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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) 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:
 *     PARC     initial implementation
 * ******************************************************************/
package org.aspectj.ajdt.internal.compiler.lookup;

import java.util.ArrayList;
import java.util.List;

import org.aspectj.org.eclipse.jdt.internal.compiler.ClassFile;
import org.aspectj.org.eclipse.jdt.internal.compiler.CompilationResult;
import org.aspectj.org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.PackageBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.UnresolvedType;

public class HelperInterfaceBinding extends SourceTypeBinding {
	private UnresolvedType typeX;
	SourceTypeBinding enclosingType;
	List methods = new ArrayList<>();

	public HelperInterfaceBinding(SourceTypeBinding enclosingType, UnresolvedType typeX) {
		super();
		this.fPackage = enclosingType.fPackage;
		// this.fileName = scope.referenceCompilationUnit().getFileName();
		this.modifiers = ClassFileConstants.AccPublic | ClassFileConstants.AccInterface
				| ClassFileConstants.AccAbstract;
		this.sourceName = enclosingType.scope.referenceContext.name;
		this.enclosingType = enclosingType;
		this.typeX = typeX;
		this.typeVariables = Binding.NO_TYPE_VARIABLES;
		this.scope = enclosingType.scope;
		this.superInterfaces = new ReferenceBinding[0];
	}

	public HelperInterfaceBinding(char[][] compoundName, PackageBinding fPackage, ClassScope scope) {
		super(compoundName, fPackage, scope);
	}

	public char[] getFileName() {
		return enclosingType.getFileName();
	}

	public UnresolvedType getTypeX() {
		return typeX;
	}

	public void addMethod(EclipseFactory world, ResolvedMember member) {
		MethodBinding binding = world.makeMethodBinding(member);
		this.methods.add(binding);
	}

	public FieldBinding[] fields() {
		return new FieldBinding[0];
	}

	public MethodBinding[] methods() {
		return new MethodBinding[0];
	}

	public char[] constantPoolName() {
		String sig = typeX.getSignature();
		return sig.substring(1, sig.length() - 1).toCharArray();
	}

	public void generateClass(CompilationResult result, ClassFile enclosingClassFile) {
		ClassFile classFile = new ClassFile(this);
		classFile.initialize(this, enclosingClassFile, false);
//		classFile.recordInnerClasses(this);
		// classFile.addFieldInfos();
		classFile.contents[classFile.contentsOffset++] = (byte) 0;
		classFile.contents[classFile.contentsOffset++] = (byte) 0;
		classFile.setForMethodInfos();
		for (MethodBinding b: methods) {
			generateMethod(classFile, b);
		}
		classFile.addAttributes();
		result.record(this.constantPoolName(), classFile);
	}

	private void generateMethod(ClassFile classFile, MethodBinding binding) {
		classFile.generateMethodInfoHeader(binding);
		int methodAttributeOffset = classFile.contentsOffset;
		int attributeNumber = classFile.generateMethodInfoAttributes(binding);
		classFile.completeMethodInfo(binding, methodAttributeOffset, attributeNumber);
	}

	public ReferenceBinding[] superInterfaces() {
		return new ReferenceBinding[0];
	}

}