Bean Utility : Java Beans « Development Class « Java
Bean Utility
/*
* StringUtil.java
*
* Created on May 7, 2004, 7:43 PM
*
* Copyright (C) 2004 Robert Cooper, Temple of the Screaming Penguin
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.beans.*;
import java.lang.reflect.*;
/** This class contains some generic methods for working with String.
* @version $Rev: 87 $
* @author <a href="mailto:cooper@screaming-penguin.com">Robert Cooper</a>
*/
public class BeanUtility {
/** Creates a new instance of StringUtil */
private BeanUtility() { }
/** This method takes a JavaBean and generates a standard toString() type result for it.
* @param o JavaBean object to stringinate
* @return STRINGIATION! Stringingating the countryside. Stringinating all the peasants.
*/
public static String beanToString( Object o ){
StringBuffer result = new StringBuffer();
if(o == null)
return "--- null";
result.append( "--- begin");result.append( o.getClass().getName()); result.append(" hash: ");
result.append( o.hashCode() ); result.append( "\r\n");
try{
PropertyDescriptor[] pds = Introspector.getBeanInfo( o.getClass() ).getPropertyDescriptors();
for( int pdi = 0; pdi < pds.length; pdi ++ ){
try{
result.append( "Property: "+ pds[pdi].getName() + " Value: " + pds[pdi].getReadMethod().invoke( o ) );
} catch( IllegalAccessException iae ){
result.append( "Property: "+ pds[pdi].getName() + " (Illegal Access to Value) ");
}
catch( InvocationTargetException iae ){
result.append( "Property: "+ pds[pdi].getName() + " (InvocationTargetException) " + iae.toString() );
}
catch( Exception e ){
result.append( "Property: "+ pds[pdi].getName() +" (Other Exception )"+e.toString());
}
result.append( "\r\n");
}
} catch( IntrospectionException ie){
result.append( "Introspection Exception: " + ie.toString() ); result.append( "\r\n");
}
result.append( "--- end " ); result.append( o.getClass().getName()); result.append(" hash: ");
result.append( o.hashCode() ); result.append( "\n");
return result.toString();
}
/** This method takes 2 JavaBeans of the same type and copies the properties of one bean to the other.
* Any attempts that have an IllegalAccessException will be ignored. This will also NOT recurse into nested bean
* results. References to existing beanage will be includes. Try using .clone() for that stuff.
* @param from Source Bean
* @param to Desitnation Bean
*/
public static void copyBeanToBean( Object from, Object to ) throws InvocationTargetException, IntrospectionException{
PropertyDescriptor[] pds = Introspector.getBeanInfo( from.getClass() ).getPropertyDescriptors();
for( int i=0; i < pds.length; i++){
try{
if(pds[i].getName().equals("class")) continue;
Object[] value = {pds[i].getReadMethod().invoke(from) };
pds[i].getWriteMethod().invoke( to, value ) ;
} catch( IllegalAccessException iae ){
//Im just going to ignore any properties I don't have access too.
}
}
}
public static String[] getPropertyNames(Object o) throws IntrospectionException {
PropertyDescriptor[] pds = Introspector.getBeanInfo( o.getClass() ).getPropertyDescriptors();
String[] propertyNames = new String[ pds.length];
for( int i=0; i< pds.length; i++){
propertyNames[i] = pds[i].getName();
}
return propertyNames;
}
public static Object getProperty( Object o, String propertyName ) throws Exception {
PropertyDescriptor[] pds = Introspector.getBeanInfo( o.getClass() ).getPropertyDescriptors();
for( int i=0; i< pds.length; i++){
if( pds[i].getName().equals(propertyName)){
return pds[i].getReadMethod().invoke( o ) ;
}
}
throw new Exception("Property not found.");
}
public static void setProperty( Object o, String propertyName, Object value ) throws Exception{
PropertyDescriptor[] pds = Introspector.getBeanInfo( o.getClass() ).getPropertyDescriptors();
for( int i=0; i< pds.length; i++){
if( pds[i].getName().equals(propertyName)){
pds[i].getWriteMethod().invoke( o, value );
return;
}
}
throw new Exception("Property not found.");
}
public static Class getPropertyType( Object o, String propertyName ) throws Exception{
PropertyDescriptor[] pds = Introspector.getBeanInfo( o.getClass() ).getPropertyDescriptors();
for( int i=0; i< pds.length; i++){
if( pds[i].getName().equals(propertyName)){
return pds[i].getPropertyType();
}
}
throw new Exception("Property not found.");
}
}
