/*

 * Copyright (c) 1999, 2008, 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 javax.management;

import com.sun.jmx.mbeanserver.GetPropertyAction;

import com.sun.jmx.mbeanserver.Util;

import java.io.IOException;

import java.io.InvalidObjectException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.ObjectStreamField;

import java.security.AccessController;

import java.util.Arrays;

import java.util.Collections;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.Map;

/**

 * <p>Represents the object name of an MBean, or a pattern that can

 * match the names of several MBeans.  Instances of this class are

 * immutable.</p>

 *

 * <p>An instance of this class can be used to represent:</p>

 * <ul>

 * <li>An object name</li>

 * <li>An object name pattern, within the context of a query</li>

 * </ul>

 *

 * <p>An object name consists of two parts, the domain and the key

 * properties.</p>

 *

 * <p>The <em>domain</em> is a string of characters not including

 * the character colon (<code>:</code>).  It is recommended that the domain

 * should not contain the string "{@code //}", which is reserved for future use.

 *

 * <p>If the domain includes at least one occurrence of the wildcard

 * characters asterisk (<code>*</code>) or question mark

 * (<code>?</code>), then the object name is a pattern.  The asterisk

 * matches any sequence of zero or more characters, while the question

 * mark matches any single character.</p>

 *

 * <p>If the domain is empty, it will be replaced in certain contexts

 * by the <em>default domain</em> of the MBean server in which the

 * ObjectName is used.</p>

 *

 * <p>The <em>key properties</em> are an unordered set of keys and

 * associated values.</p>

 *

 * <p>Each <em>key</em> is a nonempty string of characters which may

 * not contain any of the characters comma (<code>,</code>), equals

 * (<code>=</code>), colon, asterisk, or question mark.  The same key

 * may not occur twice in a given ObjectName.</p>

 *

 * <p>Each <em>value</em> associated with a key is a string of

 * characters that is either unquoted or quoted.</p>

 *

 * <p>An <em>unquoted value</em> is a possibly empty string of

 * characters which may not contain any of the characters comma,

 * equals, colon, or quote.</p>

 *

 * <p>If the <em>unquoted value</em> contains at least one occurrence

 * of the wildcard characters asterisk or question mark, then the object

 * name is a <em>property value pattern</em>. The asterisk matches any

 * sequence of zero or more characters, while the question mark matches

 * any single character.</p>

 *

 * <p>A <em>quoted value</em> consists of a quote (<code>"</code>),

 * followed by a possibly empty string of characters, followed by

 * another quote.  Within the string of characters, the backslash

 * (<code>\</code>) has a special meaning.  It must be followed by

 * one of the following characters:</p>

 *

 * <ul>

 * <li>Another backslash.  The second backslash has no special

 * meaning and the two characters represent a single backslash.</li>

 *

 * <li>The character 'n'.  The two characters represent a newline

 * ('\n' in Java).</li>

 *

 * <li>A quote.  The two characters represent a quote, and that quote

 * is not considered to terminate the quoted value. An ending closing

 * quote must be present for the quoted value to be valid.</li>

 *

 * <li>A question mark (?) or asterisk (*).  The two characters represent

 * a question mark or asterisk respectively.</li>

 * </ul>

 *

 * <p>A quote may not appear inside a quoted value except immediately

 * after an odd number of consecutive backslashes.</p>

 *

 * <p>The quotes surrounding a quoted value, and any backslashes

 * within that value, are considered to be part of the value.</p>

 *

 * <p>If the <em>quoted value</em> contains at least one occurrence of

 * the characters asterisk or question mark and they are not preceded

 * by a backslash, then they are considered as wildcard characters and

 * the object name is a <em>property value pattern</em>. The asterisk

 * matches any sequence of zero or more characters, while the question

 * mark matches any single character.</p>

 *

 * <p>An ObjectName may be a <em>property list pattern</em>. In this

 * case it may have zero or more keys and associated values. It matches

 * a nonpattern ObjectName whose domain matches and that contains the

 * same keys and associated values, as well as possibly other keys and

 * values.</p>

 *

 * <p>An ObjectName is a <em>property value pattern</em> when at least

 * one of its <em>quoted</em> or <em>unquoted</em> key property values

 * contains the wildcard characters asterisk or question mark as described

 * above. In this case it has one or more keys and associated values, with

 * at least one of the values containing wildcard characters. It matches a

 * nonpattern ObjectName whose domain matches and that contains the same

 * keys whose values match; if the property value pattern is also a

 * property list pattern then the nonpattern ObjectName can contain

 * other keys and values.</p>

 *

 * <p>An ObjectName is a <em>property pattern</em> if it is either a

 * <em>property list pattern</em> or a <em>property value pattern</em>

 * or both.</p>

 *

 * <p>An ObjectName is a pattern if its domain contains a wildcard or

 * if the ObjectName is a property pattern.</p>

 *

 * <p>If an ObjectName is not a pattern, it must contain at least one

 * key with its associated value.</p>

 *

 * <p>Examples of ObjectName patterns are:</p>

 *

 * <ul>

 * <li>{@code *:type=Foo,name=Bar} to match names in any domain whose

 *     exact set of keys is {@code type=Foo,name=Bar}.</li>

 * <li>{@code d:type=Foo,name=Bar,*} to match names in the domain

 *     {@code d} that have the keys {@code type=Foo,name=Bar} plus

 *     zero or more other keys.</li>

 * <li>{@code *:type=Foo,name=Bar,*} to match names in any domain

 *     that has the keys {@code type=Foo,name=Bar} plus zero or

 *     more other keys.</li>

 * <li>{@code d:type=F?o,name=Bar} will match e.g.

 *     {@code d:type=Foo,name=Bar} and {@code d:type=Fro,name=Bar}.</li>

 * <li>{@code d:type=F*o,name=Bar} will match e.g.

 *     {@code d:type=Fo,name=Bar} and {@code d:type=Frodo,name=Bar}.</li>

 * <li>{@code d:type=Foo,name="B*"} will match e.g.

 *     {@code d:type=Foo,name="Bling"}. Wildcards are recognized even

 *     inside quotes, and like other special characters can be escaped

 *     with {@code \}.</li>

 * </ul>

 *

 * <p>An ObjectName can be written as a String with the following

 * elements in order:</p>

 *

 * <ul>

 * <li>The domain.

 * <li>A colon (<code>:</code>).

 * <li>A key property list as defined below.

 * </ul>

 *

 * <p>A key property list written as a String is a comma-separated

 * list of elements.  Each element is either an asterisk or a key

 * property.  A key property consists of a key, an equals

 * (<code>=</code>), and the associated value.</p>

 *

 * <p>At most one element of a key property list may be an asterisk.

 * If the key property list contains an asterisk element, the

 * ObjectName is a property list pattern.</p>

 *

 * <p>Spaces have no special significance in a String representing an

 * ObjectName.  For example, the String:

 * <pre>

 * domain: key1 = value1 , key2 = value2

 * </pre>

 * represents an ObjectName with two keys.  The name of each key

 * contains six characters, of which the first and last are spaces.

 * The value associated with the key <code>"&nbsp;key1&nbsp;"</code>

 *

 * <p>In addition to the restrictions on characters spelt out above,

 * no part of an ObjectName may contain a newline character

 * (<code>'\n'</code>), whether the domain, a key, or a value, whether

 * quoted or unquoted.  The newline character can be represented in a

 * quoted value with the sequence <code>\n</code>.

 *

 * <p>The rules on special characters and quoting apply regardless of

 * which constructor is used to make an ObjectName.</p>

 *

 * <p>To avoid collisions between MBeans supplied by different

 * vendors, a useful convention is to begin the domain name with the

 * reverse DNS name of the organization that specifies the MBeans,

 * followed by a period and a string whose interpretation is

 * determined by that organization.  For example, MBeans specified by

 * <code>example.com</code>  would have

 * domains such as <code>com.example.MyDomain</code>.  This is essentially

 * the same convention as for Java-language package names.</p>

 *

 * <p>The <b>serialVersionUID</b> of this class is <code>1081892073854801359L</code>.

 *

 * @since 1.5

 */

@SuppressWarnings("serial") // don't complain serialVersionUID not constant

public class ObjectName implements Comparable<ObjectName>, QueryExp {

    /**

     * A structure recording property structure and

     * proposing minimal services

     */

    private static class Property {

        int _key_index;

        int _key_length;

        int _value_length;

        /**

         * Constructor.

         */

        Property(int key_index, int key_length, int value_length) {

            _key_index = key_index;

            _key_length = key_length;

            _value_length = value_length;

        }

        /**

         * Assigns the key index of property

         */

        void setKeyIndex(int key_index) {

            _key_index = key_index;

        }

        /**

         * Returns a key string for receiver key

         */

        String getKeyString(String name) {

            return name.substring(_key_index, _key_index + _key_length);

        }

        /**

         * Returns a value string for receiver key

         */

        String getValueString(String name) {

            int in_begin = _key_index + _key_length + 1;

            int out_end = in_begin + _value_length;

            return name.substring(in_begin, out_end);

        }

    }

    /**

     * Marker class for value pattern property.

     */

    private static class PatternProperty extends Property {

        /**

         * Constructor.

         */

        PatternProperty(int key_index, int key_length, int value_length) {

            super(key_index, key_length, value_length);

        }

    }

    // Inner classes <========================================

    // Private fields ---------------------------------------->

    // Serialization compatibility stuff -------------------->

    // Two serial forms are supported in this class. The selected form depends

    // on system property "jmx.serial.form":

    //  - "1.0" for JMX 1.0

    //  - any other value for JMX 1.1 and higher

    //

    // Serial version for old serial form

    private static final long oldSerialVersionUID = -5467795090068647408L;

    //

    // Serial version for new serial form

    private static final long newSerialVersionUID = 1081892073854801359L;

    //

    // Serializable fields in old serial form

    private static final ObjectStreamField[] oldSerialPersistentFields =

    {

        new ObjectStreamField("domain", String.class),

        new ObjectStreamField("propertyList", Hashtable.class),

        new ObjectStreamField("propertyListString", String.class),

        new ObjectStreamField("canonicalName", String.class),

        new ObjectStreamField("pattern", Boolean.TYPE),

        new ObjectStreamField("propertyPattern", Boolean.TYPE)

    };

    //

    // Serializable fields in new serial form

    private static final ObjectStreamField[] newSerialPersistentFields = { };

    //

    // Actual serial version and serial form

    private static final long serialVersionUID;

    private static final ObjectStreamField[] serialPersistentFields;

    private static boolean compat = false;

    static {

        try {

            GetPropertyAction act = new GetPropertyAction("jmx.serial.form");

            String form = AccessController.doPrivileged(act);

            compat = (form != null && form.equals("1.0"));

        } catch (Exception e) {

            // OK: exception means no compat with 1.0, too bad

        }

        if (compat) {

            serialPersistentFields = oldSerialPersistentFields;

            serialVersionUID = oldSerialVersionUID;

        } else {

            serialPersistentFields = newSerialPersistentFields;

            serialVersionUID = newSerialVersionUID;

        }

    }

    //

    // Serialization compatibility stuff <==============================

    // Class private fields ----------------------------------->

    /**

     * a shared empty array for empty property lists

     */

    static final private Property[] _Empty_property_array = new Property[0];

    // Class private fields <==============================

    // Instance private fields ----------------------------------->

    /**

     * a String containing the canonical name

     */

    private transient String _canonicalName;

    /**

     * An array of properties in the same seq order as time creation

     */

    private transient Property[] _kp_array;

    /**

     * An array of properties in the same seq order as canonical order

     */

    private transient Property[] _ca_array;

    /**

     * The length of the domain part of built objectname

     */

    private transient int _domain_length = 0;

    /**

     * The propertyList of built object name. Initialized lazily.

     * Table that contains all the pairs (key,value) for this ObjectName.

     */

    private transient Map<String,String> _propertyList;

    /**

     * boolean that declares if this ObjectName domain part is a pattern

     */

    private transient boolean _domain_pattern = false;

    /**

     * boolean that declares if this ObjectName contains a pattern on the

     * key property list

     */

    private transient boolean _property_list_pattern = false;

    /**

     * boolean that declares if this ObjectName contains a pattern on the

     * value of at least one key property

     */

    private transient boolean _property_value_pattern = false;

    // Instance private fields <=======================================

    // Private fields <========================================

    //  Private methods ---------------------------------------->

    // Category : Instance construction ------------------------->

    /**

     * Initializes this {@link ObjectName} from the given string

     * representation.

     *

     * @param name A string representation of the {@link ObjectName}

     *

     * @exception MalformedObjectNameException The string passed as a

     * parameter does not have the right format.

     * @exception NullPointerException The <code>name</code> parameter

     * is null.

     */

    private void construct(String name)

        throws MalformedObjectNameException {

        // The name cannot be null

        if (name == null)

            throw new NullPointerException("name cannot be null");

        // Test if the name is empty

        if (name.length() == 0) {

            // this is equivalent to the whole word query object name.

            _canonicalName = "*:*";

            _kp_array = _Empty_property_array;

            _ca_array = _Empty_property_array;

            _domain_length = 1;

            _propertyList = null;

            _domain_pattern = true;

            _property_list_pattern = true;

            _property_value_pattern = false;

            return;

        }

        // initialize parsing of the string

        final char[] name_chars = name.toCharArray();

        final int len = name_chars.length;

        final char[] canonical_chars = new char[len]; // canonical form will

                                                      // be same length at most

        int cname_index = 0;

        int index = 0;

        char c, c1;

        // parses domain part

    domain_parsing:

        while (index < len) {

            switch (name_chars[index]) {

                case ':' :

                    _domain_length = index++;

                    break domain_parsing;

                case '=' :

                    // ":" omission check.

                    //

                    // Although "=" is a valid character in the domain part

                    // it is true that it is rarely used in the real world.

                    // So check straight away if the ":" has been omitted

                    // from the ObjectName. This allows us to provide a more

                    // accurate exception message.

                    int i = ++index;

                    while ((i < len) && (name_chars[i++] != ':'))

                        if (i == len)

                            throw new MalformedObjectNameException(

                                "Domain part must be specified");

                    break;

                case '\n' :

                    throw new MalformedObjectNameException(

                              "Invalid character '\\n' in domain name");

                case '*' :

                case '?' :

                    _domain_pattern = true;

                    index++;

                    break;

                default :

                    index++;

                    break;

            }

        }

        // check for non-empty properties

        if (index == len)

            throw new MalformedObjectNameException(

                                         "Key properties cannot be empty");

        // we have got the domain part, begins building of _canonicalName

        System.arraycopy(name_chars, 0, canonical_chars, 0, _domain_length);

        canonical_chars[_domain_length] = ':';

        cname_index = _domain_length + 1;

        // parses property list

        Property prop;

        Map<String,Property> keys_map = new HashMap<String,Property>();

        String[] keys;

        String key_name;

        boolean quoted_value;

        int property_index = 0;

        int in_index;

        int key_index, key_length, value_index, value_length;

        keys = new String[10];

        _kp_array = new Property[10];

        _property_list_pattern = false;

        _property_value_pattern = false;

        while (index < len) {

            c = name_chars[index];

            // case of pattern properties

            if (c == '*') {

                if (_property_list_pattern)

                    throw new MalformedObjectNameException(

                              "Cannot have several '*' characters in pattern " +

                              "property list");

                else {

                    _property_list_pattern = true;

                    if ((++index < len ) && (name_chars[index] != ','))

                        throw new MalformedObjectNameException(

                                  "Invalid character found after '*': end of " +

                                  "name or ',' expected");

                    else if (index == len) {

                        if (property_index == 0) {

                            // empty properties case

                            _kp_array = _Empty_property_array;

                            _ca_array = _Empty_property_array;