/*

 * Copyright (c) 2001, 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

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 * questions.

 */

package com.sun.tools.javac.util;

import java.util.*;

import com.sun.tools.javac.main.Option;

import static com.sun.tools.javac.main.Option.*;

/** A table of all command-line options.

 *  If an option has an argument, the option name is mapped to the argument.

 *  If a set option has no argument, it is mapped to itself.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class Options {

    private static final long serialVersionUID = 0;

    /** The context key for the options. */

    public static final Context.Key<Options> optionsKey = new Context.Key<>();

    private LinkedHashMap<String,String> values;

    /** Get the Options instance for this context. */

    public static Options instance(Context context) {

        Options instance = context.get(optionsKey);

        if (instance == null)

            instance = new Options(context);

        return instance;

    }

    protected Options(Context context) {

// DEBUGGING -- Use LinkedHashMap for reproducability

        values = new LinkedHashMap<>();

        context.put(optionsKey, this);

    }

    /**

     * Get the value for an undocumented option.

     */

    public String get(String name) {

        return values.get(name);

    }

    /**

     * Get the value for an option.

     */

    public String get(Option option) {

        return values.get(option.primaryName);

    }

    /**

     * Get the boolean value for an option, patterned after Boolean.getBoolean,

     * essentially will return true, iff the value exists and is set to "true".

     */

    public boolean getBoolean(String name) {

        return getBoolean(name, false);

    }

    /**

     * Get the boolean with a default value if the option is not set.

     */

    public boolean getBoolean(String name, boolean defaultValue) {

        String value = get(name);

        return (value == null) ? defaultValue : Boolean.parseBoolean(value);

    }

    /**

     * Check if the value for an undocumented option has been set.

     */

    public boolean isSet(String name) {

        return (values.get(name) != null);

    }

    /**

     * Check if the value for an option has been set.

     */

    public boolean isSet(Option option) {

        return (values.get(option.primaryName) != null);

    }

    /**

     * Check if the value for a choice option has been set to a specific value.

     */

    public boolean isSet(Option option, String value) {

        return (values.get(option.primaryName + value) != null);

    }

    /**

     * Check if the value for an undocumented option has not been set.

     */

    public boolean isUnset(String name) {

        return (values.get(name) == null);

    }

    /**

     * Check if the value for an option has not been set.

     */

    public boolean isUnset(Option option) {

        return (values.get(option.primaryName) == null);

    }

    /**

     * Check if the value for a choice option has not been set to a specific value.

     */

    public boolean isUnset(Option option, String value) {

        return (values.get(option.primaryName + value) == null);

    }

    public void put(String name, String value) {

        values.put(name, value);

    }

    public void put(Option option, String value) {

        values.put(option.primaryName, value);

    }

    public void putAll(Options options) {

        values.putAll(options.values);

    }

    public void remove(String name) {

        values.remove(name);

    }

    public Set<String> keySet() {

        return values.keySet();

    }

    public int size() {

        return values.size();

    }

    // light-weight notification mechanism

    private List<Runnable> listeners = List.nil();

    public void addListener(Runnable listener) {

        listeners = listeners.prepend(listener);

    }

    public void notifyListeners() {

        for (Runnable r: listeners)

            r.run();

    }

}