// $Id: ConstraintHelper.java 16313 2009-04-14 13:51:42Z hardy.ferentschik $
/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, 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.validation.engine;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ValidationException;
import javax.validation.constraints.AssertFalse;
import javax.validation.constraints.AssertTrue;
import javax.validation.constraints.Digits;
import javax.validation.constraints.Future;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Null;
import javax.validation.constraints.Past;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
import org.slf4j.Logger;
import org.hibernate.validation.constraints.AssertFalseValidator;
import org.hibernate.validation.constraints.AssertTrueValidator;
import org.hibernate.validation.constraints.DigitsValidatorForNumber;
import org.hibernate.validation.constraints.DigitsValidatorForString;
import org.hibernate.validation.constraints.FutureValidatorForCalendar;
import org.hibernate.validation.constraints.FutureValidatorForDate;
import org.hibernate.validation.constraints.MaxValidatorForNumber;
import org.hibernate.validation.constraints.MaxValidatorForString;
import org.hibernate.validation.constraints.MinValidatorForNumber;
import org.hibernate.validation.constraints.MinValidatorForString;
import org.hibernate.validation.constraints.NotNullValidator;
import org.hibernate.validation.constraints.NullValidator;
import org.hibernate.validation.constraints.PastValidatorForCalendar;
import org.hibernate.validation.constraints.PastValidatorForDate;
import org.hibernate.validation.constraints.PatternValidator;
import org.hibernate.validation.constraints.SizeValidatorForArray;
import org.hibernate.validation.constraints.SizeValidatorForCollection;
import org.hibernate.validation.constraints.SizeValidatorForMap;
import org.hibernate.validation.constraints.SizeValidatorForString;
import org.hibernate.validation.util.LoggerFactory;
import org.hibernate.validation.util.ReflectionHelper;
/**
* Keeps track of builtin constraints and their validator implementations, as well as already resolved validator definitions.
*
* @author Hardy Ferentschik
* @author Alaa Nassef
*/
public class ConstraintHelper {
private static final Logger log = LoggerFactory.make();
private final Map<Class<? extends Annotation>, List<Class<? extends ConstraintValidator<?, ?>>>> builtinConstraints =
new HashMap<Class<? extends Annotation>, List<Class<? extends ConstraintValidator<?, ?>>>>();
private final Map<Class<? extends Annotation>, List<Class<? extends ConstraintValidator<? extends Annotation, ?>>>> constraintValidatorDefinitons =
new HashMap<Class<? extends Annotation>, List<Class<? extends ConstraintValidator<? extends Annotation, ?>>>>();
public ConstraintHelper() {
List<Class<? extends ConstraintValidator<?, ?>>> constraintList =
new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( AssertFalseValidator.class );
builtinConstraints.put( AssertFalse.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( AssertTrueValidator.class );
builtinConstraints.put( AssertTrue.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( FutureValidatorForCalendar.class );
constraintList.add( FutureValidatorForDate.class );
builtinConstraints.put( Future.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( MaxValidatorForNumber.class );
constraintList.add( MaxValidatorForString.class );
builtinConstraints.put( Max.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( MinValidatorForNumber.class );
constraintList.add( MinValidatorForString.class );
builtinConstraints.put( Min.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( NotNullValidator.class );
builtinConstraints.put( NotNull.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( NullValidator.class );
builtinConstraints.put( Null.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( PastValidatorForCalendar.class );
constraintList.add( PastValidatorForDate.class );
builtinConstraints.put( Past.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( DigitsValidatorForString.class );
constraintList.add( DigitsValidatorForNumber.class );
builtinConstraints.put( Digits.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( SizeValidatorForString.class );
constraintList.add( SizeValidatorForCollection.class );
constraintList.add( SizeValidatorForArray.class );
constraintList.add( SizeValidatorForMap.class );
builtinConstraints.put( Size.class, constraintList );
constraintList = new ArrayList<Class<? extends ConstraintValidator<?, ?>>>();
constraintList.add( PatternValidator.class );
builtinConstraints.put( Pattern.class, constraintList );
}
public List<Class<? extends ConstraintValidator<? extends Annotation, ?>>> getBuiltInConstraints(Class<? extends Annotation> annotationType) {
final List<Class<? extends ConstraintValidator<?, ?>>> builtInList = getBuiltInFromAnnotationType(
annotationType
);
if ( builtInList == null || builtInList.size() == 0 ) {
throw new ValidationException( "Unable to find constraints for " + annotationType );
}
List<Class<? extends ConstraintValidator<? extends Annotation, ?>>> constraints =
new ArrayList<Class<? extends ConstraintValidator<? extends Annotation, ?>>>( builtInList.size() );
for ( Class<? extends ConstraintValidator<?, ?>> validatorClass : builtInList ) {
//safe cause all CV for a given annotation A are CV<A, ?>
@SuppressWarnings("unchecked")
Class<ConstraintValidator<? extends Annotation, ?>> safeValdiatorClass = ( Class<ConstraintValidator<? extends Annotation, ?>> ) validatorClass;
constraints.add( safeValdiatorClass );
}
return constraints;
}
private List<Class<? extends ConstraintValidator<?, ?>>> getBuiltInFromAnnotationType(Class<? extends Annotation> annotationType) {
return builtinConstraints.get( annotationType );
}
public boolean isBuiltinConstraint(Class<? extends Annotation> annotationType) {
return builtinConstraints.containsKey( annotationType );
}
/**
* Checks whether a given annotation is a multi value constraint or not.
*
* @param annotation the annotation to check.
*
* @return <code>true</code> if the specified annotation is a multi value constraints, <code>false</code>
* otherwise.
*/
public boolean isMultiValueConstraint(Annotation annotation) {
boolean isMultiValueConstraint = false;
try {
Method m = annotation.getClass().getMethod( "value" );
Class returnType = m.getReturnType();
if ( returnType.isArray() && returnType.getComponentType().isAnnotation() ) {
Annotation[] annotations = ( Annotation[] ) m.invoke( annotation );
for ( Annotation a : annotations ) {
if ( isConstraintAnnotation( a ) || isBuiltinConstraint( a.annotationType() ) ) {
isMultiValueConstraint = true;
}
else {
isMultiValueConstraint = false;
break;
}
}
}
}
catch ( NoSuchMethodException nsme ) {
// ignore
}
catch ( IllegalAccessException iae ) {
// ignore
}
catch ( InvocationTargetException ite ) {
// ignore
}
return isMultiValueConstraint;
}
/**
* Checks whether a given annotation is a multi value constraint and returns the contained constraints if so.
*
* @param annotation the annotation to check.
*
* @return A list of constraint annotations or the empty list if <code>annotation</code> is not a multi constraint
* annotation.
*/
public <A extends Annotation> List<Annotation> getMultiValueConstraints(A annotation) {
List<Annotation> annotationList = new ArrayList<Annotation>();
try {
Method m = annotation.getClass().getMethod( "value" );
Class returnType = m.getReturnType();
if ( returnType.isArray() && returnType.getComponentType().isAnnotation() ) {
Annotation[] annotations = ( Annotation[] ) m.invoke( annotation );
for ( Annotation a : annotations ) {
if ( isConstraintAnnotation( a ) || isBuiltinConstraint( a.annotationType() ) ) {
annotationList.add( a );
}
}
}
}
catch ( NoSuchMethodException nsme ) {
// ignore
}
catch ( IllegalAccessException iae ) {
// ignore
}
catch ( InvocationTargetException ite ) {
// ignore
}
return annotationList;
}
/**
* Checks whether the specified annotation is a valid constraint annotation. A constraint annotations has to
* fulfill the following conditions:
* <ul>
* <li>Has to contain a <code>ConstraintValidator</code> implementation.</li>
* <li>Defines a message parameter.</li>
* <li>Defines a group parameter.</li>
* </ul>
*
* @param annotation The annotation to test.
*
* @return <code>true</code> if the annotation fulfills the above condtions, <code>false</code> otherwise.
*/
public boolean isConstraintAnnotation(Annotation annotation) {
Constraint constraint = annotation.annotationType()
.getAnnotation( Constraint.class );
if ( constraint == null ) {
return false;
}
try {
ReflectionHelper.getAnnotationParameter( annotation, "message", String.class );
}
catch ( Exception e ) {
String msg = annotation.annotationType().getName() + " contains Constraint annotation, but does " +
"not contain a message parameter. Annotation is getting ignored.";
log.warn( msg );
return false;
}
try {
ReflectionHelper.getAnnotationParameter( annotation, "groups", Class[].class );
}
catch ( Exception e ) {
String msg = annotation.annotationType().getName() + " contains Constraint annotation, but does " +
"not contain a groups parameter. Annotation is getting ignored.";
log.warn( msg );
return false;
}
Method[] methods = annotation.getClass().getMethods();
for ( Method m : methods ) {
if ( m.getName().startsWith( "valid" ) ) {
String msg = "Parameters starting with 'valid' are not allowed in a constraint.";
log.warn( msg );
return false;
}
}
return true;
}
public List<Class<? extends ConstraintValidator<? extends Annotation, ?>>> getConstraintValidatorDefinition(Class<? extends Annotation> annotationClass) {
if ( annotationClass == null ) {
throw new IllegalArgumentException( "Class cannot be null" );
}
return constraintValidatorDefinitons.get( annotationClass );
}
public <A extends Annotation> void addConstraintValidatorDefinition(Class<A> annotationClass, List<Class<? extends ConstraintValidator<? extends Annotation, ?>>> definitionClasses) {
constraintValidatorDefinitons.put( annotationClass, definitionClasses );
}
public boolean containsConstraintValidatorDefinition(Class<? extends Annotation> annotationClass) {
return constraintValidatorDefinitons.containsKey( annotationClass );
}
}