001/*
002 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package jdk.internal.jvmci.options;
024
025/**
026 * A nested Boolean {@link OptionValue} that can be overridden by a {@link #masterOption master
027 * option}.
028 * <p>
029 * <li>If the option is present on the command line the specified value is used.
030 * <li>Otherwise {@link #getValue()} depends on the {@link #masterOption} and evaluates as follows:
031 * <ul>
032 * <li>If {@link #masterOption} is set, this value equals to {@link #initialValue}.
033 * <li>Otherwise, if {@link #masterOption} is {@code false}, this option is {@code false}.
034 */
035public class NestedBooleanOptionValue extends OptionValue<Boolean> {
036    private final OptionValue<Boolean> masterOption;
037    private final Boolean initialValue;
038
039    public NestedBooleanOptionValue(OptionValue<Boolean> masterOption, Boolean initialValue) {
040        super(null);
041        this.masterOption = masterOption;
042        this.initialValue = initialValue;
043    }
044
045    public OptionValue<Boolean> getMasterOption() {
046        return masterOption;
047    }
048
049    @Override
050    public Boolean getValue() {
051        Boolean v = super.getValue();
052        if (v == null) {
053            return initialValue && masterOption.getValue();
054        }
055        return v;
056    }
057
058}