/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.core.enums;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Set;
import java.util.TreeSet;
import org.springframework.util.Assert;
/**
* {@link LabeledEnumResolver} that resolves statically defined enumerations.
* Static implies all enum instances were defined within Java code,
* implementing the type-safe enum pattern.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 1.2.2
* @deprecated as of Spring 3.0, in favor of Java 5 enums.
*/
@Deprecated
public class StaticLabeledEnumResolver extends AbstractCachingLabeledEnumResolver {
/**
* Shared <code>StaticLabeledEnumResolver</code> singleton instance.
*/
private static final StaticLabeledEnumResolver INSTANCE = new StaticLabeledEnumResolver();
/**
* Return the shared <code>StaticLabeledEnumResolver</code> singleton instance.
* Mainly for resolving unique StaticLabeledEnum references on deserialization.
* @see StaticLabeledEnum
*/
public static StaticLabeledEnumResolver instance() {
return INSTANCE;
}
@Override
protected Set<LabeledEnum> findLabeledEnums(Class type) {
Set<LabeledEnum> typeEnums = new TreeSet<LabeledEnum>();
for (Field field : type.getFields()) {
if (Modifier.isStatic(field.getModifiers()) && Modifier.isPublic(field.getModifiers())) {
if (type.isAssignableFrom(field.getType())) {
try {
Object value = field.get(null);
Assert.isTrue(value instanceof LabeledEnum, "Field value must be a LabeledEnum instance");
typeEnums.add((LabeledEnum) value);
}
catch (IllegalAccessException ex) {
logger.warn("Unable to access field value: " + field, ex);
}
}
}
}
return typeEnums;
}
}
|