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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) 2005 Contributors.
 * 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:
 *   Adrian Colyer			Initial implementation
 * ******************************************************************/
package org.aspectj.internal.lang.reflect;

import java.lang.reflect.Method;
import java.lang.reflect.Type;

import org.aspectj.lang.annotation.AdviceName;
import org.aspectj.lang.reflect.Advice;
import org.aspectj.lang.reflect.AdviceKind;
import org.aspectj.lang.reflect.AjType;
import org.aspectj.lang.reflect.AjTypeSystem;
import org.aspectj.lang.reflect.PointcutExpression;

/**
 * @author colyer
 *
 */
public class AdviceImpl implements Advice {

	private static final String AJC_INTERNAL = "org.aspectj.runtime.internal";

	private final AdviceKind kind;
	private final Method adviceMethod;
	private PointcutExpression pointcutExpression;
	private boolean hasExtraParam = false;
	private Type[] genericParameterTypes;
	private AjType[] parameterTypes;
	private AjType[] exceptionTypes;

	protected AdviceImpl(Method method, String pointcut, AdviceKind type) {
		this.kind = type;
		this.adviceMethod = method;
		this.pointcutExpression = new PointcutExpressionImpl(pointcut);
	}

	protected AdviceImpl(Method method, String pointcut, AdviceKind type, String extraParamName) {
		this(method,pointcut,type);
		this.hasExtraParam = true;
	}

	public AjType getDeclaringType() {
		return AjTypeSystem.getAjType(adviceMethod.getDeclaringClass());
	}

	public Type[] getGenericParameterTypes() {
		if (this.genericParameterTypes == null) {
			Type[] genTypes = adviceMethod.getGenericParameterTypes();
			int syntheticCount = 0;
			for (Type t : genTypes) {
				if (t instanceof Class) {
					if (((Class)t).getPackage().getName().equals(AJC_INTERNAL)) syntheticCount++;
				}
			}
			this.genericParameterTypes = new Type[genTypes.length - syntheticCount];
			for (int i = 0; i < genericParameterTypes.length; i++) {
				if (genTypes[i] instanceof Class) {
					this.genericParameterTypes[i] = AjTypeSystem.getAjType((Class)genTypes[i]);
				} else {
					this.genericParameterTypes[i] = genTypes[i];
				}
			}
		}
		return this.genericParameterTypes;
	}

	public AjType[] getParameterTypes() {
		if (this.parameterTypes == null) {
			Class[] ptypes = adviceMethod.getParameterTypes();
			int syntheticCount = 0;
			for(Class c : ptypes) {
				if (c.getPackage().getName().equals(AJC_INTERNAL)) syntheticCount++;
			}
			this.parameterTypes = new AjType[ptypes.length - syntheticCount];
			for (int i = 0; i < parameterTypes.length; i++) {
				this.parameterTypes[i] = AjTypeSystem.getAjType(ptypes[i]);
			}
		}
		return this.parameterTypes;
	}

	public AjType[] getExceptionTypes() {
		if (this.exceptionTypes == null) {
			Class[] exTypes = adviceMethod.getExceptionTypes();
			this.exceptionTypes = new AjType[exTypes.length];
			for (int i = 0; i < exTypes.length; i++) {
				this.exceptionTypes[i] = AjTypeSystem.getAjType(exTypes[i]);
			}
		}
		return this.exceptionTypes;
	}

	public AdviceKind getKind() {
		return kind;
	}

	public String getName() {
		String adviceName = adviceMethod.getName();
		if (adviceName.startsWith("ajc$")) {
			adviceName = "";
			AdviceName name = adviceMethod.getAnnotation(AdviceName.class);
			if (name != null) adviceName = name.value();
		}
		return adviceName;
	}

	public PointcutExpression getPointcutExpression() {
		return pointcutExpression;
	}

	public String toString() {
		StringBuilder sb = new StringBuilder();
		if (getName().length() > 0) {
			sb.append("@AdviceName(\"");
			sb.append(getName());
			sb.append("\") ");
		}
		if (getKind() == AdviceKind.AROUND) {
			sb.append(adviceMethod.getGenericReturnType().toString());
			sb.append(" ");
		}
		switch(getKind()) {
		case AFTER:
			sb.append("after(");
			break;
		case AFTER_RETURNING:
			sb.append("after(");
			break;
		case AFTER_THROWING:
			sb.append("after(");
			break;
		case AROUND:
			sb.append("around(");
			break;
		case BEFORE:
			sb.append("before(");
			break;
		}
		AjType[] ptypes = getParameterTypes();
		int len = ptypes.length;
		if (hasExtraParam) len--;
		for (int i = 0; i < len; i++) {
			sb.append(ptypes[i].getName());
			if (i+1 < len) sb.append(",");
		}
		sb.append(") ");
		switch(getKind()) {
		case AFTER_RETURNING:
			sb.append("returning");
			if (hasExtraParam) {
				sb.append("(");
				sb.append(ptypes[len-1].getName());
				sb.append(") ");
			}
		case AFTER_THROWING:
			sb.append("throwing");
			if (hasExtraParam) {
				sb.append("(");
				sb.append(ptypes[len-1].getName());
				sb.append(") ");
			}
		default: // no-op
		}
		AjType[] exTypes = getExceptionTypes();
		if (exTypes.length > 0) {
			sb.append("throws ");
			for (int i = 0; i < exTypes.length; i++) {
				sb.append(exTypes[i].getName());
				if (i+1 < exTypes.length) sb.append(",");
			}
			sb.append(" ");
		}
		sb.append(": ");
		sb.append(getPointcutExpression().asString());
		return sb.toString();
	}

}