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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.phloc.commons.jmx;

import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import javax.management.JMException;
import javax.management.ObjectName;

import com.phloc.commons.ValueEnforcer;
import com.phloc.commons.annotations.Nonempty;
import com.phloc.commons.annotations.PresentForCodeCoverage;
import com.phloc.commons.exceptions.LoggedRuntimeException;
import com.phloc.commons.lang.CGStringHelper;

/**
 * Utility class to create JMX {@link ObjectName} objects.
 * 
 * @author Philip Helger
 */
@Immutable
public final class ObjectNameUtils
{
  @SuppressWarnings ("unused")
  @PresentForCodeCoverage
  private static final ObjectNameUtils s_aInstance = new ObjectNameUtils ();

  private static final ReadWriteLock s_aRWLock = new ReentrantReadWriteLock ();
  private static String s_sDefaultJMXDomain = CJMX.PHLOC_JMX_DOMAIN;

  private ObjectNameUtils ()
  {}

  /**
   * Set the default JMX domain
   * 
   * @param sDefaultJMXDomain
   *        The new JMX domain. May neither be null nor empty nor
   *        may it contains ":" or " "
   */
  public static void setDefaultJMXDomain (@Nonnull @Nonempty final String sDefaultJMXDomain)
  {
    ValueEnforcer.notEmpty (sDefaultJMXDomain, "DefaultJMXDomain");
    if (sDefaultJMXDomain.indexOf (':') >= 0 || sDefaultJMXDomain.indexOf (' ') >= 0)
      throw new IllegalArgumentException ("defaultJMXDomain contains invalid chars: " + sDefaultJMXDomain);

    s_aRWLock.writeLock ().lock ();
    try
    {
      s_sDefaultJMXDomain = sDefaultJMXDomain;
    }
    finally
    {
      s_aRWLock.writeLock ().unlock ();
    }
  }

  /**
   * @return The default JMX domain to be used for {@link ObjectName} instances.
   *         The default value is {@link CJMX#PHLOC_JMX_DOMAIN}.
   */
  @Nonnull
  @Nonempty
  public static String getDefaultJMXDomain ()
  {
    s_aRWLock.readLock ().lock ();
    try
    {
      return s_sDefaultJMXDomain;
    }
    finally
    {
      s_aRWLock.readLock ().unlock ();
    }
  }

  @Nonnull
  public static ObjectName create (@Nonnull @Nonempty final Hashtable  aParams)
  {
    ValueEnforcer.notEmpty (aParams, "Params");

    try
    {
      return new ObjectName (getDefaultJMXDomain (), aParams);
    }
    catch (final JMException ex)
    {
      throw LoggedRuntimeException.newException ("Failed to create ObjectName with parameter " + aParams, ex);
    }
  }

  @Nonnull
  public static ObjectName create (@Nonnull @Nonempty final Map  aParams)
  {
    ValueEnforcer.notEmpty (aParams, "Params");

    return create (new Hashtable  (aParams));
  }

  /**
   * Create a clean property value applicable for an {@link ObjectName} property
   * value by replacing the special chars ":" and "," with "." and "//" with
   * "__". If the input value contains a blank, the quotes value is returned.
   * 
   * @param sPropertyValue
   *        The original property value. May not be null.
   * @return The modified property value applicable for {@link ObjectName}.
   * @see ObjectName#quote(String)
   */
  @Nonnull
  public static String getCleanPropertyValue (@Nonnull final String sPropertyValue)
  {
    // If a blank is contained, simply quote it
    if (sPropertyValue.indexOf (' ') != -1)
      return ObjectName.quote (sPropertyValue);

    // ":" is prohibited
    // "," is the property separator
    // "//" is according to the specs reserved for future use
    return sPropertyValue.replace (':', '.').replace (',', '.').replace ("//", "__");
  }

  /**
   * Create a standard {@link ObjectName} using the default domain and only the
   * "type" property. The type property is the class local name of the specified
   * object.
   * 
   * @param aObj
   *        The object from which the name is to be created.
   * @return The non-null {@link ObjectName}.
   */
  @Nonnull
  public static ObjectName createWithDefaultProperties (@Nonnull final Object aObj)
  {
    ValueEnforcer.notNull (aObj, "Object");

    final Hashtable  aParams = new Hashtable  ();
    aParams.put (CJMX.PROPERTY_TYPE, CGStringHelper.getClassLocalName (aObj));
    return create (aParams);
  }

  /**
   * Create a standard {@link ObjectName} using the default domain and the
   * "type" and "name" properties. The type property is the class local name of
   * the specified object.
   * 
   * @param aObj
   *        The object from which the name is to be created.
   * @param sName
   *        The value of the "name" JMX property
   * @return The non-null {@link ObjectName}.
   */
  @Nonnull
  public static ObjectName createWithDefaultProperties (@Nonnull final Object aObj, @Nonnull final String sName)
  {
    ValueEnforcer.notNull (aObj, "Object");
    ValueEnforcer.notNull (sName, "Name");

    final Hashtable  aParams = new Hashtable  ();
    aParams.put (CJMX.PROPERTY_TYPE, CGStringHelper.getClassLocalName (aObj));
    aParams.put (CJMX.PROPERTY_NAME, getCleanPropertyValue (sName));
    return create (aParams);
  }
}