// Copyright (c) 2013-2014, Webit Team. All Rights Reserved.
package webit.script.lang.method;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import webit.script.Context;
import webit.script.exceptions.ScriptRuntimeException;
import webit.script.lang.MethodDeclare;
import webit.script.util.ClassUtil;
/**
*
* @author Zqq
*/
public final class NativeMethodDeclare implements MethodDeclare {
private final Method method;
private final int argsCount;
private final boolean isStatic;
private final boolean noVoid;
public NativeMethodDeclare(Method method) {
this.method = method;
this.argsCount = method.getParameterTypes().length;
this.isStatic = ClassUtil.isStatic(method);
Class returnType;
this.noVoid = ((returnType = method.getReturnType()) != void.class) && (returnType != Void.class);
}
public Object invoke(final Context context, final Object[] args) {
final Object obj;
final Object[] methodArgs;
final int myArgsCount = this.argsCount;
if (isStatic) {
obj = null;
if (args != null) {
int argsLen;
if ((argsLen = args.length) == myArgsCount) {
methodArgs = args;
} else {
//Note: Warning 参数个数不一致
System.arraycopy(args, 0, methodArgs = new Object[myArgsCount], 0, argsLen <= myArgsCount ? argsLen : myArgsCount);
}
} else {
methodArgs = new Object[myArgsCount];
}
} else {
if (args != null && args.length != 0 && args[0] != null) {
obj = args[0];
int copyLen;
//Note: Warning 参数个数不一致
System.arraycopy(args, 1, methodArgs = new Object[myArgsCount], 0, ((copyLen = args.length - 1) <= myArgsCount) ? copyLen : myArgsCount);
} else {
throw new ScriptRuntimeException("this method need one argument at least");
}
}
try {
Object result = method.invoke(obj, methodArgs);
return noVoid ? result : Context.VOID;
} catch (IllegalAccessException ex) {
throw new ScriptRuntimeException("this method is inaccessible: ".concat(ex.getLocalizedMessage()));
} catch (IllegalArgumentException ex) {
throw new ScriptRuntimeException("illegal argument: ".concat(ex.getLocalizedMessage()));
} catch (InvocationTargetException ex) {
throw new ScriptRuntimeException("this method throws an exception", ex.getTargetException());
}
}
}