package net.pterodactylus.rhynodge.states;
+import static java.util.Optional.empty;
+import static java.util.Optional.ofNullable;
+
import java.io.File;
import java.io.IOException;
+import java.util.Optional;
import net.pterodactylus.rhynodge.State;
*
* @param reactionName
* The name of the reaction
- * @return The loaded state, or {@code null} if the state could not be
+ * @return The loaded state, or {@link Optional#empty()} if the state could not be
* loaded
*/
- public State loadLastState(String reactionName) {
+ public Optional<State> loadLastState(String reactionName) {
return loadLastState(reactionName, false);
}
*
* @param reactionName
* The name of the reaction
- * @return The loaded state, or {@code null} if the state could not be
+ * @return The loaded state, or {@link Optional#empty()} if the state could not be
* loaded
*/
- public State loadLastSuccessfulState(String reactionName) {
+ public Optional<State> loadLastSuccessfulState(String reactionName) {
return loadLastState(reactionName, true);
}
* The state to save
*/
public void saveState(String reactionName, State state) {
+ File stateFile = null;
try {
- File stateFile = stateFile(reactionName, "last");
+ stateFile = stateFile(reactionName, "last");
objectMapper.writeValue(stateFile, state);
if (state.success()) {
stateFile = stateFile(reactionName, "success");
}
} catch (JsonGenerationException jge1) {
logger.warn(String.format("State for Reaction “%s” could not be generated.", reactionName), jge1);
+ stateFile.delete();
} catch (JsonMappingException jme1) {
logger.warn(String.format("State for Reaction “%s” could not be generated.", reactionName), jme1);
+ stateFile.delete();
} catch (IOException ioe1) {
logger.warn(String.format("State for Reaction “%s” could not be written.", reactionName));
+ stateFile.delete();
}
}
* @param successful
* {@code true} to load the last successful state, {@code false}
* to load the last state
- * @return The loaded state, or {@code null} if the state could not be
+ * @return The loaded state, or {@link Optional#empty()} if the state could not be
* loaded
*/
- private State loadLastState(String reactionName, boolean successful) {
+ private Optional<State> loadLastState(String reactionName, boolean successful) {
File stateFile = stateFile(reactionName, successful ? "success" : "last");
try {
State state = objectMapper.readValue(stateFile, AbstractState.class);
- return state;
+ return ofNullable(state);
} catch (JsonParseException jpe1) {
logger.warn(String.format("State for Reaction “%s” could not be parsed.", reactionName), jpe1);
} catch (JsonMappingException jme1) {
} catch (IOException ioe1) {
logger.info(String.format("State for Reaction “%s” could not be found.", reactionName));
}
- return null;
+ return empty();
}
}