package org.hibernate.validator.internal.engine.messageinterpolation;
import java.lang.invoke.MethodHandles;
import java.util.Locale;
import java.util.Map;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.PropertyNotFoundException;
import javax.el.ValueExpression;
import javax.validation.MessageInterpolator;
import org.hibernate.validator.internal.engine.messageinterpolation.el.RootResolver;
import org.hibernate.validator.internal.engine.messageinterpolation.el.SimpleELContext;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
import org.hibernate.validator.messageinterpolation.HibernateMessageInterpolatorContext;
public class ElTermResolver implements TermResolver {
private static final Log LOG = LoggerFactory.make( MethodHandles.lookup() );
private static final String VALIDATED_VALUE_NAME = "validatedValue";
private final Locale locale;
private final ExpressionFactory expressionFactory;
public ElTermResolver(Locale locale, ExpressionFactory expressionFactory) {
this.locale = locale;
this.expressionFactory = expressionFactory;
}
@Override
public String interpolate(MessageInterpolator.Context context, String expression) {
String resolvedExpression = expression;
SimpleELContext elContext = new SimpleELContext( expressionFactory );
try {
ValueExpression valueExpression = bindContextValues( expression, context, elContext );
resolvedExpression = (String) valueExpression.getValue( elContext );
}
catch (PropertyNotFoundException pnfe) {
LOG.unknownPropertyInExpressionLanguage( expression, pnfe );
}
catch (ELException e) {
LOG.errorInExpressionLanguage( expression, e );
}
catch (Exception e) {
LOG.evaluatingExpressionLanguageExpressionCausedException( expression, e );
}
return resolvedExpression;
}
private ValueExpression bindContextValues(String messageTemplate, MessageInterpolator.Context messageInterpolatorContext, SimpleELContext elContext) {
ValueExpression valueExpression = expressionFactory.createValueExpression(
messageInterpolatorContext.getValidatedValue(),
Object.class
);
elContext.getVariableMapper().setVariable( VALIDATED_VALUE_NAME, valueExpression );
valueExpression = expressionFactory.createValueExpression(
new FormatterWrapper( locale ),
FormatterWrapper.class
);
elContext.getVariableMapper().setVariable( RootResolver.FORMATTER, valueExpression );
addVariablesToElContext( elContext, messageInterpolatorContext.getConstraintDescriptor().getAttributes() );
if ( messageInterpolatorContext instanceof HibernateMessageInterpolatorContext ) {
addVariablesToElContext( elContext, ( (HibernateMessageInterpolatorContext) messageInterpolatorContext ).getExpressionVariables() );
}
return expressionFactory.createValueExpression( elContext, messageTemplate, String.class );
}
private void addVariablesToElContext(SimpleELContext elContext, Map<String, Object> variables) {
for ( Map.Entry<String, Object> entry : variables.entrySet() ) {
ValueExpression valueExpression = expressionFactory.createValueExpression( entry.getValue(), Object.class );
elContext.getVariableMapper().setVariable( entry.getKey(), valueExpression );
}
}
}