/*
* Copyright 2002-2008 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.beans.factory.config;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.TypeConverter;
import org.springframework.core.GenericCollectionTypeResolver;
/**
* Simple factory for shared Set instances. Allows for central setup
* of Sets via the "set" element in XML bean definitions.
*
* @author Juergen Hoeller
* @since 09.12.2003
* @see ListFactoryBean
* @see MapFactoryBean
*/
public class SetFactoryBean extends AbstractFactoryBean<Set> {
private Set sourceSet;
private Class targetSetClass;
/**
* Set the source Set, typically populated via XML "set" elements.
*/
public void setSourceSet(Set sourceSet) {
this.sourceSet = sourceSet;
}
/**
* Set the class to use for the target Set. Can be populated with a fully
* qualified class name when defined in a Spring application context.
* <p>Default is a linked HashSet, keeping the registration order.
* @see java.util.LinkedHashSet
*/
public void setTargetSetClass(Class targetSetClass) {
if (targetSetClass == null) {
throw new IllegalArgumentException("'targetSetClass' must not be null");
}
if (!Set.class.isAssignableFrom(targetSetClass)) {
throw new IllegalArgumentException("'targetSetClass' must implement [java.util.Set]");
}
this.targetSetClass = targetSetClass;
}
@Override
public Class<Set> getObjectType() {
return Set.class;
}
@Override
@SuppressWarnings("unchecked")
protected Set createInstance() {
if (this.sourceSet == null) {
throw new IllegalArgumentException("'sourceSet' is required");
}
Set result = null;
if (this.targetSetClass != null) {
result = (Set) BeanUtils.instantiateClass(this.targetSetClass);
}
else {
result = new LinkedHashSet(this.sourceSet.size());
}
Class valueType = null;
if (this.targetSetClass != null) {
valueType = GenericCollectionTypeResolver.getCollectionType(this.targetSetClass);
}
if (valueType != null) {
TypeConverter converter = getBeanTypeConverter();
for (Object elem : this.sourceSet) {
result.add(converter.convertIfNecessary(elem, valueType));
}
}
else {
result.addAll(this.sourceSet);
}
return result;
}
}
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