aspect CollectPackageInfo {

	public static final String Program.PACKAGE_INFO_FILENAME = "package-info.java";
	
	//This takes raw packageDecls, not packageName()
	protected HashMap<String, CompilationUnit> Program.packageInfoMap = 
		new HashMap<String, CompilationUnit>();
	public void Program.addPackageInfo(String packageName, CompilationUnit packageInfo) {
		packageInfoMap.put(packageName, packageInfo);
	}
	public CompilationUnit Program.getPackageInfo(String packageName) {
		return packageInfoMap.get(packageName);
	}
	
	//the raw filename
	public String CompilationUnit.nodirFileName() {
		String nodirFileName = this.relativeName();
		int index = Math.max(
			nodirFileName.lastIndexOf('/'),
			nodirFileName.lastIndexOf('\\')
			);
		if (index != -1) {
			nodirFileName = nodirFileName.substring(index+1);
		}
		return nodirFileName;
	}
	
	public boolean CompilationUnit.isPackageInfoFile() {
		return nodirFileName().equals(Program.PACKAGE_INFO_FILENAME);
	}
	 
	public void Program.collectPackageInfo() {
		
		for (Iterator<CompilationUnit> cuIterator = compilationUnitIterator();
				cuIterator.hasNext(); ) {
			CompilationUnit cu = cuIterator.next();
			if (cu.isPackageInfoFile() && !(cu.getPackageDecl().equals(""))) {
				addPackageInfo(cu.getPackageDecl(), cu);
			}
		}
	}

	//inserts a copy of package-info's moduleDecl (if any) to CUs with the same packageDecl 
	public void Program.insertPackageInfoModuleDecl() {
		
		for (Iterator<CompilationUnit> cuIterator = compilationUnitIterator();
				cuIterator.hasNext(); ) {
			CompilationUnit cu = cuIterator.next();
			if (!(cu.isPackageInfoFile())) {
				CompilationUnit packageInfo = getPackageInfo(cu.getPackageDecl());
				if (packageInfo != null && packageInfo.getModuleDecl() != null) {
					cu.checkedAddModuleDecl(packageInfo);
				}
			}
		}
	}
	
	public void CompilationUnit.checkedAddModuleDecl(CompilationUnit packageInfo) {
		ModuleDecl moduleDecl = packageInfo.getModuleDecl().fullCopy();
		assert (moduleDecl != null) : "moduleDecl parameter should not be null";
		//if already has a module decl and is not equal to the package-info's moduledecl,
		//add an error
		if (this.getModuleDecl() != null && 
				!(this.getModuleDecl().getModuleAccess().getID().equals(
					moduleDecl.getModuleAccess().getID())
				)) {
			this.getModuleDecl().warning("The module declaration is in conflict with the one defined in " + packageInfo.pathName());
			return; 
		}
		
		//add the moduledecl
		setModuleDecl(moduleDecl);
		addChild(moduleDecl); //TODO: This is possibly broken due to hardcoded numbers for getnumchildren
	}
}