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The Qbicc builder for the java.base JDK module

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/*
 * This code is based on OpenJDK source file(s) which contain the following copyright notice:
 *
 * ------
 * Copyright (c) 2002, 2003, 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.
 * ------
 *
 * This file may contain additional modifications which are Copyright (c) Red Hat and other
 * contributors.
 */

package jdk.internal.loader;

import java.net.URL;
import java.io.File;

import org.qbicc.rt.annotation.Tracking;
import org.qbicc.runtime.Build;
import sun.net.www.ParseUtil;

@Tracking("src/java.base/unix/classes/jdk/internal/loader/FileURLMapper.java")
@Tracking("src/java.base/windows/classes/jdk/internal/loader/FileURLMapper.java")
public class FileURLMapper {

    URL url;
    String path;

    public FileURLMapper(URL url) {
        this.url = url;
    }

    public String getPath() {
        if (path != null) {
            return path;
        }
        String host = url.getHost();
        boolean isEmptyOrLocalHost = host == null || host.isEmpty() || "localhost".equalsIgnoreCase(host);
        if (Build.Target.isWindows()) {
            if (isEmptyOrLocalHost) {
                this.path = ParseUtil.decode(url.getFile().replace('/', '\\'));
            } else {
                String s = host + ParseUtil.decode(url.getFile());
                path = "\\\\" + s.replace('/', '\\');
            }
        } else {
            if (isEmptyOrLocalHost) {
                path = ParseUtil.decode(url.getFile());
            }
        }
        return path;
    }

    public boolean exists() {
        String path = getPath();
        return path != null && new File(path).exists();
    }
}