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/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc. and/or its affiliates, 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 org.hibernate.validator.internal.util.annotationfactory;
import static org.hibernate.validator.internal.util.CollectionHelper.newHashMap;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import org.hibernate.validator.internal.util.ReflectionHelper;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
/**
* A concrete implementation of Annotation that pretends it is a
* "real" source code annotation. It's also an InvocationHandler.
*
* When you create an AnnotationProxy, you must initialize it
* with an AnnotationDescriptor.
* The adapter checks that the provided elements are the same elements defined
* in the annotation interface. However, it does not check that their
* values are the right type. If you omit an element, the adapter will use the
* default value for that element from the annotation interface, if it exists.
* If no default exists, it will throw an exception.
*
*
* @author Paolo Perrotta
* @author Davide Marchignoli
* @author Gunnar Morling
*
* @see java.lang.annotation.Annotation
*/
public class AnnotationProxy implements Annotation, InvocationHandler, Serializable {
private static final long serialVersionUID = 6907601010599429454L;
private static final Log log = LoggerFactory.make();
private final Class annotationType;
private final Map values;
private final int hashCode;
public AnnotationProxy(AnnotationDescriptor descriptor) {
this.annotationType = descriptor.type();
values = Collections.unmodifiableMap( getAnnotationValues( descriptor ) );
this.hashCode = calculateHashCode();
}
private Map getAnnotationValues(AnnotationDescriptor descriptor) {
Map result = newHashMap();
int processedValuesFromDescriptor = 0;
final Method[] declaredMethods = ReflectionHelper.getDeclaredMethods( annotationType );
for ( Method m : declaredMethods ) {
if ( descriptor.containsElement( m.getName() ) ) {
result.put( m.getName(), descriptor.valueOf( m.getName() ) );
processedValuesFromDescriptor++;
}
else if ( m.getDefaultValue() != null ) {
result.put( m.getName(), m.getDefaultValue() );
}
else {
throw log.getNoValueProvidedForAnnotationParameterException(
m.getName(),
annotationType.getSimpleName()
);
}
}
if ( processedValuesFromDescriptor != descriptor.numberOfElements() ) {
Set unknownParameters = descriptor.getElements().keySet();
unknownParameters.removeAll( result.keySet() );
throw log.getTryingToInstantiateAnnotationWithUnknownParametersException(
annotationType,
unknownParameters
);
}
return result;
}
private Object getAnnotationMemberValue(Annotation annotation, String name) {
try {
return ReflectionHelper.getDeclaredMethod( annotation.annotationType(), name )
.invoke( annotation );
}
catch ( IllegalAccessException e ) {
throw log.getUnableToRetrieveAnnotationParameterValueException( e );
}
catch ( IllegalArgumentException e ) {
throw log.getUnableToRetrieveAnnotationParameterValueException( e );
}
catch ( InvocationTargetException e ) {
throw log.getUnableToRetrieveAnnotationParameterValueException( e );
}
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if ( values.containsKey( method.getName() ) ) {
return values.get( method.getName() );
}
return method.invoke( this, args );
}
@Override
public Class annotationType() {
return annotationType;
}
/**
* Performs an equality check as described in {@link Annotation#equals(Object)}.
*
* @param obj The object to compare
*
* @return Whether the given object is equal to this annotation proxy or not
*
* @see Annotation#equals(Object)
*/
@Override
public boolean equals(Object obj) {
if ( this == obj ) {
return true;
}
if ( obj == null ) {
return false;
}
if ( !annotationType.isInstance( obj ) ) {
return false;
}
Annotation other = annotationType.cast( obj );
//compare annotation member values
for ( Entry member : values.entrySet() ) {
Object value = member.getValue();
Object otherValue = getAnnotationMemberValue( other, member.getKey() );
if ( !areEqual( value, otherValue ) ) {
return false;
}
}
return true;
}
/**
* Calculates the hash code of this annotation proxy as described in
* {@link Annotation#hashCode()}.
*
* @return The hash code of this proxy.
*
* @see Annotation#hashCode()
*/
@Override
public int hashCode() {
return hashCode;
}
private int calculateHashCode() {
int hashCode = 0;
for ( Entry member : values.entrySet() ) {
Object value = member.getValue();
int nameHashCode = member.getKey().hashCode();
int valueHashCode =
!value.getClass().isArray() ? value.hashCode() :
value.getClass() == boolean[].class ? Arrays.hashCode( (boolean[]) value ) :
value.getClass() == byte[].class ? Arrays.hashCode( (byte[]) value ) :
value.getClass() == char[].class ? Arrays.hashCode( (char[]) value ) :
value.getClass() == double[].class ? Arrays.hashCode( (double[]) value ) :
value.getClass() == float[].class ? Arrays.hashCode( (float[]) value ) :
value.getClass() == int[].class ? Arrays.hashCode( (int[]) value ) :
value.getClass() == long[].class ? Arrays.hashCode( (long[]) value ) :
value.getClass() == short[].class ? Arrays.hashCode( (short[]) value ) :
Arrays.hashCode( (Object[]) value );
hashCode += 127 * nameHashCode ^ valueHashCode;
}
return hashCode;
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
result.append( '@' ).append( annotationType.getName() ).append( '(' );
for ( String s : getRegisteredMethodsInAlphabeticalOrder() ) {
result.append( s ).append( '=' ).append( values.get( s ) ).append( ", " );
}
// remove last separator:
if ( values.size() > 0 ) {
result.delete( result.length() - 2, result.length() );
result.append( ")" );
}
else {
result.delete( result.length() - 1, result.length() );
}
return result.toString();
}
private SortedSet getRegisteredMethodsInAlphabeticalOrder() {
SortedSet result = new TreeSet();
result.addAll( values.keySet() );
return result;
}
private boolean areEqual(Object o1, Object o2) {
return
!o1.getClass().isArray() ? o1.equals( o2 ) :
o1.getClass() == boolean[].class ? Arrays.equals( (boolean[]) o1, (boolean[]) o2 ) :
o1.getClass() == byte[].class ? Arrays.equals( (byte[]) o1, (byte[]) o2 ) :
o1.getClass() == char[].class ? Arrays.equals( (char[]) o1, (char[]) o2 ) :
o1.getClass() == double[].class ? Arrays.equals( (double[]) o1, (double[]) o2 ) :
o1.getClass() == float[].class ? Arrays.equals( (float[]) o1, (float[]) o2 ) :
o1.getClass() == int[].class ? Arrays.equals( (int[]) o1, (int[]) o2 ) :
o1.getClass() == long[].class ? Arrays.equals( (long[]) o1, (long[]) o2 ) :
o1.getClass() == short[].class ? Arrays.equals( (short[]) o1, (short[]) o2 ) :
Arrays.equals( (Object[]) o1, (Object[]) o2 );
}
}