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org.hibernate.validation.engine.ResourceBundleMessageInterpolator Maven / Gradle / Ivy
Module repackaging of the Hibernate validator library and Validation API (JSR 303)
// $Id: ResourceBundleMessageInterpolator.java 17265 2009-08-11 19:31:41Z epbernard $
/*
* 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.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.security.AccessController;
import javax.validation.MessageInterpolator;
import org.slf4j.Logger;
import org.hibernate.validation.util.LoggerFactory;
import org.hibernate.validation.util.GetClassLoader;
/**
* Resource bundle backed message interpolator.
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
*/
public class ResourceBundleMessageInterpolator implements MessageInterpolator {
private static final String DEFAULT_VALIDATION_MESSAGES = "org.hibernate.validation.ValidationMessages";
private static final String USER_VALIDATION_MESSAGES = "ValidationMessages";
private static final Logger log = LoggerFactory.make();
/**
* Regular expression used to do message interpolation.
*/
private static final Pattern messageParameterPattern = Pattern.compile( "(\\{[^\\}]+?\\})" );
/**
* The default locale for the current user.
*/
private final Locale defaultLocale;
/**
* User specified resource bundles hashed against their locale.
*/
private final Map userBundlesMap = new ConcurrentHashMap();
/**
* Builtin resource bundles hashed against there locale.
*/
private final Map defaultBundlesMap = new ConcurrentHashMap();
public ResourceBundleMessageInterpolator() {
this( null );
}
public ResourceBundleMessageInterpolator(ResourceBundle resourceBundle) {
defaultLocale = Locale.getDefault();
if ( resourceBundle == null ) {
ResourceBundle bundle = getFileBasedResourceBundle( defaultLocale );
if ( bundle != null ) {
userBundlesMap.put( defaultLocale, bundle );
}
}
else {
userBundlesMap.put( defaultLocale, resourceBundle );
}
defaultBundlesMap.put( defaultLocale, ResourceBundle.getBundle( DEFAULT_VALIDATION_MESSAGES, defaultLocale ) );
}
public String interpolate(String message, Context context) {
// probably no need for caching, but it could be done by parameters since the map
// is immutable and uniquely built per Validation definition, the comparaison has to be based on == and not equals though
return interpolateMessage( message, context.getConstraintDescriptor().getAttributes(), defaultLocale );
}
public String interpolate(String message, Context context, Locale locale) {
return interpolateMessage( message, context.getConstraintDescriptor().getAttributes(), locale );
}
/**
* Runs the message interpolation according to alogrithm specified in JSR 303.
* Locale to use for the resource bundle.
*
* @return the interpolated message.
*/
private String interpolateMessage(String message, Map annotationParameters, Locale locale) {
ResourceBundle userResourceBundle = findUserResourceBundle( locale );
ResourceBundle defaultResourceBundle = findDefaultResourceBundle( locale );
String userBundleResolvedMessage;
String resolvedMessage = message;
boolean evaluatedDefaultBundleOnce = false;
do {
// search the user bundle recursive (step1)
userBundleResolvedMessage = replaceVariables(
resolvedMessage, userResourceBundle, locale, true
);
// exit condition - we have at least tried to vaidate against the default bundle and there was no
// further replacements
if ( evaluatedDefaultBundleOnce
&& !hasReplacementTakenPlace( userBundleResolvedMessage, resolvedMessage ) ) {
break;
}
// search the default bundle non recursive (step2)
resolvedMessage = replaceVariables( userBundleResolvedMessage, defaultResourceBundle, locale, false );
evaluatedDefaultBundleOnce = true;
} while ( true );
// resolve annotation attributes (step 4)
resolvedMessage = replaceAnnotationAttributes( resolvedMessage, annotationParameters );
// last but not least we have to take care of escaped literals
resolvedMessage = resolvedMessage.replace( "\\{", "{" );
resolvedMessage = resolvedMessage.replace( "\\}", "}" );
resolvedMessage = resolvedMessage.replace( "\\\\", "\\" );
return resolvedMessage;
}
private boolean hasReplacementTakenPlace(String origMessage, String newMessage) {
return !origMessage.equals( newMessage );
}
/**
* Search current thread classloader for the resource bundle. If not found, search validator (this) classloader.
*
* @param locale The locale of the bundle to load.
*
* @return the resource bundle or null if none is found.
*/
private ResourceBundle getFileBasedResourceBundle(Locale locale) {
ResourceBundle rb = null;
boolean isSecured = System.getSecurityManager() != null;
GetClassLoader action = GetClassLoader.fromContext();
ClassLoader classLoader = isSecured ? AccessController.doPrivileged( action ) : action.run();
if ( classLoader != null ) {
rb = loadBundle( classLoader, locale, USER_VALIDATION_MESSAGES + " not found by thread local classloader" );
}
if ( rb == null ) {
action = GetClassLoader.fromClass(ResourceBundleMessageInterpolator.class);
classLoader = isSecured ? AccessController.doPrivileged( action ) : action.run();
rb = loadBundle(
classLoader,
locale,
USER_VALIDATION_MESSAGES + " not found by validator classloader"
);
}
if ( log.isDebugEnabled() ) {
if ( rb != null ) {
log.debug( USER_VALIDATION_MESSAGES + " found" );
}
else {
log.debug( USER_VALIDATION_MESSAGES + " not found. Delegating to " + DEFAULT_VALIDATION_MESSAGES );
}
}
return rb;
}
private ResourceBundle loadBundle(ClassLoader classLoader, Locale locale, String message) {
ResourceBundle rb = null;
try {
rb = ResourceBundle.getBundle( USER_VALIDATION_MESSAGES, locale, classLoader );
}
catch ( MissingResourceException e ) {
log.trace( message );
}
return rb;
}
private String replaceVariables(String message, ResourceBundle bundle, Locale locale, boolean recurse) {
Matcher matcher = messageParameterPattern.matcher( message );
StringBuffer sb = new StringBuffer();
String resolvedParameterValue;
while ( matcher.find() ) {
String parameter = matcher.group( 1 );
resolvedParameterValue = resolveParameter(
parameter, bundle, locale, recurse
);
matcher.appendReplacement( sb, escapeMetaCharacters( resolvedParameterValue ) );
}
matcher.appendTail( sb );
return sb.toString();
}
private String replaceAnnotationAttributes(String message, Map annotationParameters) {
Matcher matcher = messageParameterPattern.matcher( message );
StringBuffer sb = new StringBuffer();
while ( matcher.find() ) {
String resolvedParameterValue;
String parameter = matcher.group( 1 );
Object variable = annotationParameters.get( removeCurlyBrace( parameter ) );
if ( variable != null ) {
resolvedParameterValue = escapeMetaCharacters( variable.toString() );
}
else {
resolvedParameterValue = parameter;
}
matcher.appendReplacement( sb, resolvedParameterValue );
}
matcher.appendTail( sb );
return sb.toString();
}
private String resolveParameter(String parameterName, ResourceBundle bundle, Locale locale, boolean recurse) {
String parameterValue;
try {
if ( bundle != null ) {
parameterValue = bundle.getString( removeCurlyBrace( parameterName ) );
if ( recurse ) {
parameterValue = replaceVariables( parameterValue, bundle, locale, recurse );
}
}
else {
parameterValue = parameterName;
}
}
catch ( MissingResourceException e ) {
// return parameter itself
parameterValue = parameterName;
}
return parameterValue;
}
private String removeCurlyBrace(String parameter) {
return parameter.substring( 1, parameter.length() - 1 );
}
private ResourceBundle findDefaultResourceBundle(Locale locale) {
if ( defaultBundlesMap.containsKey( locale ) ) {
return defaultBundlesMap.get( locale );
}
ResourceBundle bundle = ResourceBundle.getBundle( DEFAULT_VALIDATION_MESSAGES, locale );
defaultBundlesMap.put( locale, bundle );
return bundle;
}
private ResourceBundle findUserResourceBundle(Locale locale) {
if ( userBundlesMap.containsKey( locale ) ) {
return userBundlesMap.get( locale );
}
ResourceBundle bundle = getFileBasedResourceBundle( locale );
if ( bundle != null ) {
userBundlesMap.put( locale, bundle );
}
return bundle;
}
/**
* @param s The string in which to replace the meta characters '$' and '\'.
*
* @return A string where meta characters relevant for {@link Matcher#appendReplacement} are escaped.
*/
private String escapeMetaCharacters(String s) {
String escapedString = s.replace( "\\", "\\\\" );
escapedString = escapedString.replace( "$", "\\$" );
return escapedString;
}
}
