api/src/main/java/javax/faces/validator/BeanValidator.java - myfaces - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you 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.faces.validator;

 import org.apache.myfaces.core.api.shared.MessageUtils;
 import org.apache.myfaces.core.api.shared.ExternalSpecifications;
 import java.security.AccessController;
 import java.security.PrivilegedActionException;
 import java.security.PrivilegedExceptionAction;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.logging.Logger;

 import javax.el.ELContext;
 import javax.el.ELResolver;
 import javax.el.FunctionMapper;
 import javax.el.ValueExpression;
 import javax.el.ValueReference;
 import javax.el.VariableMapper;
 import javax.faces.FacesException;
 import javax.faces.application.FacesMessage;
 import javax.faces.component.PartialStateHolder;
 import javax.faces.component.UIComponent;
 import javax.faces.context.FacesContext;
 import javax.faces.el.CompositeComponentExpressionHolder;
 import javax.validation.ConstraintViolation;
 import javax.validation.MessageInterpolator;
 import javax.validation.Validation;
 import javax.validation.ValidatorFactory;
 import javax.validation.groups.Default;
 import javax.validation.metadata.BeanDescriptor;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspProperty;
 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFValidator;
 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;

 /**
  * <p>
  * <strong>BeanValidator</strong> is a {@link javax.faces.validator.Validator}
  * that doesn't do any validation itself, but delegates validation logic to
  * Bean Validation.
  * </p>
  *
  * @since 2.0
  */
 @JSFValidator(
         name="f:validateBean",
         bodyContent="empty")
 @JSFJspProperty(
         name = "binding",
         returnType = "javax.faces.validator.BeanValidator",
         longDesc = "A ValueExpression that evaluates to a BeanValidator.")
 public class BeanValidator implements Validator, PartialStateHolder
 {

     private static final Logger log = Logger.getLogger(BeanValidator.class.getName());

     /**
      * Converter ID, as defined by the JSF 2.0 specification.
      */
     public static final String VALIDATOR_ID = "javax.faces.Bean";

     /**
      * The message ID for this Validator in the message bundles.
      */
     public static final String MESSAGE_ID = "javax.faces.validator.BeanValidator.MESSAGE";

     /**
      * If this init parameter is present, no Bean Validators should be added to an UIInput by default.
      * Explicitly adding a BeanValidator to an UIInput is possible though.
      */
     @JSFWebConfigParam(defaultValue="true", expectedValues="true, false", since="2.0", group="validation")
     public static final String DISABLE_DEFAULT_BEAN_VALIDATOR_PARAM_NAME
             = "javax.faces.validator.DISABLE_DEFAULT_BEAN_VALIDATOR";

     /**
      * The key in the ServletContext where the Bean Validation Factory can be found.
      * In a managed Java EE 6 environment, the container initializes the ValidatorFactory
      * and stores it in the ServletContext under this key.
      * If not present, the manually instantiated ValidatorFactory is stored in the ServletContext
      * under this key for caching purposes.
      */
     public static final String VALIDATOR_FACTORY_KEY = "javax.faces.validator.beanValidator.ValidatorFactory";

     /**
      * This is used as a separator so multiple validation groups can be specified in one String.
      */
     public static final String VALIDATION_GROUPS_DELIMITER = ",";

     /**
      * This regular expression is used to match for empty validation groups.
      * Currently, a string containing only whitespace is classified as empty.
      */
     public static final String EMPTY_VALIDATION_GROUPS_PATTERN = "^[\\W,]*$";

     /**
      * Enable f:validateWholeBean use.
      */
     @JSFWebConfigParam(since="2.3", defaultValue = "false", expectedValues = "true, false", group="validation")
     public static final String ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME =
             "javax.faces.validator.ENABLE_VALIDATE_WHOLE_BEAN";

     private static final Class<?>[] DEFAULT_VALIDATION_GROUPS_ARRAY = new Class<?>[] { Default.class };

     private static final String DEFAULT_VALIDATION_GROUP_NAME = "javax.validation.groups.Default";

     private static final String CANDIDATE_COMPONENT_VALUES_MAP = "oam.WBV.candidatesMap";

     private static final String BEAN_VALIDATION_FAILED = "oam.WBV.validationFailed";

     private String validationGroups;

     private Class<?>[] validationGroupsArray;

     private boolean isTransient = false;

     private boolean _initialStateMarked = false;

     /**
      * {@inheritDoc}
      */
     @Override
     public void validate(final FacesContext context, final UIComponent component, final Object value)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }
         if (component == null)
         {
             throw new NullPointerException("component");
         }

         ValueExpression valueExpression = component.getValueExpression("value");
         if (valueExpression == null)
         {
             log.warning("cannot validate component with empty value: "
                     + component.getClientId(context));
             return;
         }

         // Obtain a reference to the to-be-validated object and the property name.
         ValueReference reference = getValueReference(valueExpression, context);
         if (reference == null)
         {
             return;
         }
         Object base = reference.getBase();
         if (base == null)
         {
             return;
         }

         Class<?> valueBaseClass = base.getClass();
         if (valueBaseClass == null)
         {
             return;
         }

         Object referenceProperty = reference.getProperty();
         if (!(referenceProperty instanceof String))
         {
             // if the property is not a String, the ValueReference does not
             // point to a bean method, but e.g. to a value in a Map, thus we
             // can exit bean validation here
             return;
         }
         String valueProperty = (String) referenceProperty;

         // Initialize Bean Validation.
         ValidatorFactory validatorFactory = createValidatorFactory(context);
         javax.validation.Validator validator = createValidator(validatorFactory, context);
         BeanDescriptor beanDescriptor = validator.getConstraintsForClass(valueBaseClass);
         if (!beanDescriptor.isBeanConstrained())
         {
             return;
         }

         // Note that validationGroupsArray was initialized when createValidator was called
         Class[] validationGroupsArray = this.validationGroupsArray;

         // JSF 2.3: If the ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME application parameter is enabled and this Validator
         // instance has validation groups other than or in addition to the Default group
         boolean containsOtherValidationGroup = false;
         if (validationGroupsArray != null && validationGroupsArray.length > 0)
         {
             for (Class<?> clazz : validationGroupsArray)
             {
                 if (!Default.class.equals(clazz))
                 {
                     containsOtherValidationGroup = true;
                     break;
                 }
             }
         }

         // Delegate to Bean Validation.
         Set constraintViolations = validator.validateValue(valueBaseClass, valueProperty, value, validationGroupsArray);
         if (!constraintViolations.isEmpty())
         {
             Set<FacesMessage> messages = new LinkedHashSet<>(constraintViolations.size());
             for (Object violation : constraintViolations)
             {
                 ConstraintViolation constraintViolation = (ConstraintViolation) violation;
                 String message = constraintViolation.getMessage();
                 Object[] args = new Object[]{ message, MessageUtils.getLabel(context, component) };
                 FacesMessage msg = MessageUtils.getErrorMessage(context, MESSAGE_ID, args);
                 messages.add(msg);
             }

             if (isValidateWholeBeanEnabled(context) && containsOtherValidationGroup)
             {
                 // JSF 2.3: record the fact that this field failed validation so that any <f:validateWholeBean />
                 // component later in the tree is able to skip class-level validation for the bean for which this
                 // particular field is a property. Regardless of whether or not
                 // ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME is set, throw the new exception.
                 context.getViewRoot().getTransientStateHelper().putTransient(BEAN_VALIDATION_FAILED, Boolean.TRUE);
             }

             throw new ValidatorException(messages);
         }
         else
         {

             // JSF 2.3: If the returned Set is empty, the ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME application parameter
             // is enabled and this Validator instance has validation groups other than or in addition to the
             // Default group
             if (isValidateWholeBeanEnabled(context) && containsOtherValidationGroup)
             {
                 // record the fact that this field passed validation so that any <f:validateWholeBean /> component
                 // later in the tree is able to allow class-level validation for the bean for which this particular
                 // field is a property.

                 Map<String, Object> candidatesMap = (Map<String, Object>) context.getViewRoot()
                         .getTransientStateHelper().getTransient(CANDIDATE_COMPONENT_VALUES_MAP);
                 if (candidatesMap == null)
                 {
                     candidatesMap = new LinkedHashMap<>();
                     context.getViewRoot().getTransientStateHelper().putTransient(
                             CANDIDATE_COMPONENT_VALUES_MAP, candidatesMap);
                 }
                 candidatesMap.put(component.getClientId(context), value);
             }
         }
     }

     private boolean isValidateWholeBeanEnabled(FacesContext facesContext)
     {
         Boolean value = (Boolean) facesContext.getAttributes().get(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME);
         if (value == null)
         {
             String enabled = facesContext.getExternalContext().getInitParameter(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME);
             if (enabled == null)
             {
                 value = Boolean.FALSE;
             }
             else
             {
                 value = Boolean.valueOf(enabled);
             }
         }
         return Boolean.TRUE.equals(value);
     }

     private javax.validation.Validator createValidator(final ValidatorFactory validatorFactory, FacesContext context)
     {
         // Set default validation group when setValidationGroups has not been called.
         // The null check is there to prevent it from happening twice.
         if (validationGroupsArray == null)
         {
             postSetValidationGroups();
         }

         return validatorFactory //
                 .usingContext() //
                 .messageInterpolator(new FacesMessageInterpolator(
                         validatorFactory.getMessageInterpolator(), context)) //
                 .getValidator();

     }

     /**
      * Get the ValueReference from the ValueExpression.
      *
      * @param valueExpression The ValueExpression for value.
      * @param context The FacesContext.
      * @return A ValueReferenceWrapper with the necessary information about the ValueReference.
      */
     private ValueReference getValueReference(
             final ValueExpression valueExpression, final FacesContext context)
     {
         ELContext elCtx = context.getELContext();
         return _ValueReferenceResolver.resolve(valueExpression, elCtx);
     }

     /**
      * This method creates ValidatorFactory instances or retrieves them from the container.
      *
      * Once created, ValidatorFactory instances are stored in the container under the key
      * VALIDATOR_FACTORY_KEY for performance.
      *
      * @param context The FacesContext.
      * @return The ValidatorFactory instance.
      * @throws FacesException if no ValidatorFactory can be obtained because: a) the
      * container is not a Servlet container or b) because Bean Validation is not available.
      */
     private ValidatorFactory createValidatorFactory(FacesContext context)
     {
         Map<String, Object> applicationMap = context.getExternalContext().getApplicationMap();
         Object attr = applicationMap.get(VALIDATOR_FACTORY_KEY);
         if (attr instanceof ValidatorFactory)
         {
             return (ValidatorFactory) attr;
         }
         else
         {
             synchronized (this)
             {
                 if (ExternalSpecifications.isBeanValidationAvailable())
                 {
                     ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
                     applicationMap.put(VALIDATOR_FACTORY_KEY, factory);
                     return factory;
                 }
                 else
                 {
                     throw new FacesException("Bean Validation is not present");
                 }
             }
         }
     }

     /**
      * Fully initialize the validation groups if needed.
      * If no validation groups are specified, the Default validation group is used.
      */
     private void postSetValidationGroups()
     {
         if (this.validationGroups == null || this.validationGroups.matches(EMPTY_VALIDATION_GROUPS_PATTERN))
         {
             this.validationGroupsArray = DEFAULT_VALIDATION_GROUPS_ARRAY;
         }
         else
         {
             String[] classes = this.validationGroups.split(VALIDATION_GROUPS_DELIMITER);
             List<Class<?>> validationGroupsList = new ArrayList<>(classes.length);

             for (String clazz : classes)
             {
                 clazz = clazz.trim();
                 if (!clazz.isEmpty())
                 {
                     Class<?> theClass = null;
                     ClassLoader cl = null;
                     if (System.getSecurityManager() != null)
                     {
                         try
                         {
                             cl = (ClassLoader) AccessController.doPrivileged(
                                     (PrivilegedExceptionAction) () -> Thread.currentThread().getContextClassLoader());
                         }
                         catch (PrivilegedActionException pae)
                         {
                             throw new FacesException(pae);
                         }
                     }
                     else
                     {
                         cl = Thread.currentThread().getContextClassLoader();
                     }

                     try
                     {
                         // Try WebApp ClassLoader first
                         theClass = Class.forName(clazz,false,cl);
                     }
                     catch (ClassNotFoundException ignore)
                     {
                         try
                         {
                             // fallback: Try ClassLoader for BeanValidator (i.e. the myfaces.jar lib)
                             theClass = Class.forName(clazz,false, BeanValidator.class.getClassLoader());
                         }
                         catch (ClassNotFoundException e)
                         {
                             throw new RuntimeException("Could not load validation group", e);
                         }
                     }
                     // the class was found
                     validationGroupsList.add(theClass);
                 }
             }

             this.validationGroupsArray = validationGroupsList.toArray(new Class[validationGroupsList.size()]);
         }
     }

     /** {@inheritDoc} */
     @Override
     public Object saveState(final FacesContext context)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }

         if (!initialStateMarked())
         {
            //Full state saving.
            return this.validationGroups;
         }
         else if (DEFAULT_VALIDATION_GROUP_NAME.equals(this.validationGroups))
         {
             // default validation groups can be saved as null.
             return null;
         }
         else
         {
             // Save it fully. Remember that by MYFACES-2528
             // validationGroups needs to be stored into the state
             // because this value is often susceptible to use in "combo"
             return this.validationGroups;
         }
     }

     /** {@inheritDoc} */
     @Override
     public void restoreState(final FacesContext context, final Object state)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }

         if (state != null)
         {
             this.validationGroups = (String) state;
         }
         else
         {
             // When the value is being validated, postSetValidationGroups() sets
             // validationGroups to javax.validation.groups.Default.
             this.validationGroups = null;
         }
         // Only the String is saved, recalculate the Class[] on state restoration.
         //postSetValidationGroups();
     }

     /**
      * Get the Bean Validation validation groups.
      * @return The validation groups String.
      */
     @JSFProperty
     public String getValidationGroups()
     {
         return validationGroups;
     }

     /**
      * Set the Bean Validation validation groups.
      * @param validationGroups The validation groups String, separated by
      *                         {@link BeanValidator#VALIDATION_GROUPS_DELIMITER}.
      */
     public void setValidationGroups(final String validationGroups)
     {
         this.validationGroups = validationGroups;
         this.clearInitialState();
         //postSetValidationGroups();
     }

     @JSFProperty
     @SuppressWarnings("unused")
     private Boolean isDisabled()
     {
         return null;
     }

     @JSFProperty
     @SuppressWarnings("unused")
     private String getFor()
     {
         return null;
     }

     /** {@inheritDoc} */
     @Override
     public boolean isTransient()
     {
         return isTransient;
     }

     /** {@inheritDoc} */
     @Override
     public void setTransient(final boolean isTransient)
     {
         this.isTransient = isTransient;
     }

     /** {@inheritDoc} */
     @Override
     public void clearInitialState()
     {
         _initialStateMarked = false;
     }

     /** {@inheritDoc} */
     @Override
     public boolean initialStateMarked()
     {
         return _initialStateMarked;
     }

     /** {@inheritDoc} */
     @Override
     public void markInitialState()
     {
         _initialStateMarked = true;
     }

     /**
      * Note: Before 2.1.5/2.0.11 there was another strategy for this point to minimize
      * the instances used, but after checking this with a profiler, it is more expensive to
      * call FacesContext.getCurrentInstance() than create this object for bean validation.
      *
      * Standard MessageInterpolator, as described in the JSR-314 spec.
      */
     private static class FacesMessageInterpolator implements MessageInterpolator
     {
         private final FacesContext facesContext;
         private final MessageInterpolator interpolator;

         public FacesMessageInterpolator(final MessageInterpolator interpolator, final FacesContext facesContext)
         {
             this.interpolator = interpolator;
             this.facesContext = facesContext;
         }

         @Override
         public String interpolate(final String s, final Context context)
         {
             Locale locale = facesContext.getViewRoot().getLocale();
             return interpolator.interpolate(s, context, locale);
         }

         @Override
         public String interpolate(final String s, final Context context, final Locale locale)
         {
             return interpolator.interpolate(s, context, locale);
         }
     }
 }

 final class _ValueReferenceResolver
 {
     /**
      * This method can be used to extract the ValueReference from the given ValueExpression.
      *
      * @param valueExpression The ValueExpression to resolve.
      * @param elCtx The ELContext, needed to parse and execute the expression.
      * @return The ValueReferenceWrapper.
      */
     public static ValueReference resolve(ValueExpression valueExpression, final ELContext elCtx)
     {
         ValueReference valueReference = valueExpression.getValueReference(elCtx);

         while (valueReference != null && valueReference.getBase() instanceof CompositeComponentExpressionHolder)
         {
             valueExpression = ((CompositeComponentExpressionHolder) valueReference.getBase())
                                   .getExpression((String) valueReference.getProperty());
             if(valueExpression == null)
             {
                 break;
             }
             valueReference = valueExpression.getValueReference(elCtx);
         }

         return valueReference;
     }
 }

 /**
  * This ELContext is used to hook into the EL handling, by decorating the
  * ELResolver chain with a custom ELResolver.
  */
 final class _ELContextDecorator extends ELContext
 {
     private final ELContext ctx;
     private final ELResolver interceptingResolver;

     /**
      * Only used by ValueExpressionResolver.
      *
      * @param elContext The standard ELContext. All method calls, except getELResolver, are delegated to it.
      * @param interceptingResolver The ELResolver to be returned by getELResolver.
      */
     _ELContextDecorator(final ELContext elContext, final ELResolver interceptingResolver)
     {
         this.ctx = elContext;
         this.interceptingResolver = interceptingResolver;
     }

     /**
      * This is the important one, it returns the passed ELResolver.
      * @return The ELResolver passed into the constructor.
      */
     @Override
     public ELResolver getELResolver()
     {
         return interceptingResolver;
     }

     // ############################ Standard delegating implementations ############################
     @Override
     public FunctionMapper getFunctionMapper()
     {
         return ctx.getFunctionMapper();
     }

     @Override
     public VariableMapper getVariableMapper()
     {
         return ctx.getVariableMapper();
     }

     @Override
     public void setPropertyResolved(final boolean resolved)
     {
         ctx.setPropertyResolved(resolved);
     }

     @Override
     public boolean isPropertyResolved()
     {
         return ctx.isPropertyResolved();
     }

     @Override
     public void putContext(final Class key, Object contextObject)
     {
         ctx.putContext(key, contextObject);
     }

     @Override
     public Object getContext(final Class key)
     {
         return ctx.getContext(key);
     }

     @Override
     public Locale getLocale()
     {
         return ctx.getLocale();
     }

     @Override
     public void setLocale(final Locale locale)
     {
         ctx.setLocale(locale);
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you 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.faces.validator;

	import org.apache.myfaces.core.api.shared.MessageUtils;
	import org.apache.myfaces.core.api.shared.ExternalSpecifications;
	import java.security.AccessController;
	import java.security.PrivilegedActionException;
	import java.security.PrivilegedExceptionAction;
	import java.util.ArrayList;
	import java.util.LinkedHashMap;
	import java.util.LinkedHashSet;
	import java.util.List;
	import java.util.Locale;
	import java.util.Map;
	import java.util.Set;
	import java.util.logging.Logger;

	import javax.el.ELContext;
	import javax.el.ELResolver;
	import javax.el.FunctionMapper;
	import javax.el.ValueExpression;
	import javax.el.ValueReference;
	import javax.el.VariableMapper;
	import javax.faces.FacesException;
	import javax.faces.application.FacesMessage;
	import javax.faces.component.PartialStateHolder;
	import javax.faces.component.UIComponent;
	import javax.faces.context.FacesContext;
	import javax.faces.el.CompositeComponentExpressionHolder;
	import javax.validation.ConstraintViolation;
	import javax.validation.MessageInterpolator;
	import javax.validation.Validation;
	import javax.validation.ValidatorFactory;
	import javax.validation.groups.Default;
	import javax.validation.metadata.BeanDescriptor;

	import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspProperty;
	import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
	import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFValidator;
	import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;

	/**
	* <p>
	* <strong>BeanValidator</strong> is a {@link javax.faces.validator.Validator}
	* that doesn't do any validation itself, but delegates validation logic to
	* Bean Validation.
	* </p>
	*
	* @since 2.0
	*/
	@JSFValidator(
	name="f:validateBean",
	bodyContent="empty")
	@JSFJspProperty(
	name = "binding",
	returnType = "javax.faces.validator.BeanValidator",
	longDesc = "A ValueExpression that evaluates to a BeanValidator.")
	public class BeanValidator implements Validator, PartialStateHolder
	{

	private static final Logger log = Logger.getLogger(BeanValidator.class.getName());

	/**
	* Converter ID, as defined by the JSF 2.0 specification.
	*/
	public static final String VALIDATOR_ID = "javax.faces.Bean";

	/**
	* The message ID for this Validator in the message bundles.
	*/
	public static final String MESSAGE_ID = "javax.faces.validator.BeanValidator.MESSAGE";

	/**
	* If this init parameter is present, no Bean Validators should be added to an UIInput by default.
	* Explicitly adding a BeanValidator to an UIInput is possible though.
	*/
	@JSFWebConfigParam(defaultValue="true", expectedValues="true, false", since="2.0", group="validation")
	public static final String DISABLE_DEFAULT_BEAN_VALIDATOR_PARAM_NAME
	= "javax.faces.validator.DISABLE_DEFAULT_BEAN_VALIDATOR";

	/**
	* The key in the ServletContext where the Bean Validation Factory can be found.
	* In a managed Java EE 6 environment, the container initializes the ValidatorFactory
	* and stores it in the ServletContext under this key.
	* If not present, the manually instantiated ValidatorFactory is stored in the ServletContext
	* under this key for caching purposes.
	*/
	public static final String VALIDATOR_FACTORY_KEY = "javax.faces.validator.beanValidator.ValidatorFactory";

	/**
	* This is used as a separator so multiple validation groups can be specified in one String.
	*/
	public static final String VALIDATION_GROUPS_DELIMITER = ",";

	/**
	* This regular expression is used to match for empty validation groups.
	* Currently, a string containing only whitespace is classified as empty.
	*/
	public static final String EMPTY_VALIDATION_GROUPS_PATTERN = "^[\\W,]*$";

	/**
	* Enable f:validateWholeBean use.
	*/
	@JSFWebConfigParam(since="2.3", defaultValue = "false", expectedValues = "true, false", group="validation")
	public static final String ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME =
	"javax.faces.validator.ENABLE_VALIDATE_WHOLE_BEAN";

	private static final Class<?>[] DEFAULT_VALIDATION_GROUPS_ARRAY = new Class<?>[] { Default.class };

	private static final String DEFAULT_VALIDATION_GROUP_NAME = "javax.validation.groups.Default";

	private static final String CANDIDATE_COMPONENT_VALUES_MAP = "oam.WBV.candidatesMap";

	private static final String BEAN_VALIDATION_FAILED = "oam.WBV.validationFailed";

	private String validationGroups;

	private Class<?>[] validationGroupsArray;

	private boolean isTransient = false;

	private boolean _initialStateMarked = false;

	/**
	* {@inheritDoc}
	*/
	@Override
	public void validate(final FacesContext context, final UIComponent component, final Object value)
	{
	if (context == null)
	{
	throw new NullPointerException("context");
	}
	if (component == null)
	{
	throw new NullPointerException("component");
	}

	ValueExpression valueExpression = component.getValueExpression("value");
	if (valueExpression == null)
	{
	log.warning("cannot validate component with empty value: "
	+ component.getClientId(context));
	return;
	}

	// Obtain a reference to the to-be-validated object and the property name.
	ValueReference reference = getValueReference(valueExpression, context);
	if (reference == null)
	{
	return;
	}
	Object base = reference.getBase();
	if (base == null)
	{
	return;
	}

	Class<?> valueBaseClass = base.getClass();
	if (valueBaseClass == null)
	{
	return;
	}

	Object referenceProperty = reference.getProperty();
	if (!(referenceProperty instanceof String))
	{
	// if the property is not a String, the ValueReference does not
	// point to a bean method, but e.g. to a value in a Map, thus we
	// can exit bean validation here
	return;
	}
	String valueProperty = (String) referenceProperty;

	// Initialize Bean Validation.
	ValidatorFactory validatorFactory = createValidatorFactory(context);
	javax.validation.Validator validator = createValidator(validatorFactory, context);
	BeanDescriptor beanDescriptor = validator.getConstraintsForClass(valueBaseClass);
	if (!beanDescriptor.isBeanConstrained())
	{
	return;
	}

	// Note that validationGroupsArray was initialized when createValidator was called
	Class[] validationGroupsArray = this.validationGroupsArray;

	// JSF 2.3: If the ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME application parameter is enabled and this Validator
	// instance has validation groups other than or in addition to the Default group
	boolean containsOtherValidationGroup = false;
	if (validationGroupsArray != null && validationGroupsArray.length > 0)
	{
	for (Class<?> clazz : validationGroupsArray)
	{
	if (!Default.class.equals(clazz))
	{
	containsOtherValidationGroup = true;
	break;
	}
	}
	}

	// Delegate to Bean Validation.
	Set constraintViolations = validator.validateValue(valueBaseClass, valueProperty, value, validationGroupsArray);
	if (!constraintViolations.isEmpty())
	{
	Set<FacesMessage> messages = new LinkedHashSet<>(constraintViolations.size());
	for (Object violation : constraintViolations)
	{
	ConstraintViolation constraintViolation = (ConstraintViolation) violation;
	String message = constraintViolation.getMessage();
	Object[] args = new Object[]{ message, MessageUtils.getLabel(context, component) };
	FacesMessage msg = MessageUtils.getErrorMessage(context, MESSAGE_ID, args);
	messages.add(msg);
	}

	if (isValidateWholeBeanEnabled(context) && containsOtherValidationGroup)
	{
	// JSF 2.3: record the fact that this field failed validation so that any <f:validateWholeBean />
	// component later in the tree is able to skip class-level validation for the bean for which this
	// particular field is a property. Regardless of whether or not
	// ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME is set, throw the new exception.
	context.getViewRoot().getTransientStateHelper().putTransient(BEAN_VALIDATION_FAILED, Boolean.TRUE);
	}

	throw new ValidatorException(messages);
	}
	else
	{

	// JSF 2.3: If the returned Set is empty, the ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME application parameter
	// is enabled and this Validator instance has validation groups other than or in addition to the
	// Default group
	if (isValidateWholeBeanEnabled(context) && containsOtherValidationGroup)
	{
	// record the fact that this field passed validation so that any <f:validateWholeBean /> component
	// later in the tree is able to allow class-level validation for the bean for which this particular
	// field is a property.

	Map<String, Object> candidatesMap = (Map<String, Object>) context.getViewRoot()
	.getTransientStateHelper().getTransient(CANDIDATE_COMPONENT_VALUES_MAP);
	if (candidatesMap == null)
	{
	candidatesMap = new LinkedHashMap<>();
	context.getViewRoot().getTransientStateHelper().putTransient(
	CANDIDATE_COMPONENT_VALUES_MAP, candidatesMap);
	}
	candidatesMap.put(component.getClientId(context), value);
	}
	}
	}

	private boolean isValidateWholeBeanEnabled(FacesContext facesContext)
	{
	Boolean value = (Boolean) facesContext.getAttributes().get(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME);
	if (value == null)
	{
	String enabled = facesContext.getExternalContext().getInitParameter(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME);
	if (enabled == null)
	{
	value = Boolean.FALSE;
	}
	else
	{
	value = Boolean.valueOf(enabled);
	}
	}
	return Boolean.TRUE.equals(value);
	}

	private javax.validation.Validator createValidator(final ValidatorFactory validatorFactory, FacesContext context)
	{
	// Set default validation group when setValidationGroups has not been called.
	// The null check is there to prevent it from happening twice.
	if (validationGroupsArray == null)
	{
	postSetValidationGroups();
	}

	return validatorFactory //
	.usingContext() //
	.messageInterpolator(new FacesMessageInterpolator(
	validatorFactory.getMessageInterpolator(), context)) //
	.getValidator();

	}

	/**
	* Get the ValueReference from the ValueExpression.
	*
	* @param valueExpression The ValueExpression for value.
	* @param context The FacesContext.
	* @return A ValueReferenceWrapper with the necessary information about the ValueReference.
	*/
	private ValueReference getValueReference(
	final ValueExpression valueExpression, final FacesContext context)
	{
	ELContext elCtx = context.getELContext();
	return _ValueReferenceResolver.resolve(valueExpression, elCtx);
	}

	/**
	* This method creates ValidatorFactory instances or retrieves them from the container.
	*
	* Once created, ValidatorFactory instances are stored in the container under the key
	* VALIDATOR_FACTORY_KEY for performance.
	*
	* @param context The FacesContext.
	* @return The ValidatorFactory instance.
	* @throws FacesException if no ValidatorFactory can be obtained because: a) the
	* container is not a Servlet container or b) because Bean Validation is not available.
	*/
	private ValidatorFactory createValidatorFactory(FacesContext context)
	{
	Map<String, Object> applicationMap = context.getExternalContext().getApplicationMap();
	Object attr = applicationMap.get(VALIDATOR_FACTORY_KEY);
	if (attr instanceof ValidatorFactory)
	{
	return (ValidatorFactory) attr;
	}
	else
	{
	synchronized (this)
	{
	if (ExternalSpecifications.isBeanValidationAvailable())
	{
	ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
	applicationMap.put(VALIDATOR_FACTORY_KEY, factory);
	return factory;
	}
	else
	{
	throw new FacesException("Bean Validation is not present");
	}
	}
	}
	}

	/**
	* Fully initialize the validation groups if needed.
	* If no validation groups are specified, the Default validation group is used.
	*/
	private void postSetValidationGroups()
	{
	if (this.validationGroups == null \|\| this.validationGroups.matches(EMPTY_VALIDATION_GROUPS_PATTERN))
	{
	this.validationGroupsArray = DEFAULT_VALIDATION_GROUPS_ARRAY;
	}
	else
	{
	String[] classes = this.validationGroups.split(VALIDATION_GROUPS_DELIMITER);
	List<Class<?>> validationGroupsList = new ArrayList<>(classes.length);

	for (String clazz : classes)
	{
	clazz = clazz.trim();
	if (!clazz.isEmpty())
	{
	Class<?> theClass = null;
	ClassLoader cl = null;
	if (System.getSecurityManager() != null)
	{
	try
	{
	cl = (ClassLoader) AccessController.doPrivileged(
	(PrivilegedExceptionAction) () -> Thread.currentThread().getContextClassLoader());
	}
	catch (PrivilegedActionException pae)
	{
	throw new FacesException(pae);
	}
	}
	else
	{
	cl = Thread.currentThread().getContextClassLoader();
	}

	try
	{
	// Try WebApp ClassLoader first
	theClass = Class.forName(clazz,false,cl);
	}
	catch (ClassNotFoundException ignore)
	{
	try
	{
	// fallback: Try ClassLoader for BeanValidator (i.e. the myfaces.jar lib)
	theClass = Class.forName(clazz,false, BeanValidator.class.getClassLoader());
	}
	catch (ClassNotFoundException e)
	{
	throw new RuntimeException("Could not load validation group", e);
	}
	}
	// the class was found
	validationGroupsList.add(theClass);
	}
	}

	this.validationGroupsArray = validationGroupsList.toArray(new Class[validationGroupsList.size()]);
	}
	}

	/** {@inheritDoc} */
	@Override
	public Object saveState(final FacesContext context)
	{
	if (context == null)
	{
	throw new NullPointerException("context");
	}

	if (!initialStateMarked())
	{
	//Full state saving.
	return this.validationGroups;
	}
	else if (DEFAULT_VALIDATION_GROUP_NAME.equals(this.validationGroups))
	{
	// default validation groups can be saved as null.
	return null;
	}
	else
	{
	// Save it fully. Remember that by MYFACES-2528
	// validationGroups needs to be stored into the state
	// because this value is often susceptible to use in "combo"
	return this.validationGroups;
	}
	}

	/** {@inheritDoc} */
	@Override
	public void restoreState(final FacesContext context, final Object state)
	{
	if (context == null)
	{
	throw new NullPointerException("context");
	}

	if (state != null)
	{
	this.validationGroups = (String) state;
	}
	else
	{
	// When the value is being validated, postSetValidationGroups() sets
	// validationGroups to javax.validation.groups.Default.
	this.validationGroups = null;
	}
	// Only the String is saved, recalculate the Class[] on state restoration.
	//postSetValidationGroups();
	}

	/**
	* Get the Bean Validation validation groups.
	* @return The validation groups String.
	*/
	@JSFProperty
	public String getValidationGroups()
	{
	return validationGroups;
	}

	/**
	* Set the Bean Validation validation groups.
	* @param validationGroups The validation groups String, separated by
	* {@link BeanValidator#VALIDATION_GROUPS_DELIMITER}.
	*/
	public void setValidationGroups(final String validationGroups)
	{
	this.validationGroups = validationGroups;
	this.clearInitialState();
	//postSetValidationGroups();
	}

	@JSFProperty
	@SuppressWarnings("unused")
	private Boolean isDisabled()
	{
	return null;
	}

	@JSFProperty
	@SuppressWarnings("unused")
	private String getFor()
	{
	return null;
	}

	/** {@inheritDoc} */
	@Override
	public boolean isTransient()
	{
	return isTransient;
	}

	/** {@inheritDoc} */
	@Override
	public void setTransient(final boolean isTransient)
	{
	this.isTransient = isTransient;
	}

	/** {@inheritDoc} */
	@Override
	public void clearInitialState()
	{
	_initialStateMarked = false;
	}

	/** {@inheritDoc} */
	@Override
	public boolean initialStateMarked()
	{
	return _initialStateMarked;
	}

	/** {@inheritDoc} */
	@Override
	public void markInitialState()
	{
	_initialStateMarked = true;
	}

	/**
	* Note: Before 2.1.5/2.0.11 there was another strategy for this point to minimize
	* the instances used, but after checking this with a profiler, it is more expensive to
	* call FacesContext.getCurrentInstance() than create this object for bean validation.
	*
	* Standard MessageInterpolator, as described in the JSR-314 spec.
	*/
	private static class FacesMessageInterpolator implements MessageInterpolator
	{
	private final FacesContext facesContext;
	private final MessageInterpolator interpolator;

	public FacesMessageInterpolator(final MessageInterpolator interpolator, final FacesContext facesContext)
	{
	this.interpolator = interpolator;
	this.facesContext = facesContext;
	}

	@Override
	public String interpolate(final String s, final Context context)
	{
	Locale locale = facesContext.getViewRoot().getLocale();
	return interpolator.interpolate(s, context, locale);
	}

	@Override
	public String interpolate(final String s, final Context context, final Locale locale)
	{
	return interpolator.interpolate(s, context, locale);
	}
	}
	}

	final class _ValueReferenceResolver
	{
	/**
	* This method can be used to extract the ValueReference from the given ValueExpression.
	*
	* @param valueExpression The ValueExpression to resolve.
	* @param elCtx The ELContext, needed to parse and execute the expression.
	* @return The ValueReferenceWrapper.
	*/
	public static ValueReference resolve(ValueExpression valueExpression, final ELContext elCtx)
	{
	ValueReference valueReference = valueExpression.getValueReference(elCtx);

	while (valueReference != null && valueReference.getBase() instanceof CompositeComponentExpressionHolder)
	{
	valueExpression = ((CompositeComponentExpressionHolder) valueReference.getBase())
	.getExpression((String) valueReference.getProperty());
	if(valueExpression == null)
	{
	break;
	}
	valueReference = valueExpression.getValueReference(elCtx);
	}

	return valueReference;
	}
	}

	/**
	* This ELContext is used to hook into the EL handling, by decorating the
	* ELResolver chain with a custom ELResolver.
	*/
	final class _ELContextDecorator extends ELContext
	{
	private final ELContext ctx;
	private final ELResolver interceptingResolver;

	/**
	* Only used by ValueExpressionResolver.
	*
	* @param elContext The standard ELContext. All method calls, except getELResolver, are delegated to it.
	* @param interceptingResolver The ELResolver to be returned by getELResolver.
	*/
	_ELContextDecorator(final ELContext elContext, final ELResolver interceptingResolver)
	{
	this.ctx = elContext;
	this.interceptingResolver = interceptingResolver;
	}

	/**
	* This is the important one, it returns the passed ELResolver.
	* @return The ELResolver passed into the constructor.
	*/
	@Override
	public ELResolver getELResolver()
	{
	return interceptingResolver;
	}

	// ############################ Standard delegating implementations ############################
	@Override
	public FunctionMapper getFunctionMapper()
	{
	return ctx.getFunctionMapper();
	}

	@Override
	public VariableMapper getVariableMapper()
	{
	return ctx.getVariableMapper();
	}

	@Override
	public void setPropertyResolved(final boolean resolved)
	{
	ctx.setPropertyResolved(resolved);
	}

	@Override
	public boolean isPropertyResolved()
	{
	return ctx.isPropertyResolved();
	}

	@Override
	public void putContext(final Class key, Object contextObject)
	{
	ctx.putContext(key, contextObject);
	}

	@Override
	public Object getContext(final Class key)
	{
	return ctx.getContext(key);
	}

	@Override
	public Locale getLocale()
	{
	return ctx.getLocale();
	}

	@Override
	public void setLocale(final Locale locale)
	{
	ctx.setLocale(locale);
	}
	}