Author: epbernard Date: 2009-08-05 14:49:13 -0400 (Wed, 05 Aug 2009) New Revision: 17235 Added: validator/trunk/hibernate-validator/src/main/java/org/hibernate/validation/util/LazyValidatorFactory.java Log: HV-197 implement a lazy validator factory Added: validator/trunk/hibernate-validator/src/main/java/org/hibernate/validation/util/LazyValidatorFactory.java =================================================================== --- validator/trunk/hibernate-validator/src/main/java/org/hibernate/validation/util/LazyValidatorFactory.java (rev 0) +++ validator/trunk/hibernate-validator/src/main/java/org/hibernate/validation/util/LazyValidatorFactory.java 2009-08-05 18:49:13 UTC (rev 17235) @@ -0,0 +1,73 @@ +package org.hibernate.validation.util; + +import javax.validation.ValidatorFactory; +import javax.validation.Validator; +import javax.validation.ValidatorContext; +import javax.validation.MessageInterpolator; +import javax.validation.Configuration; +import javax.validation.Validation; + +/** + * This class lazily initialize the ValidatorFactory on the first usage + * One benefit is that no domain class is loaded until the + * ValidatorFactory is really needed. + * Useful to avoid loading classes before JPA is initialized + * and has enhanced its classes. + * + * Experimental, not considered a public API + * @author Emmanuel Bernard + */ +public class LazyValidatorFactory implements ValidatorFactory { + + private final Configuration<?> configuration; + private volatile ValidatorFactory delegate; //use as a barrier + + /** + * Use the default ValidatorFactory creation routine + */ + public LazyValidatorFactory() { + this(null); + } + + public LazyValidatorFactory(Configuration<?> configuration) { + this.configuration = configuration; + } + + public Validator getValidator() { + if ( delegate == null ) { + initFactory(); + } + return delegate.getValidator(); + } + + //we can initialize several times that's ok + private void initFactory() { + if ( configuration == null ) { + delegate = Validation.buildDefaultValidatorFactory(); + } + else { + delegate = configuration.buildValidatorFactory(); + } + } + + public ValidatorContext usingContext() { + if ( delegate == null ) { + initFactory(); + } + return delegate.usingContext(); + } + + public MessageInterpolator getMessageInterpolator() { + if ( delegate == null ) { + initFactory(); + } + return delegate.getMessageInterpolator(); + } + + public <T> T unwrap(Class<T> clazz) { + if ( delegate == null ) { + initFactory(); + } + return delegate.unwrap( clazz ); + } +}