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package org.glassfish.hk2.api;

import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;

/**
 * 

Supports inline instantiation of annotation type instances.

* *

An instance of an annotation type may be obtained by subclassing * AnnotationLiteral.

* *
 * public abstract class PayByQualifier 
 *       extends AnnotationLiteral<PayBy>
 *       implements PayBy {}
 * 
* *

* An extension of AnnotationLiteral must do two things:

    *
  1. Must have the target annotation as its generic type
  2. *
  3. Must implement the target type
  4. *
*

* In particular, in-line anonymous extensions of AnnotationLiteral will not * work because in-line anonymous extensions of AnnotationLiteral cannot implement * the target annotation * * @author jwells * * @param the annotation type */ public abstract class AnnotationLiteral implements Annotation, Serializable { /** * For serialization */ private static final long serialVersionUID = -3645430766814376616L; private transient Class annotationType; private transient Method[] members; protected AnnotationLiteral() { Class thisClass = this.getClass(); boolean foundAnnotation = false; for (Class iClass : thisClass.getInterfaces()) { if (iClass.isAnnotation()) { foundAnnotation = true; break; } } if (!foundAnnotation) { throw new IllegalStateException("The subclass " + thisClass.getName() + " of AnnotationLiteral must implement an Annotation"); } } private Method[] getMembers() { if (members==null) { members = AccessController.doPrivileged(new PrivilegedAction() { @Override public Method[] run() { return annotationType().getDeclaredMethods(); } }); if ( members.length>0 && !annotationType().isAssignableFrom(this.getClass()) ) { throw new RuntimeException(getClass() + " does not implement the annotation type with members " + annotationType().getName()); } } return members; } private static Class getAnnotationLiteralSubclass(Class clazz) { Class superclass = clazz.getSuperclass(); if (superclass.equals(AnnotationLiteral.class)) { return clazz; } else if (superclass.equals(Object.class)) { return null; } else { return (getAnnotationLiteralSubclass(superclass)); } } @SuppressWarnings("unchecked") private static Class getTypeParameter(Class annotationLiteralSuperclass) { Type type = annotationLiteralSuperclass.getGenericSuperclass(); if (type instanceof ParameterizedType) { ParameterizedType parameterizedType = (ParameterizedType) type; if (parameterizedType.getActualTypeArguments().length == 1) { return (Class) parameterizedType .getActualTypeArguments()[0]; } } return null; } public Class annotationType() { if (annotationType==null) { Class annotationLiteralSubclass = getAnnotationLiteralSubclass(this.getClass()); if (annotationLiteralSubclass == null) { throw new RuntimeException(getClass() + "is not a subclass of AnnotationLiteral"); } annotationType = getTypeParameter(annotationLiteralSubclass); if (annotationType == null) { throw new RuntimeException(getClass() + " does not specify the type parameter T of AnnotationLiteral"); } } return annotationType; } @Override public boolean equals(Object other) { if (other instanceof Annotation) { Annotation that = (Annotation) other; if (this.annotationType().equals(that.annotationType())) { for (Method member : getMembers()) { Object thisValue = invoke(member, this); Object thatValue = invoke(member, that); if (thisValue instanceof byte[] && thatValue instanceof byte[]) { if ( !Arrays.equals((byte[])thisValue, (byte[])thatValue) ) return false; } else if (thisValue instanceof short[] && thatValue instanceof short[]) { if ( !Arrays.equals((short[])thisValue, (short[])thatValue) ) return false; } else if (thisValue instanceof int[] && thatValue instanceof int[]) { if ( !Arrays.equals((int[])thisValue, (int[])thatValue) ) return false; } else if (thisValue instanceof long[] && thatValue instanceof long[]) { if ( !Arrays.equals((long[])thisValue, (long[])thatValue) ) return false; } else if (thisValue instanceof float[] && thatValue instanceof float[]) { if ( !Arrays.equals((float[])thisValue, (float[])thatValue) ) return false; } else if (thisValue instanceof double[] && thatValue instanceof double[]) { if ( !Arrays.equals((double[])thisValue, (double[])thatValue) ) return false; } else if (thisValue instanceof char[] && thatValue instanceof char[]) { if ( !Arrays.equals((char[])thisValue, (char[])thatValue) ) return false; } else if (thisValue instanceof boolean[] && thatValue instanceof boolean[]) { if ( !Arrays.equals((boolean[])thisValue, (boolean[])thatValue) ) return false; } else if (thisValue instanceof Object[] && thatValue instanceof Object[]) { if ( !Arrays.equals((Object[])thisValue, (Object[])thatValue) ) return false; } else { if (!thisValue.equals(thatValue)) return false; } } return true; } } return false; } @Override public int hashCode() { int hashCode = 0; for (Method member: getMembers()) { int memberNameHashCode = 127 * member.getName().hashCode(); Object value = invoke(member, this); int memberValueHashCode; if (value instanceof boolean[]) { memberValueHashCode = Arrays.hashCode((boolean[]) value); } else if (value instanceof short[]) { memberValueHashCode = Arrays.hashCode((short[]) value); } else if (value instanceof int[]) { memberValueHashCode = Arrays.hashCode((int[]) value); } else if (value instanceof long[]) { memberValueHashCode = Arrays.hashCode((long[]) value); } else if (value instanceof float[]) { memberValueHashCode = Arrays.hashCode((float[]) value); } else if (value instanceof double[]) { memberValueHashCode = Arrays.hashCode((double[]) value); } else if (value instanceof byte[]) { memberValueHashCode = Arrays.hashCode((byte[]) value); } else if (value instanceof char[]) { memberValueHashCode = Arrays.hashCode((char[]) value); } else if (value instanceof Object[]) { memberValueHashCode = Arrays.hashCode((Object[]) value); } else { memberValueHashCode = value.hashCode(); } hashCode += memberNameHashCode ^ memberValueHashCode; } return hashCode; } private static void setAccessible(final AccessibleObject ao) { AccessController.doPrivileged(new PrivilegedAction() { @Override public Object run() { ao.setAccessible(true); return null; } }); } private static Object invoke(Method method, Object instance) { try { if (!method.isAccessible()) { setAccessible(method); } return method.invoke(instance); } catch (IllegalArgumentException e) { throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e); } catch (IllegalAccessException e) { throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e); } catch (InvocationTargetException e) { throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e); } } }