/*

 * Copyright (c) 2009, 2017, 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 jdk.internal.module;

/**

 * Utility class for checking module, package, and class names.

 */

public final class Checks {

    private Checks() { }

    /**

     * Checks a name to ensure that it's a legal module name.

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         module name

     */

    public static String requireModuleName(String name) {

        if (name == null)

            throw new IllegalArgumentException("Null module name");

        int next;

        int off = 0;

        while ((next = name.indexOf('.', off)) != -1) {

                throw new IllegalArgumentException(name + ": Invalid module name"

                        + ": '" + id + "' is not a Java identifier");

            }

            off = next+1;

        }

            throw new IllegalArgumentException(name + ": Invalid module name"

        }

        return name;

    }

    /**

     * Returns {@code true} if the given name is a legal module name.

     */

    public static boolean isModuleName(String name) {

        int next;

        int off = 0;

        while ((next = name.indexOf('.', off)) != -1) {

                return false;

            off = next+1;

        }

    }

    /**

     * Checks a name to ensure that it's a legal package name.

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         package name

     */

    public static String requirePackageName(String name) {

        return requireTypeName("package name", name);

    }

    /**

     * Returns {@code true} if the given name is a legal package name.

     */

    public static boolean isPackageName(String name) {

        return isTypeName(name);

    }

    /**

     * Checks a name to ensure that it's a legal qualified class name

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         qualified class name

     */

    public static String requireServiceTypeName(String name) {

        return requireQualifiedClassName("service type name", name);

    }

    /**

     * Checks a name to ensure that it's a legal qualified class name.

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         qualified class name

     */

    public static String requireServiceProviderName(String name) {

        return requireQualifiedClassName("service provider name", name);

    }

    /**

     * Checks a name to ensure that it's a legal qualified class name in

     * a named package.

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         qualified class name in a named package

     */

    public static String requireQualifiedClassName(String what, String name) {

        requireTypeName(what, name);

        if (name.indexOf('.') == -1)

            throw new IllegalArgumentException(name + ": is not a qualified name of"

                                               + " a Java class in a named package");

        return name;

    }

    /**

     * Returns {@code true} if the given name is a legal class name.

     */

    public static boolean isClassName(String name) {

        return isTypeName(name);

    }

    /**

     * Returns {@code true} if the given name is a legal type name.

     */

    private static boolean isTypeName(String name) {

        int next;

        int off = 0;

        while ((next = name.indexOf('.', off)) != -1) {

                return false;

            off = next+1;

        }

    }

    /**

     * Checks if the given name is a legal type name.

     *

     * @throws IllegalArgumentException if name is null or not a legal

     *         type name

     */

    private static String requireTypeName(String what, String name) {

        if (name == null)

            throw new IllegalArgumentException("Null " + what);

        int next;

        int off = 0;

        while ((next = name.indexOf('.', off)) != -1) {

                throw new IllegalArgumentException(name + ": Invalid " + what

                        + ": '" + id + "' is not a Java identifier");

            }

            off = next + 1;

        }

            throw new IllegalArgumentException(name + ": Invalid " + what

        }

        return name;

    }

    /**

     */

            return false;

        int i = Character.charCount(first);

            if (!Character.isJavaIdentifierPart(cp))

            i += Character.charCount(cp);

        }

    }

}