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package uk.org.ury.database;
import java.util.HashMap;
import java.util.Map;
import uk.org.ury.database.exceptions.MissingPropertyException;
/**
* An abstract class presenting a template for objects serving as
* a data structure for collections of properties retrieved from
* a SQL database.
*
* @param E The enumeration type used as the property list.
*
* @param T The type of datum stored for each property.
*
* @author Matt Windsor
*/
public abstract class DatabaseItem<E, T>
{
private Map<E, T> properties;
/**
* Construct a new item from an existing list of properties.
*
* @param properties The map of properties that the new item will
* inherit.
*/
public
DatabaseItem (Map<E, T> properties)
{
this.properties = properties;
}
/**
* Check whether a property has been set in the item.
*
* @return true if the property has been set; false otherwise.
*/
public boolean
has (E property)
{
return properties.containsKey (property);
}
/**
* Query this item for a property.
*
* @param property The property to query.
*
* @return The property, if it exists.
*
* @throws MissingPropertyException if the property does
* not exist.
*/
public T
get (E property) throws MissingPropertyException
{
if (properties.containsKey (property))
return properties.get (property);
else
throw new MissingPropertyException (property.toString ());
}
/**
* Retrieve a map of string representations of the properties.
*
* This relies on E and T having meaningful toString methods.
*
* @return a list of lines representing the response.
*/
public Map<String, String>
asResponse ()
{
// TODO: Fan out implementation details into separate class
Map<String, String> response = new HashMap<String, String> ();
for (E property : properties.keySet ())
{
if (properties.get (property) != null)
response.put (property.toString (),
properties.get (property).toString ());
}
return response;
}
}
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