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CSV manipulation library.
/*
* #%L
* Nerd4j CSV
* %%
* Copyright (C) 2013 Nerd4j
* %%
* This program 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 3 of the
* License, or (at your option) any later version.
*
* This program 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
package org.nerd4j.csv.reader.binding;
import java.lang.reflect.Method;
import org.nerd4j.csv.exception.CSVToModelBindingException;
import org.nerd4j.csv.field.CSVFieldMetadata;
import org.nerd4j.util.ReflectionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents a Factory able to build and configure
* {@link CSVToModelBinder}s which populates data objects (beans)
* using the fields of a related CSV record.
*
* @param type of the data bean to build.
*
* @author Nerd4j Team
*/
public final class CSVToBeanBinderFactory extends AbstractCSVToModelBinderFactory
{
/** Internal logging system. */
private static final Logger logger = LoggerFactory.getLogger( CSVToBeanBinderFactory.class );
/** The {@link Class} representing the data bean. */
private Class beanClass;
/**
* Constructor with parameters.
*
* @param beanClass the type of the data bean.
*/
public CSVToBeanBinderFactory( final Class beanClass )
throws CSVToModelBindingException
{
super( Method.class );
if( beanClass == null )
throw new CSVToModelBindingException( "The bean type is mandatory" );
this.beanClass = beanClass;
}
/* ***************** */
/* EXTENSION HOOKS */
/* ***************** */
/**
* {@inheritDoc}
*/
@Override
protected Method getMapping( final String mappingDescriptor )
{
return ReflectionUtil.findPublicSetter( mappingDescriptor, beanClass );
}
/**
* {@inheritDoc}
*/
@Override
protected CSVToModelBinder getBinder( final CSVFieldMetadata[] fieldConfs, final Method[] fieldMapping )
{
return new CSVToBeanBinder( fieldMapping );
}
/* *************** */
/* INNER CLASSES */
/* *************** */
/**
* Represents an implementation of {@link CSVToModelBinder} that
* uses an array of {@link String}s as CSV record model.
*
* @author Nerd4j Team
*/
private class CSVToBeanBinder implements CSVToModelBinder
{
/** The internal instance of the data model. */
private B model;
/**
* This array is intended to contain a mapping that associates
* each input column index into the related output bean property.
*/
private final Method[] columnMapping;
/**
* Constructor with parameters.
*
* @param columnMapping mapping of the columns.
*/
public CSVToBeanBinder( final Method[] columnMapping )
{
super();
this.model = null;
this.columnMapping = columnMapping;
}
/* ******************* */
/* INTERFACE METHODS */
/* ******************* */
/**
* {@inheritDoc}
*/
@Override
public void initModel() throws CSVToModelBindingException
{
try{
logger.debug( "Creating new bean of type {}.", beanClass );
this.model = beanClass.newInstance();
}catch( Exception ex )
{
logger.error( "Unable to instantiate bean of type " + beanClass, ex );
throw new CSVToModelBindingException( ex );
}
}
/**
* {@inheritDoc}
*/
@Override
public void fill( int column, Object value ) throws CSVToModelBindingException
{
final Method setter = column < columnMapping.length
? columnMapping[column]
: null;
try{
if( setter != null )
{
if( logger.isDebugEnabled() )
logger.debug( "Setting value {} for column {} using method {}.", value, column, setter.getName() );
setter.invoke( model, value );
}
else
{
if( logger.isTraceEnabled() )
logger.trace( "There is no valid setter for column {} unable to fill value.", column );
}
}catch( NullPointerException ex )
{
logger.error( "Try to invoke a method on a null object, the model needs to be initialized before filling.", ex );
throw new CSVToModelBindingException( "Try to fill a model without initialization", ex );
}catch( Exception ex )
{
logger.error( "Unable to invoke method " + setter, ex );
throw new CSVToModelBindingException( ex );
}
}
/**
* {@inheritDoc}
*/
@Override
public B getModel()
{
return model;
}
}
}
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