/**
* Helper method for subclasses to implement getFooAttribute(String attributeName), as such:
*
* <pre>
* public class User
* {
* private final Set<UserAttribute> userAttributes = new HashSet<UserAttribute>();
*
* public String getUserAttribute(String attributeName)
* {
* return PersistentAttribute.getAttribute(userAttributes, attributeName);
* }
* }
* </pre>
*
* @param attributeSet the set of objects derived from PersistentAttribute to turn into a
* Map<String,String>
* @param attributeName the name of the desired attribute
* @return the attribute value or null if the attribute does not exist
*/
public static <OwnerClass, AttributeClass extends PersistentAttribute<OwnerClass>>
String getAttribute(Set<AttributeClass> attributeSet, String attributeName) {
for (AttributeClass attribute : attributeSet) {
if (attribute.getName().equals(attributeName)) return attribute.getValue();
}
return null;
}
/**
* Helper method for subclasses to implement getFooAttributes(), as such:
*
* <pre>
* public class User
* {
* private final Set<UserAttribute> userAttributes = new HashSet<UserAttribute>();
*
* public Map<String,String> getUserAttributes()
* {
* return PersistentAttribute.buildMap(userAttributes);
* }
* }
* </pre>
*
* @param attributeSet the set of objects derived from PersistentAttribute to turn into a
* Map<String,String>
* @return an unmodifiable Map representing the attributes attached to the object
*/
public static <OwnerClass, AttributeClass extends PersistentAttribute<OwnerClass>>
Map<String, String> buildMap(Set<AttributeClass> attributeSet) {
Map<String, String> map = new HashMap<String, String>(attributeSet.size());
for (AttributeClass attribute : attributeSet) {
map.put(attribute.getName(), attribute.getValue());
}
return Collections.unmodifiableMap(map);
}
