com.mchange.v2.beans.swing.PropertyComponentBindingUtility Maven / Gradle / Ivy
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Show all versions of guiced-persistence-c3p0 Show documentation
Enables C3P0 with Hibernate connections in the GuicedPersistence provider
Requires JDK 8 and up
/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.beans.swing;
import java.beans.*;
import java.lang.reflect.*;
import javax.swing.SwingUtilities;
import com.mchange.v2.beans.BeansUtils;
/**
* This class ASSUMES the property at issue is a JavaBeans-bound property.
* It does NOT rely on the introspector to verify this, on the theory that
* often programmers fail to provide accurate BeanInfo classes.
*/
class PropertyComponentBindingUtility
{
final static Object[] EMPTY_ARGS = {};
HostBindingInterface hbi;
Object bean;
PropertyDescriptor pd = null;
EventSetDescriptor propChangeEsd = null;
Method addMethod = null;
Method removeMethod = null;
Method propGetter = null;
Method propSetter = null;
PropertyEditor propEditor = null;
Object nullReplacement = null;
PropertyComponentBindingUtility(final HostBindingInterface hbi, Object bean, final String propName, boolean requirePropEditor)
throws IntrospectionException
{
this.hbi = hbi;
this.bean = bean;
BeanInfo beanInfo = Introspector.getBeanInfo( bean.getClass() );
PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
for( int i = 0, len = pds.length; i < len; ++i)
{
PropertyDescriptor checkPd = pds[i];
if (propName.equals( checkPd.getName() ) )
{
this.pd = checkPd;
break;
}
}
if (pd == null)
throw new IntrospectionException("Cannot find property on bean Object with name '" + propName + "'.");
EventSetDescriptor[] esds = beanInfo.getEventSetDescriptors();
for( int i = 0, len = esds.length; i < len; ++i)
{
EventSetDescriptor checkEsd = esds[i];
if ("propertyChange".equals( checkEsd.getName() ) )
{
this.propChangeEsd = checkEsd;
break;
}
}
if (propChangeEsd == null)
throw new IntrospectionException("Cannot find PropertyChangeEvent on bean Object with name '" + propName + "'.");
propEditor = BeansUtils.findPropertyEditor( pd );
if (requirePropEditor && propEditor == null)
throw new IntrospectionException("Could not find an appropriate PropertyEditor for property: " + propName);
//System.err.println( "propEditor -> " + propEditor );
propGetter = pd.getReadMethod();
propSetter = pd.getWriteMethod();
if (propGetter == null || propSetter == null)
throw new IntrospectionException("The specified property '" + propName + "' must be both readdable and writable, but it is not!");
Class propType = pd.getPropertyType();
if (propType.isPrimitive())
{
if (propType == boolean.class)
this.nullReplacement = Boolean.FALSE;
if (propType == byte.class)
this.nullReplacement = new Byte( (byte) 0 );
else if (propType == char.class)
this.nullReplacement = new Character( (char) 0 );
else if (propType == short.class)
this.nullReplacement = new Short( (short) 0 );
else if (propType == int.class)
this.nullReplacement = new Integer( 0 );
else if (propType == long.class)
this.nullReplacement = new Long( 0 );
else if (propType == float.class)
this.nullReplacement = new Float( 0 );
else if (propType == double.class)
this.nullReplacement = new Double( 0 );
else
throw new InternalError("What kind of primitive is " + propType.getName() + "???");
}
addMethod = propChangeEsd.getAddListenerMethod();
removeMethod = propChangeEsd.getAddListenerMethod();
PropertyChangeListener pcl = new PropertyChangeListener()
{
public void propertyChange( PropertyChangeEvent evt )
{
String chkPropName = evt.getPropertyName();
if (chkPropName.equals( propName ))
{ hbi.syncToValue( propEditor, evt.getNewValue()); }
}
};
try
{ addMethod.invoke( bean, new Object[]{ pcl } ); }
catch ( Exception e )
{
e.printStackTrace();
throw new IntrospectionException("The introspected PropertyChangeEvent adding method failed with an Exception.");
}
hbi.addUserModificationListeners();
}
public void userModification()
{
Object oldValue = null;
try
{ oldValue = propGetter.invoke( bean, EMPTY_ARGS ); }
catch (Exception e)
{ e.printStackTrace(); }
try
{
Object newValue = hbi.fetchUserModification( propEditor, oldValue );
if (newValue == null)
newValue = nullReplacement;
propSetter.invoke( bean, new Object[] { newValue } );
}
catch (Exception e)
{
if (! (e instanceof PropertyVetoException))
e.printStackTrace();
syncComponentToValue( true );
}
}
public void resync()
{ syncComponentToValue( false ); }
private void syncComponentToValue( final boolean alert_error )
{
try
{
final Object reversionValue = propGetter.invoke( bean, EMPTY_ARGS );
Runnable task = new Runnable()
{
public void run()
{
if (alert_error)
hbi.alertErroneousInput();
hbi.syncToValue( propEditor , reversionValue );
}
};
SwingUtilities.invokeLater( task );
}
catch (Exception e)
{
e.printStackTrace();
}
}
}