com.fitbur.bytebuddy.description.enumeration.EnumerationDescription Maven / Gradle / Ivy
package com.fitbur.bytebuddy.description.enumeration;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import java.util.ArrayList;
import java.util.List;
/**
* Describes an enumeration value. Note that the {@link java.lang.Object#toString} method always returns the
* value as if the method was not overridden, i.e. the name of the enumeration constant.
*/
public interface EnumerationDescription {
/**
* Returns the name of this instance's enumeration value.
*
* @return The name of this enumeration constant.
*/
String getValue();
/**
* Returns the type of this enumeration.
*
* @return The type of this enumeration.
*/
TypeDescription getEnumerationType();
/**
* Prepares this enumeration value to be loaded.
*
* @param type A type constant representing the enumeration value.
* @param The enumeration type.
* @return The loaded enumeration constant corresponding to this value.
*/
> T load(Class type);
/**
* An adapter implementation of an enumeration description.
*/
abstract class AbstractBase implements EnumerationDescription {
@Override
public boolean equals(Object other) {
return other == this || other instanceof EnumerationDescription
&& (((EnumerationDescription) other)).getEnumerationType().equals(getEnumerationType())
&& (((EnumerationDescription) other)).getValue().equals(getValue());
}
@Override
public int hashCode() {
return getValue().hashCode() + 31 * getEnumerationType().hashCode();
}
@Override
public String toString() {
return getValue();
}
}
/**
* An enumeration description representing a loaded enumeration.
*/
class ForLoadedEnumeration extends AbstractBase {
/**
* The loaded enumeration value.
*/
private final Enum value;
/**
* Creates a new enumeration value representation for a loaded enumeration.
*
* @param value The value to represent.
*/
public ForLoadedEnumeration(Enum value) {
this.value = value;
}
/**
* Enlists a given array of loaded enumerations as enumeration values.
*
* @param enumerations The enumerations to represent.
* @return A list of the given enumerations.
*/
public static List asList(Enum[] enumerations) {
List result = new ArrayList(enumerations.length);
for (Enum enumeration : enumerations) {
result.add(new ForLoadedEnumeration(enumeration));
}
return result;
}
@Override
public String getValue() {
return value.name();
}
@Override
public TypeDescription getEnumerationType() {
return new TypeDescription.ForLoadedType(value.getDeclaringClass());
}
@Override
@SuppressWarnings("unchecked")
public > T load(Class type) {
if (value.getDeclaringClass() != type) {
throw new IllegalArgumentException(type + " does not represent " + value);
}
return (T) value;
}
}
/**
* A latent description of an enumeration value.
*/
class Latent extends AbstractBase {
/**
* The type of the enumeration.
*/
private final TypeDescription enumerationType;
/**
* The value of the enumeration.
*/
private final String value;
/**
* Creates a latent description of an enumeration value.
*
* @param enumerationType The enumeration type.
* @param value The value of the enumeration.
*/
public Latent(TypeDescription enumerationType, String value) {
this.enumerationType = enumerationType;
this.value = value;
}
@Override
public String getValue() {
return value;
}
@Override
public TypeDescription getEnumerationType() {
return enumerationType;
}
@Override
public > T load(Class type) {
if (!enumerationType.represents(type)) {
throw new IllegalArgumentException(type + " does not represent " + enumerationType);
}
return Enum.valueOf(type, value);
}
}
}