JsonEvent.java
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/*
* This file is part of LiteLoader.
* Copyright (C) 2012-16 Adam Mummery-Smith
* All Rights Reserved.
*/
package com.mumfrey.liteloader.transformers.event.json;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.spongepowered.asm.mixin.injection.InjectionPoint;
import com.google.gson.annotations.SerializedName;
import com.mumfrey.liteloader.transformers.event.Event;
import com.mumfrey.liteloader.transformers.event.MethodInfo;
/**
* An event definition in JSON, serialisable class read by Gson
*
* @author Adam Mummery-Smith
*/
public class JsonEvent implements Serializable
{
private static final long serialVersionUID = 1L;
private static int nextEventID = 0;
/**
* Event name
*/
@SerializedName("name")
private String name;
/**
* Whether the event is cancellable
*/
@SerializedName("cancellable")
private boolean cancellable;
/**
* Event priority (relative to other events at the same injection point)
*/
@SerializedName("priority")
private int priority = 1000;
/**
* Injection points specified in the JSON file
*/
@SerializedName("injections")
private List<JsonInjection> jsonInjections;
/**
* Listeners defined in the JSON file
*/
@SerializedName("listeners")
private List<String> jsonListeners;
/**
* Listener methods parsed from the JSON
*/
private transient List<MethodInfo> listeners = new ArrayList<MethodInfo>();
/**
* Get the name of this event
*/
public String getName()
{
if (this.name == null)
{
this.name = "onUserEvent" + (JsonEvent.nextEventID++);
}
return this.name;
}
/**
* Get whether this event is cancellable or not
*/
public boolean isCancellable()
{
return this.cancellable;
}
/**
* Get the event priority
*/
public int getPriority()
{
return this.priority;
}
/**
* Get the list of listeners parsed from the JSON
*/
public List<MethodInfo> getListeners()
{
return this.listeners;
}
/**
* Parse the JSON to initialise this object
*/
public void parse(JsonMethods methods)
{
this.parseInjectionPoints(methods);
this.parseListeners(methods);
}
/**
* @param methods
*/
private void parseInjectionPoints(JsonMethods methods)
{
if (this.jsonInjections == null || this.jsonInjections.isEmpty())
{
throw new InvalidEventJsonException("Event " + this.getName() + " does not have any defined injections");
}
for (JsonInjection injection : this.jsonInjections)
{
injection.parse(methods);
}
}
/**
* @param methods
*/
private void parseListeners(JsonMethods methods)
{
if (this.jsonListeners == null || this.jsonListeners.isEmpty())
{
throw new InvalidEventJsonException("Event " + this.getName() + " does not have any defined listeners");
}
for (String listener : this.jsonListeners)
{
this.listeners.add(methods.get(listener));
}
}
/**
* @param transformer Transformer to register events with
* @return Event which was registered
*/
public Event register(ModEventInjectionTransformer transformer)
{
Event event = Event.getOrCreate(this.getName(), this.isCancellable(), this.getPriority());
for (JsonInjection injection : this.jsonInjections)
{
MethodInfo targetMethod = injection.getMethod();
InjectionPoint injectionPoint = injection.getInjectionPoint();
transformer.registerEvent(event, targetMethod, injectionPoint);
}
for (MethodInfo listener : this.listeners)
{
event.addListener(listener);
}
return event;
}
}