org.thymeleaf.spring4.expression.BeansPropertyAccessor Maven / Gradle / Ivy
/*
* =============================================================================
*
* Copyright (c) 2011-2013, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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.thymeleaf.spring4.expression;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.support.ReflectivePropertyAccessor;
import org.thymeleaf.spring4.context.Beans;
/**
*
* @author Daniel Fernández
*
* @since 1.1
*
*/
class BeansPropertyAccessor extends ReflectivePropertyAccessor {
private static final Class[] TARGET_CLASSES = new Class[] { Beans.class };
public static final BeansPropertyAccessor INSTANCE = new BeansPropertyAccessor();
BeansPropertyAccessor() {
super();
}
@Override
public Class[] getSpecificTargetClasses() {
return TARGET_CLASSES;
}
@Override
public boolean canRead(final EvaluationContext context, final Object target, final String name)
throws AccessException {
if (target == null) {
return false;
}
if (!(target instanceof Beans)) {
// This can happen simply because we're applying the same
// AST tree on a different class (Spring internally caches property accessors).
// So this exception might be considered "normal" by Spring AST evaluator and
// just use it to refresh the property accessor cache.
throw new AccessException("Cannot read target of class " + target.getClass().getName());
}
return ((Beans)target).containsKey(name);
}
@Override
public TypedValue read(final EvaluationContext context, final Object target, final String name)
throws AccessException {
if (target == null) {
throw new AccessException("Cannot read property of null target");
}
if (!(target instanceof Beans)) {
// This can happen simply because we're applying the same
// AST tree on a different class (Spring internally caches property accessors).
// So this exception might be considered "normal" by Spring AST evaluator and
// just use it to refresh the property accessor cache.
throw new AccessException("Cannot read target of class " + target.getClass().getName());
}
return new TypedValue(((Beans)target).get(name));
}
}