checkisaccessible.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 6402516
 * @summary need Trees.getScope(TreePath)
 * @build Checker CheckIsAccessible
 * @run main CheckIsAccessible
 */

import java.util.*;
import com.sun.source.tree.*;
import com.sun.source.util.*;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.*;

/*
 * Check the accessibility of items of a scope against the contents of string literals.
 */
public class CheckIsAccessible extends Checker {
    public static void main(String... args) throws Exception {
        Checker chk = new CheckIsAccessible();
	chk.check("TestIsAccessible.java", "A.java");
    }

    @Override
    protected boolean check(Scope s, String ref) {
	System.err.println("checkIsAccessible: " + s + " " + s.getEnclosingClass() + " " + ref);
	if (ref.length() == 0)
	    return true;

	Trees trees = getTrees();
	String[] args = ref.split(" +", 3);
	boolean expect = args[args.length - 1].equals("yes");
	boolean actual;
	switch (args.length) {
	case 2:
	    TypeElement te = getTypeElement(args[0]);
	    actual = trees.isAccessible(s, te);
	    if (actual != expect) 
		error(s, ref, "accessible issue found: " + te + " " + actual);
	    break;
	    
	case 3:
	    DeclaredType site = getType(args[0]);
	    Element member = getMember(args[1]);
	    actual = trees.isAccessible(s, member, site);
	    if (actual != expect) 
		error(s, ref, "accessible issue found: " + member + "@" + site + " " + actual);
	    break;

	default:
	    throw new IllegalArgumentException(ref);
	}

	return (actual == expect);
    }

    private TypeElement getTypeElement(String name) {
	TypeElement te = getElements().getTypeElement(name);
	if (te == null) 
	    throw new IllegalArgumentException("can't find element " + name);
	return te;
    }

    private DeclaredType getType(String name) {
	return (DeclaredType)(getTypeElement(name).asType());
    }

    private Element getMember(String name) {
	int sep = name.indexOf("#");
	String tname = name.substring(0, sep);
	String mname = name.substring(sep+1);
	TypeElement te = getTypeElement(tname);
	for (Element e: te.getEnclosedElements()) {
	    if (mname.contentEquals(e.getSimpleName()))
		return e;
	}
	throw new IllegalArgumentException("can't find member " + mname + " in " + tname);	
    }

}