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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/* *******************************************************************
 * Copyright (c) 1999-2001 Xerox Corporation,
 *               2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     Xerox/PARC     initial implementation
 *    Alex Vasseur    wired up for @AJ proceeding
 *    Andy Clement 23-06-06 added extras for @AJ
 * ******************************************************************/


package org.aspectj.runtime.internal;

import org.aspectj.lang.ProceedingJoinPoint;

public abstract class AroundClosure {
    protected Object[] state;

    // Records with the related joinpoint has a this or a target and whether
    // either of them are bound in the pointcut.  Set in the 'link' call made
    // at each matching join point... (see pr126167)
    // bit6 being 1 means the flags haven't been initialized
    protected int bitflags = 0x100000;
    protected Object[] preInitializationState;

    public AroundClosure() {
    }

    public AroundClosure(Object[] state) {
    	this.state = state;
    }

    public int getFlags() {return bitflags;}

    public Object[] getState() {
      return state;
    }

	public Object[] getPreInitializationState() {
		return preInitializationState;
	}

	/**
	 * @param args the same arguments as passed to the proceed (with primitives coerced to Object types)
	 * @return the result of the invocation with those arguments
	 * @throws Throwable if underlying invoked code throws an exception
	 */
    public abstract Object run(Object[] args) throws Throwable;

    /**
     * This method is called to implicitly associate the closure with the joinpoint
     * as required for @AJ aspect proceed()
     *
     * @return the associated ProceedingJoinPoint
     */
    public ProceedingJoinPoint linkClosureAndJoinPoint() {
        //TODO is this cast safe ?
        ProceedingJoinPoint jp = (ProceedingJoinPoint)state[state.length-1];
        jp.set$AroundClosure(this);
        return jp;
    }

    /**
     * This method is called to implicitly associate the closure with the joinpoint
     * as required for @AJ aspect proceed()
     *
     * @param flags indicating whether this/target found at joinpoint and bound
     * @return the associated ProceedingJoinPoint
     */
    public ProceedingJoinPoint linkStackClosureAndJoinPoint(int flags) {
        //TODO is this cast safe ?
        ProceedingJoinPoint jp = (ProceedingJoinPoint)state[state.length-1];
        jp.stack$AroundClosure(this);
        this.bitflags = flags;
        return jp;
    }

    /**
     * This method is called to implicitly associate the closure with the joinpoint
     * as required for @AJ aspect proceed()
     *
     * @param flags indicating whether this/target found at joinpoint and bound
     * @return the associated ProceedingJoinPoint
     */
    public ProceedingJoinPoint linkClosureAndJoinPoint(int flags) {
        //TODO is this cast safe ?
        ProceedingJoinPoint jp = (ProceedingJoinPoint)state[state.length-1];
        jp.set$AroundClosure(this);
        this.bitflags = flags;
        return jp;
    }

    public void unlink() {
    	ProceedingJoinPoint jp = (ProceedingJoinPoint)state[state.length-1];
    	jp.stack$AroundClosure(null);
    }

}