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.ResolvableType;
import org.springframework.lang.Nullable;
public class SetFactoryBean extends AbstractFactoryBean<Set<Object>> {
@Nullable
private Set<?> sourceSet;
@SuppressWarnings("rawtypes")
@Nullable
private Class<? extends Set> targetSetClass;
public void setSourceSet(Set<?> sourceSet) {
this.sourceSet = sourceSet;
}
@SuppressWarnings("rawtypes")
public void setTargetSetClass(@Nullable Class<? extends Set> 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
@SuppressWarnings("rawtypes")
public Class<Set> getObjectType() {
return Set.class;
}
@Override
@SuppressWarnings("unchecked")
protected Set<Object> createInstance() {
if (this.sourceSet == null) {
throw new IllegalArgumentException("'sourceSet' is required");
}
Set<Object> result = null;
if (this.targetSetClass != null) {
result = BeanUtils.instantiateClass(this.targetSetClass);
}
else {
result = new LinkedHashSet<>(this.sourceSet.size());
}
Class<?> valueType = null;
if (this.targetSetClass != null) {
valueType = ResolvableType.forClass(this.targetSetClass).asCollection().resolveGeneric();
}
if (valueType != null) {
TypeConverter converter = getBeanTypeConverter();
for (Object elem : this.sourceSet) {
result.add(converter.convertIfNecessary(elem, valueType));
}
}
else {
result.addAll(this.sourceSet);
}
return result;
}
}