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 * Copyright (c) 2021, 2022, 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 jdk.jfr.internal.jfc.model;

import java.util.List;
import java.util.Optional;

// Corresponds <condition>
final class XmlCondition extends XmlExpression implements ControlElement {

    @Override
    public String getName() {
        return attribute("name");
    }

    public Result getTrueValue() {
        return Result.of(attribute("true"));
    }

    public Result getFalseValue() {
        return Result.of(attribute("false"));
    }

    @Override
    protected void validateChildConstraints() throws JFCModelException {
        if (getExpressions().size() > 1) {
            throw new JFCModelException("Expected <condition> to not have more than one child");
        }
    }

    @Override
    protected List<String> attributes() {
        return List.of("name");
    }

    @Override
    protected Result evaluate() {
        Optional<String> trueValue = optional("true");
        Optional<String> falseValue = optional("false");
        for (XmlElement producer : getProducers()) {
            Result r = producer.evaluate();
            if (trueValue.isPresent() && r.isTrue()) {
                return getTrueValue();
            }
            if (falseValue.isPresent() && r.isFalse()) {
                return getFalseValue();
            }
        }
        return Result.NULL;
    }
}