67 lines
2.7 KiB
Java
67 lines
2.7 KiB
Java
/* Copyright 2010 Abhinav Sarkar <abhinav@abhinavsarkar.net>
|
|
*
|
|
* This file is a part of SpelHelper library.
|
|
*
|
|
* SpelHelper library is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License (GNU LGPL) as
|
|
* published by the Free Software Foundation, either version 3 of the License,
|
|
* or (at your option) any later version.
|
|
*
|
|
* SpelHelper library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with SpelHelper library. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
package net.abhinavsarkar.spelhelper;
|
|
|
|
import java.text.MessageFormat;
|
|
import java.util.concurrent.ConcurrentHashMap;
|
|
|
|
import org.springframework.expression.AccessException;
|
|
import org.springframework.expression.EvaluationContext;
|
|
import org.springframework.expression.MethodExecutor;
|
|
import org.springframework.expression.MethodResolver;
|
|
import org.springframework.expression.TypedValue;
|
|
import org.springframework.util.Assert;
|
|
|
|
final class ImplicitPropertyAccessor extends ReadOnlyGenericPropertyAccessor {
|
|
|
|
private static final ConcurrentHashMap<String, MethodExecutor> cache =
|
|
new ConcurrentHashMap<String, MethodExecutor>();
|
|
|
|
public boolean canRead(final EvaluationContext context,
|
|
final Object target, final String name)
|
|
throws AccessException {
|
|
Assert.notNull(target, "target is null");
|
|
String cacheKey = target.getClass().getName() + "." + name;
|
|
if (cache.containsKey(cacheKey)) {
|
|
return cache.get(cacheKey) != null;
|
|
}
|
|
|
|
for (MethodResolver mr : context.getMethodResolvers()) {
|
|
MethodExecutor me = mr.resolve(context, target, name, new Class[0]);
|
|
if (me != null) {
|
|
cache.putIfAbsent(cacheKey, me);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
cache.putIfAbsent(cacheKey, null);
|
|
return false;
|
|
}
|
|
|
|
public TypedValue read(final EvaluationContext context,
|
|
final Object target, final String name)
|
|
throws AccessException {
|
|
if (canRead(context, target, name)) {
|
|
String cacheKey = target.getClass().getName() + "." + name;
|
|
return cache.get(cacheKey).execute(context, target, new Object[0]);
|
|
}
|
|
throw new AccessException(MessageFormat.format(
|
|
"Cannot read property: {0} of target: {1}", name, target));
|
|
}
|
|
|
|
} |