/*

 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * The Original Code is HAT. The Initial Developer of the

 * Original Code is Bill Foote, with contributions from others

 * at JavaSoft/Sun.

 */

package com.sun.tools.hat.internal.server;

import com.sun.tools.hat.internal.model.JavaClass;

import com.sun.tools.hat.internal.model.Snapshot;

import java.util.LinkedList;

import java.io.InputStream;

import java.io.Reader;

import java.io.InputStreamReader;

import java.io.BufferedReader;

import java.io.IOException;

/**

 * This class is a helper that determines if a class is a "platform"

 * class or not.  It's a platform class if its name starts with one of

 * the prefixes to be found in /com/sun/tools/hat/resources/platform_names.txt.

 *

 * @author      Bill Foote

 */

public class PlatformClasses  {

    static String[] names = null;

    public static synchronized String[] getNames() {

        if (names == null) {

            LinkedList<String> list = new LinkedList<String>();

            InputStream str

                = PlatformClasses.class

                    .getResourceAsStream("/com/sun/tools/hat/resources/platform_names.txt");

            if (str != null) {

                try {

                    BufferedReader rdr

                        = new BufferedReader(new InputStreamReader(str));

                    for (;;) {

                        String s = rdr.readLine();

                        if (s == null) {

                            break;

                        } else if (s.length() > 0) {

                            list.add(s);

                        }

                    }

                    rdr.close();

                    str.close();

                } catch (IOException ex) {

                    ex.printStackTrace();

                    // Shouldn't happen, and if it does, continuing

                    // is the right thing to do anyway.

                }

            }

            names = list.toArray(new String[list.size()]);

        }

        return names;

    }

    public static boolean isPlatformClass(JavaClass clazz) {

        // all classes loaded by bootstrap loader are considered

        // platform classes. In addition, the older name based filtering

        // is also done for compatibility.

        if (clazz.isBootstrap()) {

            return true;

        }

        String name = clazz.getName();

        // skip even the array classes of the skipped classes.

        if (name.startsWith("[")) {

            int index = name.lastIndexOf('[');

            if (index != -1) {

                if (name.charAt(index + 1) != 'L') {

                    // some primitive array.

                    return true;

                }

                // skip upto 'L' after the last '['.

                name = name.substring(index + 2);

            }

        }

        String[] nms = getNames();

        for (int i = 0; i < nms.length; i++) {

            if (name.startsWith(nms[i])) {

                return true;

            }

        }

        return false;

    }

}