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package org.jvnet.hk2.component;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Member;
import java.lang.annotation.Annotation;
/**
* Exception thrown by the injection manager when a dependency is not satisfied when
* performing injection.
*
* @author Jerome Dochez
*/
@SuppressWarnings("serial")
public class UnsatisfiedDependencyException extends ComponentException {
final AnnotatedElement member;
public UnsatisfiedDependencyException(AnnotatedElement target) {
this(target, null);
}
public UnsatisfiedDependencyException(AnnotatedElement target, Throwable cause) {
super(injection_failed_msg(target, cause), cause);
this.member = target;
}
public UnsatisfiedDependencyException(Field target, Throwable cause) {
super(injection_failed_msg(target, cause), cause);
this.member = target;
}
static String injection_failed_msg(AnnotatedElement t, Throwable cause) {
String msg;
if (Field.class.isInstance(t)) {
Field target = Field.class.cast(t);
msg = "injection failed on " + target.getDeclaringClass().getCanonicalName() + "." +
target.getName() + " with " + target.getGenericType();
} else {
msg = "injection failed on " + t;
}
return msg;
}
public boolean isField() {
return member instanceof Field;
}
public boolean isMethod() {
return member instanceof Method;
}
public String getUnsatisfiedName() {
String name = (member instanceof Member) ? ((Member)member).getName() : member.toString();
if (isMethod()) {
return name.substring(3).toLowerCase();
}
return name;
}
public AnnotatedElement getUnsatisfiedElement() {
try {
return AnnotatedElement.class.cast(member);
} catch(ClassCastException e) {
return null;
}
}
public <T extends Annotation> T getAnnotation(Class<T> annotationType) {
AnnotatedElement annotated = getUnsatisfiedElement();
if (annotated!=null) {
return annotated.getAnnotation(annotationType);
} else {
return null;
}
}
}