/*
* Copyright 2009 Alin Dreghiciu.
*
* Licensed 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.ops4j.pax.swissbox.converter.java.io;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import org.osgi.service.blueprint.container.Converter;
import org.osgi.service.blueprint.container.ReifiedType;
import static org.ops4j.pax.swissbox.converter.internal.Primitives.*;
import static org.ops4j.pax.swissbox.converter.java.lang.AssignableConverter.*;
import static org.ops4j.pax.swissbox.converter.java.lang.FromNullConverter.*;
/**
* JAVADOC
*
* @author Alin Dreghiciu (adreghiciu@gmail.com)
*/
public class ToOutputStreamConverter
implements Converter
{
public static final ToOutputStreamConverter INSTANCE = new ToOutputStreamConverter();
private final Converter escape;
public ToOutputStreamConverter()
{
this.escape = null;
}
public ToOutputStreamConverter( final Converter escape )
{
this.escape = escape;
}
public boolean canConvert( final Object sourceObject,
final ReifiedType targetType )
{
return fromNullConverter().canConvert( sourceObject, targetType )
|| assignableConverter().canConvert( sourceObject, targetType )
|| ( OutputStream.class.isAssignableFrom( unwrap( targetType.getRawClass() ) )
&& ( sourceObject instanceof File
|| sourceObject instanceof CharSequence
|| ( escape != null
&& escape.canConvert( sourceObject, new ReifiedType( File.class ) ) ) ) );
}
public Object convert( final Object sourceObject,
final ReifiedType targetType )
throws Exception
{
if( !canConvert( sourceObject, targetType ) )
{
throw new Exception(
String.format(
"%s cannot convert an %s", ToOutputStreamConverter.class.getSimpleName(), sourceObject.getClass()
)
);
}
if( fromNullConverter().canConvert( sourceObject, targetType ) )
{
return fromNullConverter().convert( sourceObject, targetType );
}
if( assignableConverter().canConvert( sourceObject, targetType ) )
{
return assignableConverter().convert( sourceObject, targetType );
}
return convertToOutputStream( sourceObject, targetType );
}
public OutputStream convertToOutputStream( final Object sourceObject,
final ReifiedType targetType )
throws Exception
{
if( sourceObject instanceof File )
{
return new FileOutputStream( (File) sourceObject );
}
if( sourceObject instanceof CharSequence )
{
return new FileOutputStream( sourceObject.toString() );
}
if( escape != null )
{
if( escape.canConvert( sourceObject, new ReifiedType( File.class ) ) )
{
try
{
return new FileOutputStream( (File) escape.convert( sourceObject, new ReifiedType( File.class ) ) );
}
catch( Exception ignore )
{
// ignore
}
}
}
throw new Exception( String.format( "Unable to convert number %s to %s", sourceObject, targetType ) );
}
public static ToOutputStreamConverter toOutputStreamConverter()
{
return INSTANCE;
}
public static ToOutputStreamConverter toOutputStreamConverter( final Converter escape )
{
return new ToOutputStreamConverter( escape );
}
}