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/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat, Inc. and/or its affiliates, 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.validator.internal.engine.resolver;
import java.lang.annotation.ElementType;
import java.util.HashMap;
import java.util.Map;
import javax.validation.Path;
import javax.validation.TraversableResolver;
/**
* Cache results of a delegated traversable resolver to optimize calls.
* It works only for a single validate* call and should not be used if
* the TraversableResolver is accessed concurrently.
*
* @author Emmanuel Bernard
*/
public class SingleThreadCachedTraversableResolver implements TraversableResolver {
private TraversableResolver delegate;
private Map traversables = new HashMap();
public SingleThreadCachedTraversableResolver(TraversableResolver delegate) {
this.delegate = delegate;
}
public boolean isReachable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject, ElementType elementType) {
TraversableHolder currentLH = new TraversableHolder(
traversableObject, traversableProperty, rootBeanType, pathToTraversableObject, elementType
);
TraversableHolder cachedLH = traversables.get( currentLH );
if ( cachedLH == null ) {
currentLH.isReachable = delegate.isReachable(
traversableObject,
traversableProperty,
rootBeanType,
pathToTraversableObject,
elementType
);
traversables.put( currentLH, currentLH );
cachedLH = currentLH;
}
else if ( cachedLH.isReachable == null ) {
cachedLH.isReachable = delegate.isReachable(
traversableObject,
traversableProperty,
rootBeanType,
pathToTraversableObject,
elementType
);
}
return cachedLH.isReachable;
}
public boolean isCascadable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject, ElementType elementType) {
TraversableHolder currentLH = new TraversableHolder(
traversableObject, traversableProperty, rootBeanType, pathToTraversableObject, elementType
);
TraversableHolder cachedLH = traversables.get( currentLH );
if ( cachedLH == null ) {
currentLH.isCascadable = delegate.isCascadable(
traversableObject,
traversableProperty,
rootBeanType,
pathToTraversableObject,
elementType
);
traversables.put( currentLH, currentLH );
cachedLH = currentLH;
}
else if ( cachedLH.isCascadable == null ) {
cachedLH.isCascadable = delegate.isCascadable(
traversableObject,
traversableProperty,
rootBeanType,
pathToTraversableObject,
elementType
);
}
return cachedLH.isCascadable;
}
private static final class TraversableHolder {
private final Object traversableObject;
private final Path.Node traversableProperty;
private final Class rootBeanType;
private final Path pathToTraversableObject;
private final ElementType elementType;
private final int hashCode;
private Boolean isReachable;
private Boolean isCascadable;
private TraversableHolder(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject, ElementType elementType) {
this.traversableObject = traversableObject;
this.traversableProperty = traversableProperty;
this.rootBeanType = rootBeanType;
this.pathToTraversableObject = pathToTraversableObject;
this.elementType = elementType;
this.hashCode = buildHashCode();
}
@Override
public boolean equals(Object o) {
if ( this == o ) {
return true;
}
if ( o == null || getClass() != o.getClass() ) {
return false;
}
TraversableHolder that = ( TraversableHolder ) o;
if ( elementType != that.elementType ) {
return false;
}
if ( !pathToTraversableObject.equals( that.pathToTraversableObject ) ) {
return false;
}
if ( !rootBeanType.equals( that.rootBeanType ) ) {
return false;
}
if ( traversableObject != null ? !traversableObject.equals( that.traversableObject ) : that.traversableObject != null ) {
return false;
}
if ( !traversableProperty.equals( that.traversableProperty ) ) {
return false;
}
return true;
}
@Override
public int hashCode() {
return hashCode;
}
public int buildHashCode() {
int result = traversableObject != null ? traversableObject.hashCode() : 0;
result = 31 * result + traversableProperty.hashCode();
result = 31 * result + rootBeanType.hashCode();
result = 31 * result + pathToTraversableObject.hashCode();
result = 31 * result + elementType.hashCode();
return result;
}
}
}