JsonInjection.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.lang.reflect.Constructor;
import org.spongepowered.asm.mixin.injection.InjectionPoint;
import com.google.gson.annotations.SerializedName;
import com.mumfrey.liteloader.transformers.event.MethodInfo;
import com.mumfrey.liteloader.transformers.event.inject.BeforeInvoke;
import com.mumfrey.liteloader.transformers.event.inject.BeforeReturn;
import com.mumfrey.liteloader.transformers.event.inject.BeforeStringInvoke;
import com.mumfrey.liteloader.transformers.event.inject.MethodHead;
/**
* A JSON injection point definition
*
* @author Adam Mummery-Smith
*/
public class JsonInjection implements Serializable
{
private static final long serialVersionUID = 1L;
/**
* Method to inject into
*/
@SerializedName("method")
private String methodName;
/**
* Type of injection point
*/
@SerializedName("type")
private JsonInjectionType type;
/**
* Shift type (optional)
*/
@SerializedName("shift")
private JsonInjectionShiftType shift;
/**
* Target method to search for when using INVOKE and INVOKESTRING
*/
@SerializedName("target")
private String target;
/**
* Ordinal to use when using INVOKE and INVOKESTRING
*/
@SerializedName("ordinal")
private int ordinal = -1;
/**
* InjectionPoint class to use for CUSTOM
*/
@SerializedName("class")
private String className;
/**
* Constructor arguments to pass wehn using CUSTOM
*/
@SerializedName("args")
private Object[] args;
private transient MethodInfo method;
private transient InjectionPoint injectionPoint;
public MethodInfo getMethod()
{
return this.method;
}
public InjectionPoint getInjectionPoint()
{
return this.injectionPoint;
}
public void parse(JsonMethods methods)
{
this.method = this.parseMethod(methods);
this.injectionPoint = this.parseInjectionPoint(methods);
}
private MethodInfo parseMethod(JsonMethods methods)
{
try
{
return methods.get(this.methodName);
}
catch (NullPointerException ex)
{
throw new InvalidEventJsonException("'method' must not be null for injection");
}
}
public InjectionPoint parseInjectionPoint(JsonMethods methods)
{
switch (this.type)
{
case INVOKE:
return this.applyShift(new BeforeInvoke(methods.get(this.getTarget()), this.ordinal));
case INVOKESTRING:
return this.applyShift(new BeforeStringInvoke(this.getArg(0).toString(), methods.get(this.getTarget()), this.ordinal));
case RETURN:
return this.applyShift(new BeforeReturn(this.ordinal));
case HEAD:
return new MethodHead();
case CUSTOM:
try
{
@SuppressWarnings("unchecked")
Class<InjectionPoint> injectionPointClass = (Class<InjectionPoint>)Class.forName(this.className);
if (this.args != null)
{
Constructor<InjectionPoint> ctor = injectionPointClass.getDeclaredConstructor(Object[].class);
return ctor.newInstance(this.args);
}
return injectionPointClass.newInstance();
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
default:
throw new InvalidEventJsonException("Could not parse injection type");
}
}
private Object getArg(int arg)
{
if (this.args == null || this.args.length >= this.args.length || arg < 0)
{
return "";
}
return this.args[arg];
}
private String getTarget()
{
if (this.target != null && this.shift == null)
{
if (this.target.startsWith("before(") && this.target.endsWith(")"))
{
this.target = this.target.substring(7, this.target.length() - 1);
this.shift = JsonInjectionShiftType.BEFORE;
}
else if (this.target.startsWith("after(") && this.target.endsWith(")"))
{
this.target = this.target.substring(6, this.target.length() - 1);
this.shift = JsonInjectionShiftType.AFTER;
}
}
if (this.target == null)
{
throw new InvalidEventJsonException("'target' is required for injection type " + this.type.name());
}
return this.target;
}
private InjectionPoint applyShift(InjectionPoint injectionPoint)
{
if (this.shift != null)
{
switch (this.shift)
{
case AFTER:
return InjectionPoint.after(injectionPoint);
case BEFORE:
return InjectionPoint.before(injectionPoint);
default:
return injectionPoint;
}
}
return injectionPoint;
}
}