/*

 * Copyright (c) 2000, 2017, 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.

 */

/*

 * @author    IBM Corp.

 *

 * Copyright IBM Corp. 1999-2000.  All rights reserved.

 */

package javax.management.modelmbean;

import static com.sun.jmx.defaults.JmxProperties.MODELMBEAN_LOGGER;

import com.sun.jmx.mbeanserver.GetPropertyAction;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.ObjectStreamField;

import java.lang.reflect.Constructor;

import java.security.AccessController;

import java.lang.System.Logger.Level;

import javax.management.Descriptor;

import javax.management.DescriptorAccess;

import javax.management.DescriptorKey;

import javax.management.MBeanConstructorInfo;

import javax.management.MBeanParameterInfo;

import javax.management.RuntimeOperationsException;

/**

 * <p>The ModelMBeanConstructorInfo object describes a constructor of the ModelMBean.

 * It is a subclass of MBeanConstructorInfo with the addition of an associated Descriptor

 * and an implementation of the DescriptorAccess interface.</p>

 *

 * <P id="descriptor">

 * The fields in the descriptor are defined, but not limited to, the following.

 * Note that when the Type in this table is Number, a String that is the decimal

 * representation of a Long can also be used.</P>

 *

 * <table class="striped">

 * <caption style="display:none">ModelMBeanConstructorInfo Fields</caption>

 * <thead>

 * <tr><th scope="col">Name</th><th scope="col">Type</th><th scope="col">Meaning</th></tr>

 * </thead>

 * <tbody style="text-align:left">

 * <tr><th scope="row">name</th><td>String</td>

 *     <td>Constructor name.</td></tr>

 * <tr><th scope="row">descriptorType</th><td>String</td>

 *     <td>Must be "operation".</td></tr>

 * <tr><th scope="row">role</th><td>String</td>

 *     <td>Must be "constructor".</td></tr>

 * <tr><th scope="row">displayName</th><td>String</td>

 *     <td>Human readable name of constructor.</td></tr>

 * <tr><th scope="row">visibility</th><td>Number</td>

 *     <td>1-4 where 1: always visible 4: rarely visible.</td></tr>

 * <tr><th scope="row">presentationString</th><td>String</td>

 *     <td>XML formatted string to describe how to present operation</td></tr>

 * </tbody>

 * </table>

 *

 * <p>The {@code persistPolicy} and {@code currencyTimeLimit} fields

 * are meaningless for constructors, but are not considered invalid.</p>

 *

 * <p>The default descriptor will have the {@code name}, {@code

 * descriptorType}, {@code displayName} and {@code role} fields.

 *

 * <p>The <b>serialVersionUID</b> of this class is <code>3862947819818064362L</code>.

 *

 * @since 1.5

 */

@SuppressWarnings("serial")  // serialVersionUID is not constant

public class ModelMBeanConstructorInfo

    extends MBeanConstructorInfo

    implements DescriptorAccess {

    // 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 = -4440125391095574518L;

    //

    // Serial version for new serial form

    private static final long newSerialVersionUID = 3862947819818064362L;

    //

    // Serializable fields in old serial form

    private static final ObjectStreamField[] oldSerialPersistentFields =

    {

      new ObjectStreamField("consDescriptor", Descriptor.class),

      new ObjectStreamField("currClass", String.class)

    };

    //

    // Serializable fields in new serial form

    private static final ObjectStreamField[] newSerialPersistentFields =

    {

      new ObjectStreamField("consDescriptor", Descriptor.class)

    };

    //

    // Actual serial version and serial form

    private static final long serialVersionUID;

    /**

     * @serialField consDescriptor Descriptor The {@link Descriptor} containing the metadata for this instance

     */

    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: No compat with 1.0

        }

        if (compat) {

            serialPersistentFields = oldSerialPersistentFields;

            serialVersionUID = oldSerialVersionUID;

        } else {

            serialPersistentFields = newSerialPersistentFields;

            serialVersionUID = newSerialVersionUID;

        }

    }

    //

    // END Serialization compatibility stuff

        /**

         * @serial The {@link Descriptor} containing the metadata for this instance

         */

        private Descriptor consDescriptor = validDescriptor(null);

        private final static String currClass = "ModelMBeanConstructorInfo";

        /**

        * Constructs a ModelMBeanConstructorInfo object with a default

        * descriptor.  The {@link Descriptor} of the constructed

        * object will include fields contributed by any annotations on

        * the {@code Constructor} object that contain the {@link

        * DescriptorKey} meta-annotation.

        *

        * @param description A human readable description of the constructor.

        * @param constructorMethod The java.lang.reflect.Constructor object

        * describing the MBean constructor.

        */

        public ModelMBeanConstructorInfo(String description,

                                         Constructor<?> constructorMethod)

    {

                super(description, constructorMethod);

                if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                    MODELMBEAN_LOGGER.log(Level.TRACE,

                            "ModelMBeanConstructorInfo(String,Constructor) " +

                            "Entry");

                }

                consDescriptor = validDescriptor(null);

                // put getter and setter methods in constructors list

                // create default descriptor

        }

        /**

        * Constructs a ModelMBeanConstructorInfo object.  The {@link

        * Descriptor} of the constructed object will include fields

        * contributed by any annotations on the {@code Constructor}

        * object that contain the {@link DescriptorKey}

        * meta-annotation.

        *

        * @param description A human readable description of the constructor.

        * @param constructorMethod The java.lang.reflect.Constructor object

        * describing the ModelMBean constructor.

        * @param descriptor An instance of Descriptor containing the

        * appropriate metadata for this instance of the

        * ModelMBeanConstructorInfo.  If it is null, then a default

        * descriptor will be created. If the descriptor does not

        * contain the field "displayName" this field is added in the

        * descriptor with its default value.

        *

        * @exception RuntimeOperationsException Wraps an

        * IllegalArgumentException. The descriptor is invalid, or

        * descriptor field "name" is not equal to name

        * parameter, or descriptor field "descriptorType" is

        * not equal to "operation" or descriptor field "role" is

        * present but not equal to "constructor".

        */

        public ModelMBeanConstructorInfo(String description,

                                         Constructor<?> constructorMethod,

                                         Descriptor descriptor)

        {

                super(description, constructorMethod);

                // put getter and setter methods in constructors list

                if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                    MODELMBEAN_LOGGER.log(Level.TRACE,

                            "ModelMBeanConstructorInfo(" +

                            "String,Constructor,Descriptor) Entry");

                }

                consDescriptor = validDescriptor(descriptor);

        }

        /**

        * Constructs a ModelMBeanConstructorInfo object with a default descriptor.

        *

        * @param name The name of the constructor.

        * @param description A human readable description of the constructor.

        * @param signature MBeanParameterInfo object array describing the parameters(arguments) of the constructor.

        */

        public ModelMBeanConstructorInfo(String name,

                                         String description,

                                         MBeanParameterInfo[] signature)

        {

                super(name, description, signature);

                // create default descriptor

                if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                    MODELMBEAN_LOGGER.log(Level.TRACE,

                            "ModelMBeanConstructorInfo(" +

                            "String,String,MBeanParameterInfo[]) Entry");

                }

                consDescriptor = validDescriptor(null);

        }

        /**

        * Constructs a ModelMBeanConstructorInfo object.

        *

        * @param name The name of the constructor.

        * @param description A human readable description of the constructor.

        * @param signature MBeanParameterInfo objects describing the parameters(arguments) of the constructor.

        * @param descriptor An instance of Descriptor containing the appropriate metadata

        *                   for this instance of the MBeanConstructorInfo. If it is null then a default descriptor will be created.

        * If the descriptor does not contain the field "displayName" this field

        * is added in the descriptor with its default value.

        *

        * @exception RuntimeOperationsException Wraps an

        * IllegalArgumentException. The descriptor is invalid, or

        * descriptor field "name" is not equal to name

        * parameter, or descriptor field "descriptorType" is

        * not equal to "operation" or descriptor field "role" is

        * present but not equal to "constructor".

        */

        public ModelMBeanConstructorInfo(String name,

                                         String description,

                                         MBeanParameterInfo[] signature,

                                         Descriptor descriptor)

        {

                super(name, description, signature);

                if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                    MODELMBEAN_LOGGER.log(Level.TRACE,

                            "ModelMBeanConstructorInfo(" +

                            "String,String,MBeanParameterInfo[],Descriptor) " +

                            "Entry");

                }

                consDescriptor = validDescriptor(descriptor);

        }

        /**

         * Constructs a new ModelMBeanConstructorInfo object from this ModelMBeanConstructor Object.

         *

         * @param old the ModelMBeanConstructorInfo to be duplicated

         *

         */

        ModelMBeanConstructorInfo(ModelMBeanConstructorInfo old)

        {

                super(old.getName(), old.getDescription(), old.getSignature());

                if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                    MODELMBEAN_LOGGER.log(Level.TRACE,

                            "ModelMBeanConstructorInfo(" +

                            "ModelMBeanConstructorInfo) Entry");

                }

                consDescriptor = validDescriptor(consDescriptor);

        }

        /**

        * Creates and returns a new ModelMBeanConstructorInfo which is a duplicate of this ModelMBeanConstructorInfo.

        *

        */

        @Override

        public Object clone ()

        {

            if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                MODELMBEAN_LOGGER.log(Level.TRACE, "Entry");

            }

                return(new ModelMBeanConstructorInfo(this)) ;

        }

        /**

         * Returns a copy of the associated Descriptor.

         *

         * @return Descriptor associated with the

         * ModelMBeanConstructorInfo object.

         *

         * @see #setDescriptor

         */

        @Override

        public Descriptor getDescriptor()

        {

            if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                MODELMBEAN_LOGGER.log(Level.TRACE, "Entry");

            }

            if (consDescriptor == null){

                consDescriptor = validDescriptor(null);

            }

            return((Descriptor)consDescriptor.clone());

        }

        /**

        * Sets associated Descriptor (full replace) of

        * ModelMBeanConstructorInfo.  If the new Descriptor is null,

        * then the associated Descriptor reverts to a default

        * descriptor.  The Descriptor is validated before it is

        * assigned.  If the new Descriptor is invalid, then a

        * RuntimeOperationsException wrapping an

        * IllegalArgumentException is thrown.

        *

        * @param inDescriptor replaces the Descriptor associated with

        * the ModelMBeanConstructor. If the descriptor does not

        * contain all the following fields, the missing ones are added with

        * their default values: displayName, name, role, descriptorType.

        *

        * @exception RuntimeOperationsException Wraps an

        * IllegalArgumentException.  The descriptor is invalid, or

        * descriptor field "name" is present but not equal to name

        * parameter, or descriptor field "descriptorType" is present

        * but not equal to "operation" or descriptor field "role" is

        * present but not equal to "constructor".

        *

        * @see #getDescriptor

        */

        public void setDescriptor(Descriptor inDescriptor)

        {

            if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                MODELMBEAN_LOGGER.log(Level.TRACE, "Entry");

            }

            consDescriptor = validDescriptor(inDescriptor);

        }

        /**

        * Returns a string containing the entire contents of the ModelMBeanConstructorInfo in human readable form.

        */

        @Override

        public String toString()

        {

            if (MODELMBEAN_LOGGER.isLoggable(Level.TRACE)) {

                MODELMBEAN_LOGGER.log(Level.TRACE, "Entry");

            }

                String retStr =

                    "ModelMBeanConstructorInfo: " + this.getName() +

                    " ; Description: " + this.getDescription() +

                    " ; Descriptor: " + this.getDescriptor() +

                    " ; Signature: ";

                MBeanParameterInfo[] pTypes = this.getSignature();

                for (int i=0; i < pTypes.length; i++)

                {

                        retStr = retStr.concat((pTypes[i]).getType() + ", ");

                }

                return retStr;

        }

        /**

         * Clones the passed in Descriptor, sets default values, and checks for validity.

         * If the Descriptor is invalid (for instance by having the wrong "name"),

         * this indicates programming error and a RuntimeOperationsException will be thrown.

         *

         * The following fields will be defaulted if they are not already set:

         * displayName=this.getName(), name=this.getName(), descriptorType="operation",

         * role="constructor"

         *

         *

         * @param in Descriptor to be checked, or null which is equivalent to

         * an empty Descriptor.

         * @exception RuntimeOperationsException if Descriptor is invalid

         */

        private Descriptor validDescriptor(final Descriptor in) throws RuntimeOperationsException {

            Descriptor clone;

            boolean defaulted = (in == null);

            if (defaulted) {

                clone = new DescriptorSupport();

                MODELMBEAN_LOGGER.log(Level.TRACE, "Null Descriptor, creating new.");

            } else {

                clone = (Descriptor) in.clone();

            }

            //Setting defaults.

            if (defaulted && clone.getFieldValue("name")==null) {

                clone.setField("name", this.getName());

                MODELMBEAN_LOGGER.log(Level.TRACE, "Defaulting Descriptor name to " + this.getName());

            }

            if (defaulted && clone.getFieldValue("descriptorType")==null) {

                clone.setField("descriptorType", "operation");

                MODELMBEAN_LOGGER.log(Level.TRACE, "Defaulting descriptorType to \"operation\"");

            }

            if (clone.getFieldValue("displayName") == null) {

                clone.setField("displayName",this.getName());

                MODELMBEAN_LOGGER.log(Level.TRACE, "Defaulting Descriptor displayName to " + this.getName());

            }

            if (clone.getFieldValue("role") == null) {

                clone.setField("role","constructor");

                MODELMBEAN_LOGGER.log(Level.TRACE, "Defaulting Descriptor role field to \"constructor\"");

            }

            //Checking validity

            if (!clone.isValid()) {

                 throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),

                    "The isValid() method of the Descriptor object itself returned false,"+

                    "one or more required fields are invalid. Descriptor:" + clone.toString());

            }

            if (!getName().equalsIgnoreCase((String) clone.getFieldValue("name"))) {

                    throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),

                    "The Descriptor \"name\" field does not match the object described. " +

                     " Expected: "+ this.getName() + " , was: " + clone.getFieldValue("name"));

            }

            if (!"operation".equalsIgnoreCase((String) clone.getFieldValue("descriptorType"))) {

                     throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),

                    "The Descriptor \"descriptorType\" field does not match the object described. " +

                     " Expected: \"operation\" ," + " was: " + clone.getFieldValue("descriptorType"));

            }

            if (! ((String)clone.getFieldValue("role")).equalsIgnoreCase("constructor")) {

                     throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),

                    "The Descriptor \"role\" field does not match the object described. " +

                     " Expected: \"constructor\" ," + " was: " + clone.getFieldValue("role"));

            }

            return clone;

        }

    /**

     * Deserializes a {@link ModelMBeanConstructorInfo} from an {@link ObjectInputStream}.

     */

    private void readObject(ObjectInputStream in)

            throws IOException, ClassNotFoundException {

      // New serial form ignores extra field "currClass"

      in.defaultReadObject();

    }

    /**

     * Serializes a {@link ModelMBeanConstructorInfo} to an {@link ObjectOutputStream}.

     */

    private void writeObject(ObjectOutputStream out)

            throws IOException {

      if (compat)

      {

        // Serializes this instance in the old serial form

        //

        ObjectOutputStream.PutField fields = out.putFields();

        fields.put("consDescriptor", consDescriptor);

        fields.put("currClass", currClass);

        out.writeFields();

      }

      else

      {

        // Serializes this instance in the new serial form

        //

        out.defaultWriteObject();

      }

    }

}