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Posted to dev@commons.apache.org by rd...@apache.org on 2003/07/31 23:38:31 UTC
cvs commit: jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/strategy DefaultObjectStringConverter.java
rdonkin 2003/07/31 14:38:31
Added: betwixt/src/java/org/apache/commons/betwixt/strategy
DefaultObjectStringConverter.java
Log:
Implementation of object <-> String conversion strategy
Revision Changes Path
1.1 jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/strategy/DefaultObjectStringConverter.java
Index: DefaultObjectStringConverter.java
===================================================================
/*
* $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/strategy/DefaultObjectStringConverter.java,v 1.1 2003/07/31 21:38:31 rdonkin Exp $
* $Revision: 1.1 $
* $Date: 2003/07/31 21:38:31 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: DefaultObjectStringConverter.java,v 1.1 2003/07/31 21:38:31 rdonkin Exp $
*/
package org.apache.commons.betwixt.strategy;
import java.text.SimpleDateFormat;
import java.text.ParseException;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.betwixt.expression.Context;
/**
* <p>Default string <-> object conversion strategy.</p>
* <p>
* This delegates to ConvertUtils except when the type is assignable from <code>java.util.Date</code>
* but not from <code>java.sql.Date</code>.
* In this case, the format used is (in SimpleDateFormat terms) <code>EEE MMM dd HH:mm:ss zzz yyyy</code>.
* This is the same as the output of the toString method on java.util.Date.
* </p>
* <p>
* This should preserve the existing symantic behaviour whilst allowing round tripping of dates
* (given the default settings).
* </p>
*/
public class DefaultObjectStringConverter extends ConvertUtilsObjectStringConverter {
/** Formats Dates to Strings and Strings to Dates */
private final static SimpleDateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");
/**
* Converts an object to a string representation using ConvertUtils.
* If the object is a java.util.Date and the type is java.util.Date but not java.sql.Date
* then SimpleDateFormat formatting to <code>EEE MMM dd HH:mm:ss zzz yyyy</code>
* will be used.
* (This is the same as java.util.Date toString would return.)
*
* @param object the object to be converted, possibly null
* @param type the property class of the object, not null
* @param flavour a string allow symantic differences in formatting to be communicated (ignored)
* @return a String representation, not null
*/
public String objectToString(Object object, Class type, String flavour, Context context) {
if ( object != null ) {
if ( object instanceof java.util.Date && isUtilDate( type ) ) {
return formatter.format( (java.util.Date) object );
} else {
// use ConvertUtils implementation
return super.objectToString( object, type, flavour, context );
}
}
return "";
}
/**
* Converts an object to a string representation using ConvertUtils.
*
* @param value the String to be converted, not null
* @param the property class to be returned (if possible), not null
* @param flavour a string allow symantic differences in formatting to be communicated (ignored)
* @return an Object converted from the String, not null
*/
public Object stringToObject(String value, Class type, String flavour, Context context) {
if ( isUtilDate( type ) ) {
try
{
return formatter.parse( value );
}
catch ( ParseException ex )
{
handleException( ex );
// this supports any subclasses that do not which to throw exceptions
// probably will result in a problem when the method will be invoked
// but never mind
return value;
}
} else {
// use ConvertUtils implementation
return super.stringToObject( value, type, flavour, context );
}
}
/**
* Allow subclasses to use a different exception handling strategy.
* This class throws a <code>org.apache.commons.beanutils.ConversionException</code>
* when conversion fails.
* @param e the Exception to be handled
* @throws org.apache.commons.beanutils.ConversionException when conversion fails
*/
protected void handleException(Exception e) {
throw new ConversionException( "String to object conversion failed: " + e.getMessage(), e );
}
/**
* Is the given type a java.util.Date but not a java.sql.Date.
*/
private boolean isUtilDate(Class type) {
return ( java.util.Date.class.isAssignableFrom(type)
&& !java.sql.Date.class.isAssignableFrom(type)
&& !java.sql.Time.class.isAssignableFrom(type)
&& !java.sql.Timestamp.class.isAssignableFrom(type) );
}
}
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