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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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