/**
* Returns the value to which the specified key is mapped, or null if this map contains no mapping
* for the key. Safe version of get().
*
* <pre>{@code
* Integer i = <Integer> map.get(key1, Integer);
* }</pre>
*
* @param key key with which the specified value is to be associated.
* @param type expected type.
* @param defaultValue default value to return.
* @param <T> type of return and default value, inferred
* @return Value.
*/
public <T> T get(ExtKey key, Class<T> type, T defaultValue) {
if (!key.getType().isAssignableFrom(type)) {
throw new IllegalArgumentException(
String.format("Cannnot assign key '%s' into type '%s'", key, type));
}
if (defaultValue != null && !key.getType().isAssignableFrom(defaultValue.getClass())) {
throw new IllegalArgumentException(
String.format(
"Cannnot assign default value of '%s' into type '%s'", defaultValue.getClass(), key));
}
T value = type.cast(map.get(key));
if (value == null) {
value = defaultValue;
}
return value;
}
/**
* Returns the value to which the specified key is mapped, or default. Unsafe method of get with
* cast.
*
* <pre>{@code
* Integer i = <Integer> map.get(key1, 5);
* }</pre>
*
* @param key key.
* @param defaultValue default value.
* @param <T> type of return and default value, inferred
* @return Value.
*/
@SuppressWarnings("unchecked")
public <T> T get(ExtKey key, Object defaultValue) {
if (defaultValue != null && !key.getType().isAssignableFrom(defaultValue.getClass())) {
throw new IllegalArgumentException(
String.format(
"Cannnot assign default value of '%s' into type '%s'", defaultValue.getClass(), key));
}
Object value = get(key);
if (value == null) {
value = defaultValue;
}
return (T) value;
}
/** Check if value matches key type. */
private void checkKeyValue(ExtKey key, Object value) {
if (!key.getType().isInstance(value)) {
throw new IllegalArgumentException(
String.format("Cannnot assign type '%s' into key '%s'", value.getClass(), key));
}
}
