org.jvnet.hk2.component.UnsatisfiedDependencyException Maven / Gradle / Ivy

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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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 getAnnotation(Class annotationType) {
        AnnotatedElement annotated = getUnsatisfiedElement();
        if (annotated!=null) {
            return annotated.getAnnotation(annotationType);
        } else {
            return null;
        }
    }
}