeImpl#toString
*/
@Override
public String toString() {
StringBuilder sb;
Type[] bounds;
if (this.lowerBounds.length == 0) {
if (this.upperBounds.length == 0 || Object.class == this.upperBounds[0]) {
return "?";
}
bounds = this.upperBounds;
sb = new StringBuilder("? extends ");
}
else {
bounds = this.lowerBounds;
sb = new StringBuilder("? super ");
}
for (int i = 0; i < bounds.length; i++) {
if (i > 0) {
sb.append(" & ");
}
sb.append((bounds[i] instanceof Class)
? ((Class) bounds[i]).getName()
: bounds[i].toString());
}
return sb.toString();
}
}