Start line:  
End line:  

Snippet Preview

Snippet HTML Code

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

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;
     }
 };
 

 
 public abstract class AnnotationLiteral<T extends Annotationimplements AnnotationSerializable {
 
     private static final long serialVersionUID = 1L;
 
     private transient Class<T> annotationType;
     private transient Method[] members;
     private transient Integer cachedHashCode;
 
     protected AnnotationLiteral() {
         if (getMembers().length == 0) {
             this. = 0;
         } else {
             this. = null;
         }
     }
 
     private Method[] getMembers() {
         if ( == null) {
              = annotationType().getDeclaredMethods();
             if (. > 0 && !annotationType().isAssignableFrom(this.getClass())) {
                 throw new RuntimeException(getClass() + " does not implement the annotation type with members "
                         + annotationType().getName());
             }
         }
         return ;
     }
 
     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 <T> Class<T> getTypeParameter(Class<?> annotationLiteralSuperclass) {
        Type type = annotationLiteralSuperclass.getGenericSuperclass();
        if (type instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedTypetype;
            if (parameterizedType.getActualTypeArguments().length == 1) {
                return (Class<T>) parameterizedType.getActualTypeArguments()[0];
            }
        }
        return null;
    }
    public Class<? extends AnnotationannotationType() {
        if ( == null) {
            Class<?> annotationLiteralSubclass = getAnnotationLiteralSubclass(this.getClass());
            if (annotationLiteralSubclass == null) {
                throw new RuntimeException(getClass() + " is not a subclass of AnnotationLiteral");
            }
             = getTypeParameter(annotationLiteralSubclass);
            if ( == null) {
                throw new RuntimeException(getClass() + " does not specify the type parameter T of AnnotationLiteral<T>");
            }
        }
        return ;
    }
    @Override
    public String toString() {
        StringBuilder string = new StringBuilder();
        string.append('@').append(annotationType().getName()).append('(');
        for (int i = 0; i < getMembers().lengthi++) {
            string.append(getMembers()[i].getName()).append('=');
            Object value = getMemberValue(getMembers()[i], this);
            if (value instanceof boolean[]) {
                appendInBraces(string, Arrays.toString((boolean[]) value));
            } else if (value instanceof byte[]) {
                appendInBraces(string, Arrays.toString((byte[]) value));
            } else if (value instanceof short[]) {
                appendInBraces(string, Arrays.toString((short[]) value));
            } else if (value instanceof int[]) {
                appendInBraces(string, Arrays.toString((int[]) value));
            } else if (value instanceof long[]) {
                appendInBraces(string, Arrays.toString((long[]) value));
            } else if (value instanceof float[]) {
                appendInBraces(string, Arrays.toString((float[]) value));
            } else if (value instanceof double[]) {
                appendInBraces(string, Arrays.toString((double[]) value));
            } else if (value instanceof char[]) {
                appendInBraces(string, Arrays.toString((char[]) value));
            } else if (value instanceof String[]) {
                String[] strings = (String[]) value;
                String[] quoted = new String[strings.length];
                for (int j = 0; j < strings.lengthj++) {
                    quoted[j] = "\"" + strings[j] + "\"";
                }
                appendInBraces(string, Arrays.toString(quoted));
            } else if (value instanceof Class<?>[]) {
                Class<?>[] classes = (Class<?>[]) value;
                String[] names = new String[classes.length];
                for (int j = 0; j < classes.lengthj++) {
                    names[j] = classes[j].getName() + ".class";
                }
                appendInBraces(string, Arrays.toString(names));
            } else if (value instanceof Object[]) {
                appendInBraces(string, Arrays.toString((Object[]) value));
            } else if (value instanceof String) {
                string.append('"').append(value).append('"');
            } else if (value instanceof Class<?>) {
                string.append(((Class<?>) value).getName()).append(".class");
            } else {
                string.append(value);
            }
            if (i < getMembers().length - 1) {
                string.append(", ");
            }
        }
        return string.append(')').toString();
    }
    private void appendInBraces(StringBuilder bufString s) {
        buf.append('{').append(s.substring(1, s.length() - 1)).append('}');
    }
    @Override
    public boolean equals(Object other) {
        if (other == this) {
            return true;
        }
        if (other == null) {
            return false;
        }
        if (other instanceof Annotation) {
            Annotation that = (Annotationother;
            if (this.annotationType().equals(that.annotationType())) {
                for (Method member : getMembers()) {
                    Object thisValue = getMemberValue(memberthis);
                    Object thatValue = getMemberValue(memberthat);
                    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() {
        if ( != null) {
            return ;
        } else {
            int hashCode = 0;
            for (Method member : getMembers()) {
                int memberNameHashCode = 127 * member.getName().hashCode();
                Object value = getMemberValue(memberthis);
                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 Object getMemberValue(Method memberAnnotation instance) {
        Object value = invoke(memberinstance);
        if (value == null) {
            throw new IllegalArgumentException("Annotation member value " + instance.getClass().getName() + "."
                    + member.getName() + " must not be null");
        }
        return value;
    }
    private static Object invoke(Method methodObject instance) {
        try {
            if (!method.isAccessible())
                method.setAccessible(true);
            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);
        }
    }
New to GrepCode? Check out our FAQ X