[hibernate-commits] Hibernate SVN: r17235 - validator/trunk/hibernate-validator/src/main/java/org/hibernate/validation/util.

[hibernate-commits at lists.jboss.org]

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 );
+	}
+}