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  /*
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   * JBoss, Home of Professional Open Source
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   * Copyright 2010, Red Hat, Inc., and individual contributors
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   * by the @authors tag. See the copyright.txt in the distribution for a
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   * full listing of individual contributors.
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   *
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   * Licensed under the Apache License, Version 2.0 (the "License");
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   * you may not use this file except in compliance with the License.
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   * You may obtain a copy of the License at
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  * http://www.apache.org/licenses/LICENSE-2.0
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  * Unless required by applicable law or agreed to in writing, software
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  * distributed under the License is distributed on an "AS IS" BASIS,  
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  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  * See the License for the specific language governing permissions and
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  * limitations under the License.
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  */
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 package javax.enterprise.util;
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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 {
 }
 
 PayBy paybyCheque = new PayByQualifier() {
     public PaymentMethod value() {
         return CHEQUE;
     }
 };

Parameters:
<T> the annotation type
Author(s):
Pete Muir
Gavin King
See also:
javax.enterprise.inject.Instance.select(java.lang.annotation.Annotation[])
javax.enterprise.event.Event.select(java.lang.annotation.Annotation[])
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 public abstract class AnnotationLiteral<T extends Annotation> implements Annotation, Serializable {
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     private static final long serialVersionUID = 1L;
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     private transient Class<T> annotationType;
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     private transient Method[] members;
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     protected AnnotationLiteral() {
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     }
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     private Method[] getMembers() {
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         if ( == null) {
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              = annotationType().getDeclaredMethods();
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             if (. > 0 && !annotationType().isAssignableFrom(this.getClass())) {
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                 throw new RuntimeException(getClass() + " does not implement the annotation type with members "
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                         + annotationType().getName());
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             }
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         }
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         return ;
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     }
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     private static Class<?> getAnnotationLiteralSubclass(Class<?> clazz) {
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         Class<?> superclass = clazz.getSuperclass();
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         if (superclass.equals(AnnotationLiteral.class)) {
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             return clazz;
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         } else if (superclass.equals(Object.class)) {
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             return null;
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         } else {
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             return (getAnnotationLiteralSubclass(superclass));
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         }
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     }
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     @SuppressWarnings("unchecked")
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     private static <T> Class<T> getTypeParameter(Class<?> annotationLiteralSuperclass) {
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         Type type = annotationLiteralSuperclass.getGenericSuperclass();
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         if (type instanceof ParameterizedType) {
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             ParameterizedType parameterizedType = (ParameterizedType) type;
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             if (parameterizedType.getActualTypeArguments().length == 1) {
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                 return (Class<T>) parameterizedType.getActualTypeArguments()[0];
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             }
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         }
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        return null;
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    }
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    public Class<? extends Annotation> annotationType() {
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        if ( == null) {
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            Class<?> annotationLiteralSubclass = getAnnotationLiteralSubclass(this.getClass());
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            if (annotationLiteralSubclass == null) {
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                throw new RuntimeException(getClass() + "is not a subclass of AnnotationLiteral");
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            }
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             = getTypeParameter(annotationLiteralSubclass);
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            if ( == null) {
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                throw new RuntimeException(getClass() + " does not specify the type parameter T of AnnotationLiteral<T>");
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            }
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        }
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        return ;
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    }
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    @Override
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    public String toString() {
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        StringBuilder string = new StringBuilder();
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        string.append('@').append(annotationType().getName()).append('(');
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        for (int i = 0; i < getMembers().length; i++) {
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            string.append(getMembers()[i].getName()).append('=');
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            Object value = invoke(getMembers()[i], this);
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            assertMemberValueNotNull(getMembers()[i], this, value);
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            if (value instanceof boolean[]) {
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                appendInBraces(string, Arrays.toString((boolean[]) value));
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            } else if (value instanceof byte[]) {
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                appendInBraces(string, Arrays.toString((byte[]) value));
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            } else if (value instanceof short[]) {
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                appendInBraces(string, Arrays.toString((short[]) value));
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            } else if (value instanceof int[]) {
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                appendInBraces(string, Arrays.toString((int[]) value));
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            } else if (value instanceof long[]) {
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                appendInBraces(string, Arrays.toString((long[]) value));
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            } else if (value instanceof float[]) {
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                appendInBraces(string, Arrays.toString((float[]) value));
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            } else if (value instanceof double[]) {
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                appendInBraces(string, Arrays.toString((double[]) value));
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            } else if (value instanceof char[]) {
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                appendInBraces(string, Arrays.toString((char[]) value));
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            } else if (value instanceof String[]) {
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                String[] strings = (String[]) value;
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                String[] quoted = new String[strings.length];
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                for (int j = 0; j < strings.length; j++) {
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                    quoted[j] = "\"" + strings[j] + "\"";
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                }
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                appendInBraces(string, Arrays.toString(quoted));
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            } else if (value instanceof Class<?>[]) {
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                Class<?>[] classes = (Class<?>[]) value;
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                String[] names = new String[classes.length];
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                for (int j = 0; j < classes.length; j++) {
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                    names[j] = classes[j].getName() + ".class";
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                }
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                appendInBraces(string, Arrays.toString(names));
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            } else if (value instanceof Object[]) {
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                appendInBraces(string, Arrays.toString((Object[]) value));
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            } else if (value instanceof String) {
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                string.append('"').append(value).append('"');
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            } else if (value instanceof Class<?>) {
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                string.append(((Class<?>) value).getName()).append(".class");
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            } else {
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                string.append(value);
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            }
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            if (i < getMembers().length - 1) {
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                string.append(", ");
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            }
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        }
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        return string.append(')').toString();
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    }
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    private void appendInBraces(StringBuilder buf, String s) {
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        buf.append('{').append(s.substring(1, s.length() - 1)).append('}');
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    }
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    @Override
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    public boolean equals(Object other) {
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        if (other instanceof Annotation) {
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            Annotation that = (Annotation) other;
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            if (this.annotationType().equals(that.annotationType())) {
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                for (Method member : getMembers()) {
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                    Object thisValue = invoke(member, this);
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                    assertMemberValueNotNull(member, this, thisValue);
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                    Object thatValue = invoke(member, that);
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                    assertMemberValueNotNull(member, this, thatValue);
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                    if (thisValue instanceof byte[] && thatValue instanceof byte[]) {
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                        if (!Arrays.equals((byte[]) thisValue, (byte[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof short[] && thatValue instanceof short[]) {
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                        if (!Arrays.equals((short[]) thisValue, (short[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof int[] && thatValue instanceof int[]) {
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                        if (!Arrays.equals((int[]) thisValue, (int[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof long[] && thatValue instanceof long[]) {
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                        if (!Arrays.equals((long[]) thisValue, (long[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof float[] && thatValue instanceof float[]) {
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                        if (!Arrays.equals((float[]) thisValue, (float[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof double[] && thatValue instanceof double[]) {
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                        if (!Arrays.equals((double[]) thisValue, (double[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof char[] && thatValue instanceof char[]) {
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                        if (!Arrays.equals((char[]) thisValue, (char[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof boolean[] && thatValue instanceof boolean[]) {
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                        if (!Arrays.equals((boolean[]) thisValue, (boolean[]) thatValue))
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                            return false;
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                    } else if (thisValue instanceof Object[] && thatValue instanceof Object[]) {
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                        if (!Arrays.equals((Object[]) thisValue, (Object[]) thatValue))
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                            return false;
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                    } else {
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                        if (!thisValue.equals(thatValue))
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                            return false;
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                    }
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                }
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                return true;
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            }
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        }
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        return false;
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    }
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    @Override
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    public int hashCode() {
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        int hashCode = 0;
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        for (Method member : getMembers()) {
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            int memberNameHashCode = 127 * member.getName().hashCode();
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            Object value = invoke(member, this);
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            assertMemberValueNotNull(member, this, value);
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            int memberValueHashCode;
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            if (value instanceof boolean[]) {
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                memberValueHashCode = Arrays.hashCode((boolean[]) value);
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            } else if (value instanceof short[]) {
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                memberValueHashCode = Arrays.hashCode((short[]) value);
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            } else if (value instanceof int[]) {
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                memberValueHashCode = Arrays.hashCode((int[]) value);
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            } else if (value instanceof long[]) {
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                memberValueHashCode = Arrays.hashCode((long[]) value);
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            } else if (value instanceof float[]) {
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                memberValueHashCode = Arrays.hashCode((float[]) value);
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            } else if (value instanceof double[]) {
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                memberValueHashCode = Arrays.hashCode((double[]) value);
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            } else if (value instanceof byte[]) {
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                memberValueHashCode = Arrays.hashCode((byte[]) value);
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            } else if (value instanceof char[]) {
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                memberValueHashCode = Arrays.hashCode((char[]) value);
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            } else if (value instanceof Object[]) {
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                memberValueHashCode = Arrays.hashCode((Object[]) value);
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            } else {
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                memberValueHashCode = value.hashCode();
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            }
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            hashCode += memberNameHashCode ^ memberValueHashCode;
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        }
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        return hashCode;
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    }
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    private static Object invoke(Method method, Object instance) {
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        try {
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            if (!method.isAccessible())
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                method.setAccessible(true);
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            return method.invoke(instance);
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        } catch (IllegalArgumentException e) {
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            throw new RuntimeException("Error checking value of member method " + method.getName() + " on "
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                    + method.getDeclaringClass(), e);
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        } catch (IllegalAccessException e) {
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            throw new RuntimeException("Error checking value of member method " + method.getName() + " on "
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                    + method.getDeclaringClass(), e);
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        } catch (InvocationTargetException e) {
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            throw new RuntimeException("Error checking value of member method " + method.getName() + " on "
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                    + method.getDeclaringClass(), e);
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        }
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    }
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    private static void assertMemberValueNotNull(Method member, Annotation instance, Object value) {
275
        if (value == null) {
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            throw new IllegalArgumentException("Annotation member " + instance.getClass().getName() + "." + member.getName()
277
                    + " must not be null");
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        }
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    }
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