/*

 * Copyright (c) 2018, 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.api.settings;

import java.util.HashSet;

import java.util.Set;

import java.util.StringJoiner;

import jdk.jfr.Description;

import jdk.jfr.Label;

import jdk.jfr.MetadataDefinition;

import jdk.jfr.SettingControl;

@Label("String List")

@Description("Accepts set of strings, such as \"text\" or \"text1\", \"text2\", or nothing to reject all strings")

@MetadataDefinition

public final class StringListSetting extends SettingControl {

    private Set<String> acceptedStrings = new HashSet<>();

    @Override

    public void setValue(String s) {

        acceptedStrings = parseSetting(s);

    }

    private Set<String> parseSetting(String s) {

        Set<String> stringSet = new HashSet<>();

        StringBuilder sb = new StringBuilder();

        boolean inString = false;

        for (int index = 0; index < s.length(); index++) {

            char c = s.charAt(index);

            if (c != '"') {

                if (inString) {

                    // escape double quotes

                    if (c == '\\' && index + 1 < s.length()) {

                        if (s.charAt(index + 1) == '"') {

                            index++;

                            c = '"';

                        }

                    }

                    sb.append(c);

                }

            } else {

                if (inString) {

                    stringSet.add(sb.toString());

                    sb.setLength(0);

                }

                inString = !inString;

            }

        }

        return stringSet;

    }

    @Override

    public String getValue() {

        StringJoiner sj = new StringJoiner(", ", "\"", "\"");

        for (String s : acceptedStrings) {

            sj.add(s);

        }

        return sj.toString();

    }

    @Override

    public String combine(Set<String> values) {

        Set<String> nameSet = new HashSet<>();

        for (String s : values) {

            nameSet.addAll(parseSetting(s));

        }

        if (nameSet.isEmpty()) {

            return "";

        }

        StringJoiner sj = new StringJoiner(", ");

        for (String s : nameSet) {

            s = s.replace("\"", "\\\""); // escape quotes

            sj.add("\"" + s + "\"");

        }

        return sj.toString();

    }

    public boolean accept(String string) {

        return acceptedStrings.contains(string);

    }

}