/*

 * Copyright (c) 2015, 2016, 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.

 */

package javax.xml.catalog;

import java.io.File;

import java.net.MalformedURLException;

import java.net.URI;

import java.net.URISyntaxException;

import java.net.URL;

import java.nio.file.Path;

import java.nio.file.Paths;

import jdk.xml.internal.SecuritySupport;

/**

 *

 * @since 9

 */

class Util {

    /**

     * Resolves the specified file path to an absolute systemId. If it is

     * relative, it shall be resolved using the base or user.dir property if

     * base is not specified.

     *

     * @param file The specified file path

     * @param baseURI the base URI

     * @return The URI

     * @throws CatalogException if the specified file path can not be converted

     * to a system id

     */

    static URI verifyAndGetURI(String file, URL baseURI)

            throws MalformedURLException, URISyntaxException, IllegalArgumentException {

        URL filepath;

        URI temp;

        if (file != null && file.length() > 0) {

            File f = new File(file);

            if (baseURI != null && !f.isAbsolute()) {

                filepath = new URL(baseURI, fixSlashes(file));

                temp = filepath.toURI();

            } else {

                temp = resolveURI(file);

            }

            //Paths.get may throw IllegalArgumentException

            Path path = Paths.get(temp);

            if (path.toFile().isFile()) {

                return temp;

            }

        }

        return null;

    }

    /**

     * Resolves the specified uri. If the uri is relative, makes it absolute by

     * the user.dir directory.

     *

     * @param uri The specified URI.

     * @return The resolved URI

     */

    static URI resolveURI(String uri) throws MalformedURLException {

        if (uri == null) {

            uri = "";

        }

        URI temp = null;

        try {

            URL url = new URL(uri);

            temp = url.toURI();

        } catch (MalformedURLException | URISyntaxException mue) {

            File file = new File(uri);

            temp = file.toURI();

        }

        return temp;

    }

    /**

     * Replace backslashes with forward slashes. (URLs always use forward

     * slashes.)

     *

     * @param sysid The input system identifier.

     * @return The same system identifier with backslashes turned into forward

     * slashes.

     */

    static String fixSlashes(String sysid) {

        return sysid.replace('\\', '/');

    }

    /**

     * Find catalog file paths by reading the system property, and then

     * jaxp.properties if the system property is not specified.

     *

     * @param sysPropertyName the name of system property

     * @return the catalog file paths, or null if not found.

     */

    static String[] getCatalogFiles(String sysPropertyName) {

        String value = SecuritySupport.getJAXPSystemProperty(sysPropertyName);

        if (value != null && !value.equals("")) {

            return value.split(";");

        }

        return null;

    }

    /**

     * Checks whether the specified string is null or empty, returns the original

     * string with leading and trailing spaces removed if not.

     * @param test the string to be tested

     * @return the original string with leading and trailing spaces removed,

     * or null if it is null or empty

     *

     */

    static String getNotNullOrEmpty(String test) {

        if (test == null) {

            return test;

        } else {

            String temp = test.trim();

            if (temp.length() == 0) {

                return null;

            } else {

                return temp;

            }

        }

    }

}