bundles/org.apache.tomcat/src/org/apache/tomcat/util/modeler/modules/MbeansDescriptorsIntrospectionSource.java - rap/org.apache.tomcat - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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 org.apache.tomcat.util.modeler.modules;

 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.Hashtable;
 import java.util.List;

 import javax.management.ObjectName;

 import org.apache.juli.logging.Log;
 import org.apache.juli.logging.LogFactory;
 import org.apache.tomcat.util.modeler.AttributeInfo;
 import org.apache.tomcat.util.modeler.ManagedBean;
 import org.apache.tomcat.util.modeler.OperationInfo;
 import org.apache.tomcat.util.modeler.ParameterInfo;
 import org.apache.tomcat.util.modeler.Registry;

 public class MbeansDescriptorsIntrospectionSource extends ModelerSource
 {
     private static final Log log = LogFactory.getLog(MbeansDescriptorsIntrospectionSource.class);

     Registry registry;
     String location;
     String type;
     Object source;
     List<ObjectName> mbeans = new ArrayList<ObjectName>();

     public void setRegistry(Registry reg) {
         this.registry=reg;
     }

     public void setLocation( String loc ) {
         this.location=loc;
     }

     /** Used if a single component is loaded
      *
      * @param type
      */
     public void setType( String type ) {
        this.type=type;
     }

     public void setSource( Object source ) {
         this.source=source;
     }

     @Override
     public List<ObjectName> loadDescriptors( Registry registry, String location,
             String type, Object source) throws Exception {
         setRegistry(registry);
         setLocation(location);
         setType(type);
         setSource(source);
         execute();
         return mbeans;
     }

     public void execute() throws Exception {
         if( registry==null ) registry=Registry.getRegistry(null, null);
         try {
             ManagedBean managed = createManagedBean(registry, null,
                     (Class<?>)source, type);
             if( managed==null ) return;
             managed.setName( type );

             registry.addManagedBean(managed);

         } catch( Exception ex ) {
             log.error( "Error reading descriptors ", ex);
         }
     }


     // ------------ Implementation for non-declared introspection classes

     static Hashtable<String,String> specialMethods =
         new Hashtable<String,String>();
     static {
         specialMethods.put( "preDeregister", "");
         specialMethods.put( "postDeregister", "");
     }

     private static String strArray[]=new String[0];
     private static ObjectName objNameArray[]=new ObjectName[0];
     // createMBean == registerClass + registerMBean

     private static Class<?>[] supportedTypes  = new Class[] {
         Boolean.class,
         Boolean.TYPE,
         Byte.class,
         Byte.TYPE,
         Character.class,
         Character.TYPE,
         Short.class,
         Short.TYPE,
         Integer.class,
         Integer.TYPE,
         Long.class,
         Long.TYPE,
         Float.class,
         Float.TYPE,
         Double.class,
         Double.TYPE,
         String.class,
         strArray.getClass(),
         BigDecimal.class,
         BigInteger.class,
         ObjectName.class,
         objNameArray.getClass(),
         java.io.File.class,
     };

     /**
      * Check if this class is one of the supported types.
      * If the class is supported, returns true.  Otherwise,
      * returns false.
      * @param ret The class to check
      * @return boolean True if class is supported
      */
     private boolean supportedType(Class<?> ret) {
         for (int i = 0; i < supportedTypes.length; i++) {
             if (ret == supportedTypes[i]) {
                 return true;
             }
         }
         if (isBeanCompatible(ret)) {
             return true;
         }
         return false;
     }

     /**
      * Check if this class conforms to JavaBeans specifications.
      * If the class is conformant, returns true.
      *
      * @param javaType The class to check
      * @return boolean True if the class is compatible.
      */
     protected boolean isBeanCompatible(Class<?> javaType) {
         // Must be a non-primitive and non array
         if (javaType.isArray() || javaType.isPrimitive()) {
             return false;
         }

         // Anything in the java or javax package that
         // does not have a defined mapping is excluded.
         if (javaType.getName().startsWith("java.") ||
             javaType.getName().startsWith("javax.")) {
             return false;
         }

         try {
             javaType.getConstructor(new Class[]{});
         } catch (java.lang.NoSuchMethodException e) {
             return false;
         }

         // Make sure superclass is compatible
         Class<?> superClass = javaType.getSuperclass();
         if (superClass != null &&
             superClass != java.lang.Object.class &&
             superClass != java.lang.Exception.class &&
             superClass != java.lang.Throwable.class) {
             if (!isBeanCompatible(superClass)) {
                 return false;
             }
         }
         return true;
     }

     /**
      * Process the methods and extract 'attributes', methods, etc
      *
      * @param realClass The class to process
      * @param methods The methods to process
      * @param attMap The attribute map (complete)
      * @param getAttMap The readable attributes map
      * @param setAttMap The settable attributes map
      * @param invokeAttMap The invokable attributes map
      */
     private void initMethods(Class<?> realClass,
                              Method methods[],
                              Hashtable<String,Method> attMap,
                              Hashtable<String,Method> getAttMap,
                              Hashtable<String,Method> setAttMap,
                              Hashtable<String,Method> invokeAttMap)
     {
         for (int j = 0; j < methods.length; ++j) {
             String name=methods[j].getName();

             if( Modifier.isStatic(methods[j].getModifiers()))
                 continue;
             if( ! Modifier.isPublic( methods[j].getModifiers() ) ) {
                 if( log.isDebugEnabled())
                     log.debug("Not public " + methods[j] );
                 continue;
             }
             if( methods[j].getDeclaringClass() == Object.class )
                 continue;
             Class<?> params[] = methods[j].getParameterTypes();

             if( name.startsWith( "get" ) && params.length==0) {
                 Class<?> ret = methods[j].getReturnType();
                 if( ! supportedType( ret ) ) {
                     if( log.isDebugEnabled() )
                         log.debug("Unsupported type " + methods[j]);
                     continue;
                 }
                 name=unCapitalize( name.substring(3));

                 getAttMap.put( name, methods[j] );
                 // just a marker, we don't use the value
                 attMap.put( name, methods[j] );
             } else if( name.startsWith( "is" ) && params.length==0) {
                 Class<?> ret = methods[j].getReturnType();
                 if( Boolean.TYPE != ret  ) {
                     if( log.isDebugEnabled() )
                         log.debug("Unsupported type " + methods[j] + " " + ret );
                     continue;
                 }
                 name=unCapitalize( name.substring(2));

                 getAttMap.put( name, methods[j] );
                 // just a marker, we don't use the value
                 attMap.put( name, methods[j] );

             } else if( name.startsWith( "set" ) && params.length==1) {
                 if( ! supportedType( params[0] ) ) {
                     if( log.isDebugEnabled() )
                         log.debug("Unsupported type " + methods[j] + " " + params[0]);
                     continue;
                 }
                 name=unCapitalize( name.substring(3));
                 setAttMap.put( name, methods[j] );
                 attMap.put( name, methods[j] );
             } else {
                 if( params.length == 0 ) {
                     if( specialMethods.get( methods[j].getName() ) != null )
                         continue;
                     invokeAttMap.put( name, methods[j]);
                 } else {
                     boolean supported=true;
                     for( int i=0; i<params.length; i++ ) {
                         if( ! supportedType( params[i])) {
                             supported=false;
                             break;
                         }
                     }
                     if( supported )
                         invokeAttMap.put( name, methods[j]);
                 }
             }
         }
     }

     /**
      * XXX Find if the 'className' is the name of the MBean or
      *       the real class ( I suppose first )
      * XXX Read (optional) descriptions from a .properties, generated
      *       from source
      * XXX Deal with constructors
      *
      * @param registry The Bean registry (not used)
      * @param domain The bean domain (not used)
      * @param realClass The class to analyze
      * @param type The bean type
      * @return ManagedBean The create MBean
      */
     public ManagedBean createManagedBean(Registry registry, String domain,
                                          Class<?> realClass, String type)
     {
         ManagedBean mbean= new ManagedBean();

         Method methods[]=null;

         Hashtable<String,Method> attMap = new Hashtable<String,Method>();
         // key: attribute val: getter method
         Hashtable<String,Method> getAttMap = new Hashtable<String,Method>();
         // key: attribute val: setter method
         Hashtable<String,Method> setAttMap = new Hashtable<String,Method>();
         // key: operation val: invoke method
         Hashtable<String,Method> invokeAttMap = new Hashtable<String,Method>();

         methods = realClass.getMethods();

         initMethods(realClass, methods, attMap, getAttMap, setAttMap, invokeAttMap );

         try {

             Enumeration<String> en = attMap.keys();
             while( en.hasMoreElements() ) {
                 String name = en.nextElement();
                 AttributeInfo ai=new AttributeInfo();
                 ai.setName( name );
                 Method gm = getAttMap.get(name);
                 if( gm!=null ) {
                     //ai.setGetMethodObj( gm );
                     ai.setGetMethod( gm.getName());
                     Class<?> t=gm.getReturnType();
                     if( t!=null )
                         ai.setType( t.getName() );
                 }
                 Method sm = setAttMap.get(name);
                 if( sm!=null ) {
                     //ai.setSetMethodObj(sm);
                     Class<?> t = sm.getParameterTypes()[0];
                     if( t!=null )
                         ai.setType( t.getName());
                     ai.setSetMethod( sm.getName());
                 }
                 ai.setDescription("Introspected attribute " + name);
                 if( log.isDebugEnabled()) log.debug("Introspected attribute " +
                         name + " " + gm + " " + sm);
                 if( gm==null )
                     ai.setReadable(false);
                 if( sm==null )
                     ai.setWriteable(false);
                 if( sm!=null || gm!=null )
                     mbean.addAttribute(ai);
             }

             en=invokeAttMap.keys();
             while( en.hasMoreElements() ) {
                 String name = en.nextElement();
                 Method m = invokeAttMap.get(name);
                 if( m!=null && name != null ) {
                     OperationInfo op=new OperationInfo();
                     op.setName(name);
                     op.setReturnType(m.getReturnType().getName());
                     op.setDescription("Introspected operation " + name);
                     Class<?> parms[] = m.getParameterTypes();
                     for(int i=0; i<parms.length; i++ ) {
                         ParameterInfo pi=new ParameterInfo();
                         pi.setType(parms[i].getName());
                         pi.setName( "param" + i);
                         pi.setDescription("Introspected parameter param" + i);
                         op.addParameter(pi);
                     }
                     mbean.addOperation(op);
                 } else {
                     log.error("Null arg " + name + " " + m );
                 }
             }

             /*Constructor[] constructors = realClass.getConstructors();
             for(int i=0;i<constructors.length;i++) {
                 ConstructorInfo info = new ConstructorInfo();
                 String className = realClass.getName();
                 int nIndex = -1;
                 if((nIndex = className.lastIndexOf('.'))!=-1) {
                     className = className.substring(nIndex+1);
                 }
                 info.setName(className);
                 info.setDescription(constructors[i].getName());
                 Class classes[] = constructors[i].getParameterTypes();
                 for(int j=0;j<classes.length;j++) {
                     ParameterInfo pi = new ParameterInfo();
                     pi.setType(classes[j].getName());
                     pi.setName("param" + j);
                     pi.setDescription("Introspected parameter param" + j);
                     info.addParameter(pi);
                 }
                 mbean.addConstructor(info);
             }
             */

             if( log.isDebugEnabled())
                 log.debug("Setting name: " + type );
             mbean.setName( type );

             return mbean;
         } catch( Exception ex ) {
             ex.printStackTrace();
             return null;
         }
     }


     // -------------------- Utils --------------------
     /**
      * Converts the first character of the given
      * String into lower-case.
      *
      * @param name The string to convert
      * @return String
      */
     private static String unCapitalize(String name) {
         if (name == null || name.length() == 0) {
             return name;
         }
         char chars[] = name.toCharArray();
         chars[0] = Character.toLowerCase(chars[0]);
         return new String(chars);
     }

 }

 // End of class: MbeanDescriptorsIntrospectionSource
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 org.apache.tomcat.util.modeler.modules;

	import java.lang.reflect.Method;
	import java.lang.reflect.Modifier;
	import java.math.BigDecimal;
	import java.math.BigInteger;
	import java.util.ArrayList;
	import java.util.Enumeration;
	import java.util.Hashtable;
	import java.util.List;

	import javax.management.ObjectName;

	import org.apache.juli.logging.Log;
	import org.apache.juli.logging.LogFactory;
	import org.apache.tomcat.util.modeler.AttributeInfo;
	import org.apache.tomcat.util.modeler.ManagedBean;
	import org.apache.tomcat.util.modeler.OperationInfo;
	import org.apache.tomcat.util.modeler.ParameterInfo;
	import org.apache.tomcat.util.modeler.Registry;

	public class MbeansDescriptorsIntrospectionSource extends ModelerSource
	{
	private static final Log log = LogFactory.getLog(MbeansDescriptorsIntrospectionSource.class);

	Registry registry;
	String location;
	String type;
	Object source;
	List<ObjectName> mbeans = new ArrayList<ObjectName>();

	public void setRegistry(Registry reg) {
	this.registry=reg;
	}

	public void setLocation( String loc ) {
	this.location=loc;
	}

	/** Used if a single component is loaded
	*
	* @param type
	*/
	public void setType( String type ) {
	this.type=type;
	}

	public void setSource( Object source ) {
	this.source=source;
	}

	@Override
	public List<ObjectName> loadDescriptors( Registry registry, String location,
	String type, Object source) throws Exception {
	setRegistry(registry);
	setLocation(location);
	setType(type);
	setSource(source);
	execute();
	return mbeans;
	}

	public void execute() throws Exception {
	if( registry==null ) registry=Registry.getRegistry(null, null);
	try {
	ManagedBean managed = createManagedBean(registry, null,
	(Class<?>)source, type);
	if( managed==null ) return;
	managed.setName( type );

	registry.addManagedBean(managed);

	} catch( Exception ex ) {
	log.error( "Error reading descriptors ", ex);
	}
	}



	// ------------ Implementation for non-declared introspection classes

	static Hashtable<String,String> specialMethods =
	new Hashtable<String,String>();
	static {
	specialMethods.put( "preDeregister", "");
	specialMethods.put( "postDeregister", "");
	}

	private static String strArray[]=new String[0];
	private static ObjectName objNameArray[]=new ObjectName[0];
	// createMBean == registerClass + registerMBean

	private static Class<?>[] supportedTypes = new Class[] {
	Boolean.class,
	Boolean.TYPE,
	Byte.class,
	Byte.TYPE,
	Character.class,
	Character.TYPE,
	Short.class,
	Short.TYPE,
	Integer.class,
	Integer.TYPE,
	Long.class,
	Long.TYPE,
	Float.class,
	Float.TYPE,
	Double.class,
	Double.TYPE,
	String.class,
	strArray.getClass(),
	BigDecimal.class,
	BigInteger.class,
	ObjectName.class,
	objNameArray.getClass(),
	java.io.File.class,
	};

	/**
	* Check if this class is one of the supported types.
	* If the class is supported, returns true. Otherwise,
	* returns false.
	* @param ret The class to check
	* @return boolean True if class is supported
	*/
	private boolean supportedType(Class<?> ret) {
	for (int i = 0; i < supportedTypes.length; i++) {
	if (ret == supportedTypes[i]) {
	return true;
	}
	}
	if (isBeanCompatible(ret)) {
	return true;
	}
	return false;
	}

	/**
	* Check if this class conforms to JavaBeans specifications.
	* If the class is conformant, returns true.
	*
	* @param javaType The class to check
	* @return boolean True if the class is compatible.
	*/
	protected boolean isBeanCompatible(Class<?> javaType) {
	// Must be a non-primitive and non array
	if (javaType.isArray() \|\| javaType.isPrimitive()) {
	return false;
	}

	// Anything in the java or javax package that
	// does not have a defined mapping is excluded.
	if (javaType.getName().startsWith("java.") \|\|
	javaType.getName().startsWith("javax.")) {
	return false;
	}

	try {
	javaType.getConstructor(new Class[]{});
	} catch (java.lang.NoSuchMethodException e) {
	return false;
	}

	// Make sure superclass is compatible
	Class<?> superClass = javaType.getSuperclass();
	if (superClass != null &&
	superClass != java.lang.Object.class &&
	superClass != java.lang.Exception.class &&
	superClass != java.lang.Throwable.class) {
	if (!isBeanCompatible(superClass)) {
	return false;
	}
	}
	return true;
	}

	/**
	* Process the methods and extract 'attributes', methods, etc
	*
	* @param realClass The class to process
	* @param methods The methods to process
	* @param attMap The attribute map (complete)
	* @param getAttMap The readable attributes map
	* @param setAttMap The settable attributes map
	* @param invokeAttMap The invokable attributes map
	*/
	private void initMethods(Class<?> realClass,
	Method methods[],
	Hashtable<String,Method> attMap,
	Hashtable<String,Method> getAttMap,
	Hashtable<String,Method> setAttMap,
	Hashtable<String,Method> invokeAttMap)
	{
	for (int j = 0; j < methods.length; ++j) {
	String name=methods[j].getName();

	if( Modifier.isStatic(methods[j].getModifiers()))
	continue;
	if( ! Modifier.isPublic( methods[j].getModifiers() ) ) {
	if( log.isDebugEnabled())
	log.debug("Not public " + methods[j] );
	continue;
	}
	if( methods[j].getDeclaringClass() == Object.class )
	continue;
	Class<?> params[] = methods[j].getParameterTypes();

	if( name.startsWith( "get" ) && params.length==0) {
	Class<?> ret = methods[j].getReturnType();
	if( ! supportedType( ret ) ) {
	if( log.isDebugEnabled() )
	log.debug("Unsupported type " + methods[j]);
	continue;
	}
	name=unCapitalize( name.substring(3));

	getAttMap.put( name, methods[j] );
	// just a marker, we don't use the value
	attMap.put( name, methods[j] );
	} else if( name.startsWith( "is" ) && params.length==0) {
	Class<?> ret = methods[j].getReturnType();
	if( Boolean.TYPE != ret ) {
	if( log.isDebugEnabled() )
	log.debug("Unsupported type " + methods[j] + " " + ret );
	continue;
	}
	name=unCapitalize( name.substring(2));

	getAttMap.put( name, methods[j] );
	// just a marker, we don't use the value
	attMap.put( name, methods[j] );

	} else if( name.startsWith( "set" ) && params.length==1) {
	if( ! supportedType( params[0] ) ) {
	if( log.isDebugEnabled() )
	log.debug("Unsupported type " + methods[j] + " " + params[0]);
	continue;
	}
	name=unCapitalize( name.substring(3));
	setAttMap.put( name, methods[j] );
	attMap.put( name, methods[j] );
	} else {
	if( params.length == 0 ) {
	if( specialMethods.get( methods[j].getName() ) != null )
	continue;
	invokeAttMap.put( name, methods[j]);
	} else {
	boolean supported=true;
	for( int i=0; i<params.length; i++ ) {
	if( ! supportedType( params[i])) {
	supported=false;
	break;
	}
	}
	if( supported )
	invokeAttMap.put( name, methods[j]);
	}
	}
	}
	}

	/**
	* XXX Find if the 'className' is the name of the MBean or
	* the real class ( I suppose first )
	* XXX Read (optional) descriptions from a .properties, generated
	* from source
	* XXX Deal with constructors
	*
	* @param registry The Bean registry (not used)
	* @param domain The bean domain (not used)
	* @param realClass The class to analyze
	* @param type The bean type
	* @return ManagedBean The create MBean
	*/
	public ManagedBean createManagedBean(Registry registry, String domain,
	Class<?> realClass, String type)
	{
	ManagedBean mbean= new ManagedBean();

	Method methods[]=null;

	Hashtable<String,Method> attMap = new Hashtable<String,Method>();
	// key: attribute val: getter method
	Hashtable<String,Method> getAttMap = new Hashtable<String,Method>();
	// key: attribute val: setter method
	Hashtable<String,Method> setAttMap = new Hashtable<String,Method>();
	// key: operation val: invoke method
	Hashtable<String,Method> invokeAttMap = new Hashtable<String,Method>();

	methods = realClass.getMethods();

	initMethods(realClass, methods, attMap, getAttMap, setAttMap, invokeAttMap );

	try {

	Enumeration<String> en = attMap.keys();
	while( en.hasMoreElements() ) {
	String name = en.nextElement();
	AttributeInfo ai=new AttributeInfo();
	ai.setName( name );
	Method gm = getAttMap.get(name);
	if( gm!=null ) {
	//ai.setGetMethodObj( gm );
	ai.setGetMethod( gm.getName());
	Class<?> t=gm.getReturnType();
	if( t!=null )
	ai.setType( t.getName() );
	}
	Method sm = setAttMap.get(name);
	if( sm!=null ) {
	//ai.setSetMethodObj(sm);
	Class<?> t = sm.getParameterTypes()[0];
	if( t!=null )
	ai.setType( t.getName());
	ai.setSetMethod( sm.getName());
	}
	ai.setDescription("Introspected attribute " + name);
	if( log.isDebugEnabled()) log.debug("Introspected attribute " +
	name + " " + gm + " " + sm);
	if( gm==null )
	ai.setReadable(false);
	if( sm==null )
	ai.setWriteable(false);
	if( sm!=null \|\| gm!=null )
	mbean.addAttribute(ai);
	}

	en=invokeAttMap.keys();
	while( en.hasMoreElements() ) {
	String name = en.nextElement();
	Method m = invokeAttMap.get(name);
	if( m!=null && name != null ) {
	OperationInfo op=new OperationInfo();
	op.setName(name);
	op.setReturnType(m.getReturnType().getName());
	op.setDescription("Introspected operation " + name);
	Class<?> parms[] = m.getParameterTypes();
	for(int i=0; i<parms.length; i++ ) {
	ParameterInfo pi=new ParameterInfo();
	pi.setType(parms[i].getName());
	pi.setName( "param" + i);
	pi.setDescription("Introspected parameter param" + i);
	op.addParameter(pi);
	}
	mbean.addOperation(op);
	} else {
	log.error("Null arg " + name + " " + m );
	}
	}

	/*Constructor[] constructors = realClass.getConstructors();
	for(int i=0;i<constructors.length;i++) {
	ConstructorInfo info = new ConstructorInfo();
	String className = realClass.getName();
	int nIndex = -1;
	if((nIndex = className.lastIndexOf('.'))!=-1) {
	className = className.substring(nIndex+1);
	}
	info.setName(className);
	info.setDescription(constructors[i].getName());
	Class classes[] = constructors[i].getParameterTypes();
	for(int j=0;j<classes.length;j++) {
	ParameterInfo pi = new ParameterInfo();
	pi.setType(classes[j].getName());
	pi.setName("param" + j);
	pi.setDescription("Introspected parameter param" + j);
	info.addParameter(pi);
	}
	mbean.addConstructor(info);
	}
	*/

	if( log.isDebugEnabled())
	log.debug("Setting name: " + type );
	mbean.setName( type );

	return mbean;
	} catch( Exception ex ) {
	ex.printStackTrace();
	return null;
	}
	}


	// -------------------- Utils --------------------
	/**
	* Converts the first character of the given
	* String into lower-case.
	*
	* @param name The string to convert
	* @return String
	*/
	private static String unCapitalize(String name) {
	if (name == null \|\| name.length() == 0) {
	return name;
	}
	char chars[] = name.toCharArray();
	chars[0] = Character.toLowerCase(chars[0]);
	return new String(chars);
	}

	}

	// End of class: MbeanDescriptorsIntrospectionSource