/*

 * Copyright (c) 2016, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.management.jfr;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import javax.management.openmbean.CompositeData;

import javax.management.openmbean.TabularData;

import jdk.jfr.Configuration;

/**

 * Management representation of a {@code Configuration}.

 *

 * @see Configuration

 *

 * @since 9

 */

public final class ConfigurationInfo {

    private final Map<String, String> settings;

    private final String name;

    private final String label;

    private final String description;

    private final String provider;

    private final String contents;

    ConfigurationInfo(Configuration config) {

        this.settings = config.getSettings();

        this.name = config.getName();

        this.label = config.getLabel();

        this.description = config.getDescription();

        this.provider = config.getProvider();

        this.contents = config.getContents();

    }

    private ConfigurationInfo(CompositeData cd) {

        this.settings = createMap(cd.get("settings"));

        this.name = (String) cd.get("name");

        this.label = (String) cd.get("label");

        this.description = (String) cd.get("description");

        this.provider = (String) cd.get("provider");

        this.contents = (String) cd.get("contents");

    }

    private static Map<String, String> createMap(Object o) {

        if (o instanceof TabularData) {

            TabularData td = (TabularData) o;

            Collection<?> values = td.values();

            Map<String, String> map = new HashMap<>(values.size());

            for (Object value : td.values()) {

                if (value instanceof CompositeData) {

                    CompositeData cdRow = (CompositeData) value;

                    Object k = cdRow.get("key");

                    Object v = cdRow.get("value");

                    if (k instanceof String && v instanceof String) {

                        map.put((String) k, (String) v);

                    }

                }

            }

            return Collections.unmodifiableMap(map);

        }

        return Collections.emptyMap();

    }

    /**

     * Returns the provider of the configuration associated with this

     * {@code ConfigurationInfo} (for example, {@code "OpenJDK"}).

     *

     * @return the provider, or {@code null} if doesn't exist

     *

     * @see Configuration#getProvider()

     */

    public String getProvider() {

        return provider;

    }

    /**

     * Returns the textual representation of the configuration associated with

     * this {@code ConfigurationInfo}, typically the contents of the

     * configuration file that was used to create the configuration.

     *

     * @return contents, or {@code null} if doesn't exist

     *

     * @see Configuration#getContents()

     */

    public String getContents() {

        return contents;

    }

    /**

     * Returns the settings for the configuration associated with this

     * {@code ConfigurationInfo}.

     *

     * @return a {@code Map} with settings, not {@code null}

     *

     * @see Configuration#getSettings()

     */

    public Map<String, String> getSettings() {

        return settings;

    }

    /**

     * Returns the human-readable name (for example, {@code "Continuous"} or {@code "Profiling"}) for

     * the configuration associated with this {@code ConfigurationInfo}

     *

     * @return the label, or {@code null} if doesn't exist

     *

     * @see Configuration#getLabel()

     */

    public String getLabel() {

        return label;

    }

    /**

     * Returns the name of the configuration associated with this

     * {@code ConfigurationInfo} (for example, {@code "default"}).

     *

     * @return the name, or {@code null} if doesn't exist

     *

     * @see Configuration#getLabel()

     */

    public String getName() {

        return name;

    }

    /**

     * Returns a short sentence that describes the configuration associated with

     * this {@code ConfigurationInfo} (for example, {@code "Low

     * overhead configuration safe for continuous use in production

     * environments"}.

     *

     * @return the description, or {@code null} if doesn't exist

     */

    public String getDescription() {

        return description;

    }

    /**

     * Returns a {@code ConfigurationInfo} object represented by the specified

     * {@code CompositeData}.

     * <p>

     * The following table shows the required attributes that the specified {@code CompositeData} must contain.

     * <blockquote>

     * <table class="striped">

     * <caption>Required names and types for CompositeData</caption>

     * <thead>

     * <tr>

     * <th scope="col" style="text-align:left">Name</th>

     * <th scope="col" style="text-align:left">Type</th>

     * </tr>

     * </thead>

     * <tbody>

     * <tr>

     * <th scope="row">name</th>

     * <td>{@code String}</td>

     * </tr>

     * <tr>

     * <th scope="row">label</th>

     * <td>{@code String}</td>

     * </tr>

     * <tr>

     * <th scope="row">description</th>

     * <td>{@code String}</td>

     * </tr>

     * <tr>

     * <th scope="row">provider</th>

     * <td>{@code String}</td>

     * </tr>

     * <tr>

     * <th scope="row">contents</th>

     * <td>{@code String}</td>

     * </tr>

     *

     * <tr>

     * <th scope="row">settings</th>

     * <td>{@code javax.management.openmbean.TabularData} with a

     * {@code TabularType} with the keys {@code "key"} and {@code "value"}, both

     * of the {@code String} type</td>

     * </tr>

     * </tbody>

     * </table>

     * </blockquote>

     *

     * @param cd {@code CompositeData} representing a {@code ConfigurationInfo}

     *

     * @throws IllegalArgumentException if {@code cd} does not represent a

     *         {@code ConfigurationInfo} with the required attributes

     *

     * @return a {@code ConfigurationInfo} object represented by {@code cd} if

     *         {@code cd} is not {@code null}, {@code null} otherwise

     */

    public static ConfigurationInfo from(CompositeData cd) {

        if (cd == null) {

            return null;

        }

        return new ConfigurationInfo(cd);

    }

    /**

     * Returns a description of the configuration that is associated with this

     * {@code ConfigurationInfo}.

     *

     * @return the description of the configuration, not {@code null}

     */

    @Override

    public String toString() {

        Stringifier s = new Stringifier();

        s.add("name", name);

        s.add("label", label);

        s.add("description", description);

        s.add("provider", provider);

        return s.toString();

    }

}