org.hibernate.validator.internal.engine.resolver.CachingJPATraversableResolverForSingleValidation Maven / Gradle / Ivy
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/*
* Hibernate Validator, declare and validate application constraints
*
* License: Apache License, Version 2.0
* See the license.txt file in the root directory or .
*/
package org.hibernate.validator.internal.engine.resolver;
import java.lang.annotation.ElementType;
import java.util.HashMap;
import javax.validation.Path;
import javax.validation.TraversableResolver;
/**
* Cache results of a delegated {@link JPATraversableResolver} to optimize calls.
*
* It should only be used to wrap a {@code JPATraversableResolver} as it relies on the contract defined in the Bean
* Validation specification.
*
* It works only for a single validate* call and should not be used if {@code TraversableResolver} is accessed
* concurrently.
*
* @author Guillaume Smet
*/
class CachingJPATraversableResolverForSingleValidation implements TraversableResolver {
private final TraversableResolver delegate;
private final HashMap traversables = new HashMap();
public CachingJPATraversableResolverForSingleValidation(TraversableResolver delegate) {
this.delegate = delegate;
}
@Override
public boolean isReachable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject,
ElementType elementType) {
if ( traversableObject == null ) {
return true;
}
return traversables.computeIfAbsent( new TraversableHolder( traversableObject, traversableProperty ), th -> delegate.isReachable(
traversableObject,
traversableProperty,
rootBeanType,
pathToTraversableObject,
elementType ) );
}
@Override
public boolean isCascadable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject,
ElementType elementType) {
// JPATraversableResolver returns true for isCascadable() per spec so we can avoid the overhead of caching.
return true;
}
private static class TraversableHolder extends AbstractTraversableHolder {
private TraversableHolder(Object traversableObject, Path.Node traversableProperty) {
super( traversableObject, traversableProperty );
}
}
}