/*

 * Copyright (c) 1997, 2014, 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

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 */

package com.sun.javadoc;

/**

 * This is an example of a starting class for a doclet,

 * showing the entry-point methods.  A starting class must

 * import com.sun.javadoc.* and implement the

 * {@code start(RootDoc)} method, as described in the

 * <a href="package-summary.html#package_description">package

 * description</a>.  If the doclet takes command line options,

 * it must also implement {@code optionLength} and

 * {@code validOptions}.

 *

 * <p> A doclet supporting the language features added since 1.1

 * (such as generics and annotations) should indicate this

 * by implementing {@code languageVersion}.  In the absence of

 * this the doclet should not invoke any of the Doclet API methods

 * added since 1.5, and

 * the results of several other methods are modified so as

 * to conceal the new constructs (such as type parameters) from

 * the doclet.

 *

 * <p> To start the doclet, pass

 * {@code -doclet} followed by the fully-qualified

 * name of the starting class on the javadoc tool command line.

 */

public abstract class Doclet {

    /**

     * Generate documentation here.

     * This method is required for all doclets.

     *

     * @param root Supply the RootDoc to the method.

     * @return true on success.

     */

    public static boolean start(RootDoc root) {

        return true;

    }

    /**

     * Check for doclet-added options.  Returns the number of

     * arguments you must specify on the command line for the

     * given option.  For example, "-d docs" would return 2.

     * <P>

     * This method is required if the doclet contains any options.

     * If this method is missing, Javadoc will print an invalid flag

     * error for every option.

     *

     * @param option the option for which the number of arguements is returned.

     * @return number of arguments on the command line for an option

     *         including the option name itself.  Zero return means

     *         option not known.  Negative value means error occurred.

     */

    public static int optionLength(String option) {

        return 0;  // default is option unknown

    }

    /**

     * Check that options have the correct arguments.

     * <P>

     * This method is not required, but is recommended,

     * as every option will be considered valid if this method

     * is not present.  It will default gracefully (to true)

     * if absent.

     * <P>

     * Printing option related error messages (using the provided

     * DocErrorReporter) is the responsibility of this method.

     *

     * @param options Supply valid options as an array of Strings.

     * @param reporter The DocErrorReporter responsible for these options.

     * @return true if the options are valid.

     */

    public static boolean validOptions(String options[][],

                                       DocErrorReporter reporter) {

        return true;  // default is options are valid

    }

    /**

     * Return the version of the Java Programming Language supported

     * by this doclet.

     * <p>

     * This method is required by any doclet supporting a language version

     * newer than 1.1.

     *

     * @return  the language version supported by this doclet.

     * @since 1.5

     */

    public static LanguageVersion languageVersion() {

        return LanguageVersion.JAVA_1_1;

    }

}