xy.reflect.ui.util.Parameter Maven / Gradle / Ivy
package xy.reflect.ui.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
public class Parameter extends AccessibleObject {
public static final String NO_NAME = "";
private final Member invokable;
private final int position;
private Class[] invokableParameterTypes;
private Annotation[][] invokableParameterAnnotations;
private String name;
public Parameter(Member invokable, int position) {
this.invokable = invokable;
this.position = position;
if (invokable instanceof Method) {
Method method = (Method) invokable;
this.invokableParameterTypes = method.getParameterTypes();
this.invokableParameterAnnotations = method.getParameterAnnotations();
} else if (invokable instanceof Constructor) {
Constructor constructor = (Constructor) invokable;
this.invokableParameterTypes = constructor.getParameterTypes();
this.invokableParameterAnnotations = constructor.getParameterAnnotations();
} else {
throw new ReflectionUIError();
}
}
public Class getType() {
return invokableParameterTypes[position];
}
public Member getDeclaringInvokable() {
return invokable;
}
public int getPosition() {
return position;
}
public Class[] getDeclaringInvokableParameterTypes() {
return invokableParameterTypes;
}
public Annotation[][] getDeclaringInvokableParameterAnnotations() {
return invokableParameterAnnotations;
}
public String getName() {
if (name == null) {
String[] parameterNames = ReflectionUIUtils.getJavaParameterNames(invokable);
if (parameterNames == null) {
name = NO_NAME;
} else {
name = parameterNames[position];
}
}
return name;
}
@Override
public boolean isAnnotationPresent(Class annotationType) {
return getAnnotation(annotationType) != null;
}
@Override
public A getAnnotation(Class annotationType) {
for (Annotation annotation : invokableParameterAnnotations[position]) {
if (annotationType.isInstance(annotation)) {
return annotationType.cast(annotation);
}
}
return null;
}
@Override
public Annotation[] getAnnotations() {
return getDeclaredAnnotations();
}
@Override
public Annotation[] getDeclaredAnnotations() {
return invokableParameterAnnotations[position];
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((invokable == null) ? 0 : invokable.hashCode());
result = prime * result + position;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Parameter other = (Parameter) obj;
if (invokable == null) {
if (other.invokable != null)
return false;
} else if (!invokable.equals(other.invokable))
return false;
if (position != other.position)
return false;
return true;
}
@Override
public String toString() {
return getType() + " arg" + position;
}
}